Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1 | # Copyright (C) 2020-2021 Arm Limited or its affiliates. All rights reserved. |
| 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. |
| 16 | # Description: |
| 17 | # Early optimisation of a TensorFlow Lite based network graph, using the rewrite_graph module |
| 18 | # to do the traversal of the graph. |
| 19 | import math |
| 20 | import uuid |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 21 | |
| 22 | import numpy as np |
| 23 | |
| 24 | from . import fp_math |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 25 | from . import rewrite_graph |
| 26 | from . import scaling |
| 27 | from .api import NpuRoundingMode |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 28 | from .data_type import BaseType |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 29 | from .data_type import DataType |
| 30 | from .debug_database import DebugDatabase |
| 31 | from .errors import UnsupportedFeatureError |
| 32 | from .ethos_u55_regs.ethos_u55_regs import resampling_mode |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 33 | from .graph_optimiser_util import bypass_memory_only_ops |
Patrik Gustavsson | c74682c | 2021-08-17 14:26:38 +0200 | [diff] [blame] | 34 | from .graph_optimiser_util import calc_explicit_padding |
Patrik Gustavsson | df99510 | 2021-08-23 15:33:59 +0200 | [diff] [blame] | 35 | from .graph_optimiser_util import convert_depthwise_to_conv |
Patrik Gustavsson | f436ada | 2021-09-14 14:56:48 +0200 | [diff] [blame] | 36 | from .graph_optimiser_util import convert_to_lut |
Patrik Gustavsson | df99510 | 2021-08-23 15:33:59 +0200 | [diff] [blame] | 37 | from .graph_optimiser_util import fix_sg_input_output |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 38 | from .graph_optimiser_util import memory_only_ops |
Patrik Gustavsson | f1580f0 | 2021-09-01 12:43:02 +0200 | [diff] [blame] | 39 | from .graph_optimiser_util import move_splitsliceread_to_consumer |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 40 | from .graph_optimiser_util import needed_total_padding |
| 41 | from .graph_optimiser_util import set_ifm_ofm_op_shapes |
| 42 | from .graph_optimiser_util import set_tensor_equivalence |
| 43 | from .numeric_util import clamp_sigmoid |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 44 | from .numeric_util import round_away_zero |
| 45 | from .operation import create_activation_function |
Fredrik Svedberg | 1a7527c | 2021-09-13 15:52:16 +0200 | [diff] [blame] | 46 | from .operation import ExplicitScaling |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 47 | from .operation import NpuBlockType |
| 48 | from .operation import Op |
| 49 | from .operation import Operation |
| 50 | from .operation import Padding |
| 51 | from .operation_util import create_avgpool_nop |
| 52 | from .operation_util import get_pad_values_from_input |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 53 | from .scaling import quantise_scale |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 54 | from .shape4d import Shape4D |
| 55 | from .softmax import SoftMax |
| 56 | from .tensor import check_quantized_tens_scaling_equal |
| 57 | from .tensor import create_const_tensor |
| 58 | from .tensor import create_equivalence_id |
| 59 | from .tensor import QuantizationParameters |
| 60 | from .tensor import Tensor |
| 61 | from .tensor import TensorPurpose |
| 62 | from .tflite_mapping import optype_to_builtintype |
| 63 | |
| 64 | passthrough_nodes = (Op.Identity,) |
| 65 | |
| 66 | |
| 67 | def create_avg_pool_for_concat(concat_op, name, ifm, ifm_shape: Shape4D, write_offset: Shape4D): |
| 68 | """Creates an average pool for the given concat op/input feature map""" |
| 69 | ofm = concat_op.ofm |
| 70 | avgpool_op = create_avgpool_nop(name) |
| 71 | avgpool_op.inputs = [ifm] |
| 72 | avgpool_op.outputs = [ofm] |
| 73 | |
| 74 | avgpool_op.write_offset = write_offset |
| 75 | avgpool_op.write_shape = ifm_shape |
| 76 | ofm.ops.append(avgpool_op) |
| 77 | DebugDatabase.add_optimised(concat_op, avgpool_op) |
| 78 | avgpool_op.ifm_shapes.append(ifm_shape) |
| 79 | avgpool_op.ofm_shapes.append(concat_op.ofm_shapes[0]) |
| 80 | avgpool_op.memory_function = Op.ConcatSliceWrite |
| 81 | return avgpool_op |
| 82 | |
| 83 | |
| 84 | def remove_passthrough_tensor(tens, arch, nng): |
| 85 | if len(tens.ops) == 1 and tens.ops[0].type in passthrough_nodes: |
| 86 | assert len(tens.ops[0].inputs) == 1 |
| 87 | tens = tens.ops[0].inputs[0] |
| 88 | return tens |
| 89 | |
| 90 | |
| 91 | def rewrite_concat_ops(op, arch): |
| 92 | if not op.run_on_npu or not op.type.is_concat_op(): |
| 93 | return |
| 94 | |
| 95 | axis_4D = 0 |
| 96 | ofm = op.ofm |
| 97 | ofm.ops = [] |
| 98 | offset = 0 |
| 99 | |
| 100 | unfuse_activation_function(op) |
| 101 | |
| 102 | if op.type == Op.Pack: |
| 103 | # Pack is also referred to as Stack |
| 104 | axis = int(op.attrs["axis"]) |
| 105 | if axis < 0: # Convert to positive axis |
| 106 | axis = len(op.inputs[0].shape) + 1 + axis |
| 107 | |
| 108 | desired_shape = op.inputs[0].shape[:axis] + [1] + op.inputs[0].shape[axis:] |
| 109 | |
| 110 | axis_4D = axis + (4 - len(desired_shape)) |
| 111 | |
| 112 | for idx, inp in enumerate(op.inputs): |
| 113 | op.ifm_shapes[idx] = Shape4D(desired_shape) |
| 114 | op.type = Op.PackReshaped |
| 115 | |
| 116 | inputs, axis = op.get_concat_inputs_axis() |
| 117 | for idx, inp in enumerate(inputs): |
| 118 | if op.type != Op.PackReshaped: |
| 119 | op.ifm_shapes[idx] = Shape4D(inp.shape) |
| 120 | if axis >= 0: |
| 121 | axis_4D = axis + (4 - len(inp.shape)) |
| 122 | else: |
| 123 | axis_4D = axis |
| 124 | write_offset = [0, 0, 0, 0] |
| 125 | write_offset[axis_4D] = offset |
| 126 | concat_end = offset + op.ifm_shapes[idx][axis_4D] |
| 127 | create_avg_pool_for_concat( |
| 128 | op, op.name + str(idx) + "_avgpool", inp, op.ifm_shapes[idx], Shape4D.from_list(write_offset) |
| 129 | ) |
| 130 | offset = concat_end |
| 131 | assert ofm.shape[axis] == offset |
| 132 | |
| 133 | return op |
| 134 | |
| 135 | |
| 136 | def rewrite_split_ops(tens, arch, nng): |
| 137 | |
| 138 | if len(tens.ops) == 1 and tens.ops[0].type.is_split_op() and tens.ops[0].type != Op.Unpack: |
| 139 | split_op = tens.ops[0] |
| 140 | |
| 141 | # Not supported so leave it and run on CPU |
| 142 | if not split_op.run_on_npu: |
| 143 | return tens |
| 144 | |
| 145 | inp, outputs, axis, offset_start, offset_end = split_op.get_split_inputs_axis() |
| 146 | |
| 147 | tens.ops = [] |
| 148 | new_op = Operation(Op.SplitSliceRead, split_op.name) |
| 149 | new_op.inputs = [inp] |
| 150 | ofm_shape_idx = 0 |
Tim Hall | 51a8dce | 2021-12-20 16:49:27 +0000 | [diff] [blame] | 151 | if None in (offset_end, offset_start): |
| 152 | read_shape = None |
| 153 | else: |
| 154 | # the read shape is relative to each start offset |
| 155 | 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] | 156 | |
| 157 | # For Split the offset cannot be extracted from the tensor so it has to |
| 158 | # be calculated from the index of the output tensor |
| 159 | if axis is not None: |
| 160 | # Get the start and end of the split |
| 161 | offset_start = [0] * 4 |
| 162 | axis_4D_list = split_op.attrs.get("split_axis_4D", None) # Present for UnpackReshaped and some StridedSlice |
| 163 | for idx, out in enumerate(outputs): |
| 164 | if axis_4D_list is not None: |
| 165 | axis_4D = axis_4D_list[idx] |
| 166 | else: |
| 167 | split_op.ofm_shapes[idx] = Shape4D(out.shape) |
| 168 | if axis >= 0: |
| 169 | axis_4D = axis + (4 - len(out.shape)) |
| 170 | else: |
| 171 | axis_4D = axis |
| 172 | |
| 173 | if out == tens: |
| 174 | ofm_shape_idx = idx |
| 175 | read_shape = split_op.ofm_shapes[idx] |
| 176 | break |
| 177 | |
| 178 | offset_start[axis_4D] += split_op.ofm_shapes[idx][axis_4D] |
| 179 | |
| 180 | new_op.read_offsets[0] = Shape4D.from_list(offset_start, 0) |
| 181 | new_op.read_shapes[0] = read_shape |
| 182 | new_op.run_on_npu = True |
| 183 | new_op.set_output_tensor(tens) |
| 184 | new_op.ifm_shapes.append(Shape4D(inp.shape)) |
| 185 | new_op.ofm_shapes.append(split_op.ofm_shapes[ofm_shape_idx]) |
| 186 | DebugDatabase.add_optimised(split_op, new_op) |
| 187 | |
| 188 | return tens |
| 189 | |
| 190 | |
| 191 | def remove_SplitSliceRead(op, arch): |
| 192 | |
| 193 | if op.type == Op.SplitSliceRead: |
| 194 | # Check if it is possible to put the SplitSliceRead on the tensor consumer, or if an avgpool need to be inserted |
| 195 | if ( |
| 196 | len(op.ofm.consumer_list) == 1 |
| 197 | and op.ofm.consumer_list[0] is not None |
| 198 | and op.ofm.consumer_list[0].run_on_npu |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 199 | and op.ofm.consumer_list[0].type not in memory_only_ops |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 200 | and op.ofm_shapes[0] == Shape4D.from_list(op.ofm.shape) |
| 201 | ): |
| 202 | # SplitSliceRead can be performed by tensor consumer |
| 203 | cons_op = op.ofm.consumer_list[0] |
Patrik Gustavsson | f1580f0 | 2021-09-01 12:43:02 +0200 | [diff] [blame] | 204 | move_splitsliceread_to_consumer(op, cons_op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 205 | else: |
| 206 | avgpool_op = create_avgpool_nop(op.name + "_avgpool") |
| 207 | avgpool_op.add_input_tensor(op.ifm) |
| 208 | avgpool_op.outputs = [op.ofm] |
| 209 | op.ofm.ops.remove(op) |
| 210 | op.ofm.ops.append(avgpool_op) |
| 211 | avgpool_op.ifm_shapes.append(op.ifm_shapes[0]) |
| 212 | avgpool_op.ofm_shapes.append(op.ofm_shapes[0]) |
| 213 | avgpool_op.read_offsets[0] = op.read_offsets[0] |
| 214 | avgpool_op.read_shapes[0] = op.read_shapes[0] |
| 215 | |
| 216 | op.ifm.consumer_list.remove(op) |
| 217 | DebugDatabase.add_optimised(op, avgpool_op) |
| 218 | |
| 219 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 220 | def calc_padding_and_skirt(padding_type, kernel, input_shape, explicit_padding): |
| 221 | k_w, k_h = kernel.dilated_wh() |
| 222 | s_x, s_y = kernel.stride |
| 223 | ypad = needed_total_padding(int(input_shape.height), int(s_y), int(k_h)) |
| 224 | xpad = needed_total_padding(int(input_shape.width), int(s_x), int(k_w)) |
| 225 | if padding_type == Padding.SAME: |
| 226 | left_pad = (xpad + 0) // 2 |
| 227 | right_pad = (xpad + 1) // 2 |
| 228 | top_pad = (ypad + 0) // 2 |
