Rickard Bolin | bc6ee58 | 2022-11-04 08:24:29 +0000 | [diff] [blame^] | 1 | # SPDX-FileCopyrightText: Copyright 2020-2022 Arm Limited and/or its affiliates <open-source-office@arm.com> |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 2 | # |
| 3 | # SPDX-License-Identifier: Apache-2.0 |
| 4 | # |
| 5 | # Licensed under the Apache License, Version 2.0 (the License); you may |
| 6 | # not use this file except in compliance with the License. |
| 7 | # You may obtain a copy of the License at |
| 8 | # |
| 9 | # www.apache.org/licenses/LICENSE-2.0 |
| 10 | # |
| 11 | # Unless required by applicable law or agreed to in writing, software |
| 12 | # distributed under the License is distributed on an AS IS BASIS, WITHOUT |
| 13 | # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | # See the License for the specific language governing permissions and |
| 15 | # limitations under the License. |
Rickard Bolin | bc6ee58 | 2022-11-04 08:24:29 +0000 | [diff] [blame^] | 16 | # |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 17 | # Description: |
| 18 | # Early optimisation of a TensorFlow Lite based network graph, using the rewrite_graph module |
| 19 | # to do the traversal of the graph. |
| 20 | import math |
| 21 | import uuid |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 22 | |
| 23 | import numpy as np |
| 24 | |
| 25 | from . import fp_math |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 26 | from . import rewrite_graph |
| 27 | from . import scaling |
| 28 | from .api import NpuRoundingMode |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 29 | from .data_type import BaseType |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 30 | from .data_type import DataType |
| 31 | from .debug_database import DebugDatabase |
| 32 | from .errors import UnsupportedFeatureError |
| 33 | from .ethos_u55_regs.ethos_u55_regs import resampling_mode |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 34 | from .graph_optimiser_util import bypass_memory_only_ops |
Patrik Gustavsson | c74682c | 2021-08-17 14:26:38 +0200 | [diff] [blame] | 35 | from .graph_optimiser_util import calc_explicit_padding |
Patrik Gustavsson | df99510 | 2021-08-23 15:33:59 +0200 | [diff] [blame] | 36 | from .graph_optimiser_util import convert_depthwise_to_conv |
Patrik Gustavsson | f436ada | 2021-09-14 14:56:48 +0200 | [diff] [blame] | 37 | from .graph_optimiser_util import convert_to_lut |
Patrik Gustavsson | df99510 | 2021-08-23 15:33:59 +0200 | [diff] [blame] | 38 | from .graph_optimiser_util import fix_sg_input_output |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 39 | from .graph_optimiser_util import memory_only_ops |
Patrik Gustavsson | f1580f0 | 2021-09-01 12:43:02 +0200 | [diff] [blame] | 40 | from .graph_optimiser_util import move_splitsliceread_to_consumer |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 41 | from .graph_optimiser_util import needed_total_padding |
| 42 | from .graph_optimiser_util import set_ifm_ofm_op_shapes |
| 43 | from .graph_optimiser_util import set_tensor_equivalence |
| 44 | from .numeric_util import clamp_sigmoid |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 45 | from .numeric_util import round_away_zero |
| 46 | from .operation import create_activation_function |
Fredrik Svedberg | 1a7527c | 2021-09-13 15:52:16 +0200 | [diff] [blame] | 47 | from .operation import ExplicitScaling |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 48 | from .operation import NpuBlockType |
| 49 | from .operation import Op |
| 50 | from .operation import Operation |
| 51 | from .operation import Padding |
Fredrik Svedberg | f3c7d55 | 2022-11-04 09:48:49 +0100 | [diff] [blame] | 52 | from .operation_util import create_add_nop |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 53 | from .operation_util import create_avgpool_nop |
| 54 | from .operation_util import get_pad_values_from_input |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 55 | from .scaling import quantise_scale |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 56 | from .shape4d import Shape4D |
| 57 | from .softmax import SoftMax |
| 58 | from .tensor import check_quantized_tens_scaling_equal |
| 59 | from .tensor import create_const_tensor |
| 60 | from .tensor import create_equivalence_id |
| 61 | from .tensor import QuantizationParameters |
| 62 | from .tensor import Tensor |
| 63 | from .tensor import TensorPurpose |
| 64 | from .tflite_mapping import optype_to_builtintype |
| 65 | |
| 66 | passthrough_nodes = (Op.Identity,) |
| 67 | |
| 68 | |
| 69 | def create_avg_pool_for_concat(concat_op, name, ifm, ifm_shape: Shape4D, write_offset: Shape4D): |
| 70 | """Creates an average pool for the given concat op/input feature map""" |
| 71 | ofm = concat_op.ofm |
| 72 | avgpool_op = create_avgpool_nop(name) |
| 73 | avgpool_op.inputs = [ifm] |
| 74 | avgpool_op.outputs = [ofm] |
| 75 | |
| 76 | avgpool_op.write_offset = write_offset |
| 77 | avgpool_op.write_shape = ifm_shape |
| 78 | ofm.ops.append(avgpool_op) |
| 79 | DebugDatabase.add_optimised(concat_op, avgpool_op) |
| 80 | avgpool_op.ifm_shapes.append(ifm_shape) |
| 81 | avgpool_op.ofm_shapes.append(concat_op.ofm_shapes[0]) |
| 82 | avgpool_op.memory_function = Op.ConcatSliceWrite |
| 83 | return avgpool_op |
| 84 | |
| 85 | |
| 86 | def remove_passthrough_tensor(tens, arch, nng): |
| 87 | if len(tens.ops) == 1 and tens.ops[0].type in passthrough_nodes: |
| 88 | assert len(tens.ops[0].inputs) == 1 |
| 89 | tens = tens.ops[0].inputs[0] |
| 90 | return tens |
| 91 | |
| 92 | |
| 93 | def rewrite_concat_ops(op, arch): |
| 94 | if not op.run_on_npu or not op.type.is_concat_op(): |
| 95 | return |
| 96 | |
| 97 | axis_4D = 0 |
| 98 | ofm = op.ofm |
| 99 | ofm.ops = [] |
| 100 | offset = 0 |
| 101 | |
| 102 | unfuse_activation_function(op) |
| 103 | |
| 104 | if op.type == Op.Pack: |
| 105 | # Pack is also referred to as Stack |
| 106 | axis = int(op.attrs["axis"]) |
| 107 | if axis < 0: # Convert to positive axis |
| 108 | axis = len(op.inputs[0].shape) + 1 + axis |
| 109 | |
| 110 | desired_shape = op.inputs[0].shape[:axis] + [1] + op.inputs[0].shape[axis:] |
| 111 | |
| 112 | axis_4D = axis + (4 - len(desired_shape)) |
| 113 | |
| 114 | for idx, inp in enumerate(op.inputs): |
| 115 | op.ifm_shapes[idx] = Shape4D(desired_shape) |
| 116 | op.type = Op.PackReshaped |
| 117 | |
| 118 | inputs, axis = op.get_concat_inputs_axis() |
| 119 | for idx, inp in enumerate(inputs): |
| 120 | if op.type != Op.PackReshaped: |
| 121 | op.ifm_shapes[idx] = Shape4D(inp.shape) |
| 122 | if axis >= 0: |
| 123 | axis_4D = axis + (4 - len(inp.shape)) |
| 124 | else: |
| 125 | axis_4D = axis |
| 126 | write_offset = [0, 0, 0, 0] |
| 127 | write_offset[axis_4D] = offset |
| 128 | concat_end = offset + op.ifm_shapes[idx][axis_4D] |
| 129 | create_avg_pool_for_concat( |
| 130 | op, op.name + str(idx) + "_avgpool", inp, op.ifm_shapes[idx], Shape4D.from_list(write_offset) |
| 131 | ) |
| 132 | offset = concat_end |
| 133 | assert ofm.shape[axis] == offset |
| 134 | |
| 135 | return op |
| 136 | |
| 137 | |
| 138 | def rewrite_split_ops(tens, arch, nng): |
| 139 | |
| 140 | if len(tens.ops) == 1 and tens.ops[0].type.is_split_op() and tens.ops[0].type != Op.Unpack: |
| 141 | split_op = tens.ops[0] |
| 142 | |
| 143 | # Not supported so leave it and run on CPU |
| 144 | if not split_op.run_on_npu: |
| 145 | return tens |
| 146 | |
| 147 | inp, outputs, axis, offset_start, offset_end = split_op.get_split_inputs_axis() |
| 148 | |
| 149 | tens.ops = [] |
| 150 | new_op = Operation(Op.SplitSliceRead, split_op.name) |
| 151 | new_op.inputs = [inp] |
| 152 | ofm_shape_idx = 0 |
Tim Hall | 51a8dce | 2021-12-20 16:49:27 +0000 | [diff] [blame] | 153 | if None in (offset_end, offset_start): |
| 154 | read_shape = None |
| 155 | else: |
| 156 | # the read shape is relative to each start offset |
| 157 | read_shape = [oe - os for oe, os in zip(offset_end, offset_start)] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 158 | |
| 159 | # For Split the offset cannot be extracted from the tensor so it has to |
| 160 | # be calculated from the index of the output tensor |
| 161 | if axis is not None: |
| 162 | # Get the start and end of the split |
| 163 | offset_start = [0] * 4 |
| 164 | axis_4D_list = split_op.attrs.get("split_axis_4D", None) # Present for UnpackReshaped and some StridedSlice |
| 165 | for idx, out in enumerate(outputs): |
| 166 | if axis_4D_list is not None: |
| 167 | axis_4D = axis_4D_list[idx] |
| 168 | else: |
| 169 | split_op.ofm_shapes[idx] = Shape4D(out.shape) |
| 170 | if axis >= 0: |
| 171 | axis_4D = axis + (4 - len(out.shape)) |
| 172 | else: |
| 173 | axis_4D = axis |
| 174 | |
| 175 | if out == tens: |
| 176 | ofm_shape_idx = idx |
| 177 | read_shape = split_op.ofm_shapes[idx] |
| 178 | break |
| 179 | |
| 180 | offset_start[axis_4D] += split_op.ofm_shapes[idx][axis_4D] |
| 181 | |
| 182 | new_op.read_offsets[0] = Shape4D.from_list(offset_start, 0) |
| 183 | new_op.read_shapes[0] = read_shape |
| 184 | new_op.run_on_npu = True |
| 185 | new_op.set_output_tensor(tens) |
| 186 | new_op.ifm_shapes.append(Shape4D(inp.shape)) |
| 187 | new_op.ofm_shapes.append(split_op.ofm_shapes[ofm_shape_idx]) |
| 188 | DebugDatabase.add_optimised(split_op, new_op) |
| 189 | |
| 190 | return tens |
| 191 | |
| 192 | |
| 193 | def remove_SplitSliceRead(op, arch): |
| 194 | |
| 195 | if op.type == Op.SplitSliceRead: |
| 196 | # Check if it is possible to put the SplitSliceRead on the tensor consumer, or if an avgpool need to be inserted |
| 197 | if ( |
| 198 | len(op.ofm.consumer_list) == 1 |
| 199 | and op.ofm.consumer_list[0] is not None |
| 200 | and op.ofm.consumer_list[0].run_on_npu |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 201 | and op.ofm.consumer_list[0].type not in memory_only_ops |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 202 | and op.ofm_shapes[0] == Shape4D.from_list(op.ofm.shape) |
| 203 | ): |
| 204 | # SplitSliceRead can be performed by tensor consumer |
| 205 | cons_op = op.ofm.consumer_list[0] |
Patrik Gustavsson | f1580f0 | 2021-09-01 12:43:02 +0200 | [diff] [blame] | 206 | move_splitsliceread_to_consumer(op, cons_op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 207 | else: |
| 208 | avgpool_op = create_avgpool_nop(op.name + "_avgpool") |
| 209 | avgpool_op.add_input_tensor(op.ifm) |
| 210 | avgpool_op.outputs = [op.ofm] |
| 211 | op.ofm.ops.remove(op) |
| 212 | op.ofm.ops.append(avgpool_op) |
| 213 | avgpool_op.ifm_shapes.append(op.ifm_shapes[0]) |
| 214 | avgpool_op.ofm_shapes.append(op.ofm_shapes[0]) |
| 215 | avgpool_op.read_offsets[0] = op.read_offsets[0] |
| 216 | avgpool_op.read_shapes[0] = op.read_shapes[0] |
| 217 | |
| 218 | op.ifm.consumer_list.remove(op) |
| 219 | DebugDatabase.add_optimised(op, avgpool_op) |
| 220 | |
| 221 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 222 | def calc_padding_and_skirt(padding_type, kernel, input_shape, explicit_padding): |
| 223 | k_w, k_h = kernel.dilated_wh() |
| 224 | s_x, s_y = kernel.stride |
| 225 | ypad = needed_total_padding(int(input_shape.height), int(s_y), int(k_h)) |
| 226 | xpad = needed_total_padding(int(input_shape.width), int(s_x), int(k_w)) |
| 227 | if padding_type == Padding.SAME: |
| 228 | left_pad = (xpad + 0) // 2 |
| 229 | right_pad = (xpad + 1) // 2 |
| 230 | top_pad = (ypad + 0) // 2 |
| 231 | bottom_pad = (ypad + 1) // 2 |
| 232 | elif padding_type == Padding.VALID: |
| 233 | left_pad = 0 |
| 234 | right_pad = 0 |
| 235 | top_pad = 0 |
| 236 | bottom_pad = 0 |
| 237 | elif padding_type == Padding.EXPLICIT: |
| 238 | # Padding is specified in a PAD operator which has been bypassed. |
| 239 | top, left, bottom, right = explicit_padding |
| 240 | top_pad, bottom_pad = calc_explicit_padding(int(input_shape.height), int(s_y), int(k_h), int(top), int(bottom)) |
| 241 | left_pad, right_pad = calc_explicit_padding(int(input_shape.width), int(s_x), int(k_w), int(left), int(right)) |
Rickard Bolin | 9ae3455 | 2022-06-09 13:07:17 +0000 | [diff] [blame] | 242 | elif padding_type == Padding.TILE: |
| 243 | # The values in the explicit padding only represent the "direction" in which to pad |
| 244 | top_pad, left_pad, bottom_pad, right_pad = explicit_padding |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 245 | else: |
Tim Hall | 0ab2edc | 2022-02-23 17:58:02 +0000 | [diff] [blame] | 246 | raise UnsupportedFeatureError(f"Unsupported padding = {padding_type} for padding calculation") |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 247 | padding = (top_pad, left_pad, bottom_pad, right_pad) |
| 248 | skirt = (top_pad, left_pad, ypad - top_pad, xpad - left_pad) |
