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 |
| 25 | from . import lut |
| 26 | from . import rewrite_graph |
| 27 | from . import scaling |
| 28 | from .api import NpuRoundingMode |
| 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 |
Patrik Gustavsson | df99510 | 2021-08-23 15:33:59 +0200 | [diff] [blame^] | 33 | from .graph_optimiser_util import bypass_reshape_and_squeeze_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 |
| 36 | from .graph_optimiser_util import fix_sg_input_output |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 37 | from .graph_optimiser_util import needed_total_padding |
| 38 | from .graph_optimiser_util import set_ifm_ofm_op_shapes |
| 39 | from .graph_optimiser_util import set_tensor_equivalence |
| 40 | from .numeric_util import clamp_sigmoid |
| 41 | from .numeric_util import full_shape |
| 42 | from .numeric_util import round_away_zero |
| 43 | from .operation import create_activation_function |
| 44 | from .operation import NpuBlockType |
| 45 | from .operation import Op |
| 46 | from .operation import Operation |
| 47 | from .operation import Padding |
| 48 | from .operation_util import create_avgpool_nop |
| 49 | from .operation_util import get_pad_values_from_input |
| 50 | from .shape4d import Shape4D |
| 51 | from .softmax import SoftMax |
| 52 | from .tensor import check_quantized_tens_scaling_equal |
| 53 | from .tensor import create_const_tensor |
| 54 | from .tensor import create_equivalence_id |
| 55 | from .tensor import QuantizationParameters |
| 56 | from .tensor import Tensor |
| 57 | from .tensor import TensorPurpose |
| 58 | from .tflite_mapping import optype_to_builtintype |
| 59 | |
| 60 | passthrough_nodes = (Op.Identity,) |
| 61 | |
| 62 | |
| 63 | def create_avg_pool_for_concat(concat_op, name, ifm, ifm_shape: Shape4D, write_offset: Shape4D): |
| 64 | """Creates an average pool for the given concat op/input feature map""" |
| 65 | ofm = concat_op.ofm |
| 66 | avgpool_op = create_avgpool_nop(name) |
| 67 | avgpool_op.inputs = [ifm] |
| 68 | avgpool_op.outputs = [ofm] |
| 69 | |
| 70 | avgpool_op.write_offset = write_offset |
| 71 | avgpool_op.write_shape = ifm_shape |
| 72 | ofm.ops.append(avgpool_op) |
| 73 | DebugDatabase.add_optimised(concat_op, avgpool_op) |
| 74 | avgpool_op.ifm_shapes.append(ifm_shape) |
| 75 | avgpool_op.ofm_shapes.append(concat_op.ofm_shapes[0]) |
| 76 | avgpool_op.memory_function = Op.ConcatSliceWrite |
| 77 | return avgpool_op |
| 78 | |
| 79 | |
| 80 | def remove_passthrough_tensor(tens, arch, nng): |
| 81 | if len(tens.ops) == 1 and tens.ops[0].type in passthrough_nodes: |
| 82 | assert len(tens.ops[0].inputs) == 1 |
| 83 | tens = tens.ops[0].inputs[0] |
| 84 | return tens |
| 85 | |
| 86 | |
| 87 | def rewrite_concat_ops(op, arch): |
| 88 | if not op.run_on_npu or not op.type.is_concat_op(): |
| 89 | return |
| 90 | |
| 91 | axis_4D = 0 |
| 92 | ofm = op.ofm |
| 93 | ofm.ops = [] |
| 94 | offset = 0 |
| 95 | |
| 96 | unfuse_activation_function(op) |
| 97 | |
| 98 | if op.type == Op.Pack: |
| 99 | # Pack is also referred to as Stack |
| 100 | axis = int(op.attrs["axis"]) |
| 101 | if axis < 0: # Convert to positive axis |
| 102 | axis = len(op.inputs[0].shape) + 1 + axis |
| 103 | |
| 104 | desired_shape = op.inputs[0].shape[:axis] + [1] + op.inputs[0].shape[axis:] |
| 105 | |
| 106 | axis_4D = axis + (4 - len(desired_shape)) |
| 107 | |
| 108 | for idx, inp in enumerate(op.inputs): |
| 109 | op.ifm_shapes[idx] = Shape4D(desired_shape) |
| 110 | op.type = Op.PackReshaped |
| 111 | |
| 112 | inputs, axis = op.get_concat_inputs_axis() |
| 113 | for idx, inp in enumerate(inputs): |
| 114 | if op.type != Op.PackReshaped: |
| 115 | op.ifm_shapes[idx] = Shape4D(inp.shape) |
| 116 | if axis >= 0: |
| 117 | axis_4D = axis + (4 - len(inp.shape)) |
| 118 | else: |
| 119 | axis_4D = axis |
| 120 | write_offset = [0, 0, 0, 0] |
| 121 | write_offset[axis_4D] = offset |
| 122 | concat_end = offset + op.ifm_shapes[idx][axis_4D] |
| 123 | create_avg_pool_for_concat( |
| 124 | op, op.name + str(idx) + "_avgpool", inp, op.ifm_shapes[idx], Shape4D.from_list(write_offset) |
| 125 | ) |
| 126 | offset = concat_end |
| 127 | assert ofm.shape[axis] == offset |
| 128 | |
| 129 | return op |
| 130 | |
| 131 | |
| 132 | def rewrite_split_ops(tens, arch, nng): |
| 133 | |
| 134 | if len(tens.ops) == 1 and tens.ops[0].type.is_split_op() and tens.ops[0].type != Op.Unpack: |
| 135 | split_op = tens.ops[0] |
| 136 | |
| 137 | # Not supported so leave it and run on CPU |
| 138 | if not split_op.run_on_npu: |
| 139 | return tens |
| 140 | |
| 141 | inp, outputs, axis, offset_start, offset_end = split_op.get_split_inputs_axis() |
| 142 | |
| 143 | tens.ops = [] |
| 144 | new_op = Operation(Op.SplitSliceRead, split_op.name) |
| 145 | new_op.inputs = [inp] |
| 146 | ofm_shape_idx = 0 |
| 147 | read_shape = offset_end |
| 148 | |
| 149 | # For Split the offset cannot be extracted from the tensor so it has to |
| 150 | # be calculated from the index of the output tensor |
| 151 | if axis is not None: |
| 152 | # Get the start and end of the split |
| 153 | offset_start = [0] * 4 |
| 154 | axis_4D_list = split_op.attrs.get("split_axis_4D", None) # Present for UnpackReshaped and some StridedSlice |
| 155 | for idx, out in enumerate(outputs): |
| 156 | if axis_4D_list is not None: |
| 157 | axis_4D = axis_4D_list[idx] |
| 158 | else: |
| 159 | split_op.ofm_shapes[idx] = Shape4D(out.shape) |
| 160 | if axis >= 0: |
| 161 | axis_4D = axis + (4 - len(out.shape)) |
| 162 | else: |
| 163 | axis_4D = axis |
| 164 | |
| 165 | if out == tens: |
| 166 | ofm_shape_idx = idx |
| 167 | read_shape = split_op.ofm_shapes[idx] |
| 168 | break |
| 169 | |
| 170 | offset_start[axis_4D] += split_op.ofm_shapes[idx][axis_4D] |
| 171 | |
| 172 | new_op.read_offsets[0] = Shape4D.from_list(offset_start, 0) |
| 173 | new_op.read_shapes[0] = read_shape |
| 174 | new_op.run_on_npu = True |
| 175 | new_op.set_output_tensor(tens) |
| 176 | new_op.ifm_shapes.append(Shape4D(inp.shape)) |
| 177 | new_op.ofm_shapes.append(split_op.ofm_shapes[ofm_shape_idx]) |
| 178 | DebugDatabase.add_optimised(split_op, new_op) |
| 179 | |
| 180 | return tens |
| 181 | |
| 182 | |
| 183 | def remove_SplitSliceRead(op, arch): |
| 184 | |
| 185 | if op.type == Op.SplitSliceRead: |
| 186 | # Check if it is possible to put the SplitSliceRead on the tensor consumer, or if an avgpool need to be inserted |
| 187 | if ( |
| 188 | len(op.ofm.consumer_list) == 1 |
| 189 | and op.ofm.consumer_list[0] is not None |
| 190 | and op.ofm.consumer_list[0].run_on_npu |
Jonas Ohlsson | fbfd96e | 2021-08-25 11:38:03 +0200 | [diff] [blame] | 191 | and op.ofm.consumer_list[0].type not in (Op.Reshape, Op.Squeeze) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 192 | and op.ofm_shapes[0] == Shape4D.from_list(op.ofm.shape) |
| 193 | ): |
| 194 | # SplitSliceRead can be performed by tensor consumer |
| 195 | cons_op = op.ofm.consumer_list[0] |
| 196 | if cons_op.ifm == op.ofm: |
| 197 | cons_op.read_offsets[0] = op.read_offsets[0] |
| 198 | cons_op.read_shapes[0] = op.read_shapes[0] |
| 199 | cons_op.set_input_tensor(op.ifm, cons_op.type.info.indices.ifms[0]) |
| 200 | cons_op.ifm_shapes[0] = op.ifm_shapes[0] |
| 201 | elif cons_op.type.is_binary_elementwise_op() and cons_op.ifm2 == op.ofm: |
| 202 | cons_op.read_offsets[1] = op.read_offsets[0] |
| 203 | cons_op.read_shapes[1] = op.read_shapes[0] |
| 204 | cons_op.set_input_tensor(op.ifm, cons_op.type.info.indices.ifms[1]) |
| 205 | cons_op.ifm_shapes[1] = op.ifm_shapes[0] |
| 206 | |
| 207 | if "skirt" in cons_op.attrs: |
| 208 | assert cons_op.attrs["explicit_padding"] == cons_op.attrs["skirt"] |
| 209 | cons_op.attrs["skirt"] = None |
| 210 | cons_op.attrs["force_padding"] = True |
| 211 | op.ofm.consumer_list.remove(cons_op) |
| 212 | op.ofm.ops = [] |
| 213 | op.ifm.consumer_list.remove(op) |
| 214 | else: |
| 215 | avgpool_op = create_avgpool_nop(op.name + "_avgpool") |
| 216 | avgpool_op.add_input_tensor(op.ifm) |
| 217 | avgpool_op.outputs = [op.ofm] |
| 218 | op.ofm.ops.remove(op) |
| 219 | op.ofm.ops.append(avgpool_op) |
| 220 | avgpool_op.ifm_shapes.append(op.ifm_shapes[0]) |
| 221 | avgpool_op.ofm_shapes.append(op.ofm_shapes[0]) |
| 222 | avgpool_op.read_offsets[0] = op.read_offsets[0] |
| 223 | avgpool_op.read_shapes[0] = op.read_shapes[0] |
| 224 | |
| 225 | op.ifm.consumer_list.remove(op) |