| 229 | bottom_pad = (ypad + 1) // 2 |
| 230 | elif padding_type == Padding.VALID: |
| 231 | left_pad = 0 |
| 232 | right_pad = 0 |
| 233 | top_pad = 0 |
| 234 | bottom_pad = 0 |
| 235 | elif padding_type == Padding.EXPLICIT: |
| 236 | # Padding is specified in a PAD operator which has been bypassed. |
| 237 | top, left, bottom, right = explicit_padding |
| 238 | top_pad, bottom_pad = calc_explicit_padding(int(input_shape.height), int(s_y), int(k_h), int(top), int(bottom)) |
| 239 | left_pad, right_pad = calc_explicit_padding(int(input_shape.width), int(s_x), int(k_w), int(left), int(right)) |
| 240 | else: |
Tim Hall | 0ab2edc | 2022-02-23 17:58:02 +0000 | [diff] [blame] | 241 | raise UnsupportedFeatureError(f"Unsupported padding = {padding_type} for padding calculation") |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 242 | padding = (top_pad, left_pad, bottom_pad, right_pad) |
| 243 | skirt = (top_pad, left_pad, ypad - top_pad, xpad - left_pad) |
| 244 | return padding, skirt |
| 245 | |
| 246 | |
| 247 | def calc_upscaled_padding_and_skirt(padding_type, kernel_size, stride, input_shape, upscaling_factor): |
| 248 | kernel_height, kernel_width = kernel_size[0], kernel_size[1] |
| 249 | if padding_type == Padding.SAME: |
| 250 | ypad = needed_total_padding(int(input_shape.height) * upscaling_factor, int(stride[1]), int(kernel_height)) |
| 251 | xpad = needed_total_padding(int(input_shape.width) * upscaling_factor, int(stride[2]), int(kernel_width)) |
| 252 | right_pad = max(((xpad + 1) // upscaling_factor) - 1, 0) |
| 253 | bottom_pad = max(((ypad + 1) // upscaling_factor) - 1, 0) |
| 254 | left_pad = max(kernel_width - 1 - right_pad, 0) |
| 255 | top_pad = max(kernel_height - 1 - bottom_pad, 0) |
| 256 | elif padding_type == Padding.VALID: |
| 257 | right_pad = max(kernel_width - 2, 0) |
| 258 | bottom_pad = max(kernel_height - 2, 0) |
| 259 | left_pad = kernel_width - 1 |
| 260 | top_pad = kernel_height - 1 |
| 261 | else: |
Tim Hall | 0ab2edc | 2022-02-23 17:58:02 +0000 | [diff] [blame] | 262 | raise UnsupportedFeatureError(f"Unsupported padding = {padding_type} for up-scaled padding calculation") |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 263 | padding = (top_pad, left_pad, bottom_pad, right_pad) |
| 264 | skirt = padding |
| 265 | return padding, skirt |
| 266 | |
| 267 | |
| 268 | def fixup_conv2d_backprop(op, arch, nng): |
| 269 | if op.type == Op.Conv2DBackpropInput: |
| 270 | # flip the inputs |
| 271 | op.inputs[0], op.inputs[2] = op.inputs[2], op.inputs[0] |
| 272 | op.type = Op.Conv2DBackpropInputSwitchedBias |
Tim Hall | 3c5cfe9 | 2022-03-16 16:31:57 +0000 | [diff] [blame] | 273 | op.ifm_resampling_mode = resampling_mode.TRANSPOSE |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 274 | |
| 275 | # Update strides |
| 276 | op.attrs.update({"stride_w": 1, "stride_h": 1, "strides": (1, 1, 1, 1)}) |
| 277 | |
| 278 | return op |
| 279 | |
| 280 | |
| 281 | # Convert the op to an elementwise add |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 282 | def convert_resize_1x1_to_add(op): |
| 283 | 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] | 284 | op.name = op.name + "_add" |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 285 | # Create an input tensor filled with zeros |
| 286 | shape = op.ofm_shapes[0].as_list() |
| 287 | tens = Tensor(shape, op.inputs[0].dtype, op.inputs[1].name + "_add") |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 288 | tens.values = np.zeros(shape, tens.dtype.as_numpy_type()) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 289 | tens.quantization = QuantizationParameters(0.0, 255.0) |
| 290 | tens.quantization.scale_f32 = 1.0 |
| 291 | tens.quantization.zero_point = 0 |
| 292 | tens.consumer_list = [op] |
| 293 | tens_op = op.inputs[1].ops[0] |
| 294 | tens_op.set_output_tensor(tens) |
| 295 | # Set the add inputs |
| 296 | op.inputs[1] = op.inputs[0] |
| 297 | op.inputs[0] = tens |
| 298 | op.set_ifm_ofm_shapes() |
| 299 | |
| 300 | return op |
| 301 | |
| 302 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 303 | # Convert ResizeNearestNeightbor with align corners to a depthwise convolution. The IFM will already have been upscaled |
| 304 | # apart from the final x2 scaling which will be done as part of this operation. The kernel contains a single coefficient |
| 305 | # to select the appropriate nearest neighbor value |
| 306 | def convert_resizenn_ac_to_depthwise_conv(op, upscale_factor): |
| 307 | ifm = op.ifm |
| 308 | ofm = op.ofm |
| 309 | output_depth = ofm.shape[-1] |
| 310 | dw_op_attrs = { |
| 311 | "padding": Padding.VALID, |
| 312 | "stride_h": 1, |
| 313 | "stride_w": 1, |
| 314 | "strides": (1, 1, 1, 1), |
| 315 | "depth_multiplier": 1, |
| 316 | "channel_multiplier": 1, |
| 317 | "dilation_h_factor": 1, |
| 318 | "dilation_w_factor": 1, |
| 319 | "dilation": (1, 1, 1, 1), |
| 320 | } |
| 321 | |
| 322 | # change resizebilinear to depthwise |
| 323 | op.type = Op.DepthwiseConv2DBias |
| 324 | op.attrs.update(dw_op_attrs) |
| 325 | op.set_input_tensor(ifm, 0) # ifm tensor index |
| 326 | op.activation = None |
| 327 | |
| 328 | # add input resample to resize by x2 |
| 329 | op.ifm_resampling_mode = resampling_mode.NEAREST |
| 330 | |
| 331 | # don't care about the rounding mode as it is nearest neighbor |
| 332 | |
| 333 | # setup weight tensor |
| 334 | weight_quant = QuantizationParameters() |
| 335 | weight_quant.scale_f32 = 1.0 # no scaling as only a single non-zero coeff to select the desired value |
| 336 | weight_quant.zero_point = 0 |
| 337 | weight_quant.quant_dim = 0 |
| 338 | ofm_dtype = ofm.dtype |
| 339 | if ofm_dtype == DataType.uint8: |
| 340 | weight_value_dtype = np.uint8 |
| 341 | weight_quant.quant_min = 0 |
| 342 | weight_quant.quant_max = (1 << ofm_dtype.bits) - 1 |
| 343 | else: |
| 344 | if ofm_dtype == DataType.int8: |
| 345 | weight_value_dtype = np.int8 |
| 346 | else: |
| 347 | assert ofm_dtype == DataType.int16 |
| 348 | weight_value_dtype = np.int16 |
| 349 | |
| 350 | weight_quant.quant_min = -(1 << (ofm_dtype.bits - 1)) |
| 351 | weight_quant.quant_max = (1 << (ofm_dtype.bits - 1)) - 1 |
| 352 | |
| 353 | weight_shape = [upscale_factor, upscale_factor, output_depth, output_depth] # HWIO |
| 354 | |
| 355 | # the single non-zero coefficient used to select the desired value needs to be placed in the 'centre value', which |
| 356 | # is calculated by finding the 'centre position' ('*' in the diagram below) and then choosing the 'value' that is |
| 357 | # below-and-right (i.e. next) to it (D). |
| 358 | # 0---1---2 |
| 359 | # | A | B | |
| 360 | # 1---*---+ |
| 361 | # | C | D | |
| 362 | # 2---+---+ |
| 363 | weight_values = [0] * (upscale_factor * upscale_factor) |
| 364 | centre_coeff = (upscale_factor // 2) * upscale_factor + (upscale_factor // 2) |
| 365 | weight_values[centre_coeff] = 1 |
| 366 | |
| 367 | # add weight tensor, this will discard the size tensor of the resize op |
| 368 | op.set_input_tensor( |
| 369 | create_const_tensor( |
| 370 | "weights", |
| 371 | weight_shape, |
| 372 | ofm.dtype, |
| 373 | np.array(weight_values).reshape(weight_shape), |
| 374 | value_dtype=weight_value_dtype, |
| 375 | quantization=weight_quant, |
| 376 | ), |
| 377 | 1, # inputs tensor weight index |
| 378 | ) |
| 379 | |
| 380 | # setup bias tensor by assign None and then call the fix-up function to create a suitable tensor. |
| 381 | # need to append the bias tensor as resize ops only have 2 inputs |
| 382 | assert len(op.inputs) == 2 |
| 383 | op.inputs.append(None) |
| 384 | fixup_bias_tensors(op, None, None) |
| 385 | |
| 386 | # finally update the shape incase we've change the tensor shapes or connections |
| 387 | op.set_ifm_ofm_shapes() |
| 388 | |
| 389 | return op |
| 390 | |
| 391 | |
| 392 | # Convert ResizeBilinear/NearestNeighbor to a number of 1x1 average pools with nearest neighbor x2 upscaling and one |
| 393 | # final average pool with a kernel size that depends upon the resize ops upscaling factor (x2, x4 or x8). The maximum |
| 394 | # upscale factor is limited to x8 because of the limit 8x8 kernel size limit for average pool with padding. |
| 395 | def convert_resize_to_upscale_and_average_pool(op): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 396 | pre_op = op |
| 397 | outputs = op.outputs |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 398 | dtype = op.ifm.dtype |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 399 | |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 400 | 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] | 401 | 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] | 402 | op.ifm_resampling_mode = resampling_mode.NEAREST |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 403 | |
| 404 | upscaled_shape = np.array(op.ifm_shapes[0].get_hw_as_list()) |
Tim Hall | 47c7636 | 2022-07-18 21:26:47 +0100 | [diff] [blame] | 405 | |
| 406 | # Get upscale factor that was calculated in the supported operators check |
| 407 | upscale_factor = op.attrs["upscale_factor"] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 408 | |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 409 | # Calculate how many times 2x2 upscaling needs to be performed |
Tim Hall | f9267da | 2022-04-20 20:19:48 +0100 | [diff] [blame] | 410 | # Force the result of round to be an integer. This is because the behaviour of rounding numpy.float64 values changed |
| 411 | # 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] | 412 | n = int(np.log2(upscale_factor)) |
| 413 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 414 | # Perform x2 upscaling n-1 times |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 415 | scaled_op = pre_op |
| 416 | for count in range(n - 1): |
| 417 | if count > 0: |
| 418 | scaled_op = op.clone(f"_{count}") |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 419 | scaled_op.inputs[0] = pre_op.outputs[0] |
| 420 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 421 | # Nearest neighbor x2 upscaling |
Tim Hall | 47c7636 | 2022-07-18 21:26:47 +0100 | [diff] [blame] | 422 | upscaled_shape = upscaled_shape * 2 |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 423 | shape = op.ofm_shapes[0].as_list() |
| 424 | shape[1:3] = upscaled_shape |
| 425 | out_tens = Tensor(shape, dtype, f"{op.outputs[0].name}_{count}") |
