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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 <logo/ResolveDuplicateReshapePass.h>
#include <loco.h>
#include <cassert>
namespace
{
/// @return true when 'node' and its input node are both FixedReshapes
bool is_duplicate_reshape(loco::Node *node)
{
auto node_as_reshape = dynamic_cast<loco::FixedReshape *>(node);
if (!node_as_reshape)
return false;
auto input_as_reshape = dynamic_cast<loco::FixedReshape *>(node_as_reshape->input());
if (!input_as_reshape)
return false;
return true;
}
/**
* @brief Remap reshape's input to its input's input, i.e. bypass input reshape
*
* Before:
*
* In ----- FixedReshape_1 ----- [Out_1]*
* \
* ------- FixedReshape_2 --- [Out_2]*
* ('reshape' arg)
*
* After:
*
* In ----- FixedReshape_1 ----- [Out_1]*
* \
* --------------------------- FixedReshape_2 --- [Out_2]*
*
* Note: In case of no Out_1, FixedReshape_1 becomes dead node.
* Out_1 can be another FixedReshape as well, which would be resolved in
* another occurance of this transform pass.
*/
void remap_input(loco::FixedReshape *reshape)
{
auto input_reshape = dynamic_cast<loco::FixedReshape *>(reshape->input());
auto volume = [](loco::FixedReshape *node) {
uint32_t vol = 1;
for (uint32_t axis = 0; axis < node->rank(); ++axis)
{
assert(node->dim(axis).known());
vol *= node->dim(axis).value();
}
return vol;
};
// Volume mismatch between duplicate reshapes is pointless
assert(volume(reshape) == volume(input_reshape));
// Set node's input as input's input, i.e. bypass
reshape->input(input_reshape->input());
}
} // namespace
namespace logo
{
bool ResolveDuplicateReshapePass::run(loco::Graph *graph)
{
auto outputs = loco::output_nodes(graph);
bool changed = false;
for (auto node : loco::postorder_traversal(outputs))
{
if (is_duplicate_reshape(node))
{
auto node_as_reshape = dynamic_cast<loco::FixedReshape *>(node);
remap_input(node_as_reshape);
changed = true;
}
}
return changed;
}
} // namespace logo
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