| 226 | DebugDatabase.add_optimised(op, avgpool_op) |
| 227 | |
| 228 | |
| 229 | def insert_copy_op_after_tens(tens): |
| 230 | tens_cons_list_copy = tens.consumer_list.copy() |
| 231 | |
| 232 | # Create a avg_pool nop op with ifm as input |
| 233 | copy_tens = tens.clone() |
| 234 | copy_op = create_avgpool_nop(tens.name + "_avgpool") |
| 235 | copy_op.add_input_tensor(tens) |
| 236 | copy_op.set_output_tensor(copy_tens) |
| 237 | copy_op.set_ifm_ofm_shapes() |
| 238 | copy_op.run_on_npu = True |
| 239 | |
| 240 | # Set copy_ifm consumers |
| 241 | for tens_cons in tens_cons_list_copy: |
| 242 | if tens_cons is not None: |
| 243 | for ifm_idx, cons_inp in enumerate(tens_cons.inputs): |
| 244 | if cons_inp == tens: |
| 245 | tens_cons.set_input_tensor(copy_tens, ifm_idx) |
| 246 | |
| 247 | DebugDatabase.add_optimised(tens.ops[0], copy_op) |
| 248 | |
| 249 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 250 | def calc_padding_and_skirt(padding_type, kernel, input_shape, explicit_padding): |
| 251 | k_w, k_h = kernel.dilated_wh() |
| 252 | s_x, s_y = kernel.stride |
| 253 | ypad = needed_total_padding(int(input_shape.height), int(s_y), int(k_h)) |
| 254 | xpad = needed_total_padding(int(input_shape.width), int(s_x), int(k_w)) |
| 255 | if padding_type == Padding.SAME: |
| 256 | left_pad = (xpad + 0) // 2 |
| 257 | right_pad = (xpad + 1) // 2 |
| 258 | top_pad = (ypad + 0) // 2 |
| 259 | bottom_pad = (ypad + 1) // 2 |
| 260 | elif padding_type == Padding.VALID: |
| 261 | left_pad = 0 |
| 262 | right_pad = 0 |
| 263 | top_pad = 0 |
| 264 | bottom_pad = 0 |
| 265 | elif padding_type == Padding.EXPLICIT: |
| 266 | # Padding is specified in a PAD operator which has been bypassed. |
| 267 | top, left, bottom, right = explicit_padding |
| 268 | top_pad, bottom_pad = calc_explicit_padding(int(input_shape.height), int(s_y), int(k_h), int(top), int(bottom)) |
| 269 | left_pad, right_pad = calc_explicit_padding(int(input_shape.width), int(s_x), int(k_w), int(left), int(right)) |
| 270 | else: |
| 271 | raise UnsupportedFeatureError(f"Unknown padding") |
| 272 | padding = (top_pad, left_pad, bottom_pad, right_pad) |
| 273 | skirt = (top_pad, left_pad, ypad - top_pad, xpad - left_pad) |
| 274 | return padding, skirt |
| 275 | |
| 276 | |
| 277 | def calc_upscaled_padding_and_skirt(padding_type, kernel_size, stride, input_shape, upscaling_factor): |
| 278 | kernel_height, kernel_width = kernel_size[0], kernel_size[1] |
| 279 | if padding_type == Padding.SAME: |
| 280 | ypad = needed_total_padding(int(input_shape.height) * upscaling_factor, int(stride[1]), int(kernel_height)) |
| 281 | xpad = needed_total_padding(int(input_shape.width) * upscaling_factor, int(stride[2]), int(kernel_width)) |
| 282 | right_pad = max(((xpad + 1) // upscaling_factor) - 1, 0) |
| 283 | bottom_pad = max(((ypad + 1) // upscaling_factor) - 1, 0) |
| 284 | left_pad = max(kernel_width - 1 - right_pad, 0) |
| 285 | top_pad = max(kernel_height - 1 - bottom_pad, 0) |
| 286 | elif padding_type == Padding.VALID: |
| 287 | right_pad = max(kernel_width - 2, 0) |
| 288 | bottom_pad = max(kernel_height - 2, 0) |
| 289 | left_pad = kernel_width - 1 |
| 290 | top_pad = kernel_height - 1 |
| 291 | else: |
| 292 | raise UnsupportedFeatureError(f"Unknown padding") |
| 293 | padding = (top_pad, left_pad, bottom_pad, right_pad) |
| 294 | skirt = padding |
| 295 | return padding, skirt |
| 296 | |
| 297 | |
| 298 | def fixup_conv2d_backprop(op, arch, nng): |
| 299 | if op.type == Op.Conv2DBackpropInput: |
| 300 | # flip the inputs |
| 301 | op.inputs[0], op.inputs[2] = op.inputs[2], op.inputs[0] |
| 302 | op.type = Op.Conv2DBackpropInputSwitchedBias |
| 303 | op.ifm.resampling_mode = resampling_mode.TRANSPOSE |
| 304 | |
| 305 | # Update strides |
| 306 | op.attrs.update({"stride_w": 1, "stride_h": 1, "strides": (1, 1, 1, 1)}) |
| 307 | |
| 308 | return op |
| 309 | |
| 310 | |
| 311 | # Convert the op to an elementwise add |
| 312 | def convert_resizebilinear_1x1_to_add(op): |
| 313 | op.type = Op.Add |
| 314 | op.name = op.name + "_add" |
| 315 | op.attrs["resizebilinear"] = True |
| 316 | # Create an input tensor filled with zeros |
| 317 | shape = op.ofm_shapes[0].as_list() |
| 318 | tens = Tensor(shape, op.inputs[0].dtype, op.inputs[1].name + "_add") |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 319 | tens.values = np.zeros(shape, tens.dtype.as_numpy_type()) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 320 | tens.quantization = QuantizationParameters(0.0, 255.0) |
| 321 | tens.quantization.scale_f32 = 1.0 |
| 322 | tens.quantization.zero_point = 0 |
| 323 | tens.consumer_list = [op] |
| 324 | tens_op = op.inputs[1].ops[0] |
| 325 | tens_op.set_output_tensor(tens) |
| 326 | # Set the add inputs |
| 327 | op.inputs[1] = op.inputs[0] |
| 328 | op.inputs[0] = tens |
| 329 | op.set_ifm_ofm_shapes() |
| 330 | |
| 331 | return op |
| 332 | |
| 333 | |
| 334 | # Convert ResizeBilinear to a number of 2x2 pool ops |
| 335 | def convert_resizebilinear_to_2x2_pool(op): |
| 336 | count = 0 |
| 337 | pre_op = op |
| 338 | outputs = op.outputs |
| 339 | |
| 340 | op.attrs.update({"strides": (1, 1, 1, 1), "ksize": (1, 2, 2, 1)}) |
| 341 | if op.attrs["align_corners"]: |
| 342 | shape_modifier = 1 |
| 343 | op.attrs["padding"] = Padding.VALID |
| 344 | else: |
| 345 | shape_modifier = 0 |
| 346 | op.attrs["padding"] = Padding.SAME |
| 347 | op.inputs[0].resampling_mode = resampling_mode.NEAREST |
| 348 | |
| 349 | upscaled_shape = np.array(op.ifm_shapes[0].get_hw_as_list()) |
| 350 | out_shape = np.array(op.ofm_shapes[0].get_hw_as_list()) |
| 351 | if (upscaled_shape == upscaled_shape * 2 - shape_modifier).all(): |
| 352 | return op |
| 353 | |
| 354 | while (upscaled_shape < out_shape).all(): |
| 355 | if count == 0: |
| 356 | scaled_op = pre_op |
| 357 | else: |
| 358 | scaled_op = op.clone("_{}".format(count)) |
| 359 | scaled_op.inputs[0] = pre_op.outputs[0] |
| 360 | |
| 361 | upscaled_shape = upscaled_shape * 2 - shape_modifier |
| 362 | |
| 363 | if (upscaled_shape == out_shape).all(): |
| 364 | scaled_op.outputs = outputs |
| 365 | scaled_op.outputs[0].ops = [scaled_op] |
| 366 | else: |
| 367 | shape = op.ofm_shapes[0].as_list() |
| 368 | shape[1:3] = upscaled_shape |
| 369 | out_tens = Tensor(shape, DataType.int16, "{}_{}".format(op.outputs[0].name, count)) |
| 370 | out_tens.quantization = op.outputs[0].quantization.clone() |
| 371 | out_tens.quantization.quant_min = np.iinfo(np.int16).min |
| 372 | out_tens.quantization.quant_max = np.iinfo(np.int16).max |
| 373 | scaled_op.set_output_tensor(out_tens) |
| 374 | pre_op = scaled_op |
| 375 | count += 1 |
| 376 | |
| 377 | # Setup the scale value |
| 378 | if scaled_op.inputs[0].dtype.bits == 8 and scaled_op.outputs[0].dtype.bits == 16: |
| 379 | scaled_op.rescale = 128 |
| 380 | elif scaled_op.inputs[0].dtype.bits == 16 and scaled_op.outputs[0].dtype.bits == 8: |
| 381 | scaled_op.rescale = 1 / 128 |
| 382 | else: |
| 383 | scaled_op.rescale = None |
| 384 | scaled_op.set_ifm_ofm_shapes() |
| 385 | |
| 386 | return op |
| 387 | |
| 388 | |
| 389 | def fixup_resizebilinear(op, arch, nng): |
| 390 | if op.type == Op.ResizeBilinear and op.run_on_npu: |
| 391 | if op.ifm_shapes[0] == op.ofm_shapes[0]: |
| 392 | # Bypass nop resizebilinear |
| 393 | op.inputs = op.inputs[:1] |
| 394 | op.type = Op.Identity |
| 395 | elif op.ifm_shapes[0].height == 1 and op.ifm_shapes[0].width == 1: |
| 396 | convert_resizebilinear_1x1_to_add(op) |
| 397 | else: |
| 398 | convert_resizebilinear_to_2x2_pool(op) |
| 399 | |
| 400 | return op |
| 401 | |
| 402 | |
| 403 | def convert_nop_split_to_identity(op, arch, nng): |
| 404 | if op.type == Op.Split and op.attrs.get("num_splits") == 1: |
| 405 | # the list comprehension should return a list with a single tensor |
| 406 | # if it shouldn't, remove_passthrough_tensor will fail appropriately |
| 407 | op.inputs = [i for i in op.inputs if i.shape == op.outputs[0].shape] |
| 408 | op.type = Op.Identity |
| 409 | return op |
| 410 | |
| 411 | |
| 412 | def rewrite_fully_connected_input(op, arch, nng): |
| 413 | if op.type == Op.FullyConnected: |
| 414 | n_in_elems = op.weights.shape[-2] |
| 415 | elms = op.ifm.elements() |
| 416 | batch_size = elms // n_in_elems |
| 417 | assert batch_size * n_in_elems == elms |
| 418 | |
| 419 | op.ifm_shapes[0] = Shape4D([batch_size, 1, 1, n_in_elems]) |
| 420 | return op |