| 426 | out_tens.quantization = op.outputs[0].quantization.clone() |
| 427 | scaled_op.set_output_tensor(out_tens) |
| 428 | pre_op = scaled_op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 429 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 430 | scaled_op.set_ifm_ofm_shapes() |
| 431 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 432 | # Last x2 upscaling |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 433 | if n > 1: |
| 434 | scaled_op = op.clone(f"_{n-1}") |
| 435 | scaled_op.inputs[0] = pre_op.outputs[0] |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 436 | |
| 437 | if scaled_op.original_type == Op.ResizeBilinear: |
| 438 | if scaled_op.attrs["align_corners"]: |
| 439 | # no padding |
| 440 | scaled_op.attrs["padding"] = Padding.VALID |
| 441 | else: |
| 442 | # padding to the right and bottom (limits average pool to 8x8 kernel) |
| 443 | scaled_op.attrs["padding"] = Padding.EXPLICIT |
| 444 | scaled_op.attrs["explicit_padding"] = [0, 0, upscale_factor - 1, upscale_factor - 1] |
| 445 | |
| 446 | # kernal size dependent on the upscaling factor |
| 447 | scaled_op.attrs.update({"ksize": (1, upscale_factor, upscale_factor, 1)}) |
| 448 | else: # Op.ResizeNearestNeighbor |
| 449 | if scaled_op.attrs["align_corners"]: |
| 450 | # use depthwise conv to select the correct value |
| 451 | scaled_op = convert_resizenn_ac_to_depthwise_conv(scaled_op, upscale_factor) |
| 452 | else: |
| 453 | # keep 1x1 kernel and average pool |
| 454 | pass |
| 455 | |
Rickard Bolin | e546def | 2022-01-25 15:45:00 +0000 | [diff] [blame] | 456 | scaled_op.outputs = outputs |
| 457 | scaled_op.outputs[0].ops = [scaled_op] |
| 458 | scaled_op.set_ifm_ofm_shapes() |
| 459 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 460 | return op |
| 461 | |
| 462 | |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 463 | def fixup_resize(op, arch, nng): |
| 464 | if op.type.is_resize_op() and op.run_on_npu: |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 465 | if op.ifm_shapes[0] == op.ofm_shapes[0]: |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 466 | # Bypass the resize op which is essentially a NOP |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 467 | op.inputs = op.inputs[:1] |
| 468 | op.type = Op.Identity |
| 469 | 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] | 470 | convert_resize_1x1_to_add(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 471 | else: |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 472 | convert_resize_to_upscale_and_average_pool(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 473 | |
| 474 | return op |
| 475 | |
| 476 | |
| 477 | def convert_nop_split_to_identity(op, arch, nng): |
| 478 | if op.type == Op.Split and op.attrs.get("num_splits") == 1: |
| 479 | # the list comprehension should return a list with a single tensor |
| 480 | # if it shouldn't, remove_passthrough_tensor will fail appropriately |
| 481 | op.inputs = [i for i in op.inputs if i.shape == op.outputs[0].shape] |
| 482 | op.type = Op.Identity |
| 483 | return op |
| 484 | |
| 485 | |
Ayaan Masood | a2ec5aa | 2022-04-21 14:28:03 +0100 | [diff] [blame] | 486 | def rewrite_fully_connected_input(op: Operation, arch, nng): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 487 | |
Ayaan Masood | a2ec5aa | 2022-04-21 14:28:03 +0100 | [diff] [blame] | 488 | if op.type == Op.FullyConnected: |
| 489 | new_shape = op.ifm.get_shape_as_2d(op.weights.shape[-2]) |
| 490 | assert new_shape is not None, "Tensor can not be reshaped to 2D" |
| 491 | op.ifm_shapes[0] = new_shape |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 492 | return op |
| 493 | |
| 494 | |
| 495 | def convert_batched_fc_shape(op, arch, nng): |
| 496 | if op.type == Op.FullyConnected: |
| 497 | # Check if the first dimension indicates batching |
| 498 | if op.ifm_shapes[0].batch > 1: |
| 499 | batching_split = {4: (2, 2), 8: (2, 4), 16: (4, 4)} |
| 500 | n = op.ifm_shapes[0].batch |
| 501 | h, w = batching_split.get(n, (1, n)) |
| 502 | op.ifm_shapes[0] = Shape4D([1, h, w, op.ifm_shapes[0].depth]) |
| 503 | |
| 504 | # Reshape Weights to be 4D. IO becomes HWIO |
| 505 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 506 | weight_tensor.values = np.expand_dims(np.expand_dims(weight_tensor.values, axis=0), axis=0) |
| 507 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 508 | |
| 509 | n = op.ofm_shapes[0].batch |
| 510 | h, w = batching_split.get(n, (1, n)) |
| 511 | op.ofm_shapes[0] = Shape4D([1, h, w, op.ofm_shapes[0].depth]) |
| 512 | return op |
| 513 | |
| 514 | |
| 515 | def unfuse_activation_function(op): |
| 516 | if op.type == Op.ConcatTFLite and op.run_on_npu and op.activation is not None: |
| 517 | act_op = Operation(op.activation.op_type, op.name + op.activation.op_type.name) |
| 518 | op.activation = None |
| 519 | out_tens = op.outputs[0] |
| 520 | intermediate_tens = out_tens.clone("_act_intermediate") |
| 521 | act_op.set_output_tensor(out_tens) |
| 522 | act_op.add_input_tensor(intermediate_tens) |
| 523 | op.set_output_tensor(intermediate_tens) |
| 524 | act_op.set_ifm_ofm_shapes() |
| 525 | |
| 526 | |
| 527 | def rewrite_stridedslice_output(op, arch, nng): |
| 528 | if not op.run_on_npu or op.type != Op.StridedSlice: |
| 529 | return op |
| 530 | |
| 531 | new_axis_mask = op.attrs["new_axis_mask"] |
| 532 | shrink_axis_mask = op.attrs["shrink_axis_mask"] |
| 533 | |
| 534 | if shrink_axis_mask == 0 and new_axis_mask == 0: |
| 535 | return op |
| 536 | |
| 537 | axis_4D = [0] * len(op.outputs) |
| 538 | for idx, out_tens in enumerate(op.outputs): |
| 539 | output_shape = list(out_tens.shape) |
| 540 | |
| 541 | if shrink_axis_mask != 0: |
| 542 | n = 0 |
| 543 | axis = 0 |
| 544 | while shrink_axis_mask: |
| 545 | prev_mask = shrink_axis_mask |
| 546 | n += 1 |
| 547 | shrink_axis_mask &= shrink_axis_mask - 1 |
| 548 | axis = int(math.log2(prev_mask - shrink_axis_mask)) |
| 549 | output_shape = output_shape[:axis] + [1] + output_shape[axis:] |
| 550 | |
| 551 | assert len(out_tens.shape) == (len(op.inputs[0].shape) - n) |
| 552 | op.attrs["shrink_axis_mask"] = 0 |
| 553 | if axis >= 0: |
| 554 | axis_4D[idx] = axis + (4 - len(output_shape)) |
| 555 | else: |
| 556 | axis_4D[idx] = axis |
| 557 | op.ofm_shapes[idx] = Shape4D(output_shape) |
| 558 | |
| 559 | elif new_axis_mask != 0: |
| 560 | n = 0 |
| 561 | axis = 0 |
| 562 | while new_axis_mask: |
| 563 | prev_mask = new_axis_mask |
| 564 | n += 1 |
| 565 | new_axis_mask &= new_axis_mask - 1 |
| 566 | axis = int(math.log2(prev_mask - new_axis_mask)) |
| 567 | output_shape = output_shape[:axis] + output_shape[(axis + 1) :] |
| 568 | new_axis_mask >>= 1 |
| 569 | |
| 570 | assert len(out_tens.shape) == (len(op.inputs[0].shape) + n) |
| 571 | op.attrs["new_axis_mask"] = 0 |
| 572 | if axis >= 0: |
| 573 | axis_4D[idx] = axis + (4 - len(output_shape)) |
| 574 | else: |
| 575 | axis_4D[idx] = axis |
| 576 | op.ofm_shapes[idx] = Shape4D(output_shape) |
| 577 | |
| 578 | op.attrs["split_axis_4D"] = axis_4D |
| 579 | return op |
| 580 | |
| 581 | |
| 582 | def rewrite_unpack_output(op, arch, nng): |
| 583 | tens = op.outputs[0] |
| 584 | if op.run_on_npu and op.type == Op.Unpack: |
| 585 | # Unpack is also referred to as Unstack |
| 586 | axis = int(op.attrs["axis"]) |
| 587 | if axis < 0: # Convert to positive axis |
| 588 | axis = len(op.inputs[0].shape) + 1 + axis |
| 589 | op.type = Op.UnpackReshaped |
| 590 | desired_output_shape = tens.shape[:axis] + [1] + tens.shape[axis:] |
| 591 | |
| 592 | axis_4D = axis + (4 - len(desired_output_shape)) |
| 593 | op.attrs["split_axis_4D"] = [axis_4D] * len(op.outputs) |
| 594 | |
| 595 | for idx, out_tens in enumerate(op.outputs): |
| 596 | op.ofm_shapes[idx] = Shape4D(desired_output_shape) |
| 597 | return op |
| 598 | |
| 599 | |
| 600 | def add_padding_fields(op, arch, nng): |
| 601 | if op.run_on_npu: |
| 602 | if "padding" in op.attrs: |
| 603 | input_shape = op.ifm_shapes[0] |
| 604 | output_shape = op.ofm_shapes[0] |
| 605 | if op.type.is_conv2d_op() or op.type.is_depthwise_conv2d_op(): |
| 606 | kernel_size = op.inputs[1].shape[:2] |
| 607 | elif op.type.is_pool_op() or op.type.npu_block_type == NpuBlockType.ReduceSum: |
| 608 | kernel_size = op.attrs["ksize"][1:3] |
| 609 | else: |
| 610 | raise UnsupportedFeatureError(f"Unknown operation that uses padding: {optype_to_builtintype(op.type)}") |
| 611 | |
| 612 | if op.type == Op.Conv2DBackpropInputSwitchedBias: |
| 613 | upscaling_factor = output_shape.height // input_shape.height |
| 614 | padding, skirt = calc_upscaled_padding_and_skirt( |
| 615 | op.attrs["padding"], kernel_size, op.attrs["strides"], input_shape, upscaling_factor |
| 616 | ) |
| 617 | else: |
| 618 | padding, skirt = calc_padding_and_skirt( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 619 | op.attrs["padding"], |
| 620 | op.kernel, |
| 621 | input_shape, |
| 622 | op.attrs.get("explicit_padding"), |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 623 | ) |
| 624 | |
| 625 | op.attrs["explicit_padding"] = padding |
| 626 | op.attrs["skirt"] = skirt |
| 627 | |
| 628 | return op |
| 629 | |
| 630 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 631 | def reorder_depthwise_weights(op, arch, nng): |
| 632 | if op.type.is_depthwise_conv2d_op(): |
| 633 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 634 | weight_tensor.values = np.transpose(weight_tensor.values, (0, 1, 3, 2)) |
| 635 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 636 | weight_tensor.weight_transpose_depthwise = True |
| 637 | |
| 638 | return op |
| 639 | |
| 640 | |
| 641 | def optimise_strided_conv(op, arch, nng): |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 642 | if op.type != Op.Conv2DBias or op.op_index != 0: |
| 643 | return op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 644 | stride_x, stride_y = op.get_kernel_stride() |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 645 | weight_tensor = op.weights |
| 646 | ifm_shape = op.ifm_shapes[0] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 647 | |
| 648 | if ( |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 649 | stride_x == 2 |
| 650 | and ifm_shape.depth <= 4 |
| 651 | and ifm_shape.width % 2 == 0 |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 652 | and weight_tensor is not None |