| 249 | return padding, skirt |
| 250 | |
| 251 | |
| 252 | def calc_upscaled_padding_and_skirt(padding_type, kernel_size, stride, input_shape, upscaling_factor): |
| 253 | kernel_height, kernel_width = kernel_size[0], kernel_size[1] |
| 254 | if padding_type == Padding.SAME: |
| 255 | ypad = needed_total_padding(int(input_shape.height) * upscaling_factor, int(stride[1]), int(kernel_height)) |
| 256 | xpad = needed_total_padding(int(input_shape.width) * upscaling_factor, int(stride[2]), int(kernel_width)) |
| 257 | right_pad = max(((xpad + 1) // upscaling_factor) - 1, 0) |
| 258 | bottom_pad = max(((ypad + 1) // upscaling_factor) - 1, 0) |
| 259 | left_pad = max(kernel_width - 1 - right_pad, 0) |
| 260 | top_pad = max(kernel_height - 1 - bottom_pad, 0) |
| 261 | elif padding_type == Padding.VALID: |
| 262 | right_pad = max(kernel_width - 2, 0) |
| 263 | bottom_pad = max(kernel_height - 2, 0) |
| 264 | left_pad = kernel_width - 1 |
| 265 | top_pad = kernel_height - 1 |
| 266 | else: |
Tim Hall | 0ab2edc | 2022-02-23 17:58:02 +0000 | [diff] [blame] | 267 | raise UnsupportedFeatureError(f"Unsupported padding = {padding_type} for up-scaled padding calculation") |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 268 | padding = (top_pad, left_pad, bottom_pad, right_pad) |
| 269 | skirt = padding |
| 270 | return padding, skirt |
| 271 | |
| 272 | |
| 273 | def fixup_conv2d_backprop(op, arch, nng): |
| 274 | if op.type == Op.Conv2DBackpropInput: |
| 275 | # flip the inputs |
| 276 | op.inputs[0], op.inputs[2] = op.inputs[2], op.inputs[0] |
| 277 | op.type = Op.Conv2DBackpropInputSwitchedBias |
Tim Hall | 3c5cfe9 | 2022-03-16 16:31:57 +0000 | [diff] [blame] | 278 | op.ifm_resampling_mode = resampling_mode.TRANSPOSE |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 279 | |
| 280 | # Update strides |
| 281 | op.attrs.update({"stride_w": 1, "stride_h": 1, "strides": (1, 1, 1, 1)}) |
| 282 | |
| 283 | return op |
| 284 | |
| 285 | |
| 286 | # Convert the op to an elementwise add |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 287 | def convert_resize_1x1_to_add(op): |
| 288 | op.type = Op.Add # original_type will stay as Op.ResizeBilinear or Op.ResizeNearestNeighbor |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 289 | op.name = op.name + "_add" |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 290 | # Create an input tensor filled with zeros |
| 291 | shape = op.ofm_shapes[0].as_list() |
| 292 | tens = Tensor(shape, op.inputs[0].dtype, op.inputs[1].name + "_add") |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 293 | tens.values = np.zeros(shape, tens.dtype.as_numpy_type()) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 294 | tens.quantization = QuantizationParameters(0.0, 255.0) |
| 295 | tens.quantization.scale_f32 = 1.0 |
| 296 | tens.quantization.zero_point = 0 |
| 297 | tens.consumer_list = [op] |
| 298 | tens_op = op.inputs[1].ops[0] |
| 299 | tens_op.set_output_tensor(tens) |
| 300 | # Set the add inputs |
| 301 | op.inputs[1] = op.inputs[0] |
| 302 | op.inputs[0] = tens |
| 303 | op.set_ifm_ofm_shapes() |
| 304 | |
| 305 | return op |
| 306 | |
| 307 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 308 | # Convert ResizeNearestNeightbor with align corners to a depthwise convolution. The IFM will already have been upscaled |
| 309 | # apart from the final x2 scaling which will be done as part of this operation. The kernel contains a single coefficient |
| 310 | # to select the appropriate nearest neighbor value |
| 311 | def convert_resizenn_ac_to_depthwise_conv(op, upscale_factor): |
| 312 | ifm = op.ifm |
| 313 | ofm = op.ofm |
| 314 | output_depth = ofm.shape[-1] |
| 315 | dw_op_attrs = { |
| 316 | "padding": Padding.VALID, |
| 317 | "stride_h": 1, |
| 318 | "stride_w": 1, |
| 319 | "strides": (1, 1, 1, 1), |
| 320 | "depth_multiplier": 1, |
| 321 | "channel_multiplier": 1, |
| 322 | "dilation_h_factor": 1, |
| 323 | "dilation_w_factor": 1, |
| 324 | "dilation": (1, 1, 1, 1), |
| 325 | } |
| 326 | |
| 327 | # change resizebilinear to depthwise |
| 328 | op.type = Op.DepthwiseConv2DBias |
| 329 | op.attrs.update(dw_op_attrs) |
| 330 | op.set_input_tensor(ifm, 0) # ifm tensor index |
| 331 | op.activation = None |
| 332 | |
| 333 | # add input resample to resize by x2 |
| 334 | op.ifm_resampling_mode = resampling_mode.NEAREST |
| 335 | |
| 336 | # don't care about the rounding mode as it is nearest neighbor |
| 337 | |
| 338 | # setup weight tensor |
| 339 | weight_quant = QuantizationParameters() |
| 340 | weight_quant.scale_f32 = 1.0 # no scaling as only a single non-zero coeff to select the desired value |
| 341 | weight_quant.zero_point = 0 |
| 342 | weight_quant.quant_dim = 0 |
| 343 | ofm_dtype = ofm.dtype |
| 344 | if ofm_dtype == DataType.uint8: |
| 345 | weight_value_dtype = np.uint8 |
| 346 | weight_quant.quant_min = 0 |
| 347 | weight_quant.quant_max = (1 << ofm_dtype.bits) - 1 |
| 348 | else: |
| 349 | if ofm_dtype == DataType.int8: |
| 350 | weight_value_dtype = np.int8 |
| 351 | else: |
| 352 | assert ofm_dtype == DataType.int16 |
| 353 | weight_value_dtype = np.int16 |
| 354 | |
| 355 | weight_quant.quant_min = -(1 << (ofm_dtype.bits - 1)) |
| 356 | weight_quant.quant_max = (1 << (ofm_dtype.bits - 1)) - 1 |
| 357 | |
| 358 | weight_shape = [upscale_factor, upscale_factor, output_depth, output_depth] # HWIO |
| 359 | |
| 360 | # the single non-zero coefficient used to select the desired value needs to be placed in the 'centre value', which |
| 361 | # is calculated by finding the 'centre position' ('*' in the diagram below) and then choosing the 'value' that is |
| 362 | # below-and-right (i.e. next) to it (D). |
| 363 | # 0---1---2 |
| 364 | # | A | B | |
| 365 | # 1---*---+ |
| 366 | # | C | D | |
| 367 | # 2---+---+ |
| 368 | weight_values = [0] * (upscale_factor * upscale_factor) |
| 369 | centre_coeff = (upscale_factor // 2) * upscale_factor + (upscale_factor // 2) |
| 370 | weight_values[centre_coeff] = 1 |
| 371 | |
| 372 | # add weight tensor, this will discard the size tensor of the resize op |
| 373 | op.set_input_tensor( |
| 374 | create_const_tensor( |
| 375 | "weights", |
| 376 | weight_shape, |
| 377 | ofm.dtype, |
| 378 | np.array(weight_values).reshape(weight_shape), |
| 379 | value_dtype=weight_value_dtype, |
| 380 | quantization=weight_quant, |
| 381 | ), |
| 382 | 1, # inputs tensor weight index |
| 383 | ) |
| 384 | |
| 385 | # setup bias tensor by assign None and then call the fix-up function to create a suitable tensor. |
| 386 | # need to append the bias tensor as resize ops only have 2 inputs |
| 387 | assert len(op.inputs) == 2 |
| 388 | op.inputs.append(None) |
Fredrik Svedberg | cc219be | 2022-09-20 16:32:52 +0200 | [diff] [blame] | 389 | fixup_bias_tensors(op, None, None, DataType.int32) |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 390 | |
| 391 | # finally update the shape incase we've change the tensor shapes or connections |
| 392 | op.set_ifm_ofm_shapes() |
| 393 | |
| 394 | return op |
| 395 | |
| 396 | |
| 397 | # Convert ResizeBilinear/NearestNeighbor to a number of 1x1 average pools with nearest neighbor x2 upscaling and one |
| 398 | # final average pool with a kernel size that depends upon the resize ops upscaling factor (x2, x4 or x8). The maximum |
| 399 | # upscale factor is limited to x8 because of the limit 8x8 kernel size limit for average pool with padding. |
| 400 | def convert_resize_to_upscale_and_average_pool(op): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 401 | pre_op = op |
| 402 | outputs = op.outputs |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 403 | dtype = op.ifm.dtype |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 404 | |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 405 | op.attrs.update({"strides": (1, 1, 1, 1), "ksize": (1, 1, 1, 1)}) |
Tim Hall | 47c7636 | 2022-07-18 21:26:47 +0100 | [diff] [blame] | 406 | op.attrs["padding"] = Padding.SAME # doesn't really matter as the kernel is 1x1 |
Tim Hall | 3c5cfe9 | 2022-03-16 16:31:57 +0000 | [diff] [blame] | 407 | op.ifm_resampling_mode = resampling_mode.NEAREST |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 408 | |
| 409 | upscaled_shape = np.array(op.ifm_shapes[0].get_hw_as_list()) |
Tim Hall | 47c7636 | 2022-07-18 21:26:47 +0100 | [diff] [blame] | 410 | |
| 411 | # Get upscale factor that was calculated in the supported operators check |
| 412 | upscale_factor = op.attrs["upscale_factor"] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 413 | |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 414 | # Calculate how many times 2x2 upscaling needs to be performed |
Tim Hall | f9267da | 2022-04-20 20:19:48 +0100 | [diff] [blame] | 415 | # Force the result of round to be an integer. This is because the behaviour of rounding numpy.float64 values changed |
| 416 | # between different versions of numpy. This consistency ensures that the kernel dimensions are kept integral |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 417 | n = int(np.log2(upscale_factor)) |
| 418 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 419 | # Perform x2 upscaling n-1 times |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 420 | scaled_op = pre_op |
| 421 | for count in range(n - 1): |
| 422 | if count > 0: |
| 423 | scaled_op = op.clone(f"_{count}") |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 424 | scaled_op.inputs[0] = pre_op.outputs[0] |
| 425 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 426 | # Nearest neighbor x2 upscaling |
Tim Hall | 47c7636 | 2022-07-18 21:26:47 +0100 | [diff] [blame] | 427 | upscaled_shape = upscaled_shape * 2 |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 428 | shape = op.ofm_shapes[0].as_list() |
| 429 | shape[1:3] = upscaled_shape |
| 430 | out_tens = Tensor(shape, dtype, f"{op.outputs[0].name}_{count}") |
| 431 | out_tens.quantization = op.outputs[0].quantization.clone() |
| 432 | scaled_op.set_output_tensor(out_tens) |
| 433 | pre_op = scaled_op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 434 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 435 | scaled_op.set_ifm_ofm_shapes() |
| 436 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 437 | # Last x2 upscaling |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 438 | if n > 1: |
| 439 | scaled_op = op.clone(f"_{n-1}") |
| 440 | scaled_op.inputs[0] = pre_op.outputs[0] |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 441 | |
| 442 | if scaled_op.original_type == Op.ResizeBilinear: |
| 443 | if scaled_op.attrs["align_corners"]: |
| 444 | # no padding |
| 445 | scaled_op.attrs["padding"] = Padding.VALID |
| 446 | else: |
| 447 | # padding to the right and bottom (limits average pool to 8x8 kernel) |
| 448 | scaled_op.attrs["padding"] = Padding.EXPLICIT |
| 449 | scaled_op.attrs["explicit_padding"] = [0, 0, upscale_factor - 1, upscale_factor - 1] |
| 450 | |
| 451 | # kernal size dependent on the upscaling factor |
| 452 | scaled_op.attrs.update({"ksize": (1, upscale_factor, upscale_factor, 1)}) |
| 453 | else: # Op.ResizeNearestNeighbor |
| 454 | if scaled_op.attrs["align_corners"]: |
| 455 | # use depthwise conv to select the correct value |
| 456 | scaled_op = convert_resizenn_ac_to_depthwise_conv(scaled_op, upscale_factor) |
| 457 | else: |
Johan Alfvén | a64616c | 2022-10-17 12:29:12 +0200 | [diff] [blame] | 458 | # Keep 1x1 kernel and average pool, this applies both when |
| 459 | # half-pixel-centers is True and False. Calculations are the |
| 460 | # same in the reference. |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 461 | pass |
| 462 | |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 463 | scaled_op.outputs = outputs |
| 464 | scaled_op.outputs[0].ops = [scaled_op] |
| 465 | scaled_op.set_ifm_ofm_shapes() |
| 466 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 467 | return op |
| 468 | |
| 469 | |
Rickard Bolin | fea1516 | 2022-07-04 16:19:16 +0000 | [diff] [blame] | 470 | def convert_resizebilinear_to_depthwise_convolutions(op, half_pixel_centers=True): |
| 471 | def _compute_interpolation_values(index, input_size, output_size): |
| 472 | scale = input_size / output_size |
| 473 | scaled_value = (index + 0.5 * half_pixel_centers) * scale - 0.5 * half_pixel_centers |
| 474 | lower_bound = max(np.floor(scaled_value), 0) |
| 475 | |
| 476 | return scaled_value, lower_bound |
| 477 | |
| 478 | def _compute_kernels(input_height, input_width, output_height, output_width): |
| 479 | kernels = [] |
| 480 | for y in (1, 2): |
| 481 | for x in (1, 2): |
| 482 | sv_h, lb_h = _compute_interpolation_values(y, input_height, output_height) |