| 421 | |
| 422 | |
| 423 | def convert_batched_fc_shape(op, arch, nng): |
| 424 | if op.type == Op.FullyConnected: |
| 425 | # Check if the first dimension indicates batching |
| 426 | if op.ifm_shapes[0].batch > 1: |
| 427 | batching_split = {4: (2, 2), 8: (2, 4), 16: (4, 4)} |
| 428 | n = op.ifm_shapes[0].batch |
| 429 | h, w = batching_split.get(n, (1, n)) |
| 430 | op.ifm_shapes[0] = Shape4D([1, h, w, op.ifm_shapes[0].depth]) |
| 431 | |
| 432 | # Reshape Weights to be 4D. IO becomes HWIO |
| 433 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 434 | weight_tensor.values = np.expand_dims(np.expand_dims(weight_tensor.values, axis=0), axis=0) |
| 435 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 436 | |
| 437 | n = op.ofm_shapes[0].batch |
| 438 | h, w = batching_split.get(n, (1, n)) |
| 439 | op.ofm_shapes[0] = Shape4D([1, h, w, op.ofm_shapes[0].depth]) |
| 440 | return op |
| 441 | |
| 442 | |
| 443 | def unfuse_activation_function(op): |
| 444 | if op.type == Op.ConcatTFLite and op.run_on_npu and op.activation is not None: |
| 445 | act_op = Operation(op.activation.op_type, op.name + op.activation.op_type.name) |
| 446 | op.activation = None |
| 447 | out_tens = op.outputs[0] |
| 448 | intermediate_tens = out_tens.clone("_act_intermediate") |
| 449 | act_op.set_output_tensor(out_tens) |
| 450 | act_op.add_input_tensor(intermediate_tens) |
| 451 | op.set_output_tensor(intermediate_tens) |
| 452 | act_op.set_ifm_ofm_shapes() |
| 453 | |
| 454 | |
| 455 | def rewrite_stridedslice_output(op, arch, nng): |
| 456 | if not op.run_on_npu or op.type != Op.StridedSlice: |
| 457 | return op |
| 458 | |
| 459 | new_axis_mask = op.attrs["new_axis_mask"] |
| 460 | shrink_axis_mask = op.attrs["shrink_axis_mask"] |
| 461 | |
| 462 | if shrink_axis_mask == 0 and new_axis_mask == 0: |
| 463 | return op |
| 464 | |
| 465 | axis_4D = [0] * len(op.outputs) |
| 466 | for idx, out_tens in enumerate(op.outputs): |
| 467 | output_shape = list(out_tens.shape) |
| 468 | |
| 469 | if shrink_axis_mask != 0: |
| 470 | n = 0 |
| 471 | axis = 0 |
| 472 | while shrink_axis_mask: |
| 473 | prev_mask = shrink_axis_mask |
| 474 | n += 1 |
| 475 | shrink_axis_mask &= shrink_axis_mask - 1 |
| 476 | axis = int(math.log2(prev_mask - shrink_axis_mask)) |
| 477 | output_shape = output_shape[:axis] + [1] + output_shape[axis:] |
| 478 | |
| 479 | assert len(out_tens.shape) == (len(op.inputs[0].shape) - n) |
| 480 | op.attrs["shrink_axis_mask"] = 0 |
| 481 | if axis >= 0: |
| 482 | axis_4D[idx] = axis + (4 - len(output_shape)) |
| 483 | else: |
| 484 | axis_4D[idx] = axis |
| 485 | op.ofm_shapes[idx] = Shape4D(output_shape) |
| 486 | |
| 487 | elif new_axis_mask != 0: |
| 488 | n = 0 |
| 489 | axis = 0 |
| 490 | while new_axis_mask: |
| 491 | prev_mask = new_axis_mask |
| 492 | n += 1 |
| 493 | new_axis_mask &= new_axis_mask - 1 |
| 494 | axis = int(math.log2(prev_mask - new_axis_mask)) |
| 495 | output_shape = output_shape[:axis] + output_shape[(axis + 1) :] |
| 496 | new_axis_mask >>= 1 |
| 497 | |
| 498 | assert len(out_tens.shape) == (len(op.inputs[0].shape) + n) |
| 499 | op.attrs["new_axis_mask"] = 0 |
| 500 | if axis >= 0: |
| 501 | axis_4D[idx] = axis + (4 - len(output_shape)) |
| 502 | else: |
| 503 | axis_4D[idx] = axis |
| 504 | op.ofm_shapes[idx] = Shape4D(output_shape) |
| 505 | |
| 506 | op.attrs["split_axis_4D"] = axis_4D |
| 507 | return op |
| 508 | |
| 509 | |
| 510 | def rewrite_unpack_output(op, arch, nng): |
| 511 | tens = op.outputs[0] |
| 512 | if op.run_on_npu and op.type == Op.Unpack: |
| 513 | # Unpack is also referred to as Unstack |
| 514 | axis = int(op.attrs["axis"]) |
| 515 | if axis < 0: # Convert to positive axis |
| 516 | axis = len(op.inputs[0].shape) + 1 + axis |
| 517 | op.type = Op.UnpackReshaped |
| 518 | desired_output_shape = tens.shape[:axis] + [1] + tens.shape[axis:] |
| 519 | |
| 520 | axis_4D = axis + (4 - len(desired_output_shape)) |
| 521 | op.attrs["split_axis_4D"] = [axis_4D] * len(op.outputs) |
| 522 | |
| 523 | for idx, out_tens in enumerate(op.outputs): |
| 524 | op.ofm_shapes[idx] = Shape4D(desired_output_shape) |
| 525 | return op |
| 526 | |
| 527 | |
| 528 | def add_padding_fields(op, arch, nng): |
| 529 | if op.run_on_npu: |
| 530 | if "padding" in op.attrs: |
| 531 | input_shape = op.ifm_shapes[0] |
| 532 | output_shape = op.ofm_shapes[0] |
| 533 | if op.type.is_conv2d_op() or op.type.is_depthwise_conv2d_op(): |
| 534 | kernel_size = op.inputs[1].shape[:2] |
| 535 | elif op.type.is_pool_op() or op.type.npu_block_type == NpuBlockType.ReduceSum: |
| 536 | kernel_size = op.attrs["ksize"][1:3] |
| 537 | else: |
| 538 | raise UnsupportedFeatureError(f"Unknown operation that uses padding: {optype_to_builtintype(op.type)}") |
| 539 | |
| 540 | if op.type == Op.Conv2DBackpropInputSwitchedBias: |
| 541 | upscaling_factor = output_shape.height // input_shape.height |
| 542 | padding, skirt = calc_upscaled_padding_and_skirt( |
| 543 | op.attrs["padding"], kernel_size, op.attrs["strides"], input_shape, upscaling_factor |
| 544 | ) |
| 545 | else: |
| 546 | padding, skirt = calc_padding_and_skirt( |
| 547 | op.attrs["padding"], op.kernel, input_shape, op.attrs.get("explicit_padding"), |
| 548 | ) |
| 549 | |
| 550 | op.attrs["explicit_padding"] = padding |
| 551 | op.attrs["skirt"] = skirt |
| 552 | |
| 553 | return op |
| 554 | |
| 555 | |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 556 | def reorder_depthwise_weights(op, arch, nng): |
| 557 | if op.type.is_depthwise_conv2d_op(): |
| 558 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 559 | weight_tensor.values = np.transpose(weight_tensor.values, (0, 1, 3, 2)) |
| 560 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 561 | weight_tensor.weight_transpose_depthwise = True |
| 562 | |
| 563 | return op |
| 564 | |
| 565 | |
| 566 | def optimise_strided_conv(op, arch, nng): |
| 567 | stride_x, stride_y = op.get_kernel_stride() |
| 568 | ifm_tensor, _, weight_tensor, _ = op.get_ifm_ifm2_weights_ofm() |
| 569 | |
| 570 | if ( |
| 571 | op.type == Op.Conv2DBias |
| 572 | and op.op_index == 0 |
| 573 | and stride_x == 2 |
| 574 | and op.ifm_shapes[0].depth <= 4 |
| 575 | and op.ifm_shapes[0].width % 2 == 0 |
| 576 | and weight_tensor is not None |
| 577 | and weight_tensor.shape[1] >= 2 |
| 578 | ): |
| 579 | ifm_shape = op.ifm_shapes[0] |
| 580 | # IFM |
| 581 | op.ifm_shapes[0] = Shape4D([ifm_shape.batch, ifm_shape.height, ifm_shape.width // 2, ifm_shape.depth * 2]) |
| 582 | |
| 583 | # Weights |
| 584 | weight_shape = weight_tensor.shape |
| 585 | if weight_shape[1] % 2 != 0: |
| 586 | weight_shape[1] = weight_shape[1] + 1 |
| 587 | padded_array = np.zeros(weight_shape) |
| 588 | for i in range(weight_shape[0]): |
| 589 | padded_array[i] = np.vstack( |
| 590 | [ |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 591 | weight_tensor.values[i], |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 592 | np.full((1, weight_shape[2], weight_shape[3]), weight_tensor.quantization.zero_point), |
| 593 | ] |
| 594 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 595 | weight_tensor.values = padded_array |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 596 | weight_shape[1] //= 2 |
| 597 | weight_shape[2] *= 2 |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 598 | weight_tensor.values = np.reshape(weight_tensor.values, weight_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 599 | weight_tensor.set_all_shapes(weight_shape) |
| 600 | # If multiple copies of the weights are used, we could avoid |
| 601 | # them having the same address by changing the value_id |
| 602 | weight_tensor.value_id = uuid.uuid4() |
| 603 | |
| 604 | # Strides |
| 605 | stride_x = 1 |
| 606 | op.attrs.update({"stride_w": stride_x, "stride_h": stride_y, "strides": (1, stride_y, stride_x, 1)}) |
| 607 | |
| 608 | return op |
| 609 | |
| 610 | |
| 611 | def convert_conv_to_fc(op, arch, nng): |
| 612 | # Conv 1x1 can be equivalent to Fully Connected. |
| 613 | # By representing certain convs as fully connected layers, Vela can better determine wether or not to use |
| 614 | # caching/double buffering for the weights. |
| 615 | # (Weights dont need to be reloaded for convs when IFM H and W are 1) |
| 616 | if op.type == Op.Conv2DBias: |
| 617 | h = op.ifm_shapes[0].height |
| 618 | w = op.ifm_shapes[0].width |
| 619 | kh, kw, _, _ = op.inputs[1].shape |