| 653 | and weight_tensor.shape[1] >= 2 |
| 654 | ): |
Louis Verhaard | 43d2758 | 2022-03-17 14:06:00 +0100 | [diff] [blame] | 655 | k_w, _ = op.get_kernel_size() |
| 656 | curr_padding_x = needed_total_padding(ifm_shape.width, 2, k_w) |
| 657 | optimised_padding_x = needed_total_padding(ifm_shape.width // 2, 1, (k_w + 1) // 2) |
| 658 | if curr_padding_x != optimised_padding_x: |
| 659 | # Horizontal padding would become different after optimisation; this would not work |
| 660 | return op |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 661 | # IFM |
| 662 | op.ifm_shapes[0] = Shape4D([ifm_shape.batch, ifm_shape.height, ifm_shape.width // 2, ifm_shape.depth * 2]) |
| 663 | |
| 664 | # Weights |
| 665 | weight_shape = weight_tensor.shape |
| 666 | if weight_shape[1] % 2 != 0: |
| 667 | weight_shape[1] = weight_shape[1] + 1 |
| 668 | padded_array = np.zeros(weight_shape) |
| 669 | for i in range(weight_shape[0]): |
| 670 | padded_array[i] = np.vstack( |
| 671 | [ |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 672 | weight_tensor.values[i], |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 673 | np.full((1, weight_shape[2], weight_shape[3]), weight_tensor.quantization.zero_point), |
| 674 | ] |
| 675 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 676 | weight_tensor.values = padded_array |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 677 | weight_shape[1] //= 2 |
| 678 | weight_shape[2] *= 2 |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 679 | weight_tensor.values = np.reshape(weight_tensor.values, weight_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 680 | weight_tensor.set_all_shapes(weight_shape) |
| 681 | # If multiple copies of the weights are used, we could avoid |
| 682 | # them having the same address by changing the value_id |
| 683 | weight_tensor.value_id = uuid.uuid4() |
| 684 | |
| 685 | # Strides |
| 686 | stride_x = 1 |
| 687 | op.attrs.update({"stride_w": stride_x, "stride_h": stride_y, "strides": (1, stride_y, stride_x, 1)}) |
| 688 | |
| 689 | return op |
| 690 | |
| 691 | |
| 692 | def convert_conv_to_fc(op, arch, nng): |
| 693 | # Conv 1x1 can be equivalent to Fully Connected. |
| 694 | # By representing certain convs as fully connected layers, Vela can better determine wether or not to use |
| 695 | # caching/double buffering for the weights. |
| 696 | # (Weights dont need to be reloaded for convs when IFM H and W are 1) |
| 697 | if op.type == Op.Conv2DBias: |
| 698 | h = op.ifm_shapes[0].height |
| 699 | w = op.ifm_shapes[0].width |
| 700 | kh, kw, _, _ = op.inputs[1].shape |
| 701 | if h == 1 and w == 1 and kh == 1 and kw == 1: |
| 702 | # Overwrite this op as a Fully Connected Op |
| 703 | op.name += "_fc" |
| 704 | op.type = Op.FullyConnected |
| 705 | op.attrs = { |
| 706 | "weights_format": 0, |
| 707 | } |
| 708 | # Reshape Weights to be 2D. HWIO becomes just IO (as H and W are 1, they can just be dropped) |
| 709 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 710 | weight_tensor.values = weight_tensor.values.squeeze(axis=(0, 1)) |
| 711 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 712 | |
| 713 | DebugDatabase.add_optimised(op, op) |
| 714 | return op |
| 715 | |
| 716 | |
| 717 | def fixup_relus_with_differing_ifm_ofm_scaling(op, arch, nng): |
| 718 | if op.run_on_npu and op.type.is_relu_op(): |
| 719 | ifm = op.inputs[0] |
| 720 | ofm = op.outputs[0] |
| 721 | # Relu with differing IFM and OFM scaling cannot be fused with another primary op |
| 722 | # and requires its own to be inserted |
| 723 | if not check_quantized_tens_scaling_equal(ifm, ofm): |
| 724 | # Override this op with its own primary op (avgpool) |
| 725 | relu_fused_op = create_avgpool_nop(op.name + "_avgpool") |
| 726 | # And fuse the original activation function to it |
| 727 | relu_fused_op.activation = create_activation_function(op.type) |
Fredrik Svedberg | 1a7527c | 2021-09-13 15:52:16 +0200 | [diff] [blame] | 728 | # Add explicit rescaling |
| 729 | rescale = ifm.quantization.scale_f32 / ofm.quantization.scale_f32 |
| 730 | multiplier, shift = scaling.quantise_scale(rescale) |
| 731 | relu_fused_op.rescale = ExplicitScaling(False, [shift], [multiplier]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 732 | # Tidy up and assign the ifm and ofm to the new op |
| 733 | ifm.consumer_list.remove(op) |
| 734 | |
| 735 | relu_fused_op.add_input_tensor(ifm) |
| 736 | relu_fused_op.set_output_tensor(ofm) |
| 737 | relu_fused_op.set_ifm_ofm_shapes() |
| 738 | op = relu_fused_op |
| 739 | return op |
| 740 | |
| 741 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 742 | def convert_softmax(op, arch, nng): |
| 743 | if op.type == Op.Softmax and op.run_on_npu: |
| 744 | softmax = SoftMax(op) |
| 745 | op = softmax.get_graph() |
| 746 | return op |
| 747 | |
| 748 | |
Fredrik Svedberg | 8ddd489 | 2022-08-19 16:06:04 +0200 | [diff] [blame^] | 749 | def convert_prelu(op, arch, nng): |
| 750 | if op.type == Op.Prelu: |
| 751 | ifm, alpha, ofm = op.get_ifm_ifm2_ofm() |
| 752 | if None in (ifm, alpha, ofm): |
| 753 | return op |
| 754 | |
| 755 | no_scale_quant = ifm.quantization.clone() |
| 756 | no_scale_quant.scale_f32 = None |
| 757 | no_scale_quant.zero_point = 0 |
| 758 | zero = create_const_tensor("zero_const", [1, 1, 1, 1], ifm.dtype, [0], quantization=no_scale_quant) |
| 759 | |
| 760 | # Select values < 0 |
| 761 | min_op = Operation(Op.Minimum, op.name + "_min") |
| 762 | min_op.add_input_tensor(ifm) |
| 763 | min_op.add_input_tensor(zero) |
| 764 | fm_negative = ifm.clone(op.name + "_negative", set_unique=True) |
| 765 | min_op.set_output_tensor(fm_negative) |
| 766 | min_op.set_ifm_ofm_shapes() |
| 767 | DebugDatabase.add_optimised(op, min_op) |
| 768 | |
| 769 | # and multiply with alpha tensor |
| 770 | mul_alpha = Operation(Op.Mul, op.name + "_mul_alpha") |
| 771 | mul_alpha.add_input_tensor(fm_negative) |
| 772 | mul_alpha.add_input_tensor(alpha) |
| 773 | fm_alpha = ofm.clone(op.name + "_negative_alpha", set_unique=True) |
| 774 | mul_alpha.set_output_tensor(fm_alpha) |
| 775 | mul_alpha.set_ifm_ofm_shapes() |
| 776 | DebugDatabase.add_optimised(op, mul_alpha) |
| 777 | |
| 778 | # Select (and scale) values > 0 |
| 779 | relu_op = Operation(Op.Relu, op.name + "_relu") |
| 780 | relu_op.add_input_tensor(ifm) |
| 781 | fm_scaled = ofm.clone(op.name + "_positive_scaled", set_unique=True) |
| 782 | relu_op.set_output_tensor(fm_scaled) |
| 783 | relu_op.set_ifm_ofm_shapes() |
| 784 | DebugDatabase.add_optimised(op, relu_op) |
| 785 | |
| 786 | # Add scaled and alpha multiplied values (without scaling) |
| 787 | add_op = Operation(Op.RescaleAdd, op.name + "_add") |
| 788 | add_op.rescale = (1, 0) # No scale or shift |
| 789 | add_op.add_input_tensor(fm_alpha) |
| 790 | add_op.add_input_tensor(fm_scaled) |
| 791 | add_op.set_output_tensor(ofm) |
| 792 | add_op.set_ifm_ofm_shapes() |
| 793 | |
| 794 | DebugDatabase.add_optimised(op, add_op) |
| 795 | ifm.consumer_list.remove(op) |
| 796 | op = add_op |
| 797 | |
| 798 | return op |
| 799 | |
| 800 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 801 | def convert_mul_max_to_abs_or_lrelu(op, arch, nng): |
| 802 | r"""Whenever there is a subgraph with this topology: |
| 803 | |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 804 | Input X For X = -1 or X > 0 |
| 805 | | \ / This subgraph can be replaced with either |
| 806 | | Mul an Abs (if X = -1) or a LeakyReLU (if X > 0) |
| 807 | | / |
| 808 | Max |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 809 | """ |
| 810 | |
| 811 | if op.type == Op.Maximum: |
| 812 | # finds the Mul input(s) to the Max |
| 813 | muls = [i for i in op.inputs if i.ops[0].type == Op.Mul] |
| 814 | if len(muls) == 1: |
| 815 | mul = muls[0].ops[0] |
| 816 | elif len(muls) == 2: |
| 817 | # In the case both inputs are Muls, find the one with the same input as the Max |
| 818 | mul = [m for m in muls if len(set(op.inputs + m.ops[0].inputs)) == 1][0].ops[0] |
| 819 | else: |
| 820 | # No Mul inputs |
| 821 | return op |
| 822 | |
| 823 | # make sure the Mul doesn't have any other consumers |
| 824 | mul_ofm = mul.outputs[0] |
| 825 | if len(mul_ofm.consumers()) != 1: |
| 826 | return op |
| 827 | # make sure the Mul doesn't have a fused activation function |
| 828 | if mul.activation: |
| 829 | return op |
| 830 | ifm, ofm = op.get_ifm_ofm() |
| 831 | if ifm is None or ofm is None: |
| 832 | return op |
| 833 | |
| 834 | if ifm.dtype not in (DataType.uint8, DataType.int8) or ifm.dtype != ofm.dtype: |
| 835 | return op |
| 836 | if not check_quantized_tens_scaling_equal(ifm, ofm) or not check_quantized_tens_scaling_equal(ifm, mul_ofm): |
| 837 | # rewrite to LeakyRelu currently only makes sense if the quantization is identical |
| 838 | return op |
| 839 | |
| 840 | # finds the branched input that goes to both the Max and the Mul |
| 841 | shared = set(op.inputs) & set(mul.inputs) |
| 842 | if len(shared) == 1: |
| 843 | shared_in = shared.pop() |
| 844 | # find the constant scalar input to the Mul |
| 845 | const_tens = (set(mul.inputs) - {shared_in}).pop() |
| 846 | # check that it is a scalar |
| 847 | if const_tens.shape != []: |
| 848 | return op |
| 849 | const = const_tens.ops[0] |
| 850 | # check that it is a constant |
| 851 | if const.type != Op.Const: |
| 852 | return op |
| 853 | # Remove the Mul from the shared input's consumers |
| 854 | shared_in.consumer_list.remove(mul) |
| 855 | else: |
| 856 | return op |
| 857 | |
| 858 | val = const.outputs[0].values |
| 859 | if val >= 0: |
| 860 | new_op = Op.LeakyRelu |
| 861 | op.attrs["alpha"] = val |
| 862 | # to produce bit exact results, the alpha is not enough; |
| 863 | # save additional scaling info in attr "alpha_scale", to be used as input |
| 864 | # to the LUT construction |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 865 | alpha_scalar = const_tens.values - const_tens.quantization.zero_point |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 866 | mul_ifm_scale = np.double(ifm.quantization.scale_f32) |
| 867 | mul_ifm2_scale = np.double(const_tens.quantization.scale_f32) |
| 868 | mul_ofm_scale = np.double(mul_ofm.quantization.scale_f32) |
| 869 | alpha_scale, alpha_shift = scaling.elementwise_mul_scale(mul_ifm_scale, mul_ifm2_scale, mul_ofm_scale) |