| 483 | sv_w, lb_w = _compute_interpolation_values(x, input_width, output_width) |
| 484 | |
| 485 | # Interpolation values calculated for (x, y) = ([1, 2], [1, 2]) will always generalize to the whole |
| 486 | # input for upscale = 2 and input sizes >= 2x2 and be in the correct order for going left-to-right, |
| 487 | # top-to-bottom - same as the depthwise convolution strides across each tile |
| 488 | kernel = np.zeros((2, 2)) |
| 489 | kernel[1, 1] = (1 - (sv_h - lb_h)) * (1 - (sv_w - lb_w)) |
| 490 | kernel[0, 1] = (sv_h - lb_h) * (1 - (sv_w - lb_w)) |
| 491 | kernel[1, 0] = (1 - (sv_h - lb_h)) * (sv_w - lb_w) |
| 492 | kernel[0, 0] = (sv_h - lb_h) * (sv_w - lb_w) |
| 493 | kernel *= 16 |
| 494 | kernels.append(kernel) |
| 495 | |
| 496 | return kernels |
| 497 | |
| 498 | def _build_convolutions(op, kernels): |
| 499 | dw_op_attrs = { |
| 500 | "padding": Padding.TILE, |
| 501 | "stride_h": 1, |
| 502 | "stride_w": 1, |
| 503 | "strides": (1, 1, 1, 1), |
| 504 | "depth_multiplier": 1, |
| 505 | "channel_multiplier": 1, |
| 506 | "dilation_h_factor": 1, |
| 507 | "dilation_w_factor": 1, |
| 508 | "dilation": (1, 1, 1, 1), |
| 509 | } |
| 510 | ifm = op.ifm |
| 511 | ofm = op.ofm |
| 512 | ofm.ops = [] |
| 513 | elem_size = 2 if ofm.dtype == DataType.int16 else 1 |
| 514 | |
| 515 | n, h, w, c = ifm.shape |
| 516 | _, _, ow, _ = ofm.shape |
| 517 | |
| 518 | intermediate_tens = Tensor(ifm.shape, ifm.dtype, "intermediate_tens") |
| 519 | intermediate_tens.quantization = op.outputs[0].quantization.clone() |
| 520 | avgpool_op = op |
| 521 | avgpool_op.name = "rb_init_avgpool" |
| 522 | avgpool_op.type = Op.AvgPool |
| 523 | avgpool_op.attrs["padding"] = Padding.VALID |
| 524 | avgpool_op.attrs["stride_w"] = 1 |
| 525 | avgpool_op.attrs["stride_h"] = 1 |
| 526 | avgpool_op.attrs["filter_width"] = 1 |
| 527 | avgpool_op.attrs["filter_height"] = 1 |
| 528 | avgpool_op.attrs["strides"] = [1, 1, 1, 1] |
| 529 | avgpool_op.attrs["ksize"] = [1, 1, 1, 1] |
| 530 | |
| 531 | avgpool_op.add_input_tensor(ifm) |
| 532 | avgpool_op.set_output_tensor(intermediate_tens) |
| 533 | avgpool_op.set_ifm_ofm_shapes() |
| 534 | |
| 535 | dw_conv = Operation(Op.DepthwiseConv2DBias, "depthwise_conv") |
| 536 | dw_conv._original_type = Op.ResizeBilinear |
| 537 | dw_conv.write_shape = Shape4D(n, h, w, c) |
| 538 | dw_conv.write_offset = Shape4D(0, 0, 0, 0) |
| 539 | |
| 540 | # Set the output rounding mode. Resize bilinear requires rounding away from zero. Therefore, we need to |
| 541 | # adjust the accumulated value by a "small" amount before applying natural rounding. The "small" amount |
| 542 | # should be big enough to cause a x.5 to be rounded correctly but small enough not to cause smaller |
| 543 | # values to be incorrectly rounded |
| 544 | ofm.quantization.next_after = True |
| 545 | dw_conv.rounding_mode = NpuRoundingMode.NATURAL |
| 546 | |
| 547 | # Double height and width stride to write the output of each of the four depthwise convolutions below |
| 548 | # interleaved with each other when combined with OFM tile base offsets. |
| 549 | dw_conv.ofm_stride_multiplier = [1, 2, 2] # C/H/W |
| 550 | |
| 551 | # Choose tile padding direction - pad by 1 with edge values in two direction. |
| 552 | # For example, TL (top left) will pad top and left in H/W-plane in all channels. |
| 553 | directions = [[1, 1, 0, 0], [1, 0, 0, 1], [0, 1, 1, 0], [0, 0, 1, 1]] # TL, TR, BL, BR |
| 554 | for i in (0, 1): |
| 555 | for j in (0, 1): |
| 556 | index = i * 2 + j |
| 557 | dw_conv.name = f"depthwise_conv_{index}" |
| 558 | dw_op_attrs["explicit_padding"] = directions[index] |
| 559 | dw_conv.attrs.update(dw_op_attrs) |
| 560 | |
| 561 | # This will offset the start of the write by modifying the Tile 0 base address |
| 562 | dw_conv.tile_base_offsets_ofm[0] = (i * ow + j) * c * elem_size |
| 563 | |
| 564 | ofm.ops.append(dw_conv) |
| 565 | dw_conv.outputs = [ofm] |
| 566 | |
| 567 | kernel = kernels[index] |
| 568 | shape = [2, 2, 1, c] |
| 569 | kernel = np.dstack([kernel] * c) |
| 570 | |
| 571 | quant = QuantizationParameters() |
| 572 | quant.zero_point = 0 |
| 573 | quant.scale_f32 = 1.0 / 16 |
| 574 | |
| 575 | dw_conv.inputs = [] |
| 576 | dw_conv.add_input_tensor(intermediate_tens) |
| 577 | dw_conv.add_input_tensor( |
| 578 | create_const_tensor( |
| 579 | "weights", |
| 580 | shape, |
| 581 | intermediate_tens.dtype, |
| 582 | np.array(kernel).reshape(shape), |
| 583 | value_dtype=np.int8, |
| 584 | quantization=quant, |
| 585 | ), |
| 586 | ) |
| 587 | |
| 588 | # setup bias tensor by assign None and then call the fix-up function to create a suitable tensor. |
| 589 | # need to append the bias tensor as resize ops only have 2 inputs |
| 590 | assert len(dw_conv.inputs) == 2 |
| 591 | dw_conv.inputs.append(None) |
Rickard Bolin | 017b4cc | 2022-09-23 10:16:48 +0000 | [diff] [blame] | 592 | fixup_bias_tensors(dw_conv, None, None, dtype=DataType.int32) |
Rickard Bolin | fea1516 | 2022-07-04 16:19:16 +0000 | [diff] [blame] | 593 | |
| 594 | dw_conv.set_ifm_ofm_shapes() |
| 595 | dw_conv = dw_conv.clone(f"_{index}") |
| 596 | return op |
| 597 | |
| 598 | _, input_height, input_width, _ = op.ifm.shape |
| 599 | _, output_height, output_width, _ = op.ofm.shape |
| 600 | |
| 601 | kernels = _compute_kernels(input_height, input_width, output_height, output_width) |
| 602 | op = _build_convolutions(op, kernels) |
| 603 | |
| 604 | return op |
| 605 | |
| 606 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 607 | def fixup_resize(op, arch, nng): |
| 608 | if op.type.is_resize_op() and op.run_on_npu: |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 609 | if op.ifm_shapes[0] == op.ofm_shapes[0]: |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 610 | # Bypass the resize op which is essentially a NOP |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 611 | op.inputs = op.inputs[:1] |
| 612 | op.type = Op.Identity |
| 613 | elif op.ifm_shapes[0].height == 1 and op.ifm_shapes[0].width == 1: |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 614 | convert_resize_1x1_to_add(op) |
Rickard Bolin | fea1516 | 2022-07-04 16:19:16 +0000 | [diff] [blame] | 615 | elif op.type == Op.ResizeBilinear and op.attrs.get("half_pixel_centers", False): |
| 616 | convert_resizebilinear_to_depthwise_convolutions(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 617 | else: |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 618 | convert_resize_to_upscale_and_average_pool(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 619 | |
| 620 | return op |
| 621 | |
| 622 | |
| 623 | def convert_nop_split_to_identity(op, arch, nng): |
| 624 | if op.type == Op.Split and op.attrs.get("num_splits") == 1: |
| 625 | # the list comprehension should return a list with a single tensor |
| 626 | # if it shouldn't, remove_passthrough_tensor will fail appropriately |
| 627 | op.inputs = [i for i in op.inputs if i.shape == op.outputs[0].shape] |
| 628 | op.type = Op.Identity |
| 629 | return op |
| 630 | |
| 631 | |
Ayaan Masood | a2ec5aa | 2022-04-21 14:28:03 +0100 | [diff] [blame] | 632 | def rewrite_fully_connected_input(op: Operation, arch, nng): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 633 | |
Ayaan Masood | a2ec5aa | 2022-04-21 14:28:03 +0100 | [diff] [blame] | 634 | if op.type == Op.FullyConnected: |
| 635 | new_shape = op.ifm.get_shape_as_2d(op.weights.shape[-2]) |
| 636 | assert new_shape is not None, "Tensor can not be reshaped to 2D" |
| 637 | op.ifm_shapes[0] = new_shape |
Johan Alfvén | 65835e0 | 2022-10-13 10:49:30 +0200 | [diff] [blame] | 638 | |
| 639 | if op.ifm_shapes[0].batch > 1 and op.ofm_shapes[0].batch == 1: |
| 640 | # If IFM is batching then also make sure OFM is batching |
| 641 | h, w = op.ofm_shapes[0].height, op.ofm_shapes[0].width |
| 642 | op.ofm_shapes[0] = Shape4D([h * w, 1, 1, op.ofm_shapes[0].depth]) |
| 643 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 644 | return op |
| 645 | |
| 646 | |
| 647 | def convert_batched_fc_shape(op, arch, nng): |
| 648 | if op.type == Op.FullyConnected: |
| 649 | # Check if the first dimension indicates batching |
| 650 | if op.ifm_shapes[0].batch > 1: |
| 651 | batching_split = {4: (2, 2), 8: (2, 4), 16: (4, 4)} |
| 652 | n = op.ifm_shapes[0].batch |
| 653 | h, w = batching_split.get(n, (1, n)) |
| 654 | op.ifm_shapes[0] = Shape4D([1, h, w, op.ifm_shapes[0].depth]) |
| 655 | |
| 656 | # Reshape Weights to be 4D. IO becomes HWIO |
| 657 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 658 | weight_tensor.values = np.expand_dims(np.expand_dims(weight_tensor.values, axis=0), axis=0) |
| 659 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 660 | |
| 661 | n = op.ofm_shapes[0].batch |
| 662 | h, w = batching_split.get(n, (1, n)) |
| 663 | op.ofm_shapes[0] = Shape4D([1, h, w, op.ofm_shapes[0].depth]) |
| 664 | return op |
| 665 | |
| 666 | |
| 667 | def unfuse_activation_function(op): |
| 668 | if op.type == Op.ConcatTFLite and op.run_on_npu and op.activation is not None: |
| 669 | act_op = Operation(op.activation.op_type, op.name + op.activation.op_type.name) |
| 670 | op.activation = None |
| 671 | out_tens = op.outputs[0] |
| 672 | intermediate_tens = out_tens.clone("_act_intermediate") |
| 673 | act_op.set_output_tensor(out_tens) |
| 674 | act_op.add_input_tensor(intermediate_tens) |
| 675 | op.set_output_tensor(intermediate_tens) |
| 676 | act_op.set_ifm_ofm_shapes() |
| 677 | |
| 678 | |
| 679 | def rewrite_stridedslice_output(op, arch, nng): |
| 680 | if not op.run_on_npu or op.type != Op.StridedSlice: |
| 681 | return op |
| 682 | |
| 683 | new_axis_mask = op.attrs["new_axis_mask"] |
| 684 | shrink_axis_mask = op.attrs["shrink_axis_mask"] |
| 685 | |
| 686 | if shrink_axis_mask == 0 and new_axis_mask == 0: |
| 687 | return op |
| 688 | |
| 689 | axis_4D = [0] * len(op.outputs) |
| 690 | for idx, out_tens in enumerate(op.outputs): |
| 691 | output_shape = list(out_tens.shape) |
| 692 | |
| 693 | if shrink_axis_mask != 0: |
| 694 | n = 0 |
| 695 | axis = 0 |
| 696 | while shrink_axis_mask: |
| 697 | prev_mask = shrink_axis_mask |
| 698 | n += 1 |
| 699 | shrink_axis_mask &= shrink_axis_mask - 1 |
| 700 | axis = int(math.log2(prev_mask - shrink_axis_mask)) |
| 701 | output_shape = output_shape[:axis] + [1] + output_shape[axis:] |
| 702 | |
| 703 | assert len(out_tens.shape) == (len(op.inputs[0].shape) - n) |
| 704 | op.attrs["shrink_axis_mask"] = 0 |
| 705 | if axis >= 0: |
| 706 | axis_4D[idx] = axis + (4 - len(output_shape)) |
| 707 | else: |
| 708 | axis_4D[idx] = axis |
| 709 | op.ofm_shapes[idx] = Shape4D(output_shape) |
| 710 | |
| 711 | elif new_axis_mask != 0: |
| 712 | n = 0 |
| 713 | axis = 0 |
| 714 | while new_axis_mask: |
| 715 | prev_mask = new_axis_mask |
| 716 | n += 1 |
| 717 | new_axis_mask &= new_axis_mask - 1 |
| 718 | axis = int(math.log2(prev_mask - new_axis_mask)) |
| 719 | output_shape = output_shape[:axis] + output_shape[(axis + 1) :] |
| 720 | new_axis_mask >>= 1 |
| 721 | |
| 722 | assert len(out_tens.shape) == (len(op.inputs[0].shape) + n) |
| 723 | op.attrs["new_axis_mask"] = 0 |
| 724 | if axis >= 0: |
| 725 | axis_4D[idx] = axis + (4 - len(output_shape)) |
| 726 | else: |
| 727 | axis_4D[idx] = axis |
| 728 | op.ofm_shapes[idx] = Shape4D(output_shape) |
| 729 | |
| 730 | op.attrs["split_axis_4D"] = axis_4D |
| 731 | return op |
| 732 | |
| 733 | |
| 734 | def rewrite_unpack_output(op, arch, nng): |
| 735 | tens = op.outputs[0] |
| 736 | if op.run_on_npu and op.type == Op.Unpack: |
| 737 | # Unpack is also referred to as Unstack |
| 738 | axis = int(op.attrs["axis"]) |
| 739 | if axis < 0: # Convert to positive axis |
| 740 | axis = len(op.inputs[0].shape) + 1 + axis |
| 741 | op.type = Op.UnpackReshaped |
| 742 | desired_output_shape = tens.shape[:axis] + [1] + tens.shape[axis:] |
| 743 | |
| 744 | axis_4D = axis + (4 - len(desired_output_shape)) |
| 745 | op.attrs["split_axis_4D"] = [axis_4D] * len(op.outputs) |
| 746 | |
| 747 | for idx, out_tens in enumerate(op.outputs): |
| 748 | op.ofm_shapes[idx] = Shape4D(desired_output_shape) |
| 749 | return op |
| 750 | |
| 751 | |
| 752 | def add_padding_fields(op, arch, nng): |
| 753 | if op.run_on_npu: |
| 754 | if "padding" in op.attrs: |
| 755 | input_shape = op.ifm_shapes[0] |
| 756 | output_shape = op.ofm_shapes[0] |
| 757 | if op.type.is_conv2d_op() or op.type.is_depthwise_conv2d_op(): |
| 758 | kernel_size = op.inputs[1].shape[:2] |
| 759 | elif op.type.is_pool_op() or op.type.npu_block_type == NpuBlockType.ReduceSum: |
| 760 | kernel_size = op.attrs["ksize"][1:3] |
| 761 | else: |
