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/*
* Copyright (c) 2019 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 "FoldReshapeOfConstPass.h"
#include "Check.h"
#include "Dialect/IR/TFLNodes.h"
#include "Dialect/IR/TFLNodeVisitor.h"
#include <loco/Service/ShapeInference.h>
#include <oops/InternalExn.h>
namespace
{
/**
* @brief Check if node is TFLReshape and its input is TFLConst
* @return Casted TFLReshape for foldable candidate, nullptr otherwise
*/
locoex::TFLReshape *as_candidate(loco::Node *node)
{
auto reshape = dynamic_cast<locoex::TFLReshape *>(node);
if (not reshape)
return nullptr;
// Only accept Constant input of Reshape
if (not dynamic_cast<locoex::TFLConst *>(reshape->tensor()))
return nullptr;
return reshape;
}
uint32_t volume(loco::Node *tensor_node)
{
auto shape = loco::shape_get(tensor_node).as<loco::TensorShape>();
uint32_t vol = 1;
for (uint32_t axis = 0; axis < shape.rank(); ++axis)
vol *= shape.dim(axis).value();
return vol;
}
void fold_reshape_of_const(locoex::TFLReshape *reshape)
{
const loco::DataType FLOAT32 = loco::DataType::FLOAT32;
auto const_orig = dynamic_cast<locoex::TFLConst *>(reshape->tensor());
// Exceptions
{
EXO_ASSERT(const_orig, "Only support for Reshape-Const pair");
// TODO support other data types
if (const_orig->dtype() != FLOAT32)
INTERNAL_EXN_V("NYI for this data type", oops::to_uint32(const_orig->dtype()));
if (volume(const_orig) != volume(reshape))
INTERNAL_EXN("New shape of Reshape is not matched");
}
auto new_shape = loco::shape_get(reshape).as<loco::TensorShape>();
// TFLConst to replace
auto const_new = reshape->graph()->nodes()->create<locoex::TFLConst>();
const_new->dtype(FLOAT32);
const_new->rank(new_shape.rank());
const_new->size<FLOAT32>(const_orig->size<FLOAT32>());
for (uint32_t axis = 0; axis < new_shape.rank(); ++axis)
const_new->dim(axis) = new_shape.dim(axis);
for (uint32_t i = 0; i < const_new->size<FLOAT32>(); ++i)
{
const_new->at<FLOAT32>(i) = const_orig->at<FLOAT32>(i);
}
// replace
loco::replace(reshape).with(const_new);
}
} // namespace
namespace exo
{
bool FoldReshapeOfConstPass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
if (auto reshape = as_candidate(node))
{
fold_reshape_of_const(reshape);
changed = true;
}
}
return changed;
}
} // namespace exo
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