| 870 | op.attrs["alpha_scaling"] = (alpha_scalar, alpha_scale, alpha_shift) |
| 871 | elif val == -1: |
| 872 | new_op = Op.Abs |
| 873 | else: |
| 874 | return op |
| 875 | |
| 876 | op.type = new_op |
| 877 | op.name = op.name.replace("Maximum", new_op.name) |
| 878 | op.outputs[0].name = op.outputs[0].name.replace("Maximum", new_op.name) |
| 879 | op.inputs = [shared_in] |
| 880 | op.set_ifm_ofm_shapes() |
| 881 | |
| 882 | # Record optimisation in debug database |
| 883 | DebugDatabase.add_optimised(op, op) |
| 884 | |
| 885 | return op |
| 886 | |
| 887 | |
| 888 | def convert_hardswish_to_lut(op, arch, nng): |
| 889 | if op.type == Op.HardSwish: |
| 890 | ifm, ofm = op.get_ifm_ofm() |
| 891 | # Generate the LUT |
| 892 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 893 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 894 | zp_in = ifm.quantization.zero_point |
| 895 | zp_out = ofm.quantization.zero_point |
| 896 | ifm_scale_hires = (1 / 128) * ifm_scale |
| 897 | relu_multiplier = np.double(3 / 32768) |
| 898 | out_scale, out_shift = scaling.quantise_scale(ifm_scale_hires / ofm_scale) |
| 899 | relu_scale, relu_shift = scaling.quantise_scale(ifm_scale_hires / relu_multiplier) |
| 900 | # Use 16bit scale |
| 901 | out_scale_16 = fp_math.downscale_multiplier_int32_to_int16(out_scale) |
| 902 | relu_scale_16 = fp_math.downscale_multiplier_int32_to_int16(relu_scale) |
| 903 | |
| 904 | values = [] |
| 905 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 906 | quantized_min = min(ix) |
| 907 | quantized_max = max(ix) |
| 908 | for x in ix: |
| 909 | input_value = x - zp_in |
| 910 | input_value_hires = input_value * 128 |
| 911 | # Compute the input value on essentially the output scale, not shifted yet |
| 912 | input_value_preshift = fp_math.saturating_rounding_mul16(input_value_hires, out_scale_16) |
| 913 | # Compute the "relu-ish multiplier". This matches the code in TensorFlow Lite Micro kernel |
| 914 | relu_value = np.int16(input_value_hires) |
| 915 | if relu_shift < 31: |
| 916 | relu_value = fp_math.shift_left16(relu_value, 30 - relu_shift) |
| 917 | |
| 918 | relu_value = fp_math.saturating_rounding_mul16(relu_value, relu_scale_16) |
| 919 | |
| 920 | if relu_shift < 31: |
| 921 | relu_value = fp_math.shift_left16(relu_value, 1) |
| 922 | |
| 923 | if relu_shift > 31: |
| 924 | relu_value = fp_math.rounding_divide_by_pot(relu_value, relu_shift - 31) |
| 925 | |
| 926 | # Rescaled the value into a 16bit fixedpoint relu_value in [-1, 1] |
| 927 | # Now convert that to a 16bit fixedpoint value in [0, 1] |
| 928 | relu_value = (relu_value + (1 << 15)) >> 1 |
| 929 | lut_result = fp_math.saturating_mul16(relu_value, input_value_preshift) |
| 930 | shift = 31 - out_shift |
| 931 | shift = -shift if shift < 0 else 0 |
| 932 | # Finally apply the output shift |
| 933 | lut_result = fp_math.rounding_divide_by_pot(lut_result, shift) + zp_out |
| 934 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 935 | values.append(lut_result) |
| 936 | return convert_to_lut(op, values, "hardswish") |
| 937 | return op |
| 938 | |
| 939 | |
| 940 | def convert_lrelu_to_mul_max(op, arch): |
| 941 | # Converts LeakyRelu to Max(alpha * IFM, identity * IFM) |
| 942 | # (the opposite of convert_mul_max_to_abs_or_lrelu) |
| 943 | ifm, ofm = op.get_ifm_ofm() |
| 944 | if ifm is None or ofm is None: |
| 945 | return op |
| 946 | |
| 947 | # Add multiplication with alpha |
| 948 | mul_alpha = Operation(Op.Mul, op.name + "_mul_alpha") |
| 949 | mul_alpha.add_input_tensor(ifm) |
| 950 | # Create const tensor containing alpha as scalar |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 951 | alpha = np.float32(op.attrs["alpha"]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 952 | quantization = ifm.quantization.clone() |
| 953 | quantization.min = 0 |
| 954 | quantization.max = alpha * (quantization.quant_max - quantization.quant_min) |
| 955 | quantization.zero_point = 0 |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 956 | if np.isinf(1 / alpha): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 957 | # Handling of alpha near zero |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 958 | quantization.scale_f32 = np.float32(1) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 959 | scalar = 0 |
| 960 | else: |
| 961 | quantization.scale_f32 = alpha |
| 962 | scalar = alpha |
| 963 | alpha_tens = create_const_tensor( |
| 964 | op.name + "_alpha_scalar", [], ifm.dtype, [scalar], np.float32, quantization=quantization |
| 965 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 966 | alpha_tens.values = np.array([1]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 967 | mul_alpha.add_input_tensor(alpha_tens) |
| 968 | fm_alpha = ofm.clone(op.name + "_alpha", set_unique=True) |
| 969 | mul_alpha.set_output_tensor(fm_alpha) |
| 970 | mul_alpha.set_ifm_ofm_shapes() |
| 971 | DebugDatabase.add_optimised(op, mul_alpha) |
| 972 | |
| 973 | if check_quantized_tens_scaling_equal(ifm, ofm): |
| 974 | # No identity multiplication is needed |
| 975 | fm_id = ifm |
| 976 | else: |
| 977 | # Add multiplication with identity |
| 978 | mul_identity = Operation(Op.Mul, op.name + "_mul_identity") |
| 979 | mul_identity.add_input_tensor(ifm) |
| 980 | # Create const tensor containing identity as scalar |
| 981 | quantization = ifm.quantization.clone() |
| 982 | quantization.min = 0 |
| 983 | quantization.max = quantization.quant_max - quantization.quant_min |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 984 | quantization.scale_f32 = np.float32(1) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 985 | quantization.zero_point = 0 |
| 986 | identity_tens = create_const_tensor( |
| 987 | op.name + "_id_scalar", [], ifm.dtype, [1], np.uint8, quantization=quantization |
| 988 | ) |
| 989 | mul_identity.add_input_tensor(identity_tens) |
| 990 | # Make sure that fm_id is allocated to a different address than fm_alpha |
| 991 | fm_id = ofm.clone(op.name + "_id", set_unique=True) |
| 992 | mul_identity.set_output_tensor(fm_id) |
| 993 | mul_identity.set_ifm_ofm_shapes() |
| 994 | DebugDatabase.add_optimised(op, mul_identity) |
| 995 | |
| 996 | # Convert LeakyRelu to Max, add the results of the multiplication(s) as inputs |
| 997 | op.type = Op.Maximum |
| 998 | op.name = op.name.replace("LeakyRelu", "Maximum") |
| 999 | op.inputs = [] |
| 1000 | ifm.consumer_list.remove(op) |
| 1001 | op.add_input_tensor(fm_alpha) |
| 1002 | op.add_input_tensor(fm_id) |
| 1003 | op.set_ifm_ofm_shapes() |
| 1004 | |
| 1005 | DebugDatabase.add_optimised(op, op) |
| 1006 | return op |
| 1007 | |
| 1008 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1009 | def convert_to_lut8(op, fn, fn_name): |
| 1010 | # Converts op to a no-op + int8/uint8 LUT which is generated with the given function. |
| 1011 | # fn is a function(real) -> real |
| 1012 | ifm, ofm = op.get_ifm_ofm() |
| 1013 | if ifm.dtype not in (DataType.uint8, DataType.int8) or ifm.dtype != ofm.dtype: |
| 1014 | return op |
| 1015 | # Generate the LUT |
| 1016 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 1017 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 1018 | zp_in = ifm.quantization.zero_point |
| 1019 | zp_out = ofm.quantization.zero_point |
| 1020 | values = [] |
| 1021 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 1022 | quantized_min = min(ix) |
| 1023 | quantized_max = max(ix) |
| 1024 | for x in ix: |
| 1025 | x_real = ifm_scale * (x - zp_in) |
| 1026 | y_real = fn(x_real) |
| 1027 | lut_result = round_away_zero(zp_out + y_real / ofm_scale) |
| 1028 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 1029 | values.append(lut_result) |
| 1030 | return convert_to_lut(op, values, fn_name) |
| 1031 | |
| 1032 | |
| 1033 | def convert_lrelu_to_lut(op, arch): |
| 1034 | ifm, ofm = op.get_ifm_ofm() |
| 1035 | # Generate the LUT |
| 1036 | alpha = op.attrs["alpha"] |
| 1037 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 1038 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 1039 | zp_in = ifm.quantization.zero_point |
| 1040 | zp_out = ofm.quantization.zero_point |
| 1041 | identity_scale, identity_shift = scaling.elementwise_mul_scale(ifm_scale, 1, ofm_scale) |
| 1042 | alpha_scalar = 1 |
| 1043 | alpha_scale, alpha_shift = scaling.elementwise_mul_scale(ifm_scale, alpha, ofm_scale) |
| 1044 | if "alpha_scaling" in op.attrs: |
| 1045 | # The LeakyRelu was the result from convert_mul_max_to_abs_or_lrelu |
| 1046 | alpha_scalar, alpha_scale, alpha_shift = op.attrs["alpha_scaling"] |
| 1047 | values = [] |
| 1048 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 1049 | quantized_min = min(ix) |
| 1050 | quantized_max = max(ix) |
| 1051 | for x in ix: |
| 1052 | if x < zp_in: |
| 1053 | lut_result = zp_out + fp_math.multiply_by_quantized_multiplier( |
| 1054 | alpha_scalar * (x - zp_in), alpha_scale, alpha_shift |
| 1055 | ) |
| 1056 | else: |
| 1057 | lut_result = zp_out + fp_math.multiply_by_quantized_multiplier(x - zp_in, identity_scale, identity_shift) |
| 1058 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 1059 | values.append(lut_result) |
| 1060 | return convert_to_lut(op, values, "lrelu") |
| 1061 | |
| 1062 | |
| 1063 | def convert_lrelu(op, arch, nng): |
| 1064 | # Converts LeakyRelu to a LUT based solution if possible, otherwise a mul + max |
| 1065 | if op.type != Op.LeakyRelu: |
| 1066 | return op |
| 1067 | ifm, ofm = op.get_ifm_ofm() |
| 1068 | if ifm is None or ofm is None: |
| 1069 | return op |
| 1070 | if ifm.dtype in (DataType.uint8, DataType.int8) and ifm.dtype == ofm.dtype: |
| 1071 | # use LUT for int8/uint8 |
| 1072 | return convert_lrelu_to_lut(op, arch) |
| 1073 | if check_quantized_tens_scaling_equal(ifm, ofm) and ifm.dtype == ofm.dtype == DataType.int16: |
| 1074 | # use LeakyRelu unmodified for int16 with equal input/output scaling |
| 1075 | return op |
| 1076 | return convert_lrelu_to_mul_max(op, arch) |
| 1077 | |
| 1078 | |
| 1079 | def convert_tanh_sigmoid_to_lut(op, arch, nng): |
| 1080 | # Converts int8/uint8 Sigmoid and Tanh to a LUT based solution |
| 1081 | if op.type == Op.Sigmoid: |
| 1082 | return convert_to_lut8(op, clamp_sigmoid, "sigmoid") |
| 1083 | elif op.type == Op.Tanh: |
| 1084 | return convert_to_lut8(op, math.tanh, "tanh") |