| 762 | raise UnsupportedFeatureError(f"Unknown operation that uses padding: {optype_to_builtintype(op.type)}") |
| 763 | |
| 764 | if op.type == Op.Conv2DBackpropInputSwitchedBias: |
| 765 | upscaling_factor = output_shape.height // input_shape.height |
| 766 | padding, skirt = calc_upscaled_padding_and_skirt( |
| 767 | op.attrs["padding"], kernel_size, op.attrs["strides"], input_shape, upscaling_factor |
| 768 | ) |
| 769 | else: |
| 770 | padding, skirt = calc_padding_and_skirt( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 771 | op.attrs["padding"], |
| 772 | op.kernel, |
| 773 | input_shape, |
| 774 | op.attrs.get("explicit_padding"), |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 775 | ) |
| 776 | |
| 777 | op.attrs["explicit_padding"] = padding |
| 778 | op.attrs["skirt"] = skirt |
| 779 | |
| 780 | return op |
| 781 | |
| 782 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 783 | def reorder_depthwise_weights(op, arch, nng): |
| 784 | if op.type.is_depthwise_conv2d_op(): |
| 785 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 786 | weight_tensor.values = np.transpose(weight_tensor.values, (0, 1, 3, 2)) |
| 787 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 788 | weight_tensor.weight_transpose_depthwise = True |
| 789 | |
| 790 | return op |
| 791 | |
| 792 | |
| 793 | def optimise_strided_conv(op, arch, nng): |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 794 | if op.type != Op.Conv2DBias or op.op_index != 0: |
| 795 | return op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 796 | stride_x, stride_y = op.get_kernel_stride() |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 797 | weight_tensor = op.weights |
| 798 | ifm_shape = op.ifm_shapes[0] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 799 | |
| 800 | if ( |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 801 | stride_x == 2 |
| 802 | and ifm_shape.depth <= 4 |
| 803 | and ifm_shape.width % 2 == 0 |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 804 | and weight_tensor is not None |
| 805 | and weight_tensor.shape[1] >= 2 |
| 806 | ): |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 807 | k_w, _ = op.get_kernel_size() |
| 808 | curr_padding_x = needed_total_padding(ifm_shape.width, 2, k_w) |
| 809 | optimised_padding_x = needed_total_padding(ifm_shape.width // 2, 1, (k_w + 1) // 2) |
| 810 | if curr_padding_x != optimised_padding_x: |
| 811 | # Horizontal padding would become different after optimisation; this would not work |
| 812 | return op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 813 | # IFM |
| 814 | op.ifm_shapes[0] = Shape4D([ifm_shape.batch, ifm_shape.height, ifm_shape.width // 2, ifm_shape.depth * 2]) |
| 815 | |
| 816 | # Weights |
| 817 | weight_shape = weight_tensor.shape |
| 818 | if weight_shape[1] % 2 != 0: |
| 819 | weight_shape[1] = weight_shape[1] + 1 |
| 820 | padded_array = np.zeros(weight_shape) |
| 821 | for i in range(weight_shape[0]): |
| 822 | padded_array[i] = np.vstack( |
| 823 | [ |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 824 | weight_tensor.values[i], |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 825 | np.full((1, weight_shape[2], weight_shape[3]), weight_tensor.quantization.zero_point), |
| 826 | ] |
| 827 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 828 | weight_tensor.values = padded_array |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 829 | weight_shape[1] //= 2 |
| 830 | weight_shape[2] *= 2 |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 831 | weight_tensor.values = np.reshape(weight_tensor.values, weight_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 832 | weight_tensor.set_all_shapes(weight_shape) |
| 833 | # If multiple copies of the weights are used, we could avoid |
| 834 | # them having the same address by changing the value_id |
| 835 | weight_tensor.value_id = uuid.uuid4() |
| 836 | |
| 837 | # Strides |
| 838 | stride_x = 1 |
| 839 | op.attrs.update({"stride_w": stride_x, "stride_h": stride_y, "strides": (1, stride_y, stride_x, 1)}) |
| 840 | |
| 841 | return op |
| 842 | |
| 843 | |
| 844 | def convert_conv_to_fc(op, arch, nng): |
| 845 | # Conv 1x1 can be equivalent to Fully Connected. |
| 846 | # By representing certain convs as fully connected layers, Vela can better determine wether or not to use |
| 847 | # caching/double buffering for the weights. |
| 848 | # (Weights dont need to be reloaded for convs when IFM H and W are 1) |
| 849 | if op.type == Op.Conv2DBias: |
| 850 | h = op.ifm_shapes[0].height |
| 851 | w = op.ifm_shapes[0].width |
| 852 | kh, kw, _, _ = op.inputs[1].shape |
| 853 | if h == 1 and w == 1 and kh == 1 and kw == 1: |
| 854 | # Overwrite this op as a Fully Connected Op |
| 855 | op.name += "_fc" |
| 856 | op.type = Op.FullyConnected |
| 857 | op.attrs = { |
| 858 | "weights_format": 0, |
| 859 | } |
| 860 | # Reshape Weights to be 2D. HWIO becomes just IO (as H and W are 1, they can just be dropped) |
| 861 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 862 | weight_tensor.values = weight_tensor.values.squeeze(axis=(0, 1)) |
| 863 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 864 | |
| 865 | DebugDatabase.add_optimised(op, op) |
| 866 | return op |
| 867 | |
| 868 | |
| 869 | def fixup_relus_with_differing_ifm_ofm_scaling(op, arch, nng): |
| 870 | if op.run_on_npu and op.type.is_relu_op(): |
| 871 | ifm = op.inputs[0] |
| 872 | ofm = op.outputs[0] |
| 873 | # Relu with differing IFM and OFM scaling cannot be fused with another primary op |
| 874 | # and requires its own to be inserted |
| 875 | if not check_quantized_tens_scaling_equal(ifm, ofm): |
| 876 | # Override this op with its own primary op (avgpool) |
| 877 | relu_fused_op = create_avgpool_nop(op.name + "_avgpool") |
| 878 | # And fuse the original activation function to it |
| 879 | relu_fused_op.activation = create_activation_function(op.type) |
Fredrik Svedberg | 1a7527c | 2021-09-13 15:52:16 +0200 | [diff] [blame] | 880 | # Add explicit rescaling |
| 881 | rescale = ifm.quantization.scale_f32 / ofm.quantization.scale_f32 |
| 882 | multiplier, shift = scaling.quantise_scale(rescale) |
Fredrik Svedberg | 4a434cb | 2022-09-27 14:13:01 +0200 | [diff] [blame] | 883 | relu_fused_op.explicit_scaling = ExplicitScaling(False, [shift], [multiplier]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 884 | # Tidy up and assign the ifm and ofm to the new op |
| 885 | ifm.consumer_list.remove(op) |
| 886 | |
| 887 | relu_fused_op.add_input_tensor(ifm) |
| 888 | relu_fused_op.set_output_tensor(ofm) |
| 889 | relu_fused_op.set_ifm_ofm_shapes() |
| 890 | op = relu_fused_op |
| 891 | return op |
| 892 | |
| 893 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 894 | def convert_softmax(op, arch, nng): |
| 895 | if op.type == Op.Softmax and op.run_on_npu: |
| 896 | softmax = SoftMax(op) |
| 897 | op = softmax.get_graph() |
| 898 | return op |
| 899 | |
| 900 | |
Fredrik Svedberg | 8ddd489 | 2022-08-19 16:06:04 +0200 | [diff] [blame] | 901 | def convert_prelu(op, arch, nng): |
| 902 | if op.type == Op.Prelu: |
| 903 | ifm, alpha, ofm = op.get_ifm_ifm2_ofm() |
| 904 | if None in (ifm, alpha, ofm): |
| 905 | return op |
| 906 | |
Fredrik Svedberg | 6659165 | 2022-08-29 10:51:27 +0200 | [diff] [blame] | 907 | if alpha.values is not None: |
| 908 | # If const alpha check for possible optimisations |
| 909 | alpha_zp = alpha.quantization.zero_point |
| 910 | alpha_scale = alpha.quantization.scale_f32 |
| 911 | # If all alpha values are the same the PReLU can be converted to LeakyRelu |
| 912 | alpha_min = (alpha.values.min().astype(np.int) - alpha_zp) * alpha_scale |
| 913 | alpha_max = (alpha.values.max().astype(np.int) - alpha_zp) * alpha_scale |
| 914 | if alpha_min == alpha_max: |
| 915 | # or even a Relu |
| 916 | if alpha_min == 0: |
| 917 | new_op = Op.Relu |
| 918 | else: |
| 919 | new_op = Op.LeakyRelu |
| 920 | op.attrs["alpha"] = alpha_min |
| 921 | # setup alpha_scaling for bit exact result |
| 922 | ifm_scale = ifm.quantization.scale_f32 |
| 923 | ofm_scale = ofm.quantization.scale_f32 |
| 924 | alpha_scale, alpha_shift = scaling.elementwise_mul_scale(ifm_scale, alpha_scale, ofm_scale) |
| 925 | op.attrs["alpha_scaling"] = (alpha.values.min() - alpha_zp, alpha_scale, alpha_shift) |
| 926 | # Change op type |
| 927 | op.type = new_op |
| 928 | op.name = op.name.replace("Prelu", new_op.name) |
| 929 | del op.inputs[1] # Remove alpha tensor |
| 930 | return op |
| 931 | elif alpha_max < 1: |
| 932 | # If alpha_max is less than 1 convert PReLU to Max(alpha * IFM, identity * IFM) |
| 933 | # Multiply with alpha tensor |
| 934 | mul_alpha = Operation(Op.Mul, op.name + "_mul_alpha") |
| 935 | mul_alpha.add_input_tensor(ifm) |
| 936 | mul_alpha.add_input_tensor(alpha) |
| 937 | fm_alpha = ofm.clone(op.name + "_alpha", set_unique=True) |
| 938 | mul_alpha.set_output_tensor(fm_alpha) |
| 939 | mul_alpha.set_ifm_ofm_shapes() |
| 940 | DebugDatabase.add_optimised(op, mul_alpha) |
| 941 | if check_quantized_tens_scaling_equal(ifm, ofm): |
| 942 | # No scaling is needed |
| 943 | fm_id = ifm |
| 944 | else: |
| 945 | # Add multiplication with identity |
| 946 | mul_identity = Operation(Op.Mul, op.name + "_mul_identity") |
| 947 | mul_identity.add_input_tensor(ifm) |
| 948 | # Create const tensor containing identity as scalar |
| 949 | quantization = ifm.quantization.clone() |
| 950 | quantization.scale_f32 = np.float32(1) |
| 951 | quantization.zero_point = 0 |
| 952 | one = create_const_tensor("one_const", [], ifm.dtype, [1], quantization=quantization) |
| 953 | mul_identity.add_input_tensor(one) |
| 954 | # Make sure that fm_id is allocated to a different address than fm_alpha |
| 955 | fm_id = ofm.clone(op.name + "_id", set_unique=True) |
| 956 | mul_identity.set_output_tensor(fm_id) |
| 957 | mul_identity.set_ifm_ofm_shapes() |
| 958 | |
| 959 | # Combine scaled and alpha multiplied values |
| 960 | max_op = Operation(Op.Maximum, op.name + "_max") |
| 961 | max_op.add_input_tensor(fm_alpha) |
| 962 | max_op.add_input_tensor(fm_id) |
| 963 | max_op.set_output_tensor(ofm) |
| 964 | max_op.set_ifm_ofm_shapes() |
| 965 | |
| 966 | DebugDatabase.add_optimised(op, max_op) |
| 967 | ifm.consumer_list.remove(op) |
| 968 | return max_op |
| 969 | |
| 970 | # Catch all PReLU conversion for the cases that could not be optimised above |
Fredrik Svedberg | 8ddd489 | 2022-08-19 16:06:04 +0200 | [diff] [blame] | 971 | no_scale_quant = ifm.quantization.clone() |
| 972 | no_scale_quant.scale_f32 = None |
| 973 | no_scale_quant.zero_point = 0 |
Fredrik Svedberg | 6659165 | 2022-08-29 10:51:27 +0200 | [diff] [blame] | 974 | zero = create_const_tensor("zero_const", [], ifm.dtype, [0], quantization=no_scale_quant) |
Fredrik Svedberg | 8ddd489 | 2022-08-19 16:06:04 +0200 | [diff] [blame] | 975 | |
| 976 | # Select values < 0 |
| 977 | min_op = Operation(Op.Minimum, op.name + "_min") |
| 978 | min_op.add_input_tensor(ifm) |
| 979 | min_op.add_input_tensor(zero) |
| 980 | fm_negative = ifm.clone(op.name + "_negative", set_unique=True) |
| 981 | min_op.set_output_tensor(fm_negative) |
| 982 | min_op.set_ifm_ofm_shapes() |
| 983 | DebugDatabase.add_optimised(op, min_op) |
| 984 | |
| 985 | # and multiply with alpha tensor |
| 986 | mul_alpha = Operation(Op.Mul, op.name + "_mul_alpha") |
| 987 | mul_alpha.add_input_tensor(fm_negative) |
| 988 | mul_alpha.add_input_tensor(alpha) |
| 989 | fm_alpha = ofm.clone(op.name + "_negative_alpha", set_unique=True) |
| 990 | mul_alpha.set_output_tensor(fm_alpha) |
| 991 | mul_alpha.set_ifm_ofm_shapes() |
| 992 | DebugDatabase.add_optimised(op, mul_alpha) |
| 993 | |
| 994 | # Select (and scale) values > 0 |
| 995 | relu_op = Operation(Op.Relu, op.name + "_relu") |
| 996 | relu_op.add_input_tensor(ifm) |
| 997 | fm_scaled = ofm.clone(op.name + "_positive_scaled", set_unique=True) |
| 998 | relu_op.set_output_tensor(fm_scaled) |
| 999 | relu_op.set_ifm_ofm_shapes() |
| 1000 | DebugDatabase.add_optimised(op, relu_op) |
| 1001 | |
| 1002 | # Add scaled and alpha multiplied values (without scaling) |
Fredrik Svedberg | 4a434cb | 2022-09-27 14:13:01 +0200 | [diff] [blame] | 1003 | add_op = Operation(Op.Add, op.name + "_add") |
| 1004 | add_op.explicit_scaling = ExplicitScaling(False, shift=[0], multiplier=[1]) # No scaling |
Fredrik Svedberg | 8ddd489 | 2022-08-19 16:06:04 +0200 | [diff] [blame] | 1005 | add_op.add_input_tensor(fm_alpha) |
| 1006 | add_op.add_input_tensor(fm_scaled) |
| 1007 | add_op.set_output_tensor(ofm) |
| 1008 | add_op.set_ifm_ofm_shapes() |
| 1009 | |
| 1010 | DebugDatabase.add_optimised(op, add_op) |
| 1011 | ifm.consumer_list.remove(op) |
| 1012 | op = add_op |
| 1013 | |