| 620 | if h == 1 and w == 1 and kh == 1 and kw == 1: |
| 621 | # Overwrite this op as a Fully Connected Op |
| 622 | op.name += "_fc" |
| 623 | op.type = Op.FullyConnected |
| 624 | op.attrs = { |
| 625 | "weights_format": 0, |
| 626 | } |
| 627 | # Reshape Weights to be 2D. HWIO becomes just IO (as H and W are 1, they can just be dropped) |
| 628 | weight_tensor = op.inputs[1] |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 629 | weight_tensor.values = weight_tensor.values.squeeze(axis=(0, 1)) |
| 630 | weight_tensor.set_all_shapes(list(weight_tensor.values.shape)) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 631 | |
| 632 | DebugDatabase.add_optimised(op, op) |
| 633 | return op |
| 634 | |
| 635 | |
| 636 | def fixup_relus_with_differing_ifm_ofm_scaling(op, arch, nng): |
| 637 | if op.run_on_npu and op.type.is_relu_op(): |
| 638 | ifm = op.inputs[0] |
| 639 | ofm = op.outputs[0] |
| 640 | # Relu with differing IFM and OFM scaling cannot be fused with another primary op |
| 641 | # and requires its own to be inserted |
| 642 | if not check_quantized_tens_scaling_equal(ifm, ofm): |
| 643 | # Override this op with its own primary op (avgpool) |
| 644 | relu_fused_op = create_avgpool_nop(op.name + "_avgpool") |
| 645 | # And fuse the original activation function to it |
| 646 | relu_fused_op.activation = create_activation_function(op.type) |
| 647 | # Tidy up and assign the ifm and ofm to the new op |
| 648 | ifm.consumer_list.remove(op) |
| 649 | |
| 650 | relu_fused_op.add_input_tensor(ifm) |
| 651 | relu_fused_op.set_output_tensor(ofm) |
| 652 | relu_fused_op.set_ifm_ofm_shapes() |
| 653 | op = relu_fused_op |
| 654 | return op |
| 655 | |
| 656 | |
| 657 | def fixup_elementwise_with_scalars(op, arch, nng): |
| 658 | if op.type.is_binary_elementwise_op(): |
| 659 | ifm_tensor, ifm2_tensor, _, _ = op.get_ifm_ifm2_weights_ofm() |
| 660 | if ifm2_tensor.shape != [] and ifm_tensor.shape != []: |
| 661 | diff = len(ifm_tensor.shape) - len(ifm2_tensor.shape) |
| 662 | if diff > 0: |
| 663 | ifm2_tensor.shape = full_shape(len(ifm_tensor.shape), ifm2_tensor.shape, 1) |
| 664 | elif diff < 0: |
| 665 | ifm_tensor.shape = full_shape(len(ifm2_tensor.shape), ifm_tensor.shape, 1) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 666 | elif ifm_tensor.shape == [] and ifm_tensor.values is None: |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 667 | # IFM is marked as a scalar, but is a result of an operation; change it to a shape of size 1 |
| 668 | ifm_tensor.shape = len(ifm2_tensor.shape) * [1] |
| 669 | ifm_tensor.storage_shape = ifm_tensor.shape |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 670 | elif ifm2_tensor.shape == [] and ifm2_tensor.values is None: |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 671 | # IFM2 is marked as a scalar, but is a result of an operation; change it to a shape of size 1 |
| 672 | ifm2_tensor.shape = len(ifm_tensor.shape) * [1] |
| 673 | ifm2_tensor.storage_shape = ifm2_tensor.shape |
| 674 | return op |
| 675 | |
| 676 | |
| 677 | def convert_softmax(op, arch, nng): |
| 678 | if op.type == Op.Softmax and op.run_on_npu: |
| 679 | softmax = SoftMax(op) |
| 680 | op = softmax.get_graph() |
| 681 | return op |
| 682 | |
| 683 | |
| 684 | def convert_mul_max_to_abs_or_lrelu(op, arch, nng): |
| 685 | r"""Whenever there is a subgraph with this topology: |
| 686 | |
| 687 | Input X For X = -1 or X > 0 |
| 688 | | \ / This subgraph can be replaced with either |
| 689 | | Mul an Abs (if X = -1) or a LeakyReLU (if X > 0) |
| 690 | | / |
| 691 | Max |
| 692 | """ |
| 693 | |
| 694 | if op.type == Op.Maximum: |
| 695 | # finds the Mul input(s) to the Max |
| 696 | muls = [i for i in op.inputs if i.ops[0].type == Op.Mul] |
| 697 | if len(muls) == 1: |
| 698 | mul = muls[0].ops[0] |
| 699 | elif len(muls) == 2: |
| 700 | # In the case both inputs are Muls, find the one with the same input as the Max |
| 701 | mul = [m for m in muls if len(set(op.inputs + m.ops[0].inputs)) == 1][0].ops[0] |
| 702 | else: |
| 703 | # No Mul inputs |
| 704 | return op |
| 705 | |
| 706 | # make sure the Mul doesn't have any other consumers |
| 707 | mul_ofm = mul.outputs[0] |
| 708 | if len(mul_ofm.consumers()) != 1: |
| 709 | return op |
| 710 | # make sure the Mul doesn't have a fused activation function |
| 711 | if mul.activation: |
| 712 | return op |
| 713 | ifm, ofm = op.get_ifm_ofm() |
| 714 | if ifm is None or ofm is None: |
| 715 | return op |
| 716 | |
| 717 | if ifm.dtype not in (DataType.uint8, DataType.int8) or ifm.dtype != ofm.dtype: |
| 718 | return op |
| 719 | if not check_quantized_tens_scaling_equal(ifm, ofm) or not check_quantized_tens_scaling_equal(ifm, mul_ofm): |
| 720 | # rewrite to LeakyRelu currently only makes sense if the quantization is identical |
| 721 | return op |
| 722 | |
| 723 | # finds the branched input that goes to both the Max and the Mul |
| 724 | shared = set(op.inputs) & set(mul.inputs) |
| 725 | if len(shared) == 1: |
| 726 | shared_in = shared.pop() |
| 727 | # find the constant scalar input to the Mul |
| 728 | const_tens = (set(mul.inputs) - {shared_in}).pop() |
| 729 | # check that it is a scalar |
| 730 | if const_tens.shape != []: |
| 731 | return op |
| 732 | const = const_tens.ops[0] |
| 733 | # check that it is a constant |
| 734 | if const.type != Op.Const: |
| 735 | return op |
| 736 | # Remove the Mul from the shared input's consumers |
| 737 | shared_in.consumer_list.remove(mul) |
| 738 | else: |
| 739 | return op |
| 740 | |
| 741 | val = const.outputs[0].values |
| 742 | if val >= 0: |
| 743 | new_op = Op.LeakyRelu |
| 744 | op.attrs["alpha"] = val |
| 745 | # to produce bit exact results, the alpha is not enough; |
| 746 | # save additional scaling info in attr "alpha_scale", to be used as input |
| 747 | # to the LUT construction |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 748 | alpha_scalar = const_tens.values - const_tens.quantization.zero_point |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 749 | mul_ifm_scale = np.double(ifm.quantization.scale_f32) |
| 750 | mul_ifm2_scale = np.double(const_tens.quantization.scale_f32) |
| 751 | mul_ofm_scale = np.double(mul_ofm.quantization.scale_f32) |
| 752 | alpha_scale, alpha_shift = scaling.elementwise_mul_scale(mul_ifm_scale, mul_ifm2_scale, mul_ofm_scale) |
| 753 | op.attrs["alpha_scaling"] = (alpha_scalar, alpha_scale, alpha_shift) |
| 754 | elif val == -1: |
| 755 | new_op = Op.Abs |
| 756 | else: |
| 757 | return op |
| 758 | |
| 759 | op.type = new_op |
| 760 | op.name = op.name.replace("Maximum", new_op.name) |
| 761 | op.outputs[0].name = op.outputs[0].name.replace("Maximum", new_op.name) |
| 762 | op.inputs = [shared_in] |
| 763 | op.set_ifm_ofm_shapes() |
| 764 | |
| 765 | # Record optimisation in debug database |
| 766 | DebugDatabase.add_optimised(op, op) |
| 767 | |
| 768 | return op |
| 769 | |
| 770 | |
| 771 | def convert_hardswish_to_lut(op, arch, nng): |
| 772 | if op.type == Op.HardSwish: |
| 773 | ifm, ofm = op.get_ifm_ofm() |
| 774 | # Generate the LUT |
| 775 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 776 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 777 | zp_in = ifm.quantization.zero_point |
| 778 | zp_out = ofm.quantization.zero_point |
| 779 | ifm_scale_hires = (1 / 128) * ifm_scale |
| 780 | relu_multiplier = np.double(3 / 32768) |
| 781 | out_scale, out_shift = scaling.quantise_scale(ifm_scale_hires / ofm_scale) |
| 782 | relu_scale, relu_shift = scaling.quantise_scale(ifm_scale_hires / relu_multiplier) |
| 783 | # Use 16bit scale |
| 784 | out_scale_16 = fp_math.downscale_multiplier_int32_to_int16(out_scale) |
| 785 | relu_scale_16 = fp_math.downscale_multiplier_int32_to_int16(relu_scale) |
| 786 | |
| 787 | values = [] |
| 788 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 789 | quantized_min = min(ix) |
| 790 | quantized_max = max(ix) |
| 791 | for x in ix: |
| 792 | input_value = x - zp_in |
| 793 | input_value_hires = input_value * 128 |
| 794 | # Compute the input value on essentially the output scale, not shifted yet |
| 795 | input_value_preshift = fp_math.saturating_rounding_mul16(input_value_hires, out_scale_16) |
| 796 | # Compute the "relu-ish multiplier". This matches the code in TensorFlow Lite Micro kernel |
| 797 | relu_value = np.int16(input_value_hires) |
| 798 | if relu_shift < 31: |
| 799 | relu_value = fp_math.shift_left16(relu_value, 30 - relu_shift) |