| 1085 | return op |
| 1086 | |
| 1087 | |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 1088 | def remove_memory_only_ops(op, arch): |
| 1089 | if op.run_on_npu and op.type in memory_only_ops: |
| 1090 | bypass_memory_only_ops(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1091 | |
| 1092 | |
| 1093 | def fuse_activation_function_with_prev(op, arch, nng): |
| 1094 | # if op is a no-op: attempts to move the activation function to the preceding op |
| 1095 | if not op.attrs.get("is_nop", False) or op.activation is None: |
| 1096 | return op |
| 1097 | ifm, ofm = op.get_ifm_ofm() |
| 1098 | if ifm is None or ofm is None: |
| 1099 | return op |
| 1100 | # finds the input(s) to the operation |
| 1101 | prev_op = ifm.ops[0] |
| 1102 | # Note: the below checks on prev_op require that a first optimize pass on the full graph has been performed |
| 1103 | fuse = ( |
| 1104 | prev_op.run_on_npu |
| 1105 | and prev_op.type.npu_block_type != NpuBlockType.Default |
| 1106 | and len(ifm.ops) == 1 |
| 1107 | and len(prev_op.outputs[0].consumers()) == 1 |
| 1108 | and prev_op.activation is None |
| 1109 | ) |
| 1110 | if op.activation_lut is not None and arch.shram_reserved_unused_banks == 0: |
| 1111 | # TODO: if SHRAM LUT space is shared with SHRAM ACC (32, 64 MAC), |
| 1112 | # LUT currently only works correctly for elementwise ops |
| 1113 | fuse = False |
| 1114 | if not fuse: |
| 1115 | return op |
| 1116 | # Move the fused activation function + corresponding info to prev_op |
| 1117 | prev_op.activation = op.activation |
| 1118 | prev_op.forced_output_quantization = op.forced_output_quantization |
| 1119 | if op.activation_lut is not None: |
| 1120 | prev_op.set_activation_lut(op.activation_lut) |
| 1121 | # Bypass op |
| 1122 | prev_op.set_output_tensor(ofm) |
| 1123 | DebugDatabase.add_optimised(op, prev_op) |
| 1124 | return op |
| 1125 | |
| 1126 | |
| 1127 | def _leading_pad_ok(leading_pad, stride, kernel_size): |
| 1128 | # If kernel size // 2 > stride, then (left, top) padding must be a multiple of stride, |
| 1129 | # otherwise replacing PAD by hardware padding would iterate the wrong IFM rows/columns |
| 1130 | max_size = kernel_size // 2 |
| 1131 | return leading_pad == max_size or max_size <= stride or leading_pad % stride == 0 |
| 1132 | |
| 1133 | |
| 1134 | def replace_pad_by_hw_pad(op: Operation, arch, nng): |
| 1135 | """ |
| 1136 | Tries to completely remove a PAD operator by using hardware padding. |
| 1137 | E.g. a PAD operation that pads 1, followed by a CONV with VALID padding and kernel size 3 |
| 1138 | is rewritten such that the PAD is removed, and the CONV uses SAME padding. |
| 1139 | Converts tens1 -> PAD -> tens2 -> CONV to tens1 -> CONV |
| 1140 | if both operations can be run on the NPU. |
| 1141 | This is the most efficient way to implement PAD, but cannot be done for all pad sizes. |
| 1142 | """ |
| 1143 | if ( |
| 1144 | (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] | 1145 | and op.type not in (Op.Conv2DBackpropInput, Op.Conv2DBackpropInputSwitchedBias) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1146 | and op.run_on_npu |
| 1147 | and op.attrs["padding"] == Padding.VALID |
| 1148 | ): |
| 1149 | pad_op = op.ifm.ops[0] |
| 1150 | if pad_op.type != Op.Pad or not pad_op.run_on_npu: |
| 1151 | return op |
| 1152 | if pad_op.ifm.dtype != pad_op.ofm.dtype or not check_quantized_tens_scaling_equal(pad_op.ofm, pad_op.ifm): |
| 1153 | return op |
| 1154 | top, left, bottom, right = get_pad_values_from_input(pad_op.inputs[1].values) |
| 1155 | k = op.kernel |
| 1156 | k_w, k_h = k.dilated_wh() |
| 1157 | |
| 1158 | # Check if the PAD operator can be replaced by hardware padding |
| 1159 | if left > k_w // 2 or right > k_w // 2 or top > k_h // 2 or bottom > k_h // 2: |
| 1160 | # Too much padding, it would require hardware padding to actually insert zeros |
| 1161 | return op |
| 1162 | if not _leading_pad_ok(top, k.stride.y, k_h) or not _leading_pad_ok(left, k.stride.x, k_w): |
| 1163 | return op |
| 1164 | |
| 1165 | if op.type.is_avgpool_op(): |
| 1166 | # For average pool, hardware padding can only be used if padding is 0 or kernel size / 2 |
| 1167 | for pad, k_size in ( |
| 1168 | (left, k_w), |
| 1169 | (right, k_w), |
| 1170 | (top, k_h), |
| 1171 | (bottom, k_h), |
| 1172 | ): |
| 1173 | if pad not in (0, k_size // 2): |
| 1174 | return op |
| 1175 | # Average pool is converted to depthwise, because NPU average pool + same padding |
| 1176 | # has a special implementation that is different from PAD followed by average pool with |
| 1177 | # valid padding. |
| 1178 | k_w, k_h = op.kernel.width, op.kernel.height |
| 1179 | ifm = op.ifm |
| 1180 | # Remember other inputs |
| 1181 | other_inputs = op.inputs[1:] |
| 1182 | # Create a weight tensor, all weights are set to 1/(kernel width * kernel height) |
| 1183 | quantization = QuantizationParameters(0.0, 255.0) |
| 1184 | quantization.scale_f32 = 1.0 / (k_w * k_h) |
| 1185 | quantization.zero_point = 0 |
| 1186 | shape = [k_h, k_w, 1, op.ofm.shape[-1]] |
| 1187 | weights = np.full(shape, 1) |
| 1188 | |
| 1189 | weight_tens = create_const_tensor( |
| 1190 | op.name + "_weights", |
| 1191 | shape, |
| 1192 | op.ifm.dtype, |
| 1193 | weights, |
| 1194 | np.uint8, |
| 1195 | purpose=TensorPurpose.Weights, |
| 1196 | quantization=quantization, |
| 1197 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1198 | weight_tens.values = weights |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1199 | op.type = Op.DepthwiseConv2DBias |
| 1200 | op.inputs = [] |
| 1201 | op.add_input_tensor(ifm) |
| 1202 | op.add_input_tensor(weight_tens) |
| 1203 | # Add bias tensor, all biases set to 0 |
| 1204 | op.inputs.append(None) |
| 1205 | fixup_bias_tensors(op, arch, nng) |
| 1206 | # Add other inputs |
| 1207 | op.inputs.extend(other_inputs) |
| 1208 | op.rounding_mode = NpuRoundingMode.NATURAL |
| 1209 | |
| 1210 | # Bypass the PAD operator |
| 1211 | op.set_input_tensor(pad_op.ifm, 0) |
| 1212 | # Adjust the padding attributes of the convolution operator |
| 1213 | op.attrs["padding"] = Padding.EXPLICIT |
| 1214 | op.attrs["explicit_padding"] = (top, left, bottom, right) |
| 1215 | op.set_ifm_ofm_shapes() |
| 1216 | return op |
| 1217 | |
| 1218 | |
| 1219 | def convert_pad(op: Operation, arch, nng): |
| 1220 | """ |
| 1221 | Rewrites PAD operator to an average pool that copies the IFM to the OFM |
| 1222 | + up to 4 average pool operators that fill the OFM with zeros at the borders. |
| 1223 | This is done as fall-back for the PAD operators that remain after replace_pad_by_hw_pad |
| 1224 | """ |
| 1225 | if op.type != Op.Pad or not op.run_on_npu: |
| 1226 | return op |
| 1227 | top, left, bottom, right = get_pad_values_from_input(op.inputs[1].values) |
| 1228 | |
| 1229 | ifm = op.ifm |
| 1230 | assert ifm is not None |
James Ward | 3e13434 | 2021-10-28 10:01:40 +0100 | [diff] [blame] | 1231 | ifm_shape = op.ifm_shapes[0] |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1232 | ofm = op.ofm |
| 1233 | assert ofm is not None |
| 1234 | ofm.ops = [] |
| 1235 | ofm_shape = op.ofm_shapes[0] |
| 1236 | |
| 1237 | # Average pool op that copies IFM to the right place inside the OFM |
| 1238 | shp0 = Shape4D(0, 0, 0, 0) |
| 1239 | shp_top = shp0.with_height(top) |
| 1240 | avgpool_op = create_avg_pool_for_concat(op, op.name + "_main", ifm, ifm_shape, shp_top.with_width(left)) |
| 1241 | avgpool_op.activation = op.activation |
| 1242 | quant = ofm.quantization |
| 1243 | pad_value = quant.zero_point |
| 1244 | # Add operations that fill the borders of the OFM |
| 1245 | if top > 0: |
| 1246 | shape = Shape4D(1, top, ofm_shape.width, ofm_shape.depth) |
| 1247 | zero_tens = create_const_tensor( |
| 1248 | op.name + "_top", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1249 | ) |
| 1250 | # If top/bottom or left/right are equal, the const tensors can be allocated to the same address |
| 1251 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1252 | create_avg_pool_for_concat(op, op.name + "_top", zero_tens, shape, shp0) |
| 1253 | if bottom > 0: |
| 1254 | shape = Shape4D(1, bottom, ofm_shape.width, ofm_shape.depth) |
| 1255 | zero_tens = create_const_tensor( |
| 1256 | op.name + "_bottom", |
| 1257 | shape.as_list(), |
| 1258 | ofm.dtype, |
| 1259 | shape.elements() * [pad_value], |
| 1260 | np.uint8, |
| 1261 | quantization=quant, |
| 1262 | ) |
| 1263 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1264 | create_avg_pool_for_concat( |
| 1265 | op, op.name + "_bottom", zero_tens, shape, shp0.with_height(ofm_shape.height - bottom) |
| 1266 | ) |
| 1267 | if left > 0: |
| 1268 | shape = Shape4D(1, ifm_shape.height, left, ofm_shape.depth) |
| 1269 | zero_tens = create_const_tensor( |
| 1270 | op.name + "_left", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1271 | ) |
| 1272 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1273 | create_avg_pool_for_concat(op, op.name + "_left", zero_tens, shape, shp_top) |
| 1274 | if right > 0: |
| 1275 | shape = Shape4D(1, ifm_shape.height, right, ofm_shape.depth) |
| 1276 | zero_tens = create_const_tensor( |
| 1277 | op.name + "_right", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1278 | ) |
| 1279 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1280 | create_avg_pool_for_concat( |
| 1281 | op, op.name + "_right", zero_tens, shape, shp_top.with_width(ofm_shape.width - right) |
| 1282 | ) |
| 1283 | |
| 1284 | op.type = Op.ConcatTFLite |
| 1285 | return avgpool_op |
| 1286 | |
| 1287 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1288 | def fixup_bias_tensors(op, arch, nng): |
| 1289 | if op.type.needs_bias() and op.bias is None: |
| 1290 | # Op has no bias, add bias tensor filled with zeros |
| 1291 | nr_biases = op.inputs[1].shape[-1] |
| 1292 | bias_values = [0] * nr_biases |
| 1293 | bias_tensor = create_const_tensor(op.name + "_bias", [nr_biases], DataType.int32, bias_values) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1294 | op.set_input_tensor(bias_tensor, op.type.info.indices.biases[0]) |
| 1295 | |
| 1296 | return op |
| 1297 | |
| 1298 | |
Fredrik Svedberg | cc8569f | 2021-11-01 14:25:29 +0100 | [diff] [blame] | 1299 | def fixup_asymmetric_weights(op, arch, nng): |