| 1014 | return op |
| 1015 | |
| 1016 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1017 | def convert_mul_max_to_abs_or_lrelu(op, arch, nng): |
| 1018 | r"""Whenever there is a subgraph with this topology: |
| 1019 | |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1020 | Input X For X = -1 or X > 0 |
| 1021 | | \ / This subgraph can be replaced with either |
| 1022 | | Mul an Abs (if X = -1) or a LeakyReLU (if X > 0) |
| 1023 | | / |
| 1024 | Max |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1025 | """ |
| 1026 | |
| 1027 | if op.type == Op.Maximum: |
| 1028 | # finds the Mul input(s) to the Max |
| 1029 | muls = [i for i in op.inputs if i.ops[0].type == Op.Mul] |
| 1030 | if len(muls) == 1: |
| 1031 | mul = muls[0].ops[0] |
| 1032 | elif len(muls) == 2: |
| 1033 | # In the case both inputs are Muls, find the one with the same input as the Max |
Fredrik Svedberg | 6659165 | 2022-08-29 10:51:27 +0200 | [diff] [blame] | 1034 | mul_ifms = [m for m in muls if len(set(op.inputs + m.ops[0].inputs)) == 1] |
| 1035 | if len(mul_ifms): |
| 1036 | mul = mul_ifms[0].ops[0] |
| 1037 | else: |
| 1038 | # Not using same input |
| 1039 | return op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1040 | else: |
| 1041 | # No Mul inputs |
| 1042 | return op |
| 1043 | |
| 1044 | # make sure the Mul doesn't have any other consumers |
| 1045 | mul_ofm = mul.outputs[0] |
| 1046 | if len(mul_ofm.consumers()) != 1: |
| 1047 | return op |
| 1048 | # make sure the Mul doesn't have a fused activation function |
| 1049 | if mul.activation: |
| 1050 | return op |
| 1051 | ifm, ofm = op.get_ifm_ofm() |
| 1052 | if ifm is None or ofm is None: |
| 1053 | return op |
| 1054 | |
| 1055 | if ifm.dtype not in (DataType.uint8, DataType.int8) or ifm.dtype != ofm.dtype: |
| 1056 | return op |
| 1057 | if not check_quantized_tens_scaling_equal(ifm, ofm) or not check_quantized_tens_scaling_equal(ifm, mul_ofm): |
| 1058 | # rewrite to LeakyRelu currently only makes sense if the quantization is identical |
| 1059 | return op |
| 1060 | |
| 1061 | # finds the branched input that goes to both the Max and the Mul |
| 1062 | shared = set(op.inputs) & set(mul.inputs) |
| 1063 | if len(shared) == 1: |
| 1064 | shared_in = shared.pop() |
| 1065 | # find the constant scalar input to the Mul |
| 1066 | const_tens = (set(mul.inputs) - {shared_in}).pop() |
| 1067 | # check that it is a scalar |
| 1068 | if const_tens.shape != []: |
| 1069 | return op |
| 1070 | const = const_tens.ops[0] |
| 1071 | # check that it is a constant |
| 1072 | if const.type != Op.Const: |
| 1073 | return op |
| 1074 | # Remove the Mul from the shared input's consumers |
| 1075 | shared_in.consumer_list.remove(mul) |
| 1076 | else: |
| 1077 | return op |
| 1078 | |
| 1079 | val = const.outputs[0].values |
| 1080 | if val >= 0: |
| 1081 | new_op = Op.LeakyRelu |
| 1082 | op.attrs["alpha"] = val |
| 1083 | # to produce bit exact results, the alpha is not enough; |
| 1084 | # save additional scaling info in attr "alpha_scale", to be used as input |
| 1085 | # to the LUT construction |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1086 | alpha_scalar = const_tens.values - const_tens.quantization.zero_point |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1087 | mul_ifm_scale = np.double(ifm.quantization.scale_f32) |
| 1088 | mul_ifm2_scale = np.double(const_tens.quantization.scale_f32) |
| 1089 | mul_ofm_scale = np.double(mul_ofm.quantization.scale_f32) |
| 1090 | alpha_scale, alpha_shift = scaling.elementwise_mul_scale(mul_ifm_scale, mul_ifm2_scale, mul_ofm_scale) |
| 1091 | op.attrs["alpha_scaling"] = (alpha_scalar, alpha_scale, alpha_shift) |
| 1092 | elif val == -1: |
| 1093 | new_op = Op.Abs |
| 1094 | else: |
| 1095 | return op |
| 1096 | |
| 1097 | op.type = new_op |
| 1098 | op.name = op.name.replace("Maximum", new_op.name) |
| 1099 | op.outputs[0].name = op.outputs[0].name.replace("Maximum", new_op.name) |
| 1100 | op.inputs = [shared_in] |
| 1101 | op.set_ifm_ofm_shapes() |
| 1102 | |
| 1103 | # Record optimisation in debug database |
| 1104 | DebugDatabase.add_optimised(op, op) |
| 1105 | |
| 1106 | return op |
| 1107 | |
| 1108 | |
| 1109 | def convert_hardswish_to_lut(op, arch, nng): |
| 1110 | if op.type == Op.HardSwish: |
| 1111 | ifm, ofm = op.get_ifm_ofm() |
| 1112 | # Generate the LUT |
| 1113 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 1114 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 1115 | zp_in = ifm.quantization.zero_point |
| 1116 | zp_out = ofm.quantization.zero_point |
| 1117 | ifm_scale_hires = (1 / 128) * ifm_scale |
| 1118 | relu_multiplier = np.double(3 / 32768) |
| 1119 | out_scale, out_shift = scaling.quantise_scale(ifm_scale_hires / ofm_scale) |
| 1120 | relu_scale, relu_shift = scaling.quantise_scale(ifm_scale_hires / relu_multiplier) |
| 1121 | # Use 16bit scale |
| 1122 | out_scale_16 = fp_math.downscale_multiplier_int32_to_int16(out_scale) |
| 1123 | relu_scale_16 = fp_math.downscale_multiplier_int32_to_int16(relu_scale) |
| 1124 | |
| 1125 | values = [] |
| 1126 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 1127 | quantized_min = min(ix) |
| 1128 | quantized_max = max(ix) |
| 1129 | for x in ix: |
| 1130 | input_value = x - zp_in |
| 1131 | input_value_hires = input_value * 128 |
| 1132 | # Compute the input value on essentially the output scale, not shifted yet |
| 1133 | input_value_preshift = fp_math.saturating_rounding_mul16(input_value_hires, out_scale_16) |
| 1134 | # Compute the "relu-ish multiplier". This matches the code in TensorFlow Lite Micro kernel |
| 1135 | relu_value = np.int16(input_value_hires) |
| 1136 | if relu_shift < 31: |
| 1137 | relu_value = fp_math.shift_left16(relu_value, 30 - relu_shift) |
| 1138 | |
| 1139 | relu_value = fp_math.saturating_rounding_mul16(relu_value, relu_scale_16) |
| 1140 | |
| 1141 | if relu_shift < 31: |
| 1142 | relu_value = fp_math.shift_left16(relu_value, 1) |
| 1143 | |
| 1144 | if relu_shift > 31: |
| 1145 | relu_value = fp_math.rounding_divide_by_pot(relu_value, relu_shift - 31) |
| 1146 | |
| 1147 | # Rescaled the value into a 16bit fixedpoint relu_value in [-1, 1] |
| 1148 | # Now convert that to a 16bit fixedpoint value in [0, 1] |
| 1149 | relu_value = (relu_value + (1 << 15)) >> 1 |
| 1150 | lut_result = fp_math.saturating_mul16(relu_value, input_value_preshift) |
| 1151 | shift = 31 - out_shift |
| 1152 | shift = -shift if shift < 0 else 0 |
| 1153 | # Finally apply the output shift |
| 1154 | lut_result = fp_math.rounding_divide_by_pot(lut_result, shift) + zp_out |
| 1155 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 1156 | values.append(lut_result) |
| 1157 | return convert_to_lut(op, values, "hardswish") |
| 1158 | return op |
| 1159 | |
| 1160 | |
| 1161 | def convert_lrelu_to_mul_max(op, arch): |
| 1162 | # Converts LeakyRelu to Max(alpha * IFM, identity * IFM) |
| 1163 | # (the opposite of convert_mul_max_to_abs_or_lrelu) |
| 1164 | ifm, ofm = op.get_ifm_ofm() |
| 1165 | if ifm is None or ofm is None: |
| 1166 | return op |
| 1167 | |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1168 | alpha = np.float32(op.attrs["alpha"]) |
| 1169 | use_mul_max = 0 < alpha < 1 |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1170 | is_converted_prelu = "alpha_scaling" in op.attrs |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1171 | if use_mul_max: |
| 1172 | mul_ifm = ifm |
| 1173 | new_op = Op.Maximum |
| 1174 | else: |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1175 | # Need to use a different approach for alpha < 0 or alpha > 1 |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1176 | no_scale_quant = ifm.quantization.clone() |
| 1177 | no_scale_quant.scale_f32 = None |
| 1178 | no_scale_quant.zero_point = 0 |
| 1179 | zero = create_const_tensor("zero_const", [], ifm.dtype, [0], quantization=no_scale_quant) |
| 1180 | |
| 1181 | # Select values < 0 |
| 1182 | min_op = Operation(Op.Minimum, op.name + "_min") |
| 1183 | min_op.add_input_tensor(ifm) |
| 1184 | min_op.add_input_tensor(zero) |
| 1185 | mul_ifm = ifm.clone(op.name + "_negative", set_unique=True) |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1186 | if alpha < 0 and not is_converted_prelu: |
| 1187 | # For negative alpha that is not from a converted PReLU we need to use |
| 1188 | # int32 Mul below to perform the (negative) alpha scaling |
| 1189 | mul_ifm.dtype = DataType.int32 |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1190 | min_op.set_output_tensor(mul_ifm) |
| 1191 | min_op.set_ifm_ofm_shapes() |
Fredrik Svedberg | 4a434cb | 2022-09-27 14:13:01 +0200 | [diff] [blame] | 1192 | new_op = Op.Add |
| 1193 | op.explicit_scaling = ExplicitScaling(False, shift=[0], multiplier=[1]) # No scaling |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1194 | DebugDatabase.add_optimised(op, min_op) |
| 1195 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1196 | # Add multiplication with alpha |
| 1197 | mul_alpha = Operation(Op.Mul, op.name + "_mul_alpha") |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1198 | mul_alpha.add_input_tensor(mul_ifm) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1199 | # Create const tensor containing alpha as scalar |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1200 | quantization = ifm.quantization.clone() |
| 1201 | quantization.min = 0 |
| 1202 | quantization.max = alpha * (quantization.quant_max - quantization.quant_min) |
| 1203 | quantization.zero_point = 0 |
Fredrik Svedberg | 7f3ccd5 | 2022-09-13 15:22:01 +0200 | [diff] [blame] | 1204 | alpha_dtype = mul_ifm.dtype |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1205 | if is_converted_prelu: |
| 1206 | # The LeakyRelu was the result from convert_prelu and the scaling is provided |
Fredrik Svedberg | 6659165 | 2022-08-29 10:51:27 +0200 | [diff] [blame] | 1207 | scalar, alpha_scale, alpha_shift = op.attrs["alpha_scaling"] |
Fredrik Svedberg | 4a434cb | 2022-09-27 14:13:01 +0200 | [diff] [blame] | 1208 | mul_alpha.explicit_scaling = ExplicitScaling(False, [alpha_shift], [alpha_scale]) |
Fredrik Svedberg | 7f3ccd5 | 2022-09-13 15:22:01 +0200 | [diff] [blame] | 1209 | elif alpha == 0 or np.isinf(1 / alpha): |
| 1210 | # Handling of alpha near or at zero |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 1211 | quantization.scale_f32 = np.float32(1) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1212 | scalar = 0 |
| 1213 | else: |
| 1214 | quantization.scale_f32 = alpha |
Fredrik Svedberg | 7f3ccd5 | 2022-09-13 15:22:01 +0200 | [diff] [blame] | 1215 | if alpha_dtype == DataType.int32: |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1216 | # When the datatype is int32 (alpha negative) we need to do the scaling with the multiplication |
Fredrik Svedberg | 7f3ccd5 | 2022-09-13 15:22:01 +0200 | [diff] [blame] | 1217 | scalar, _ = scaling.elementwise_mul_scale(ifm.quantization.scale_f32, alpha, ofm.quantization.scale_f32) |
| 1218 | else: |
| 1219 | scalar = 1 |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1220 | alpha_tens = create_const_tensor( |
Fredrik Svedberg | 7f3ccd5 | 2022-09-13 15:22:01 +0200 | [diff] [blame] | 1221 | op.name + "_alpha_scalar", [1], alpha_dtype, [scalar], alpha_dtype.as_numpy_type(), quantization=quantization |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1222 | ) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1223 | mul_alpha.add_input_tensor(alpha_tens) |
| 1224 | fm_alpha = ofm.clone(op.name + "_alpha", set_unique=True) |
| 1225 | mul_alpha.set_output_tensor(fm_alpha) |
| 1226 | mul_alpha.set_ifm_ofm_shapes() |
| 1227 | DebugDatabase.add_optimised(op, mul_alpha) |
| 1228 | |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1229 | if not use_mul_max: |
| 1230 | relu_op = Operation(Op.Relu, op.name + "_relu") |
| 1231 | relu_op.add_input_tensor(ifm) |
| 1232 | fm_id = ofm.clone(op.name + "_positive_scaled", set_unique=True) |
| 1233 | relu_op.set_output_tensor(fm_id) |
| 1234 | relu_op.set_ifm_ofm_shapes() |
| 1235 | DebugDatabase.add_optimised(op, relu_op) |
| 1236 | elif check_quantized_tens_scaling_equal(ifm, ofm): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1237 | # No identity multiplication is needed |
| 1238 | fm_id = ifm |
| 1239 | else: |
| 1240 | # Add multiplication with identity |
| 1241 | mul_identity = Operation(Op.Mul, op.name + "_mul_identity") |
| 1242 | mul_identity.add_input_tensor(ifm) |
| 1243 | # Create const tensor containing identity as scalar |
| 1244 | quantization = ifm.quantization.clone() |
| 1245 | quantization.min = 0 |