| 800 | |
| 801 | relu_value = fp_math.saturating_rounding_mul16(relu_value, relu_scale_16) |
| 802 | |
| 803 | if relu_shift < 31: |
| 804 | relu_value = fp_math.shift_left16(relu_value, 1) |
| 805 | |
| 806 | if relu_shift > 31: |
| 807 | relu_value = fp_math.rounding_divide_by_pot(relu_value, relu_shift - 31) |
| 808 | |
| 809 | # Rescaled the value into a 16bit fixedpoint relu_value in [-1, 1] |
| 810 | # Now convert that to a 16bit fixedpoint value in [0, 1] |
| 811 | relu_value = (relu_value + (1 << 15)) >> 1 |
| 812 | lut_result = fp_math.saturating_mul16(relu_value, input_value_preshift) |
| 813 | shift = 31 - out_shift |
| 814 | shift = -shift if shift < 0 else 0 |
| 815 | # Finally apply the output shift |
| 816 | lut_result = fp_math.rounding_divide_by_pot(lut_result, shift) + zp_out |
| 817 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 818 | values.append(lut_result) |
| 819 | return convert_to_lut(op, values, "hardswish") |
| 820 | return op |
| 821 | |
| 822 | |
| 823 | def convert_lrelu_to_mul_max(op, arch): |
| 824 | # Converts LeakyRelu to Max(alpha * IFM, identity * IFM) |
| 825 | # (the opposite of convert_mul_max_to_abs_or_lrelu) |
| 826 | ifm, ofm = op.get_ifm_ofm() |
| 827 | if ifm is None or ofm is None: |
| 828 | return op |
| 829 | |
| 830 | # Add multiplication with alpha |
| 831 | mul_alpha = Operation(Op.Mul, op.name + "_mul_alpha") |
| 832 | mul_alpha.add_input_tensor(ifm) |
| 833 | # Create const tensor containing alpha as scalar |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 834 | alpha = np.float32(op.attrs["alpha"]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 835 | quantization = ifm.quantization.clone() |
| 836 | quantization.min = 0 |
| 837 | quantization.max = alpha * (quantization.quant_max - quantization.quant_min) |
| 838 | quantization.zero_point = 0 |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 839 | if np.isinf(1 / alpha): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 840 | # Handling of alpha near zero |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 841 | quantization.scale_f32 = np.float32(1) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 842 | scalar = 0 |
| 843 | else: |
| 844 | quantization.scale_f32 = alpha |
| 845 | scalar = alpha |
| 846 | alpha_tens = create_const_tensor( |
| 847 | op.name + "_alpha_scalar", [], ifm.dtype, [scalar], np.float32, quantization=quantization |
| 848 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 849 | alpha_tens.values = np.array([1]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 850 | mul_alpha.add_input_tensor(alpha_tens) |
| 851 | fm_alpha = ofm.clone(op.name + "_alpha", set_unique=True) |
| 852 | mul_alpha.set_output_tensor(fm_alpha) |
| 853 | mul_alpha.set_ifm_ofm_shapes() |
| 854 | DebugDatabase.add_optimised(op, mul_alpha) |
| 855 | |
| 856 | if check_quantized_tens_scaling_equal(ifm, ofm): |
| 857 | # No identity multiplication is needed |
| 858 | fm_id = ifm |
| 859 | else: |
| 860 | # Add multiplication with identity |
| 861 | mul_identity = Operation(Op.Mul, op.name + "_mul_identity") |
| 862 | mul_identity.add_input_tensor(ifm) |
| 863 | # Create const tensor containing identity as scalar |
| 864 | quantization = ifm.quantization.clone() |
| 865 | quantization.min = 0 |
| 866 | quantization.max = quantization.quant_max - quantization.quant_min |
Fredrik Svedberg | cce872b | 2021-09-02 15:20:52 +0200 | [diff] [blame] | 867 | quantization.scale_f32 = np.float32(1) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 868 | quantization.zero_point = 0 |
| 869 | identity_tens = create_const_tensor( |
| 870 | op.name + "_id_scalar", [], ifm.dtype, [1], np.uint8, quantization=quantization |
| 871 | ) |
| 872 | mul_identity.add_input_tensor(identity_tens) |
| 873 | # Make sure that fm_id is allocated to a different address than fm_alpha |
| 874 | fm_id = ofm.clone(op.name + "_id", set_unique=True) |
| 875 | mul_identity.set_output_tensor(fm_id) |
| 876 | mul_identity.set_ifm_ofm_shapes() |
| 877 | DebugDatabase.add_optimised(op, mul_identity) |
| 878 | |
| 879 | # Convert LeakyRelu to Max, add the results of the multiplication(s) as inputs |
| 880 | op.type = Op.Maximum |
| 881 | op.name = op.name.replace("LeakyRelu", "Maximum") |
| 882 | op.inputs = [] |
| 883 | ifm.consumer_list.remove(op) |
| 884 | op.add_input_tensor(fm_alpha) |
| 885 | op.add_input_tensor(fm_id) |
| 886 | op.set_ifm_ofm_shapes() |
| 887 | |
| 888 | DebugDatabase.add_optimised(op, op) |
| 889 | return op |
| 890 | |
| 891 | |
| 892 | def convert_to_lut(op, lut_values, lut_name): |
| 893 | # Rewrite the operation by Add with scalar 0 + LUT activation |
| 894 | ifm = op.inputs[0] |
| 895 | if ifm is None: |
| 896 | return op |
| 897 | assert ifm.dtype.size_in_bytes() == 1 |
| 898 | op.type = Op.Add |
| 899 | op.name = op.name + "_lut_" + lut_name |
| 900 | # Mark as no-op to enable potential fusing optimizations |
| 901 | op.attrs["is_nop"] = True |
| 902 | # Create an input tensor containing scalar zero |
| 903 | quantization = QuantizationParameters(0.0, 255.0) |
| 904 | quantization.scale_f32 = ifm.quantization.scale_f32 |
| 905 | quantization.zero_point = 0 |
| 906 | tens = create_const_tensor(op.inputs[0].name + "_scalar0", [], ifm.dtype, [0], np.uint8, quantization=quantization) |
| 907 | op.add_input_tensor(tens) |
| 908 | op.ifm_shapes.append(Shape4D(tens.shape)) |
| 909 | |
| 910 | # The LUT must be applied without any preceding rescaling (the LUT itself performs the rescale), |
| 911 | # so even if the OFM has a different scale than the IFM, the generated OFM scale instructions |
| 912 | # should be the same as the IFM |
| 913 | op.forced_output_quantization = ifm.quantization |
| 914 | lut_tensor = lut.create_lut_tensor(op.name + "_values", lut_values, DataType.int8) |
| 915 | op.set_activation_lut(lut_tensor) |
| 916 | op.set_ifm_ofm_shapes() |
| 917 | return op |
| 918 | |
| 919 | |
| 920 | def convert_to_lut8(op, fn, fn_name): |
| 921 | # Converts op to a no-op + int8/uint8 LUT which is generated with the given function. |
| 922 | # fn is a function(real) -> real |
| 923 | ifm, ofm = op.get_ifm_ofm() |
| 924 | if ifm.dtype not in (DataType.uint8, DataType.int8) or ifm.dtype != ofm.dtype: |
| 925 | return op |
| 926 | # Generate the LUT |
| 927 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 928 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 929 | zp_in = ifm.quantization.zero_point |
| 930 | zp_out = ofm.quantization.zero_point |
| 931 | values = [] |
| 932 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 933 | quantized_min = min(ix) |
| 934 | quantized_max = max(ix) |
| 935 | for x in ix: |
| 936 | x_real = ifm_scale * (x - zp_in) |
| 937 | y_real = fn(x_real) |
| 938 | lut_result = round_away_zero(zp_out + y_real / ofm_scale) |
| 939 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 940 | values.append(lut_result) |
| 941 | return convert_to_lut(op, values, fn_name) |
| 942 | |
| 943 | |
| 944 | def convert_lrelu_to_lut(op, arch): |
| 945 | ifm, ofm = op.get_ifm_ofm() |
| 946 | # Generate the LUT |
| 947 | alpha = op.attrs["alpha"] |
| 948 | ifm_scale = np.double(ifm.quantization.scale_f32) |
| 949 | ofm_scale = np.double(ofm.quantization.scale_f32) |
| 950 | zp_in = ifm.quantization.zero_point |
| 951 | zp_out = ofm.quantization.zero_point |
| 952 | identity_scale, identity_shift = scaling.elementwise_mul_scale(ifm_scale, 1, ofm_scale) |
| 953 | alpha_scalar = 1 |
| 954 | alpha_scale, alpha_shift = scaling.elementwise_mul_scale(ifm_scale, alpha, ofm_scale) |
| 955 | if "alpha_scaling" in op.attrs: |
| 956 | # The LeakyRelu was the result from convert_mul_max_to_abs_or_lrelu |
| 957 | alpha_scalar, alpha_scale, alpha_shift = op.attrs["alpha_scaling"] |
| 958 | values = [] |
| 959 | ix = range(256) if ifm.dtype == DataType.uint8 else range(-128, 128) |
| 960 | quantized_min = min(ix) |
| 961 | quantized_max = max(ix) |
| 962 | for x in ix: |
| 963 | if x < zp_in: |
| 964 | lut_result = zp_out + fp_math.multiply_by_quantized_multiplier( |
| 965 | alpha_scalar * (x - zp_in), alpha_scale, alpha_shift |
| 966 | ) |
| 967 | else: |
| 968 | lut_result = zp_out + fp_math.multiply_by_quantized_multiplier(x - zp_in, identity_scale, identity_shift) |
| 969 | lut_result = min(quantized_max, max(quantized_min, lut_result)) |
| 970 | values.append(lut_result) |
| 971 | return convert_to_lut(op, values, "lrelu") |