| 1300 | if op.run_on_npu and (op.type.is_conv2d_op() or op.type.is_depthwise_conv2d_op()): |
| 1301 | if op.ifm.dtype == DataType.int8: |
| 1302 | if not np.all(op.weights.quantization.zero_point == 0): |
| 1303 | print(f"Warning: {op.type} '{op.name}' has asymmetric weights, zero points have been adjusted.") |
| 1304 | op.weights.quantization.zero_point *= 0 |
| 1305 | |
| 1306 | return op |
| 1307 | |
| 1308 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1309 | def convert_mean_to_depthwise_conv_or_avgpool(op, arch, nng): |
| 1310 | if op.type == Op.Mean and op.run_on_npu: |
| 1311 | keep_dims = op.attrs.get("keep_dims", False) |
| 1312 | inp, axis = op.inputs |
| 1313 | shape = inp.shape |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1314 | ofm_shape = op.ofm.shape |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1315 | dims = len(shape) |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1316 | dims_ofm = len(ofm_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1317 | |
| 1318 | # Height and width axes have different index depending on dimensions |
| 1319 | if axis.shape == [] or axis.shape[0] == 1: # single axis |
| 1320 | axis = int(axis.values) if len(axis.shape) == 0 else int(axis.values[0]) |
| 1321 | if dims in (2, 3): |
| 1322 | if axis == 0: |
| 1323 | h, w = shape[axis], 1 |
| 1324 | else: |
| 1325 | h, w = 1, shape[axis] |
| 1326 | else: |
| 1327 | if axis == 1: |
| 1328 | h, w = shape[axis], 1 |
| 1329 | else: |
| 1330 | h, w = 1, shape[axis] |
| 1331 | else: # multiple axes |
| 1332 | axis = sorted(axis.values) |
| 1333 | h, w = [shape[i] for i in axis] |
| 1334 | |
| 1335 | # Set necessary depthwise attributes |
| 1336 | op.attrs.update( |
| 1337 | { |
| 1338 | "padding": Padding.VALID, |
| 1339 | "stride_h": 1, |
| 1340 | "stride_w": 1, |
| 1341 | "strides": (1, 1, 1, 1), |
| 1342 | "depth_multiplier": 1, |
| 1343 | "channel_multiplier": 1, |
| 1344 | "dilation_h_factor": 1, |
| 1345 | "dilation_w_factor": 1, |
| 1346 | "dilation": (1, 1, 1, 1), |
| 1347 | } |
| 1348 | ) |
| 1349 | # Change op type |
| 1350 | op.type = Op.DepthwiseConv2DBias |
| 1351 | # Set IFM/OFM shapes after changing op type |
| 1352 | op.set_ifm_ofm_shapes() |
| 1353 | |
| 1354 | weight_scale, bias = 1, None |
| 1355 | ofmq, ifmq = op.ofm.quantization, inp.quantization |
| 1356 | # Set rounding mode, scaling and zero point based on which reference implementation to match |
| 1357 | if len(shape) == 4 and axis == [1, 2] and keep_dims: |
| 1358 | if inp.dtype == DataType.uint8: |
| 1359 | # This attribute means a different scaling calculation is used in order to match reference |
| 1360 | op.low_precision_scaling = True |
| 1361 | weight_scale = h * w |
| 1362 | # Set zero points to 0 as they will be adjusted for with bias term |
| 1363 | foq = ofmq.clone() |
| 1364 | foq.zero_point = 0 |
| 1365 | fiq = ifmq.clone() |
| 1366 | fiq.zero_point = 0 |
| 1367 | op.forced_input_quantization = fiq |
| 1368 | bias_term = ofmq.zero_point - int(ifmq.zero_point * ifmq.scale_f32 / ofmq.scale_f32) |
| 1369 | # If the bias term is outside uint8 range, we need an Add op to apply it. |
| 1370 | if bias_term < 0 or bias_term > 255: |
| 1371 | intermediate = op.ofm.clone(suffix="_intermediate", set_unique=True) |
| 1372 | # Bias term has higher bitness (i32) than input/output (u8). |
| 1373 | # 16 bits is enough since the bias is added/subtracted from a u8 value, |
| 1374 | # the bias can only effectively assume values in the range [-255, 255]. |
| 1375 | intermediate.dtype = DataType.int16 |
| 1376 | intermediate.quantization.zero_point = 0 |
| 1377 | add_op = Operation(Op.Add, op.name + "_bias") |
| 1378 | add_op.forced_output_quantization = foq |
| 1379 | add_op.add_input_tensor(intermediate) |
| 1380 | quant = QuantizationParameters() |
| 1381 | quant.zero_point = 0 |
| 1382 | bias_term_tens = create_const_tensor( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1383 | op.name + "_bias", |
| 1384 | [1, 1, 1, 1], |
| 1385 | DataType.int16, |
| 1386 | [bias_term], |
| 1387 | np.int16, |
| 1388 | quantization=quant, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1389 | ) |
| 1390 | add_op.add_input_tensor(bias_term_tens) |
| 1391 | add_op.set_output_tensor(op.ofm) |
| 1392 | add_op.set_ifm_ofm_shapes() |
| 1393 | add_op.activation = op.activation |
| 1394 | op.activation = None |
| 1395 | op.set_output_tensor(intermediate) |
| 1396 | op.set_ifm_ofm_shapes() |
| 1397 | # If not, we can just do it with the OFM zero point. |
| 1398 | else: |
| 1399 | foq.zero_point = bias_term |
| 1400 | op.forced_output_quantization = foq |
| 1401 | else: |
| 1402 | assert inp.dtype == DataType.int8 |
| 1403 | # Use a depthwise to calculate the sum, |
| 1404 | # followed by a multiplication with 1/N to get the MEAN |
| 1405 | weight_scale = 1 |
| 1406 | intermediate = op.ofm.clone(suffix="_intermediate", set_unique=True) |
| 1407 | intermediate.dtype = DataType.int16 |
| 1408 | mul_op = Operation(Op.Mul, op.name + "_mul") |
| 1409 | mul_op.add_input_tensor(intermediate) |
| 1410 | # Create scalar containing 1/N |
| 1411 | quant = QuantizationParameters() |
| 1412 | quant.zero_point = 0 |
| 1413 | # The reference rounds negative numbers downwards, e.g. -1.5 is rounded to -2, |
| 1414 | # while rounding mode NATURAL would round this to -1. |
| 1415 | # This can only occur if N is even, and can be emulated by |
| 1416 | # multiplying with a number that is slightly smaller than 1/N. |
| 1417 | # It must be so small that other roundings are not affected; |
| 1418 | # the calculated value is based on worst case, |
| 1419 | # which is sum 256 * N (the maximum sum that can occur with int8) |
| 1420 | n = int(h * w) |
| 1421 | eps = 1 / (256 * (n + 1)) if n % 2 == 0 else 0 |
| 1422 | quant.scale_f32 = 1 / (n - eps) |
| 1423 | scalar = create_const_tensor( |
| 1424 | op.name + "_scalar", [1, 1, 1, 1], DataType.uint8, [1], np.uint8, quantization=quant |
| 1425 | ) |
| 1426 | mul_op.add_input_tensor(scalar) |
| 1427 | mul_op.set_output_tensor(op.ofm) |
| 1428 | mul_op.set_ifm_ofm_shapes() |
| 1429 | mul_op.rounding_mode = NpuRoundingMode.NATURAL |
| 1430 | mul_op.activation = op.activation |
| 1431 | op.activation = None |
| 1432 | op.set_output_tensor(intermediate) |
| 1433 | op.set_ifm_ofm_shapes() |
| 1434 | elif ifmq.zero_point == ofmq.zero_point and ifmq.scale_f32 == ofmq.scale_f32: |
| 1435 | # Here we can just use a simple AvgPool with truncating rounding, |
| 1436 | # as we're emulating simple integer division. |
| 1437 | op.rounding_mode = NpuRoundingMode.TRUNCATE |
| 1438 | op.type = Op.AvgPool |
| 1439 | op.attrs.update({"ksize": (1, h, w, 1), "filter_height": h, "filter_width": w}) |
| 1440 | else: |
| 1441 | op.rounding_mode = NpuRoundingMode.NATURAL |
| 1442 | weight_scale = 1 / (h * w) |
| 1443 | # Input zero point is adjusted after mean calculation, so we emulate that with a bias |
| 1444 | bias = -ifmq.zero_point * h * w |
| 1445 | fiq = ifmq.clone() |
| 1446 | fiq.zero_point = 0 |
| 1447 | op.forced_input_quantization = fiq |
| 1448 | |
| 1449 | # Change dimensions to 4 |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1450 | def extend_dims(dim, in_shape): |
| 1451 | if dim < 4: |
| 1452 | in_shape = [1] + in_shape |
| 1453 | if dim == 2: |
| 1454 | in_shape += [1] |
| 1455 | return in_shape |
| 1456 | |
| 1457 | if dims < 4 or dims_ofm < 4: |
| 1458 | # Fix the ofm dimension when keep_dims is false |
| 1459 | # e.g. IFM=1xHxWxC axis=2 OFM=1xHxC, the ofm_shape should be 1xHx1xC, not 1x1xHxC |
| 1460 | if isinstance(axis, int) and dims_ofm + 1 == dims: |
| 1461 | ofm_shape.insert(axis, 1) |
| 1462 | elif isinstance(axis, list) and (dims_ofm + len(axis) == dims): |
| 1463 | for i in axis: |
| 1464 | ofm_shape.insert(i, 1) |
| 1465 | shape = extend_dims(dims, shape) |
| 1466 | dims_ofm = len(ofm_shape) |
| 1467 | ofm_shape = extend_dims(dims_ofm, ofm_shape) |
| 1468 | op.set_ifm_ofm_shapes() |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1469 | |
Rickard Bolin | 7d7cb67 | 2021-12-07 09:09:14 +0000 | [diff] [blame] | 1470 | # If height is greater than max kernel height, reshape from HxW to 1x(HxW) |
| 1471 | if (h > 64 and op.type == Op.DepthwiseConv2DBias) or (h > 256 and op.type == Op.AvgPool): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1472 | shape = [shape[0], 1, h * w, shape[3]] |
| 1473 | op.ifm_shapes[0] = Shape4D(shape) |
| 1474 | if h > 256 and op.type == Op.AvgPool: |
| 1475 | op.attrs.update({"ksize": (1, 1, h * w, 1), "filter_height": 1, "filter_width": h * w}) |
| 1476 | |
| 1477 | # If the AvgPool version is used, we don't need to do anything else |
| 1478 | if op.type == Op.AvgPool: |
| 1479 | return op |
| 1480 | |
| 1481 | # Make unit weight tensor quantization |
| 1482 | weight_quant = ifmq.clone() |
| 1483 | weight_quant.min = 0 |
| 1484 | weight_quant.max = 255 |
| 1485 | weight_quant.scale_f32 = weight_scale |
| 1486 | weight_quant.zero_point = 0 |
| 1487 | |
| 1488 | # Set weight shape to [H,W,C,B] |
Diqing Zhong | 1ddb2ed | 2022-03-09 12:23:47 +0100 | [diff] [blame] | 1489 | weight_shape = [h, w, shape[3], shape[0]] |
| 1490 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1491 | # Add unit weight tensor |
| 1492 | op.set_input_tensor( |
| 1493 | create_const_tensor( |
| 1494 | "weights", |
| 1495 | weight_shape, |
| 1496 | inp.dtype, |
| 1497 | np.ones(weight_shape), |
| 1498 | value_dtype=np.uint8, |
| 1499 | quantization=weight_quant, |
| 1500 | ), |
| 1501 | 1, |
| 1502 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1503 | op.weights.values = np.reshape(op.inputs[1].values, weight_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1504 | |
| 1505 | # Add None bias tensor |
| 1506 | op.inputs.append(None) |
| 1507 | # Add bias tensor |
| 1508 | if bias: |
| 1509 | bias_shape = [shape[-1]] |
| 1510 | op.set_input_tensor( |
| 1511 | create_const_tensor( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1512 | "bias", |
| 1513 | bias_shape, |
| 1514 | inp.dtype, |
| 1515 | np.ones(bias_shape) * bias, |
| 1516 | value_dtype=np.int32, |
| 1517 | quantization=None, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1518 | ), |
| 1519 | 2, |
| 1520 | ) |
| 1521 | |
| 1522 | return op |
| 1523 | |
| 1524 | |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1525 | def optimise_quantize(op: Operation, arch, nng): |