| 1246 | quantization.max = quantization.quant_max - quantization.quant_min |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 1247 | quantization.scale_f32 = np.float32(1) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1248 | quantization.zero_point = 0 |
| 1249 | identity_tens = create_const_tensor( |
| 1250 | op.name + "_id_scalar", [], ifm.dtype, [1], np.uint8, quantization=quantization |
| 1251 | ) |
| 1252 | mul_identity.add_input_tensor(identity_tens) |
| 1253 | # Make sure that fm_id is allocated to a different address than fm_alpha |
| 1254 | fm_id = ofm.clone(op.name + "_id", set_unique=True) |
| 1255 | mul_identity.set_output_tensor(fm_id) |
| 1256 | mul_identity.set_ifm_ofm_shapes() |
| 1257 | DebugDatabase.add_optimised(op, mul_identity) |
| 1258 | |
| 1259 | # Convert LeakyRelu to Max, add the results of the multiplication(s) as inputs |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1260 | op.type = new_op |
| 1261 | op.name = op.name.replace("LeakyRelu", new_op.name) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1262 | op.inputs = [] |
| 1263 | ifm.consumer_list.remove(op) |
| 1264 | op.add_input_tensor(fm_alpha) |
| 1265 | op.add_input_tensor(fm_id) |
| 1266 | op.set_ifm_ofm_shapes() |
| 1267 | |
| 1268 | DebugDatabase.add_optimised(op, op) |
| 1269 | return op |
| 1270 | |
| 1271 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1272 | def convert_to_lut8(op, fn, fn_name): |
| 1273 | # Converts op to a no-op + int8/uint8 LUT which is generated with the given function. |
| 1274 | # fn is a function(real) -> real |
| 1275 | ifm, ofm = op.get_ifm_ofm() |
| 1276 | if ifm.dtype not in (DataType.uint8, DataType.int8) or ifm.dtype != ofm.dtype: |
| 1277 | return op |
| 1278 | # Generate the LUT |
| 1279 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 1280 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 1281 | zp_in = ifm.quantization.zero_point |
| 1282 | zp_out = ofm.quantization.zero_point |
| 1283 | values = [] |
| 1284 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 1285 | quantized_min = min(ix) |
| 1286 | quantized_max = max(ix) |
| 1287 | for x in ix: |
| 1288 | x_real = ifm_scale * (x - zp_in) |
| 1289 | y_real = fn(x_real) |
| 1290 | lut_result = round_away_zero(zp_out + y_real / ofm_scale) |
| 1291 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 1292 | values.append(lut_result) |
| 1293 | return convert_to_lut(op, values, fn_name) |
| 1294 | |
| 1295 | |
| 1296 | def convert_lrelu_to_lut(op, arch): |
| 1297 | ifm, ofm = op.get_ifm_ofm() |
| 1298 | # Generate the LUT |
| 1299 | alpha = op.attrs["alpha"] |
| 1300 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 1301 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 1302 | zp_in = ifm.quantization.zero_point |
| 1303 | zp_out = ofm.quantization.zero_point |
| 1304 | identity_scale, identity_shift = scaling.elementwise_mul_scale(ifm_scale, 1, ofm_scale) |
| 1305 | alpha_scalar = 1 |
| 1306 | alpha_scale, alpha_shift = scaling.elementwise_mul_scale(ifm_scale, alpha, ofm_scale) |
| 1307 | if "alpha_scaling" in op.attrs: |
| 1308 | # The LeakyRelu was the result from convert_mul_max_to_abs_or_lrelu |
| 1309 | alpha_scalar, alpha_scale, alpha_shift = op.attrs["alpha_scaling"] |
| 1310 | values = [] |
| 1311 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 1312 | quantized_min = min(ix) |
| 1313 | quantized_max = max(ix) |
| 1314 | for x in ix: |
| 1315 | if x < zp_in: |
| 1316 | lut_result = zp_out + fp_math.multiply_by_quantized_multiplier( |
| 1317 | alpha_scalar * (x - zp_in), alpha_scale, alpha_shift |
| 1318 | ) |
| 1319 | else: |
| 1320 | lut_result = zp_out + fp_math.multiply_by_quantized_multiplier(x - zp_in, identity_scale, identity_shift) |
| 1321 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 1322 | values.append(lut_result) |
| 1323 | return convert_to_lut(op, values, "lrelu") |
| 1324 | |
| 1325 | |
| 1326 | def convert_lrelu(op, arch, nng): |
| 1327 | # Converts LeakyRelu to a LUT based solution if possible, otherwise a mul + max |
| 1328 | if op.type != Op.LeakyRelu: |
| 1329 | return op |
| 1330 | ifm, ofm = op.get_ifm_ofm() |
| 1331 | if ifm is None or ofm is None: |
| 1332 | return op |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1333 | alpha = op.attrs["alpha"] |
| 1334 | if alpha == 0: |
| 1335 | # When alpha is 0 the opertion can be converted to a ReLU |
| 1336 | op.type = Op.Relu |
| 1337 | op.name = op.name.replace("LeakyRelu", op.type.name) |
| 1338 | return op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1339 | if ifm.dtype in (DataType.uint8, DataType.int8) and ifm.dtype == ofm.dtype: |
| 1340 | # use LUT for int8/uint8 |
| 1341 | return convert_lrelu_to_lut(op, arch) |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1342 | if check_quantized_tens_scaling_equal(ifm, ofm) and ifm.dtype == ofm.dtype == DataType.int16 and alpha > 0: |
Fredrik Svedberg | 701ba91 | 2022-09-07 16:01:15 +0200 | [diff] [blame] | 1343 | # use LeakyRelu unmodified for int16 with equal input/output scaling and positive alpha |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1344 | return op |
| 1345 | return convert_lrelu_to_mul_max(op, arch) |
| 1346 | |
| 1347 | |
| 1348 | def convert_tanh_sigmoid_to_lut(op, arch, nng): |
| 1349 | # Converts int8/uint8 Sigmoid and Tanh to a LUT based solution |
| 1350 | if op.type == Op.Sigmoid: |
| 1351 | return convert_to_lut8(op, clamp_sigmoid, "sigmoid") |
| 1352 | elif op.type == Op.Tanh: |
| 1353 | return convert_to_lut8(op, math.tanh, "tanh") |
| 1354 | return op |
| 1355 | |
| 1356 | |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 1357 | def remove_memory_only_ops(op, arch): |
| 1358 | if op.run_on_npu and op.type in memory_only_ops: |
| 1359 | bypass_memory_only_ops(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1360 | |
| 1361 | |
| 1362 | def fuse_activation_function_with_prev(op, arch, nng): |
| 1363 | # if op is a no-op: attempts to move the activation function to the preceding op |
| 1364 | if not op.attrs.get("is_nop", False) or op.activation is None: |
| 1365 | return op |
| 1366 | ifm, ofm = op.get_ifm_ofm() |
| 1367 | if ifm is None or ofm is None: |
| 1368 | return op |
| 1369 | # finds the input(s) to the operation |
| 1370 | prev_op = ifm.ops[0] |
| 1371 | # Note: the below checks on prev_op require that a first optimize pass on the full graph has been performed |
| 1372 | fuse = ( |
| 1373 | prev_op.run_on_npu |
| 1374 | and prev_op.type.npu_block_type != NpuBlockType.Default |
| 1375 | and len(ifm.ops) == 1 |
| 1376 | and len(prev_op.outputs[0].consumers()) == 1 |
| 1377 | and prev_op.activation is None |
| 1378 | ) |
| 1379 | if op.activation_lut is not None and arch.shram_reserved_unused_banks == 0: |
| 1380 | # TODO: if SHRAM LUT space is shared with SHRAM ACC (32, 64 MAC), |
| 1381 | # LUT currently only works correctly for elementwise ops |
| 1382 | fuse = False |
| 1383 | if not fuse: |
| 1384 | return op |
| 1385 | # Move the fused activation function + corresponding info to prev_op |
| 1386 | prev_op.activation = op.activation |
| 1387 | prev_op.forced_output_quantization = op.forced_output_quantization |
| 1388 | if op.activation_lut is not None: |
| 1389 | prev_op.set_activation_lut(op.activation_lut) |
| 1390 | # Bypass op |
| 1391 | prev_op.set_output_tensor(ofm) |
| 1392 | DebugDatabase.add_optimised(op, prev_op) |
| 1393 | return op |
| 1394 | |
| 1395 | |
| 1396 | def _leading_pad_ok(leading_pad, stride, kernel_size): |
| 1397 | # If kernel size // 2 > stride, then (left, top) padding must be a multiple of stride, |
| 1398 | # otherwise replacing PAD by hardware padding would iterate the wrong IFM rows/columns |
| 1399 | max_size = kernel_size // 2 |
| 1400 | return leading_pad == max_size or max_size <= stride or leading_pad % stride == 0 |
| 1401 | |
| 1402 | |
| 1403 | def replace_pad_by_hw_pad(op: Operation, arch, nng): |
| 1404 | """ |
| 1405 | Tries to completely remove a PAD operator by using hardware padding. |
| 1406 | E.g. a PAD operation that pads 1, followed by a CONV with VALID padding and kernel size 3 |
| 1407 | is rewritten such that the PAD is removed, and the CONV uses SAME padding. |
| 1408 | Converts tens1 -> PAD -> tens2 -> CONV to tens1 -> CONV |
| 1409 | if both operations can be run on the NPU. |
| 1410 | This is the most efficient way to implement PAD, but cannot be done for all pad sizes. |
| 1411 | """ |
| 1412 | if ( |
| 1413 | (op.type.is_conv2d_op() or op.type.is_depthwise_conv2d_op() or op.type.is_avgpool_op()) |
Tim Hall | 0ab2edc | 2022-02-23 17:58:02 +0000 | [diff] [blame] | 1414 | and op.type not in (Op.Conv2DBackpropInput, Op.Conv2DBackpropInputSwitchedBias) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1415 | and op.run_on_npu |
| 1416 | and op.attrs["padding"] == Padding.VALID |
| 1417 | ): |
| 1418 | pad_op = op.ifm.ops[0] |
| 1419 | if pad_op.type != Op.Pad or not pad_op.run_on_npu: |
| 1420 | return op |
| 1421 | if pad_op.ifm.dtype != pad_op.ofm.dtype or not check_quantized_tens_scaling_equal(pad_op.ofm, pad_op.ifm): |
| 1422 | return op |
| 1423 | top, left, bottom, right = get_pad_values_from_input(pad_op.inputs[1].values) |
| 1424 | k = op.kernel |
| 1425 | k_w, k_h = k.dilated_wh() |
| 1426 | |
| 1427 | # Check if the PAD operator can be replaced by hardware padding |
| 1428 | if left > k_w // 2 or right > k_w // 2 or top > k_h // 2 or bottom > k_h // 2: |
| 1429 | # Too much padding, it would require hardware padding to actually insert zeros |
| 1430 | return op |
| 1431 | if not _leading_pad_ok(top, k.stride.y, k_h) or not _leading_pad_ok(left, k.stride.x, k_w): |
| 1432 | return op |
| 1433 | |
| 1434 | if op.type.is_avgpool_op(): |
| 1435 | # For average pool, hardware padding can only be used if padding is 0 or kernel size / 2 |
| 1436 | for pad, k_size in ( |
| 1437 | (left, k_w), |
| 1438 | (right, k_w), |
| 1439 | (top, k_h), |
| 1440 | (bottom, k_h), |
| 1441 | ): |
| 1442 | if pad not in (0, k_size // 2): |
| 1443 | return op |
| 1444 | # Average pool is converted to depthwise, because NPU average pool + same padding |
| 1445 | # has a special implementation that is different from PAD followed by average pool with |
| 1446 | # valid padding. |
| 1447 | k_w, k_h = op.kernel.width, op.kernel.height |
| 1448 | ifm = op.ifm |
| 1449 | # Remember other inputs |
| 1450 | other_inputs = op.inputs[1:] |
| 1451 | # Create a weight tensor, all weights are set to 1/(kernel width * kernel height) |
| 1452 | quantization = QuantizationParameters(0.0, 255.0) |
| 1453 | quantization.scale_f32 = 1.0 / (k_w * k_h) |
| 1454 | quantization.zero_point = 0 |
| 1455 | shape = [k_h, k_w, 1, op.ofm.shape[-1]] |
| 1456 | weights = np.full(shape, 1) |
| 1457 | |
| 1458 | weight_tens = create_const_tensor( |
| 1459 | op.name + "_weights", |
| 1460 | shape, |
| 1461 | op.ifm.dtype, |
| 1462 | weights, |
| 1463 | np.uint8, |
| 1464 | purpose=TensorPurpose.Weights, |
| 1465 | quantization=quantization, |
| 1466 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1467 | weight_tens.values = weights |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1468 | op.type = Op.DepthwiseConv2DBias |
| 1469 | op.inputs = [] |
| 1470 | op.add_input_tensor(ifm) |
| 1471 | op.add_input_tensor(weight_tens) |
| 1472 | # Add bias tensor, all biases set to 0 |
| 1473 | op.inputs.append(None) |
Fredrik Svedberg | cc219be | 2022-09-20 16:32:52 +0200 | [diff] [blame] | 1474 | fixup_bias_tensors(op, arch, nng, DataType.int32) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1475 | # Add other inputs |
| 1476 | op.inputs.extend(other_inputs) |
| 1477 | op.rounding_mode = NpuRoundingMode.NATURAL |
| 1478 | |
| 1479 | # Bypass the PAD operator |
| 1480 | op.set_input_tensor(pad_op.ifm, 0) |
| 1481 | # Adjust the padding attributes of the convolution operator |
| 1482 | op.attrs["padding"] = Padding.EXPLICIT |
| 1483 | op.attrs["explicit_padding"] = (top, left, bottom, right) |
| 1484 | op.set_ifm_ofm_shapes() |
| 1485 | return op |
| 1486 | |
| 1487 | |
| 1488 | def convert_pad(op: Operation, arch, nng): |
| 1489 | """ |
| 1490 | Rewrites PAD operator to an average pool that copies the IFM to the OFM |
| 1491 | + up to 4 average pool operators that fill the OFM with zeros at the borders. |
| 1492 | This is done as fall-back for the PAD operators that remain after replace_pad_by_hw_pad |
| 1493 | """ |
| 1494 | if op.type != Op.Pad or not op.run_on_npu: |
| 1495 | return op |
| 1496 | top, left, bottom, right = get_pad_values_from_input(op.inputs[1].values) |
| 1497 | |
| 1498 | ifm = op.ifm |
| 1499 | assert ifm is not None |
James Ward | 3e13434 | 2021-10-28 10:01:40 +0100 | [diff] [blame] | 1500 | ifm_shape = op.ifm_shapes[0] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1501 | ofm = op.ofm |