| 972 | |
| 973 | |
| 974 | def convert_lrelu(op, arch, nng): |
| 975 | # Converts LeakyRelu to a LUT based solution if possible, otherwise a mul + max |
| 976 | if op.type != Op.LeakyRelu: |
| 977 | return op |
| 978 | ifm, ofm = op.get_ifm_ofm() |
| 979 | if ifm is None or ofm is None: |
| 980 | return op |
| 981 | if ifm.dtype in (DataType.uint8, DataType.int8) and ifm.dtype == ofm.dtype: |
| 982 | # use LUT for int8/uint8 |
| 983 | return convert_lrelu_to_lut(op, arch) |
| 984 | if check_quantized_tens_scaling_equal(ifm, ofm) and ifm.dtype == ofm.dtype == DataType.int16: |
| 985 | # use LeakyRelu unmodified for int16 with equal input/output scaling |
| 986 | return op |
| 987 | return convert_lrelu_to_mul_max(op, arch) |
| 988 | |
| 989 | |
| 990 | def convert_tanh_sigmoid_to_lut(op, arch, nng): |
| 991 | # Converts int8/uint8 Sigmoid and Tanh to a LUT based solution |
| 992 | if op.type == Op.Sigmoid: |
| 993 | return convert_to_lut8(op, clamp_sigmoid, "sigmoid") |
| 994 | elif op.type == Op.Tanh: |
| 995 | return convert_to_lut8(op, math.tanh, "tanh") |
| 996 | return op |
| 997 | |
| 998 | |
Jonas Ohlsson | 81942e9 | 2021-08-20 09:33:28 +0200 | [diff] [blame] | 999 | def remove_reshape_and_squeeze_ops(op, arch): |
Jonas Ohlsson | fbfd96e | 2021-08-25 11:38:03 +0200 | [diff] [blame] | 1000 | if op.run_on_npu and op.type in (Op.Reshape, Op.Squeeze): |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1001 | ofm = op.ofm |
| 1002 | ifm = op.ifm |
| 1003 | |
| 1004 | # Check if quantization is the same in the input and output for the reshape ops |
| 1005 | if not check_quantized_tens_scaling_equal(ifm, ofm): |
| 1006 | # TODO Both tensors are needed, since quantisation properties currently are linked to Tensors. |
| 1007 | # In order to remove this reshape either quantization properties need to be moved to Operator, |
| 1008 | # or the reshape need to be replace with a NOP. |
| 1009 | return |
| 1010 | |
Patrik Gustavsson | df99510 | 2021-08-23 15:33:59 +0200 | [diff] [blame^] | 1011 | bypass_reshape_and_squeeze_ops(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1012 | |
| 1013 | |
| 1014 | def fuse_activation_function_with_prev(op, arch, nng): |
| 1015 | # if op is a no-op: attempts to move the activation function to the preceding op |
| 1016 | if not op.attrs.get("is_nop", False) or op.activation is None: |
| 1017 | return op |
| 1018 | ifm, ofm = op.get_ifm_ofm() |
| 1019 | if ifm is None or ofm is None: |
| 1020 | return op |
| 1021 | # finds the input(s) to the operation |
| 1022 | prev_op = ifm.ops[0] |
| 1023 | # Note: the below checks on prev_op require that a first optimize pass on the full graph has been performed |
| 1024 | fuse = ( |
| 1025 | prev_op.run_on_npu |
| 1026 | and prev_op.type.npu_block_type != NpuBlockType.Default |
| 1027 | and len(ifm.ops) == 1 |
| 1028 | and len(prev_op.outputs[0].consumers()) == 1 |
| 1029 | and prev_op.activation is None |
| 1030 | ) |
| 1031 | if op.activation_lut is not None and arch.shram_reserved_unused_banks == 0: |
| 1032 | # TODO: if SHRAM LUT space is shared with SHRAM ACC (32, 64 MAC), |
| 1033 | # LUT currently only works correctly for elementwise ops |
| 1034 | fuse = False |
| 1035 | if not fuse: |
| 1036 | return op |
| 1037 | # Move the fused activation function + corresponding info to prev_op |
| 1038 | prev_op.activation = op.activation |
| 1039 | prev_op.forced_output_quantization = op.forced_output_quantization |
| 1040 | if op.activation_lut is not None: |
| 1041 | prev_op.set_activation_lut(op.activation_lut) |
| 1042 | # Bypass op |
| 1043 | prev_op.set_output_tensor(ofm) |
| 1044 | DebugDatabase.add_optimised(op, prev_op) |
| 1045 | return op |
| 1046 | |
| 1047 | |
| 1048 | def _leading_pad_ok(leading_pad, stride, kernel_size): |
| 1049 | # If kernel size // 2 > stride, then (left, top) padding must be a multiple of stride, |
| 1050 | # otherwise replacing PAD by hardware padding would iterate the wrong IFM rows/columns |
| 1051 | max_size = kernel_size // 2 |
| 1052 | return leading_pad == max_size or max_size <= stride or leading_pad % stride == 0 |
| 1053 | |
| 1054 | |
| 1055 | def replace_pad_by_hw_pad(op: Operation, arch, nng): |
| 1056 | """ |
| 1057 | Tries to completely remove a PAD operator by using hardware padding. |
| 1058 | E.g. a PAD operation that pads 1, followed by a CONV with VALID padding and kernel size 3 |
| 1059 | is rewritten such that the PAD is removed, and the CONV uses SAME padding. |
| 1060 | Converts tens1 -> PAD -> tens2 -> CONV to tens1 -> CONV |
| 1061 | if both operations can be run on the NPU. |
| 1062 | This is the most efficient way to implement PAD, but cannot be done for all pad sizes. |
| 1063 | """ |
| 1064 | if ( |
| 1065 | (op.type.is_conv2d_op() or op.type.is_depthwise_conv2d_op() or op.type.is_avgpool_op()) |
| 1066 | and op.run_on_npu |
| 1067 | and op.attrs["padding"] == Padding.VALID |
| 1068 | ): |
| 1069 | pad_op = op.ifm.ops[0] |
| 1070 | if pad_op.type != Op.Pad or not pad_op.run_on_npu: |
| 1071 | return op |
| 1072 | if pad_op.ifm.dtype != pad_op.ofm.dtype or not check_quantized_tens_scaling_equal(pad_op.ofm, pad_op.ifm): |
| 1073 | return op |
| 1074 | top, left, bottom, right = get_pad_values_from_input(pad_op.inputs[1].values) |
| 1075 | k = op.kernel |
| 1076 | k_w, k_h = k.dilated_wh() |
| 1077 | |
| 1078 | # Check if the PAD operator can be replaced by hardware padding |
| 1079 | if left > k_w // 2 or right > k_w // 2 or top > k_h // 2 or bottom > k_h // 2: |
| 1080 | # Too much padding, it would require hardware padding to actually insert zeros |
| 1081 | return op |
| 1082 | if not _leading_pad_ok(top, k.stride.y, k_h) or not _leading_pad_ok(left, k.stride.x, k_w): |
| 1083 | return op |
| 1084 | |
| 1085 | if op.type.is_avgpool_op(): |
| 1086 | # For average pool, hardware padding can only be used if padding is 0 or kernel size / 2 |
| 1087 | for pad, k_size in ( |
| 1088 | (left, k_w), |
| 1089 | (right, k_w), |
| 1090 | (top, k_h), |
| 1091 | (bottom, k_h), |
| 1092 | ): |
| 1093 | if pad not in (0, k_size // 2): |
| 1094 | return op |
| 1095 | # Average pool is converted to depthwise, because NPU average pool + same padding |
| 1096 | # has a special implementation that is different from PAD followed by average pool with |
| 1097 | # valid padding. |
| 1098 | k_w, k_h = op.kernel.width, op.kernel.height |
| 1099 | ifm = op.ifm |
| 1100 | # Remember other inputs |
| 1101 | other_inputs = op.inputs[1:] |
| 1102 | # Create a weight tensor, all weights are set to 1/(kernel width * kernel height) |
| 1103 | quantization = QuantizationParameters(0.0, 255.0) |
| 1104 | quantization.scale_f32 = 1.0 / (k_w * k_h) |
| 1105 | quantization.zero_point = 0 |
| 1106 | shape = [k_h, k_w, 1, op.ofm.shape[-1]] |
| 1107 | weights = np.full(shape, 1) |
| 1108 | |
| 1109 | weight_tens = create_const_tensor( |
| 1110 | op.name + "_weights", |
| 1111 | shape, |
| 1112 | op.ifm.dtype, |
| 1113 | weights, |
| 1114 | np.uint8, |
| 1115 | purpose=TensorPurpose.Weights, |
| 1116 | quantization=quantization, |
| 1117 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1118 | weight_tens.values = weights |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1119 | op.type = Op.DepthwiseConv2DBias |
| 1120 | op.inputs = [] |
| 1121 | op.add_input_tensor(ifm) |
| 1122 | op.add_input_tensor(weight_tens) |
| 1123 | # Add bias tensor, all biases set to 0 |
| 1124 | op.inputs.append(None) |
| 1125 | fixup_bias_tensors(op, arch, nng) |
| 1126 | # Add other inputs |
| 1127 | op.inputs.extend(other_inputs) |
| 1128 | op.rounding_mode = NpuRoundingMode.NATURAL |
| 1129 | |
| 1130 | # Bypass the PAD operator |
| 1131 | op.set_input_tensor(pad_op.ifm, 0) |
| 1132 | # Adjust the padding attributes of the convolution operator |
| 1133 | op.attrs["padding"] = Padding.EXPLICIT |
| 1134 | op.attrs["explicit_padding"] = (top, left, bottom, right) |
| 1135 | op.set_ifm_ofm_shapes() |
| 1136 | return op |
| 1137 | |
| 1138 | |
| 1139 | def convert_pad(op: Operation, arch, nng): |
| 1140 | """ |
| 1141 | Rewrites PAD operator to an average pool that copies the IFM to the OFM |
| 1142 | + up to 4 average pool operators that fill the OFM with zeros at the borders. |
| 1143 | This is done as fall-back for the PAD operators that remain after replace_pad_by_hw_pad |
| 1144 | """ |
| 1145 | if op.type != Op.Pad or not op.run_on_npu: |