| 1526 | |
| 1527 | if op.type == Op.Quantize and op.run_on_npu: |
| 1528 | |
| 1529 | ifm, ofm = op.get_ifm_ofm() |
| 1530 | input_values = ifm.values |
| 1531 | |
| 1532 | # Guard clause - input not const or no values to quantize |
| 1533 | if ifm.ops[0].type != Op.Const or input_values is None: |
| 1534 | return op |
| 1535 | |
| 1536 | # Singular val in numpy array, convert to indexable array |
| 1537 | if input_values.ndim == 0: |
| 1538 | input_values = np.array([input_values]) |
| 1539 | |
Fredrik Svedberg | 1156317 | 2022-07-06 14:54:12 +0200 | [diff] [blame] | 1540 | # requantized int8 to int8 or int16 to int16 |
| 1541 | 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] | 1542 | |
| 1543 | # scale needs to use double precision to match TFLite reference kernel |
| 1544 | effective_scale = np.float64(ifm.quantization.scale_f32) / np.float64(ofm.quantization.scale_f32) |
| 1545 | effective_multiplier, effective_shift = quantise_scale(effective_scale) |
| 1546 | |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1547 | requantized_vals = [] |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1548 | for val in input_values.flatten(): |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1549 | input_val = val - ifm.quantization.zero_point |
| 1550 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1551 | ofm_val = fp_math.multiply_by_quantized_multiplier(input_val, effective_multiplier, effective_shift) |
| 1552 | ofm_val += ofm.quantization.zero_point |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1553 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1554 | clamped_ofm_value = max(min(ofm_val, ofm.quantization.quant_max), ofm.quantization.quant_min) |
| 1555 | requantized_vals.append(clamped_ofm_value) |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1556 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1557 | ofm.values = np.array(requantized_vals, ofm.dtype.as_numpy_type()) |
| 1558 | ofm.values.shape = input_values.shape |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1559 | |
| 1560 | # Case: Float input - quantize to int |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1561 | elif ifm.dtype.type == BaseType.Float: |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1562 | |
| 1563 | quantized_vals = [] |
| 1564 | for val in input_values: |
| 1565 | |
| 1566 | # Derive quantized value |
| 1567 | quant_val = (val / ofm.quantization.scale_f32) + ofm.quantization.zero_point |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1568 | clamped_quantized_val = np.clip(quant_val, ofm.quantization.quant_min, ofm.quantization.quant_max) |
| 1569 | quantized_vals.append(clamped_quantized_val) |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1570 | |
| 1571 | # Pass the statically calculated quant val to output tensor |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1572 | ofm.values = np.array(quantized_vals, ofm.dtype.as_numpy_type()) |
| 1573 | |
| 1574 | # Unsupported data type |
| 1575 | else: |
| 1576 | return op |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1577 | |
| 1578 | # Make quantize op const and disconnect from parent node |
| 1579 | |
| 1580 | # Remove reference of the current quant op from the parent tensor's consumer list |
| 1581 | ifm.consumer_list = [consumer for consumer in ifm.consumer_list if consumer.op_index != op.op_index] |
| 1582 | |
| 1583 | # Clear any references to parent node |
| 1584 | op.inputs = [] |
| 1585 | |
| 1586 | # Convert this quantize op to const |
| 1587 | op.type = Op.Const |
| 1588 | |
| 1589 | return op |
| 1590 | |
| 1591 | |
Ayaan Masood | 4965fae | 2022-06-29 11:30:57 +0100 | [diff] [blame] | 1592 | def convert_shape_op_to_constant_tensor(op: Operation, arch, nng): |
| 1593 | """Static optimisation for SHAPE operator output value known at compile time""" |
| 1594 | |
| 1595 | # Disconnect SHAPE operator from its parent and transform SHAPE OP into constant |
| 1596 | |
| 1597 | if op.type == Op.Shape and op.run_on_npu: |
| 1598 | |
| 1599 | ifm, ofm = op.get_ifm_ofm() |
| 1600 | |
| 1601 | if len(ifm.shape) != ofm.shape[0]: |
| 1602 | return op |
| 1603 | |
| 1604 | # Remove reference of the current shape op from the parent tensor's consumer list |
| 1605 | ifm.consumer_list = [consumer for consumer in ifm.consumer_list if consumer.op_index != op.op_index] |
| 1606 | |
| 1607 | # Clear any references to parent node |
| 1608 | op.inputs = [] |
| 1609 | |
| 1610 | # Convert this SHAPE op to const |
| 1611 | op.type = Op.Const |
| 1612 | |
| 1613 | # Add size calculation to shape output tensors |
| 1614 | ofm.values = np.array(ifm.shape) |
| 1615 | |
| 1616 | return op |
| 1617 | |
| 1618 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1619 | def supported_operator_check(op, arch, nng): |
Jonas Ohlsson | 45e653d | 2021-07-26 16:13:12 +0200 | [diff] [blame] | 1620 | op.run_on_npu = arch.tflite_supported_operators.is_operator_supported(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1621 | return op |
| 1622 | |
| 1623 | |
| 1624 | def tflite_optimise_graph(nng, arch): |
Fredrik Svedberg | 1156317 | 2022-07-06 14:54:12 +0200 | [diff] [blame] | 1625 | # Compile time static optimisations |
Ayaan Masood | 25f48dd | 2022-06-29 18:16:04 +0100 | [diff] [blame] | 1626 | optimisation_list = [optimise_quantize, convert_shape_op_to_constant_tensor] |
| 1627 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1628 | for idx, sg in enumerate(nng.subgraphs): |
| 1629 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1630 | nng, |
| 1631 | sg, |
| 1632 | arch, |
| 1633 | [], |
Ayaan Masood | 4965fae | 2022-06-29 11:30:57 +0100 | [diff] [blame] | 1634 | optimisation_list, |
| 1635 | rewrite_unsupported=False, |
| 1636 | ) |
| 1637 | |
Fredrik Svedberg | a04f2f7 | 2022-07-06 13:42:24 +0200 | [diff] [blame] | 1638 | # Pre-processing step |
| 1639 | pre_process_list = [ |
| 1640 | supported_operator_check, |
| 1641 | set_ifm_ofm_op_shapes, |
| 1642 | ] |
| 1643 | |
Ayaan Masood | 4965fae | 2022-06-29 11:30:57 +0100 | [diff] [blame] | 1644 | for idx, sg in enumerate(nng.subgraphs): |
| 1645 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1646 | nng, |
| 1647 | sg, |
| 1648 | arch, |
| 1649 | [], |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1650 | pre_process_list, |
| 1651 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1652 | ) |
| 1653 | |
| 1654 | # Handle Concat Ops |
| 1655 | for idx, sg in enumerate(nng.subgraphs): |
| 1656 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [rewrite_concat_ops]) |
| 1657 | sg.refresh_after_modification() |
| 1658 | |
| 1659 | # Handle Split Ops |
| 1660 | for idx, sg in enumerate(nng.subgraphs): |
| 1661 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1662 | nng, |
| 1663 | sg, |
| 1664 | arch, |
| 1665 | [], |
| 1666 | [rewrite_unpack_output, rewrite_stridedslice_output, convert_nop_split_to_identity], |
| 1667 | rewrite_unsupported=False, |
| 1668 | ) |
| 1669 | |
| 1670 | for idx, sg in enumerate(nng.subgraphs): |
| 1671 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1672 | nng, |
| 1673 | sg, |
| 1674 | arch, |
| 1675 | [rewrite_split_ops], |
| 1676 | [], |
| 1677 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1678 | ) |
| 1679 | |
| 1680 | # Handle sg input output |
| 1681 | for idx, sg in enumerate(nng.subgraphs): |
| 1682 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1683 | nng, |
| 1684 | sg, |
| 1685 | arch, |
| 1686 | [], |
| 1687 | [fix_sg_input_output], |
| 1688 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1689 | ) |
| 1690 | |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 1691 | # Removal of memory only operators |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1692 | for sg in nng.subgraphs: |
Jonas Ohlsson | 0957e3e | 2021-09-01 15:57:21 +0200 | [diff] [blame] | 1693 | 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] | 1694 | sg.refresh_after_modification() |
| 1695 | |
| 1696 | # Rewrite of operators |
| 1697 | op_rewrite_list = [ |
| 1698 | set_tensor_equivalence, |
| 1699 | convert_mean_to_depthwise_conv_or_avgpool, |
| 1700 | convert_depthwise_to_conv, |
| 1701 | convert_conv_to_fc, |
| 1702 | convert_softmax, |
Fredrik Svedberg | 8ddd489 | 2022-08-19 16:06:04 +0200 | [diff] [blame^] | 1703 | convert_prelu, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1704 | optimise_strided_conv, |
| 1705 | convert_hardswish_to_lut, |
| 1706 | rewrite_fully_connected_input, |
| 1707 | convert_batched_fc_shape, |
| 1708 | fixup_conv2d_backprop, |
| 1709 | fixup_relus_with_differing_ifm_ofm_scaling, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1710 | reorder_depthwise_weights, |
Tim Hall | 885033b | 2022-07-21 11:46:03 +0100 | [diff] [blame] | 1711 | fixup_resize, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1712 | fixup_bias_tensors, |
Fredrik Svedberg | cc8569f | 2021-11-01 14:25:29 +0100 | [diff] [blame] | 1713 | fixup_asymmetric_weights, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1714 | convert_mul_max_to_abs_or_lrelu, |
| 1715 | convert_lrelu, |
| 1716 | convert_tanh_sigmoid_to_lut, |
| 1717 | replace_pad_by_hw_pad, |
| 1718 | ] |
| 1719 | |
| 1720 | for idx, sg in enumerate(nng.subgraphs): |
| 1721 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
Jonas Ohlsson | d857507 | 2022-03-30 10:30:25 +0200 | [diff] [blame] | 1722 | nng, |
| 1723 | sg, |
| 1724 | arch, |
| 1725 | [], |
| 1726 | op_rewrite_list, |
| 1727 | rewrite_unsupported=False, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1728 | ) |
| 1729 | |
| 1730 | for idx, sg in enumerate(nng.subgraphs): |
| 1731 | # remove passthrough tensors and attempt further optimizations |
| 1732 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1733 | nng, |
| 1734 | sg, |
| 1735 | arch, |
| 1736 | [remove_passthrough_tensor], |
| 1737 | [fuse_activation_function_with_prev, convert_pad, add_padding_fields], |
| 1738 | ) |
| 1739 | |
| 1740 | # Removal of SplitSliceRead, need to be done after optimisation has been performed, |
| 1741 | # since ifm/ofm_shapes are of importance to this function |
| 1742 | for sg in nng.subgraphs: |
| 1743 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [remove_SplitSliceRead]) |
| 1744 | sg.refresh_after_modification() |
| 1745 | |
| 1746 | return nng |