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/*
* Copyright (c) 2021 Samsung Electronics Co., Ltd. All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "luci/Pass/FuseBatchNormWithDwConvPass.h"
#include "helpers/NodeFiller.h"
#include <luci/IR/CircleNodes.h>
#include <luci/Profile/CircleNodeOrigin.h>
namespace
{
/**
* Fuse Mul-Add to DepthwiseConv2D if possible.
*
* NOTE TF's BatchNormalization is converted to Mul and Add.
*
* BEFORE
* | [CircleConst]
* | / [CircleConst]
* | / /
* [CircleDepthwiseConv2D] [CircleConst]
* | /
* [CircleMul] [CircleConst]
* | /
* [CircleAdd]
* |
*
* AFTER
* | [CircleConst]
* +-------------------------------------+ / [CircleConst]
* | | / /
* | [CircleDepthwiseConv2D] [CircleConst]
* | [CircleConst] | /
* | / [CircleConst] [CircleMul] [CircleConst]
* | / / | /
* [CircleDepthwiseConv2D] [CircleAdd]
* |
*
*/
/**
* @brief Check shape is [x] or [1, 1, 1, x]
*/
bool is_scale_shift_shape(luci::CircleConst *node)
{
auto rank = node->rank();
if (rank != 1 && rank != 4)
return false;
for (uint32_t r = 0; r < rank - 1; ++r)
{
if (node->dim(r).value() != 1)
return false;
}
return true;
}
bool fused_batch_norm_with_dwconv(luci::CircleAdd *add)
{
assert(add != nullptr);
// Find the pattern of CircleDepthwiseConv2D - CircleMul - CircleAdd
luci::CircleConst *scale = nullptr;
luci::CircleConst *shift = nullptr;
luci::CircleDepthwiseConv2D *dwconv = nullptr;
luci::CircleMul *mul = nullptr;
if (not luci::fill(&shift, &mul).with_commutative_args_of(add))
return false;
if (not luci::fill(&scale, &dwconv).with_commutative_args_of(mul))
return false;
// check scale and shift constant attributes
// scale and shift can be [x] or [1, 1, 1, x]
if (not is_scale_shift_shape(scale))
return false;
if (not is_scale_shift_shape(shift))
return false;
// check mul, add attributes
if (mul->dtype() != loco::DataType::FLOAT32)
return false;
if (mul->fusedActivationFunction() != luci::FusedActFunc::NONE)
return false;
if (add->dtype() != loco::DataType::FLOAT32)
return false;
// get weight of dwconv
auto filter = dynamic_cast<luci::CircleConst *>(dwconv->filter());
if (not filter)
return false;
if (filter->dtype() != loco::DataType::FLOAT32)
return false;
if (filter->rank() != 4)
return false;
// check attributes of dwconv
if (dwconv->fusedActivationFunction() != luci::FusedActFunc::NONE)
return false;
if (dwconv->depthMultiplier() < 0) // can this happen?
return false;
// get bias of dwconv
auto bias = dynamic_cast<luci::CircleConst *>(dwconv->bias());
if (not bias)
return false;
if (bias->dtype() != loco::DataType::FLOAT32)
return false;
if (bias->rank() != 1)
return false;
// filter represents as [1, H, W, C*M] where M is multiplier.
auto filter_out_chn = filter->dim(3).value();
auto multiplier = static_cast<uint32_t>(dwconv->depthMultiplier());
auto srank = scale->rank(); // as rank can be 1 or 4
if (filter_out_chn != scale->dim(srank - 1).value() * multiplier)
return false;
srank = shift->rank();
if (filter_out_chn != shift->dim(srank - 1).value() * multiplier)
return false;
auto channel = filter_out_chn / multiplier;
auto name = add->name();
assert(name.length() > 0);
loco::Graph *graph = add->graph();
luci::CircleDepthwiseConv2D *fused_dwconv = graph->nodes()->create<luci::CircleDepthwiseConv2D>();
luci::CircleConst *fused_filter = graph->nodes()->create<luci::CircleConst>();
luci::CircleConst *fused_bias = graph->nodes()->create<luci::CircleConst>();
auto filter_in_chn = filter->dim(0).value();
auto filter_height = filter->dim(1).value();
auto filter_width = filter->dim(2).value();
assert(filter_in_chn == 1);
// Copy filter shape
fused_filter->dtype(filter->dtype());
fused_filter->size<loco::DataType::FLOAT32>(filter->size<loco::DataType::FLOAT32>());
fused_filter->rank(4);
fused_filter->dim(0).set(filter_in_chn);
fused_filter->dim(1).set(filter_height);
fused_filter->dim(2).set(filter_width);
fused_filter->dim(3).set(filter_out_chn);
fused_filter->shape_status(luci::ShapeStatus::VALID);
fused_filter->name(name + "/DepthwiseConv2D/filter");
// fused filter weight = filter weight * mul(scale) + add(shift)
for (uint32_t b = 0; b < filter_in_chn; b++)
{
for (uint32_t h = 0; h < filter_height; h++)
{
for (uint32_t w = 0; w < filter_width; w++)
{
for (uint32_t c = 0; c < filter_out_chn; c++)
{
uint32_t offset = b * filter_height * filter_width * filter_out_chn +
h * filter_width * filter_out_chn + w * filter_out_chn + c;
uint32_t chn = c / multiplier;
fused_filter->at<loco::DataType::FLOAT32>(offset) =
filter->at<loco::DataType::FLOAT32>(offset) * scale->at<loco::DataType::FLOAT32>(chn);
}
}
}
}
// Fuse bias with scale and shift
fused_bias->dtype(shift->dtype());
fused_bias->size<loco::DataType::FLOAT32>(shift->size<loco::DataType::FLOAT32>());
fused_bias->rank(1);
fused_bias->dim(0).set(channel);
fused_bias->shape_status(luci::ShapeStatus::VALID);
for (uint32_t c = 0; c < channel; ++c)
{
fused_bias->at<loco::DataType::FLOAT32>(c) =
bias->at<loco::DataType::FLOAT32>(c) * scale->at<loco::DataType::FLOAT32>(c) +
shift->at<loco::DataType::FLOAT32>(c);
}
fused_bias->name(name + "/DepthwiseConv2D/bias");
// set new tconv properties
fused_dwconv->input(dwconv->input());
fused_dwconv->filter(fused_filter);
fused_dwconv->bias(fused_bias);
fused_dwconv->fusedActivationFunction(add->fusedActivationFunction());
fused_dwconv->padding(dwconv->padding());
fused_dwconv->stride()->h(dwconv->stride()->h());
fused_dwconv->stride()->w(dwconv->stride()->w());
fused_dwconv->depthMultiplier(dwconv->depthMultiplier());
fused_dwconv->dilation()->h(dwconv->dilation()->h());
fused_dwconv->dilation()->w(dwconv->dilation()->w());
fused_dwconv->name(name + "/DepthwiseConv2D");
luci::add_origin(fused_dwconv,
luci::composite_origin(
{luci::get_origin(add), luci::get_origin(mul), luci::get_origin(dwconv)}));
replace(add).with(fused_dwconv);
return true;
}
} // namespace
namespace luci
{
bool FuseBatchNormWithDwConvPass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
if (auto add = dynamic_cast<luci::CircleAdd *>(node))
{
if (fused_batch_norm_with_dwconv(add))
changed = true;
}
}
return changed;
}
} // namespace luci
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