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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/ExpandBroadcastConstPass.h"
#include <luci/IR/CircleNodes.h>
#include <luci/Log.h>
#include <type_traits>
namespace
{
luci::CircleConst *create_expanded_constant(luci::CircleConst *node, luci::CircleNode *successor)
{
LOGGER(l);
if (successor->rank() != node->rank())
return nullptr;
std::vector<uint32_t> broadcast_dims;
for (uint32_t dim = 0; dim < node->rank(); ++dim)
{
if (node->dim(dim) == successor->dim(dim))
continue;
if (node->dim(dim) == 1)
broadcast_dims.push_back(dim);
}
if (broadcast_dims.size() != 1 || broadcast_dims.back() != node->rank() - 1)
{
WARN(l) << "NYI: Only depth broadcast removal is supported";
return nullptr;
}
auto constant = node->graph()->nodes()->create<luci::CircleConst>();
constant->name(node->name());
constant->dtype(node->dtype());
constant->rank(node->rank());
constant->shape_status(luci::ShapeStatus::VALID);
uint32_t node_size = node->size<loco::DataType::FLOAT32>();
uint32_t constant_size = 1;
for (uint32_t i = 0; i < successor->rank(); ++i)
{
constant->dim(i).set(successor->dim(i).value());
constant_size *= constant->dim(i).value();
}
constant->size<loco::DataType::FLOAT32>(constant_size);
auto const node_data = &node->at<loco::DataType::FLOAT32>(0);
auto const constant_data = &constant->at<loco::DataType::FLOAT32>(0);
auto const successor_depth = successor->dim(successor->rank() - 1).value();
for (uint32_t d = 0; d < successor_depth; ++d)
std::copy(node_data, node_data + node_size, constant_data + d * node_size);
return constant;
}
template <typename N> bool expand_node_input(luci::CircleConst *node, luci::CircleNode *successor)
{
static_assert(std::is_base_of<luci::CircleNode, N>::value,
"Successor node should have CircleNode base");
auto const successor_node = loco::must_cast<N *>(successor);
auto const successor_x = loco::must_cast<luci::CircleNode *>(successor_node->x());
auto const successor_y = loco::must_cast<luci::CircleNode *>(successor_node->y());
luci::CircleConst *expanded_const;
if (node == successor_x)
{
expanded_const = create_expanded_constant(node, successor_y);
if (expanded_const == nullptr)
return false;
successor_node->x(expanded_const);
}
else if (node == successor_y)
{
expanded_const = create_expanded_constant(node, successor_x);
if (expanded_const == nullptr)
return false;
successor_node->y(expanded_const);
}
return true;
}
/**
* Expand constants following broadcasting rules for binary input nodes (Add, Mul, etc.)
*
* BEFORE
*
* [CircleInput] [CircleConst (H x W x 1)]
* | |
* [CircleAdd]
*
* AFTER
*
* [CircleInput] [CircleConst (H x W x D)]
* | |
* [CircleAdd]
*/
bool expand_broadcast_const(luci::CircleConst *node)
{
if (node->dtype() != loco::DataType::FLOAT32)
return false; // Unsupported data type
bool changed = false;
for (auto successor : loco::succs(node))
{
auto const circle_successor = loco::must_cast<luci::CircleNode *>(successor);
switch (circle_successor->opcode())
{
case luci::CircleOpcode::ADD:
if (expand_node_input<luci::CircleAdd>(node, circle_successor))
changed = true;
break;
case luci::CircleOpcode::MUL:
if (expand_node_input<luci::CircleMul>(node, circle_successor))
changed = true;
break;
case luci::CircleOpcode::DIV:
if (expand_node_input<luci::CircleDiv>(node, circle_successor))
changed = true;
break;
default:
break; // Unsupported successor node
}
}
return changed;
}
} // namespace
namespace luci
{
/**
* Broadcast expanding for Const nodes
**/
bool ExpandBroadcastConstPass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
auto const_node = dynamic_cast<luci::CircleConst *>(node);
if (const_node == nullptr)
continue;
if (expand_broadcast_const(const_node))
changed = true;
}
return changed;
}
} // namespace luci
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