| 1502 | assert ofm is not None |
| 1503 | ofm.ops = [] |
| 1504 | ofm_shape = op.ofm_shapes[0] |
| 1505 | |
| 1506 | # Average pool op that copies IFM to the right place inside the OFM |
| 1507 | shp0 = Shape4D(0, 0, 0, 0) |
| 1508 | shp_top = shp0.with_height(top) |
| 1509 | avgpool_op = create_avg_pool_for_concat(op, op.name + "_main", ifm, ifm_shape, shp_top.with_width(left)) |
| 1510 | avgpool_op.activation = op.activation |
| 1511 | quant = ofm.quantization |
| 1512 | pad_value = quant.zero_point |
| 1513 | # Add operations that fill the borders of the OFM |
| 1514 | if top > 0: |
| 1515 | shape = Shape4D(1, top, ofm_shape.width, ofm_shape.depth) |
| 1516 | zero_tens = create_const_tensor( |
| 1517 | op.name + "_top", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1518 | ) |
| 1519 | # If top/bottom or left/right are equal, the const tensors can be allocated to the same address |
| 1520 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1521 | create_avg_pool_for_concat(op, op.name + "_top", zero_tens, shape, shp0) |
| 1522 | if bottom > 0: |
| 1523 | shape = Shape4D(1, bottom, ofm_shape.width, ofm_shape.depth) |
| 1524 | zero_tens = create_const_tensor( |
| 1525 | op.name + "_bottom", |
| 1526 | shape.as_list(), |
| 1527 | ofm.dtype, |
| 1528 | shape.elements() * [pad_value], |
| 1529 | np.uint8, |
| 1530 | quantization=quant, |
| 1531 | ) |
| 1532 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1533 | create_avg_pool_for_concat( |
| 1534 | op, op.name + "_bottom", zero_tens, shape, shp0.with_height(ofm_shape.height - bottom) |
| 1535 | ) |
| 1536 | if left > 0: |
| 1537 | shape = Shape4D(1, ifm_shape.height, left, ofm_shape.depth) |
| 1538 | zero_tens = create_const_tensor( |
| 1539 | op.name + "_left", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1540 | ) |
| 1541 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1542 | create_avg_pool_for_concat(op, op.name + "_left", zero_tens, shape, shp_top) |
| 1543 | if right > 0: |
| 1544 | shape = Shape4D(1, ifm_shape.height, right, ofm_shape.depth) |
| 1545 | zero_tens = create_const_tensor( |
| 1546 | op.name + "_right", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1547 | ) |
| 1548 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1549 | create_avg_pool_for_concat( |
| 1550 | op, op.name + "_right", zero_tens, shape, shp_top.with_width(ofm_shape.width - right) |
| 1551 | ) |
| 1552 | |
| 1553 | op.type = Op.ConcatTFLite |
| 1554 | return avgpool_op |
| 1555 | |
| 1556 | |
Fredrik Svedberg | cc219be | 2022-09-20 16:32:52 +0200 | [diff] [blame] | 1557 | def fixup_bias_tensors(op, arch, nng, dtype=None): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1558 | if op.type.needs_bias() and op.bias is None: |
| 1559 | # Op has no bias, add bias tensor filled with zeros |
| 1560 | nr_biases = op.inputs[1].shape[-1] |
| 1561 | bias_values = [0] * nr_biases |
Fredrik Svedberg | cc219be | 2022-09-20 16:32:52 +0200 | [diff] [blame] | 1562 | # The DataType of the bias tensor can be explicitly provided or deduced from the ifm |
| 1563 | # DataType. Default is int32 bias for 8-bit ifms and int64 for int16 ifms. |
| 1564 | # For int16 the selected bias DataType will have an impact on the scaling |
| 1565 | # used when encoding the scales and biases later. The default mode will match the |
| 1566 | # refence with reduced scaling for int64 bias. |
| 1567 | # This means that in cases (in the graph optimiser) where DepthwiseConv2DBias |
| 1568 | # is used to emulate average pool int32 bias should be selected for full precision |
| 1569 | # int16 scaling. |
| 1570 | if dtype is None: |
| 1571 | dtype = DataType.int64 if op.ifm.dtype == DataType.int16 else DataType.int32 |
| 1572 | bias_tensor = create_const_tensor(op.name + "_bias", [nr_biases], dtype, bias_values) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1573 | op.set_input_tensor(bias_tensor, op.type.info.indices.biases[0]) |
| 1574 | |
| 1575 | return op |
| 1576 | |
| 1577 | |
Fredrik Svedberg | cc8569f | 2021-11-01 14:25:29 +0100 | [diff] [blame] | 1578 | def fixup_asymmetric_weights(op, arch, nng): |
| 1579 | if op.run_on_npu and (op.type.is_conv2d_op() or op.type.is_depthwise_conv2d_op()): |
| 1580 | if op.ifm.dtype == DataType.int8: |
| 1581 | if not np.all(op.weights.quantization.zero_point == 0): |
| 1582 | print(f"Warning: {op.type} '{op.name}' has asymmetric weights, zero points have been adjusted.") |
| 1583 | op.weights.quantization.zero_point *= 0 |
| 1584 | |
| 1585 | return op |
| 1586 | |
| 1587 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1588 | def convert_mean_to_depthwise_conv_or_avgpool(op, arch, nng): |
| 1589 | if op.type == Op.Mean and op.run_on_npu: |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1590 | inp, axis = op.inputs |
| 1591 | shape = inp.shape |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1592 | ofm_shape = op.ofm.shape |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1593 | dims = len(shape) |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1594 | dims_ofm = len(ofm_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1595 | |
| 1596 | # Height and width axes have different index depending on dimensions |
| 1597 | if axis.shape == [] or axis.shape[0] == 1: # single axis |
| 1598 | axis = int(axis.values) if len(axis.shape) == 0 else int(axis.values[0]) |
| 1599 | if dims in (2, 3): |
| 1600 | if axis == 0: |
| 1601 | h, w = shape[axis], 1 |
| 1602 | else: |
| 1603 | h, w = 1, shape[axis] |
| 1604 | else: |
| 1605 | if axis == 1: |
| 1606 | h, w = shape[axis], 1 |
| 1607 | else: |
| 1608 | h, w = 1, shape[axis] |
| 1609 | else: # multiple axes |
| 1610 | axis = sorted(axis.values) |
| 1611 | h, w = [shape[i] for i in axis] |
| 1612 | |
| 1613 | # Set necessary depthwise attributes |
| 1614 | op.attrs.update( |
| 1615 | { |
| 1616 | "padding": Padding.VALID, |
| 1617 | "stride_h": 1, |
| 1618 | "stride_w": 1, |
| 1619 | "strides": (1, 1, 1, 1), |
| 1620 | "depth_multiplier": 1, |
| 1621 | "channel_multiplier": 1, |
| 1622 | "dilation_h_factor": 1, |
| 1623 | "dilation_w_factor": 1, |
| 1624 | "dilation": (1, 1, 1, 1), |
| 1625 | } |
| 1626 | ) |
| 1627 | # Change op type |
| 1628 | op.type = Op.DepthwiseConv2DBias |
| 1629 | # Set IFM/OFM shapes after changing op type |
| 1630 | op.set_ifm_ofm_shapes() |
| 1631 | |
Fredrik Svedberg | 1e5456f | 2022-09-23 15:25:17 +0200 | [diff] [blame] | 1632 | weight_scale, bias = 1, 0 |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1633 | ofmq, ifmq = op.ofm.quantization, inp.quantization |
Johan Alfvén | 9d51ec4 | 2022-10-27 16:30:01 +0200 | [diff] [blame] | 1634 | if ifmq.is_scaling_equal(ofmq): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1635 | # Here we can just use a simple AvgPool with truncating rounding, |
| 1636 | # as we're emulating simple integer division. |
| 1637 | op.rounding_mode = NpuRoundingMode.TRUNCATE |
| 1638 | op.type = Op.AvgPool |
| 1639 | op.attrs.update({"ksize": (1, h, w, 1), "filter_height": h, "filter_width": w}) |
| 1640 | else: |
| 1641 | op.rounding_mode = NpuRoundingMode.NATURAL |
| 1642 | weight_scale = 1 / (h * w) |
| 1643 | # Input zero point is adjusted after mean calculation, so we emulate that with a bias |
| 1644 | bias = -ifmq.zero_point * h * w |
| 1645 | fiq = ifmq.clone() |
| 1646 | fiq.zero_point = 0 |
| 1647 | op.forced_input_quantization = fiq |
| 1648 | |
| 1649 | # Change dimensions to 4 |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1650 | def extend_dims(dim, in_shape): |
| 1651 | if dim < 4: |
| 1652 | in_shape = [1] + in_shape |
| 1653 | if dim == 2: |
| 1654 | in_shape += [1] |
| 1655 | return in_shape |
| 1656 | |
| 1657 | if dims < 4 or dims_ofm < 4: |
| 1658 | # Fix the ofm dimension when keep_dims is false |
| 1659 | # e.g. IFM=1xHxWxC axis=2 OFM=1xHxC, the ofm_shape should be 1xHx1xC, not 1x1xHxC |
| 1660 | if isinstance(axis, int) and dims_ofm + 1 == dims: |
| 1661 | ofm_shape.insert(axis, 1) |
| 1662 | elif isinstance(axis, list) and (dims_ofm + len(axis) == dims): |
| 1663 | for i in axis: |
| 1664 | ofm_shape.insert(i, 1) |
| 1665 | shape = extend_dims(dims, shape) |
| 1666 | dims_ofm = len(ofm_shape) |
| 1667 | ofm_shape = extend_dims(dims_ofm, ofm_shape) |
| 1668 | op.set_ifm_ofm_shapes() |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1669 | |
Rickard Bolin | 7d7cb67 | 2021-12-07 09:09:14 +0000 | [diff] [blame] | 1670 | # If height is greater than max kernel height, reshape from HxW to 1x(HxW) |
Johan Alfvén | e84ed6b | 2022-09-26 13:46:51 +0200 | [diff] [blame] | 1671 | weight_shape = None |
Rickard Bolin | 7d7cb67 | 2021-12-07 09:09:14 +0000 | [diff] [blame] | 1672 | if (h > 64 and op.type == Op.DepthwiseConv2DBias) or (h > 256 and op.type == Op.AvgPool): |
Johan Alfvén | e84ed6b | 2022-09-26 13:46:51 +0200 | [diff] [blame] | 1673 | # This can only happen and be done for multiple axes, and |
| 1674 | # h * w <= 256 for DepthwiseConv2DBias |
| 1675 | # h * w <= 4096 for AvgPool |
| 1676 | # which is checked in supported ops |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1677 | shape = [shape[0], 1, h * w, shape[3]] |
| 1678 | op.ifm_shapes[0] = Shape4D(shape) |
Johan Alfvén | e84ed6b | 2022-09-26 13:46:51 +0200 | [diff] [blame] | 1679 | weight_shape = [1, h * w, shape[3], shape[0]] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1680 | if h > 256 and op.type == Op.AvgPool: |
| 1681 | op.attrs.update({"ksize": (1, 1, h * w, 1), "filter_height": 1, "filter_width": h * w}) |
| 1682 | |
| 1683 | # If the AvgPool version is used, we don't need to do anything else |
| 1684 | if op.type == Op.AvgPool: |
| 1685 | return op |
| 1686 | |
| 1687 | # Make unit weight tensor quantization |
| 1688 | weight_quant = ifmq.clone() |
| 1689 | weight_quant.min = 0 |
| 1690 | weight_quant.max = 255 |
| 1691 | weight_quant.scale_f32 = weight_scale |
| 1692 | weight_quant.zero_point = 0 |
| 1693 | |
Johan Alfvén | e84ed6b | 2022-09-26 13:46:51 +0200 | [diff] [blame] | 1694 | if weight_shape is None: |
| 1695 | # Set weight shape to [H,W,C,B] |
| 1696 | weight_shape = [h, w, shape[3], shape[0]] |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1697 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1698 | # Add unit weight tensor |
| 1699 | op.set_input_tensor( |
| 1700 | create_const_tensor( |
| 1701 | "weights", |
| 1702 | weight_shape, |
| 1703 | inp.dtype, |
| 1704 | np.ones(weight_shape), |
| 1705 | value_dtype=np.uint8, |
| 1706 | quantization=weight_quant, |
| 1707 | ), |
| 1708 | 1, |
| 1709 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1710 | op.weights.values = np.reshape(op.inputs[1].values, weight_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1711 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1712 | # Add bias tensor |
Fredrik Svedberg | 1e5456f | 2022-09-23 15:25:17 +0200 | [diff] [blame] | 1713 | bias_shape = [shape[-1]] |
| 1714 | op.inputs.append(create_const_tensor("bias", bias_shape, DataType.int32, np.ones(bias_shape) * bias)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1715 | |
| 1716 | return op |
| 1717 | |
| 1718 | |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1719 | def optimise_quantize(op: Operation, arch, nng): |
| 1720 | |
| 1721 | if op.type == Op.Quantize and op.run_on_npu: |
| 1722 | |
| 1723 | ifm, ofm = op.get_ifm_ofm() |
| 1724 | input_values = ifm.values |
| 1725 | |
| 1726 | # Guard clause - input not const or no values to quantize |
| 1727 | if ifm.ops[0].type != Op.Const or input_values is None: |
| 1728 | return op |
| 1729 | |
| 1730 | # Singular val in numpy array, convert to indexable array |
| 1731 | if input_values.ndim == 0: |
| 1732 | input_values = np.array([input_values]) |
| 1733 | |
Fredrik Svedberg | 1156317 | 2022-07-06 14:54:12 +0200 | [diff] [blame] | 1734 | # requantized int8 to int8 or int16 to int16 |
| 1735 | if ifm.dtype == ofm.dtype == DataType.int8 or ifm.dtype == ofm.dtype == DataType.int16: |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1736 | |
| 1737 | # scale needs to use double precision to match TFLite reference kernel |
| 1738 | effective_scale = np.float64(ifm.quantization.scale_f32) / np.float64(ofm.quantization.scale_f32) |
| 1739 | effective_multiplier, effective_shift = quantise_scale(effective_scale) |
| 1740 | |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1741 | requantized_vals = [] |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1742 | for val in input_values.flatten(): |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1743 | input_val = val - ifm.quantization.zero_point |