| 1146 | return op |
| 1147 | top, left, bottom, right = get_pad_values_from_input(op.inputs[1].values) |
| 1148 | |
| 1149 | ifm = op.ifm |
| 1150 | assert ifm is not None |
| 1151 | ifm_shape = Shape4D(ifm.shape) |
| 1152 | ofm = op.ofm |
| 1153 | assert ofm is not None |
| 1154 | ofm.ops = [] |
| 1155 | ofm_shape = op.ofm_shapes[0] |
| 1156 | |
| 1157 | # Average pool op that copies IFM to the right place inside the OFM |
| 1158 | shp0 = Shape4D(0, 0, 0, 0) |
| 1159 | shp_top = shp0.with_height(top) |
| 1160 | avgpool_op = create_avg_pool_for_concat(op, op.name + "_main", ifm, ifm_shape, shp_top.with_width(left)) |
| 1161 | avgpool_op.activation = op.activation |
| 1162 | quant = ofm.quantization |
| 1163 | pad_value = quant.zero_point |
| 1164 | # Add operations that fill the borders of the OFM |
| 1165 | if top > 0: |
| 1166 | shape = Shape4D(1, top, ofm_shape.width, ofm_shape.depth) |
| 1167 | zero_tens = create_const_tensor( |
| 1168 | op.name + "_top", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1169 | ) |
| 1170 | # If top/bottom or left/right are equal, the const tensors can be allocated to the same address |
| 1171 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1172 | create_avg_pool_for_concat(op, op.name + "_top", zero_tens, shape, shp0) |
| 1173 | if bottom > 0: |
| 1174 | shape = Shape4D(1, bottom, ofm_shape.width, ofm_shape.depth) |
| 1175 | zero_tens = create_const_tensor( |
| 1176 | op.name + "_bottom", |
| 1177 | shape.as_list(), |
| 1178 | ofm.dtype, |
| 1179 | shape.elements() * [pad_value], |
| 1180 | np.uint8, |
| 1181 | quantization=quant, |
| 1182 | ) |
| 1183 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1184 | create_avg_pool_for_concat( |
| 1185 | op, op.name + "_bottom", zero_tens, shape, shp0.with_height(ofm_shape.height - bottom) |
| 1186 | ) |
| 1187 | if left > 0: |
| 1188 | shape = Shape4D(1, ifm_shape.height, left, ofm_shape.depth) |
| 1189 | zero_tens = create_const_tensor( |
| 1190 | op.name + "_left", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1191 | ) |
| 1192 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1193 | create_avg_pool_for_concat(op, op.name + "_left", zero_tens, shape, shp_top) |
| 1194 | if right > 0: |
| 1195 | shape = Shape4D(1, ifm_shape.height, right, ofm_shape.depth) |
| 1196 | zero_tens = create_const_tensor( |
| 1197 | op.name + "_right", shape.as_list(), ofm.dtype, shape.elements() * [pad_value], np.uint8, quantization=quant |
| 1198 | ) |
| 1199 | zero_tens.equivalence_id = create_equivalence_id(tuple(zero_tens.values)) |
| 1200 | create_avg_pool_for_concat( |
| 1201 | op, op.name + "_right", zero_tens, shape, shp_top.with_width(ofm_shape.width - right) |
| 1202 | ) |
| 1203 | |
| 1204 | op.type = Op.ConcatTFLite |
| 1205 | return avgpool_op |
| 1206 | |
| 1207 | |
| 1208 | def add_attrs_to_resizebilinear(op, arch, nng): |
| 1209 | if op.type == Op.ResizeBilinear and op.run_on_npu: |
| 1210 | input_tensor = op.inputs[0] |
| 1211 | input_shape = op.ifm_shapes[0] |
| 1212 | upscaled_height = input_shape.height * 2 |
| 1213 | upscaled_width = input_shape.width * 2 |
| 1214 | out_shape = op.ofm_shapes[0] |
| 1215 | if not op.attrs["align_corners"] and out_shape.height == upscaled_height and out_shape.width == upscaled_width: |
| 1216 | # this means the output is supposed to be a x2 upscale, |
| 1217 | # so we need to do SAME padding |
| 1218 | op.attrs["padding"] = Padding.SAME |
| 1219 | elif ( |
| 1220 | op.attrs["align_corners"] |
| 1221 | and out_shape.height == (upscaled_height - 1) |
| 1222 | and out_shape.width == (upscaled_width - 1) |
| 1223 | ): |
| 1224 | # here we can just run the avg pool without padding and |
| 1225 | # produce a (M * 2 - 1, N * 2 - 1) sized output |
| 1226 | op.attrs["padding"] = Padding.VALID |
| 1227 | else: |
| 1228 | return op |
| 1229 | input_tensor.resampling_mode = resampling_mode.NEAREST |
| 1230 | op.attrs.update({"strides": (1, 1, 1, 1), "ksize": (1, 2, 2, 1)}) |
| 1231 | return op |
| 1232 | |
| 1233 | |
| 1234 | def fixup_bias_tensors(op, arch, nng): |
| 1235 | if op.type.needs_bias() and op.bias is None: |
| 1236 | # Op has no bias, add bias tensor filled with zeros |
| 1237 | nr_biases = op.inputs[1].shape[-1] |
| 1238 | bias_values = [0] * nr_biases |
| 1239 | 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] | 1240 | op.set_input_tensor(bias_tensor, op.type.info.indices.biases[0]) |
| 1241 | |
| 1242 | return op |
| 1243 | |
| 1244 | |
| 1245 | def convert_mean_to_depthwise_conv_or_avgpool(op, arch, nng): |
| 1246 | if op.type == Op.Mean and op.run_on_npu: |
| 1247 | keep_dims = op.attrs.get("keep_dims", False) |
| 1248 | inp, axis = op.inputs |
| 1249 | shape = inp.shape |
| 1250 | dims = len(shape) |
| 1251 | |
| 1252 | # Height and width axes have different index depending on dimensions |
| 1253 | if axis.shape == [] or axis.shape[0] == 1: # single axis |
| 1254 | axis = int(axis.values) if len(axis.shape) == 0 else int(axis.values[0]) |
| 1255 | if dims in (2, 3): |
| 1256 | if axis == 0: |
| 1257 | h, w = shape[axis], 1 |
| 1258 | else: |
| 1259 | h, w = 1, shape[axis] |
| 1260 | else: |
| 1261 | if axis == 1: |
| 1262 | h, w = shape[axis], 1 |
| 1263 | else: |
| 1264 | h, w = 1, shape[axis] |
| 1265 | else: # multiple axes |
| 1266 | axis = sorted(axis.values) |
| 1267 | h, w = [shape[i] for i in axis] |
| 1268 | |
| 1269 | # Set necessary depthwise attributes |
| 1270 | op.attrs.update( |
| 1271 | { |
| 1272 | "padding": Padding.VALID, |
| 1273 | "stride_h": 1, |
| 1274 | "stride_w": 1, |
| 1275 | "strides": (1, 1, 1, 1), |
| 1276 | "depth_multiplier": 1, |
| 1277 | "channel_multiplier": 1, |
| 1278 | "dilation_h_factor": 1, |
| 1279 | "dilation_w_factor": 1, |
| 1280 | "dilation": (1, 1, 1, 1), |
| 1281 | } |
| 1282 | ) |
| 1283 | # Change op type |
| 1284 | op.type = Op.DepthwiseConv2DBias |
| 1285 | # Set IFM/OFM shapes after changing op type |
| 1286 | op.set_ifm_ofm_shapes() |
| 1287 | |
| 1288 | weight_scale, bias = 1, None |
| 1289 | ofmq, ifmq = op.ofm.quantization, inp.quantization |
| 1290 | # Set rounding mode, scaling and zero point based on which reference implementation to match |
| 1291 | if len(shape) == 4 and axis == [1, 2] and keep_dims: |
| 1292 | if inp.dtype == DataType.uint8: |
| 1293 | # This attribute means a different scaling calculation is used in order to match reference |
| 1294 | op.low_precision_scaling = True |
| 1295 | weight_scale = h * w |
| 1296 | # Set zero points to 0 as they will be adjusted for with bias term |
| 1297 | foq = ofmq.clone() |
| 1298 | foq.zero_point = 0 |
| 1299 | fiq = ifmq.clone() |
| 1300 | fiq.zero_point = 0 |
| 1301 | op.forced_input_quantization = fiq |
| 1302 | bias_term = ofmq.zero_point - int(ifmq.zero_point * ifmq.scale_f32 / ofmq.scale_f32) |
| 1303 | # If the bias term is outside uint8 range, we need an Add op to apply it. |
| 1304 | if bias_term < 0 or bias_term > 255: |
| 1305 | intermediate = op.ofm.clone(suffix="_intermediate", set_unique=True) |
| 1306 | # Bias term has higher bitness (i32) than input/output (u8). |
| 1307 | # 16 bits is enough since the bias is added/subtracted from a u8 value, |
| 1308 | # the bias can only effectively assume values in the range [-255, 255]. |
| 1309 | intermediate.dtype = DataType.int16 |
| 1310 | intermediate.quantization.zero_point = 0 |
| 1311 | add_op = Operation(Op.Add, op.name + "_bias") |
| 1312 | add_op.forced_output_quantization = foq |
| 1313 | add_op.add_input_tensor(intermediate) |
| 1314 | quant = QuantizationParameters() |
| 1315 | quant.zero_point = 0 |
| 1316 | bias_term_tens = create_const_tensor( |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1317 | op.name + "_bias", [1, 1, 1, 1], DataType.int16, [bias_term], np.int16, quantization=quant, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1318 | ) |
| 1319 | add_op.add_input_tensor(bias_term_tens) |
| 1320 | add_op.set_output_tensor(op.ofm) |
| 1321 | add_op.set_ifm_ofm_shapes() |
| 1322 | add_op.activation = op.activation |
| 1323 | op.activation = None |
| 1324 | op.set_output_tensor(intermediate) |
| 1325 | op.set_ifm_ofm_shapes() |
| 1326 | # If not, we can just do it with the OFM zero point. |
| 1327 | else: |
| 1328 | foq.zero_point = bias_term |
| 1329 | op.forced_output_quantization = foq |
| 1330 | else: |
| 1331 | assert inp.dtype == DataType.int8 |
| 1332 | # Use a depthwise to calculate the sum, |