| 1744 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1745 | ofm_val = fp_math.multiply_by_quantized_multiplier(input_val, effective_multiplier, effective_shift) |
| 1746 | ofm_val += ofm.quantization.zero_point |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1747 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1748 | clamped_ofm_value = max(min(ofm_val, ofm.quantization.quant_max), ofm.quantization.quant_min) |
| 1749 | requantized_vals.append(clamped_ofm_value) |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1750 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1751 | ofm.values = np.array(requantized_vals, ofm.dtype.as_numpy_type()) |
| 1752 | ofm.values.shape = input_values.shape |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1753 | |
| 1754 | # Case: Float input - quantize to int |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1755 | elif ifm.dtype.type == BaseType.Float: |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1756 | |
| 1757 | quantized_vals = [] |
| 1758 | for val in input_values: |
| 1759 | |
| 1760 | # Derive quantized value |
| 1761 | quant_val = (val / ofm.quantization.scale_f32) + ofm.quantization.zero_point |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1762 | clamped_quantized_val = np.clip(quant_val, ofm.quantization.quant_min, ofm.quantization.quant_max) |
| 1763 | quantized_vals.append(clamped_quantized_val) |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1764 | |
| 1765 | # Pass the statically calculated quant val to output tensor |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1766 | ofm.values = np.array(quantized_vals, ofm.dtype.as_numpy_type()) |
| 1767 | |
| 1768 | # Unsupported data type |
| 1769 | else: |
| 1770 | return op |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1771 | |
| 1772 | # Make quantize op const and disconnect from parent node |
| 1773 | |
| 1774 | # Remove reference of the current quant op from the parent tensor's consumer list |
| 1775 | ifm.consumer_list = [consumer for consumer in ifm.consumer_list if consumer.op_index != op.op_index] |
| 1776 | |
| 1777 | # Clear any references to parent node |
| 1778 | op.inputs = [] |
| 1779 | |
| 1780 | # Convert this quantize op to const |
| 1781 | op.type = Op.Const |
| 1782 | |
| 1783 | return op |
| 1784 | |
| 1785 | |
Ayaan Masood | 4965fae | 2022-06-29 11:30:57 +0100 | [diff] [blame] | 1786 | def convert_shape_op_to_constant_tensor(op: Operation, arch, nng): |
| 1787 | """Static optimisation for SHAPE operator output value known at compile time""" |
| 1788 | |
| 1789 | # Disconnect SHAPE operator from its parent and transform SHAPE OP into constant |
| 1790 | |
| 1791 | if op.type == Op.Shape and op.run_on_npu: |
| 1792 | |
| 1793 | ifm, ofm = op.get_ifm_ofm() |
| 1794 | |
| 1795 | if len(ifm.shape) != ofm.shape[0]: |
| 1796 | return op |
| 1797 | |
| 1798 | # Remove reference of the current shape op from the parent tensor's consumer list |
| 1799 | ifm.consumer_list = [consumer for consumer in ifm.consumer_list if consumer.op_index != op.op_index] |
| 1800 | |
| 1801 | # Clear any references to parent node |
| 1802 | op.inputs = [] |
| 1803 | |
| 1804 | # Convert this SHAPE op to const |
| 1805 | op.type = Op.Const |
Fredrik Svedberg | f3c7d55 | 2022-11-04 09:48:49 +0100 | [diff] [blame] | 1806 | DebugDatabase.add_optimised(op, op) |
Ayaan Masood | 4965fae | 2022-06-29 11:30:57 +0100 | [diff] [blame] | 1807 | |
| 1808 | # Add size calculation to shape output tensors |
| 1809 | ofm.values = np.array(ifm.shape) |
| 1810 | |
| 1811 | return op |
| 1812 | |
| 1813 | |
Tim Hall | ea4ba66 | 2022-11-11 18:19:53 +0000 | [diff] [blame] | 1814 | def fixup_dilation_gt2(op, arch, nng): |
| 1815 | assert op.run_on_npu |
| 1816 | if op.type == Op.Conv2DBias or op.type == Op.DepthwiseConv2DBias: |
| 1817 | dilation_w, dilation_h = op.get_kernel_dilation() |
| 1818 | |
| 1819 | # if dilation in either axis is greater than that supported by the hardware then we must manually dilate the |
| 1820 | # kernel |
| 1821 | if dilation_w > 2 or dilation_h > 2: |
| 1822 | kernel_w, kernel_h = op.get_kernel_size() |
| 1823 | kernel_ic = op.weights.shape[-2] |
| 1824 | kernel_oc = op.weights.shape[-1] |
| 1825 | |
| 1826 | # if the dilation is a multiple of 2 then the hardware dialtion can be enabled to provide that multiple |
| 1827 | # of 2. this allows the kernel size to be reduced (via the scaled dilation) by half in that dimension. |
| 1828 | # odd = 1, even = 2 |
| 1829 | hw_dilation_h = 1 if (dilation_h & 1) else 2 |
| 1830 | hw_dilation_w = 1 if (dilation_w & 1) else 2 |
| 1831 | |
| 1832 | scale_dilation_h = dilation_h // hw_dilation_h |
| 1833 | scale_dilation_w = dilation_w // hw_dilation_w |
| 1834 | |
| 1835 | # create new empty kernel (HWIO format) |
| 1836 | new_kernel_h = (kernel_h - 1) * scale_dilation_h + 1 |
| 1837 | new_kernel_w = (kernel_w - 1) * scale_dilation_w + 1 |
| 1838 | |
| 1839 | new_kernel_shape = [new_kernel_h, new_kernel_w, kernel_ic, kernel_oc] |
| 1840 | new_kernel_values = np.zeros(new_kernel_shape, dtype=op.weights.values.dtype) |
| 1841 | |
| 1842 | # copy the original kernel values into the new sparse kernel |
| 1843 | for h in range(0, kernel_h): |
| 1844 | for w in range(0, kernel_w): |
| 1845 | new_h = h * scale_dilation_h |
| 1846 | new_w = w * scale_dilation_w |
| 1847 | new_kernel_values[new_h, new_w, :, :] = op.weights.values[h, w, :, :] |
| 1848 | |
| 1849 | # update the weight tensor with the new dilated kernel |
| 1850 | op.weights.shape = new_kernel_shape |
| 1851 | op.weights.values = new_kernel_values |
| 1852 | |
| 1853 | # enable(=2) / disable(=1) hardware dilation |
| 1854 | op.attrs["dilation"] = (1, hw_dilation_h, hw_dilation_w, 1) # nhwc format |
| 1855 | op.attrs["dilation_h_factor"] = hw_dilation_h |
| 1856 | op.attrs["dilation_w_factor"] = hw_dilation_w |
| 1857 | |
| 1858 | return op |
| 1859 | |
| 1860 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1861 | def supported_operator_check(op, arch, nng): |
Jonas Ohlsson | 45e653d | 2021-07-26 16:13:12 +0200 | [diff] [blame] | 1862 | op.run_on_npu = arch.tflite_supported_operators.is_operator_supported(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1863 | return op |
| 1864 | |
| 1865 | |
| 1866 | def tflite_optimise_graph(nng, arch): |
Fredrik Svedberg | 1156317 | 2022-07-06 14:54:12 +0200 | [diff] [blame] | 1867 | # Compile time static optimisations |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1868 | optimisation_list = [optimise_quantize, convert_shape_op_to_constant_tensor] |
| 1869 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1870 | for idx, sg in enumerate(nng.subgraphs): |
| 1871 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1872 | nng, |
| 1873 | sg, |
| 1874 | arch, |
| 1875 | [], |
Ayaan Masood | 4965fae | 2022-06-29 11:30:57 +0100 | [diff] [blame] | 1876 | optimisation_list, |
| 1877 | rewrite_unsupported=False, |
| 1878 | ) |
| 1879 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1880 | # Pre-processing step |
| 1881 | pre_process_list = [ |
| 1882 | supported_operator_check, |
| 1883 | set_ifm_ofm_op_shapes, |
| 1884 | ] |
| 1885 | |
Ayaan Masood | 4965fae | 2022-06-29 11:30:57 +0100 | [diff] [blame] | 1886 | for idx, sg in enumerate(nng.subgraphs): |
| 1887 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1888 | nng, |
| 1889 | sg, |
| 1890 | arch, |
| 1891 | [], |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1892 | pre_process_list, |
| 1893 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1894 | ) |
| 1895 | |
| 1896 | # Handle Concat Ops |
| 1897 | for idx, sg in enumerate(nng.subgraphs): |
| 1898 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [rewrite_concat_ops]) |
| 1899 | sg.refresh_after_modification() |
| 1900 | |
| 1901 | # Handle Split Ops |
| 1902 | for idx, sg in enumerate(nng.subgraphs): |
| 1903 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1904 | nng, |
| 1905 | sg, |
| 1906 | arch, |
| 1907 | [], |
| 1908 | [rewrite_unpack_output, rewrite_stridedslice_output, convert_nop_split_to_identity], |
| 1909 | rewrite_unsupported=False, |
| 1910 | ) |
| 1911 | |
| 1912 | for idx, sg in enumerate(nng.subgraphs): |
| 1913 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1914 | nng, |
| 1915 | sg, |
| 1916 | arch, |
| 1917 | [rewrite_split_ops], |
| 1918 | [], |
| 1919 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1920 | ) |
| 1921 | |
| 1922 | # Handle sg input output |
| 1923 | for idx, sg in enumerate(nng.subgraphs): |
| 1924 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1925 | nng, |
| 1926 | sg, |
| 1927 | arch, |
| 1928 | [], |
| 1929 | [fix_sg_input_output], |
| 1930 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1931 | ) |
| 1932 | |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 1933 | # Removal of memory only operators |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1934 | for sg in nng.subgraphs: |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 1935 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [remove_memory_only_ops]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1936 | sg.refresh_after_modification() |
| 1937 | |
| 1938 | # Rewrite of operators |
| 1939 | op_rewrite_list = [ |
| 1940 | set_tensor_equivalence, |
| 1941 | convert_mean_to_depthwise_conv_or_avgpool, |
| 1942 | convert_depthwise_to_conv, |
| 1943 | convert_conv_to_fc, |
| 1944 | convert_softmax, |
Fredrik Svedberg | 8ddd489 | 2022-08-19 16:06:04 +0200 | [diff] [blame] | 1945 | convert_prelu, |
Fredrik Svedberg | 3642431 | 2022-09-16 09:39:26 +0200 | [diff] [blame] | 1946 | convert_mul_max_to_abs_or_lrelu, |
| 1947 | convert_lrelu, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1948 | optimise_strided_conv, |
| 1949 | convert_hardswish_to_lut, |
| 1950 | rewrite_fully_connected_input, |
| 1951 | convert_batched_fc_shape, |
| 1952 | fixup_conv2d_backprop, |
| 1953 | fixup_relus_with_differing_ifm_ofm_scaling, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1954 | reorder_depthwise_weights, |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 1955 | fixup_resize, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1956 | fixup_bias_tensors, |
Fredrik Svedberg | cc8569f | 2021-11-01 14:25:29 +0100 | [diff] [blame] | 1957 | fixup_asymmetric_weights, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1958 | convert_tanh_sigmoid_to_lut, |
| 1959 | replace_pad_by_hw_pad, |
Tim Hall | ea4ba66 | 2022-11-11 18:19:53 +0000 | [diff] [blame] | 1960 | fixup_dilation_gt2, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1961 | ] |
| 1962 | |
| 1963 | for idx, sg in enumerate(nng.subgraphs): |
| 1964 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1965 | nng, |
| 1966 | sg, |
| 1967 | arch, |
| 1968 | [], |
| 1969 | op_rewrite_list, |
| 1970 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1971 | ) |
| 1972 | |
| 1973 | for idx, sg in enumerate(nng.subgraphs): |
| 1974 | # remove passthrough tensors and attempt further optimizations |
| 1975 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1976 | nng, |
| 1977 | sg, |
| 1978 | arch, |
| 1979 | [remove_passthrough_tensor], |
| 1980 | [fuse_activation_function_with_prev, convert_pad, add_padding_fields], |
| 1981 | ) |
| 1982 | |
| 1983 | # Removal of SplitSliceRead, need to be done after optimisation has been performed, |
| 1984 | # since ifm/ofm_shapes are of importance to this function |
| 1985 | for sg in nng.subgraphs: |
| 1986 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [remove_SplitSliceRead]) |
| 1987 | sg.refresh_after_modification() |
| 1988 | |
Fredrik Svedberg | f3c7d55 | 2022-11-04 09:48:49 +0100 | [diff] [blame] | 1989 | # Make sure that const optimisations on subgraph outputs are handled correctly |
| 1990 | for sg in nng.subgraphs: |
| 1991 | for ofm in sg.output_tensors: |
| 1992 | if ofm.is_const and ofm.ops[0].type_changed: |
| 1993 | # Subgraph output cannot be const - insert a memory copy |
| 1994 | op = ofm.ops[0] |
| 1995 | ofm_clone = ofm.clone() |
| 1996 | ofm_clone.values = ofm.values |
| 1997 | ofm.values = None |
| 1998 | np_dtype = ofm.dtype.as_numpy_type() |
| 1999 | zero = create_const_tensor("zero", [1], ofm.dtype, [0], np_dtype, quantization=ofm.quantization) |
| 2000 | memcpy = create_add_nop(f"{ofm.name}_copy") |
| 2001 | memcpy.add_input_tensor(ofm_clone) |
| 2002 | memcpy.add_input_tensor(zero) |
| 2003 | memcpy.set_output_tensor(ofm) |
| 2004 | memcpy.set_ifm_ofm_shapes() |
| 2005 | op.set_output_tensor(ofm_clone) |
| 2006 | DebugDatabase.add_optimised(op, memcpy) |
| 2007 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 2008 | return nng |