| 1333 | # followed by a multiplication with 1/N to get the MEAN |
| 1334 | weight_scale = 1 |
| 1335 | intermediate = op.ofm.clone(suffix="_intermediate", set_unique=True) |
| 1336 | intermediate.dtype = DataType.int16 |
| 1337 | mul_op = Operation(Op.Mul, op.name + "_mul") |
| 1338 | mul_op.add_input_tensor(intermediate) |
| 1339 | # Create scalar containing 1/N |
| 1340 | quant = QuantizationParameters() |
| 1341 | quant.zero_point = 0 |
| 1342 | # The reference rounds negative numbers downwards, e.g. -1.5 is rounded to -2, |
| 1343 | # while rounding mode NATURAL would round this to -1. |
| 1344 | # This can only occur if N is even, and can be emulated by |
| 1345 | # multiplying with a number that is slightly smaller than 1/N. |
| 1346 | # It must be so small that other roundings are not affected; |
| 1347 | # the calculated value is based on worst case, |
| 1348 | # which is sum 256 * N (the maximum sum that can occur with int8) |
| 1349 | n = int(h * w) |
| 1350 | eps = 1 / (256 * (n + 1)) if n % 2 == 0 else 0 |
| 1351 | quant.scale_f32 = 1 / (n - eps) |
| 1352 | scalar = create_const_tensor( |
| 1353 | op.name + "_scalar", [1, 1, 1, 1], DataType.uint8, [1], np.uint8, quantization=quant |
| 1354 | ) |
| 1355 | mul_op.add_input_tensor(scalar) |
| 1356 | mul_op.set_output_tensor(op.ofm) |
| 1357 | mul_op.set_ifm_ofm_shapes() |
| 1358 | mul_op.rounding_mode = NpuRoundingMode.NATURAL |
| 1359 | mul_op.activation = op.activation |
| 1360 | op.activation = None |
| 1361 | op.set_output_tensor(intermediate) |
| 1362 | op.set_ifm_ofm_shapes() |
| 1363 | elif ifmq.zero_point == ofmq.zero_point and ifmq.scale_f32 == ofmq.scale_f32: |
| 1364 | # Here we can just use a simple AvgPool with truncating rounding, |
| 1365 | # as we're emulating simple integer division. |
| 1366 | op.rounding_mode = NpuRoundingMode.TRUNCATE |
| 1367 | op.type = Op.AvgPool |
| 1368 | op.attrs.update({"ksize": (1, h, w, 1), "filter_height": h, "filter_width": w}) |
| 1369 | else: |
| 1370 | op.rounding_mode = NpuRoundingMode.NATURAL |
| 1371 | weight_scale = 1 / (h * w) |
| 1372 | # Input zero point is adjusted after mean calculation, so we emulate that with a bias |
| 1373 | bias = -ifmq.zero_point * h * w |
| 1374 | fiq = ifmq.clone() |
| 1375 | fiq.zero_point = 0 |
| 1376 | op.forced_input_quantization = fiq |
| 1377 | |
| 1378 | # Change dimensions to 4 |
| 1379 | if dims < 4: |
| 1380 | shape = [1] + shape |
| 1381 | if dims == 2: |
| 1382 | shape += [1] |
| 1383 | |
| 1384 | # If height is greater than max kernel height, reshape to from HxW to 1x(HxW) |
| 1385 | if h > 64: |
| 1386 | shape = [shape[0], 1, h * w, shape[3]] |
| 1387 | op.ifm_shapes[0] = Shape4D(shape) |
| 1388 | if h > 256 and op.type == Op.AvgPool: |
| 1389 | op.attrs.update({"ksize": (1, 1, h * w, 1), "filter_height": 1, "filter_width": h * w}) |
| 1390 | |
| 1391 | # If the AvgPool version is used, we don't need to do anything else |
| 1392 | if op.type == Op.AvgPool: |
| 1393 | return op |
| 1394 | |
| 1395 | # Make unit weight tensor quantization |
| 1396 | weight_quant = ifmq.clone() |
| 1397 | weight_quant.min = 0 |
| 1398 | weight_quant.max = 255 |
| 1399 | weight_quant.scale_f32 = weight_scale |
| 1400 | weight_quant.zero_point = 0 |
| 1401 | |
| 1402 | # Set weight shape to [H,W,C,B] |
| 1403 | weight_shape = shape[1:4] + [shape[0]] |
| 1404 | # Add unit weight tensor |
| 1405 | op.set_input_tensor( |
| 1406 | create_const_tensor( |
| 1407 | "weights", |
| 1408 | weight_shape, |
| 1409 | inp.dtype, |
| 1410 | np.ones(weight_shape), |
| 1411 | value_dtype=np.uint8, |
| 1412 | quantization=weight_quant, |
| 1413 | ), |
| 1414 | 1, |
| 1415 | ) |
James Peet | 7519d50 | 2021-07-19 16:47:58 +0100 | [diff] [blame] | 1416 | op.weights.values = np.reshape(op.inputs[1].values, weight_shape) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1417 | |
| 1418 | # Add None bias tensor |
| 1419 | op.inputs.append(None) |
| 1420 | # Add bias tensor |
| 1421 | if bias: |
| 1422 | bias_shape = [shape[-1]] |
| 1423 | op.set_input_tensor( |
| 1424 | create_const_tensor( |
Tim Hall | 8ae2929 | 2021-07-28 16:52:03 +0100 | [diff] [blame] | 1425 | "bias", bias_shape, inp.dtype, np.ones(bias_shape) * bias, value_dtype=np.int32, quantization=None, |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1426 | ), |
| 1427 | 2, |
| 1428 | ) |
| 1429 | |
| 1430 | return op |
| 1431 | |
| 1432 | |
| 1433 | def supported_operator_check(op, arch, nng): |
Jonas Ohlsson | 45e653d | 2021-07-26 16:13:12 +0200 | [diff] [blame] | 1434 | op.run_on_npu = arch.tflite_supported_operators.is_operator_supported(op) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1435 | return op |
| 1436 | |
| 1437 | |
| 1438 | def tflite_optimise_graph(nng, arch): |
| 1439 | # Pre-processing step |
| 1440 | pre_process_list = [ |
| 1441 | supported_operator_check, |
| 1442 | set_ifm_ofm_op_shapes, |
| 1443 | ] |
| 1444 | |
| 1445 | for idx, sg in enumerate(nng.subgraphs): |
| 1446 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1447 | nng, sg, arch, [], pre_process_list, rewrite_unsupported=False, |
| 1448 | ) |
| 1449 | |
| 1450 | # Handle Concat Ops |
| 1451 | for idx, sg in enumerate(nng.subgraphs): |
| 1452 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [rewrite_concat_ops]) |
| 1453 | sg.refresh_after_modification() |
| 1454 | |
| 1455 | # Handle Split Ops |
| 1456 | for idx, sg in enumerate(nng.subgraphs): |
| 1457 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1458 | nng, |
| 1459 | sg, |
| 1460 | arch, |
| 1461 | [], |
| 1462 | [rewrite_unpack_output, rewrite_stridedslice_output, convert_nop_split_to_identity], |
| 1463 | rewrite_unsupported=False, |
| 1464 | ) |
| 1465 | |
| 1466 | for idx, sg in enumerate(nng.subgraphs): |
| 1467 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1468 | nng, sg, arch, [rewrite_split_ops], [], rewrite_unsupported=False, |
| 1469 | ) |
| 1470 | |
| 1471 | # Handle sg input output |
| 1472 | for idx, sg in enumerate(nng.subgraphs): |
| 1473 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1474 | nng, sg, arch, [], [fix_sg_input_output], rewrite_unsupported=False, |
| 1475 | ) |
| 1476 | |
Jonas Ohlsson | 81942e9 | 2021-08-20 09:33:28 +0200 | [diff] [blame] | 1477 | # Removal of reshapes and squeeze |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1478 | for sg in nng.subgraphs: |
Jonas Ohlsson | 81942e9 | 2021-08-20 09:33:28 +0200 | [diff] [blame] | 1479 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [remove_reshape_and_squeeze_ops]) |
Patrik Gustavsson | 8f1f9aa | 2021-06-28 07:41:58 +0200 | [diff] [blame] | 1480 | sg.refresh_after_modification() |
| 1481 | |
| 1482 | # Rewrite of operators |
| 1483 | op_rewrite_list = [ |
| 1484 | set_tensor_equivalence, |
| 1485 | convert_mean_to_depthwise_conv_or_avgpool, |
| 1486 | convert_depthwise_to_conv, |
| 1487 | convert_conv_to_fc, |
| 1488 | convert_softmax, |
| 1489 | optimise_strided_conv, |
| 1490 | convert_hardswish_to_lut, |
| 1491 | rewrite_fully_connected_input, |
| 1492 | convert_batched_fc_shape, |
| 1493 | fixup_conv2d_backprop, |
| 1494 | fixup_relus_with_differing_ifm_ofm_scaling, |
| 1495 | fixup_elementwise_with_scalars, |
| 1496 | reorder_depthwise_weights, |
| 1497 | fixup_resizebilinear, |
| 1498 | fixup_bias_tensors, |
| 1499 | convert_mul_max_to_abs_or_lrelu, |
| 1500 | convert_lrelu, |
| 1501 | convert_tanh_sigmoid_to_lut, |
| 1502 | replace_pad_by_hw_pad, |
| 1503 | ] |
| 1504 | |
| 1505 | for idx, sg in enumerate(nng.subgraphs): |
| 1506 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1507 | nng, sg, arch, [], op_rewrite_list, rewrite_unsupported=False, |
| 1508 | ) |
| 1509 | |
| 1510 | for idx, sg in enumerate(nng.subgraphs): |
| 1511 | # remove passthrough tensors and attempt further optimizations |
| 1512 | nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order( |
| 1513 | nng, |
| 1514 | sg, |
| 1515 | arch, |
| 1516 | [remove_passthrough_tensor], |
| 1517 | [fuse_activation_function_with_prev, convert_pad, add_padding_fields], |
| 1518 | ) |
| 1519 | |
| 1520 | # Removal of SplitSliceRead, need to be done after optimisation has been performed, |
| 1521 | # since ifm/ofm_shapes are of importance to this function |
| 1522 | for sg in nng.subgraphs: |
| 1523 | rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [remove_SplitSliceRead]) |
| 1524 | sg.refresh_after_modification() |
| 1525 | |
| 1526 | return nng |