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/*
* Copyright (c) 2020 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/FoldDequantizePass.h"
#include <luci/IR/CircleNodes.h>
#include <luci/Profile/CircleNodeOrigin.h>
#include <fp16.h>
namespace
{
bool is_hybrid_kernel_supported(loco::Node *node)
{
if (dynamic_cast<luci::CircleFullyConnected *>(node) != nullptr)
return true;
return false;
}
bool is_foldable_const(luci::CircleConst *node)
{
if (node->dtype() == loco::DataType::FLOAT16)
return true;
if (node->quantparam() == nullptr)
return false;
if (node->dtype() == loco::DataType::S8)
return true;
if (node->dtype() == loco::DataType::U8)
return true;
if (node->dtype() == loco::DataType::S16)
return true;
if (node->dtype() == loco::DataType::S32)
return true;
if (node->dtype() == loco::DataType::S64)
return true;
return false;
}
luci::CircleConst *dequantized_const_node(luci::CircleConst *const_node)
{
auto name = const_node->name();
assert(name.length() > 0);
auto g = const_node->graph();
auto new_const_node = g->nodes()->create<luci::CircleConst>();
new_const_node->dtype(loco::DataType::FLOAT32);
new_const_node->rank(const_node->rank());
uint32_t dim_size = 1;
for (uint32_t i = 0; i < new_const_node->rank(); ++i)
{
new_const_node->dim(i) = const_node->dim(i);
dim_size *= const_node->dim(i).value();
}
new_const_node->size<loco::DataType::FLOAT32>(dim_size);
new_const_node->shape_status(luci::ShapeStatus::VALID);
new_const_node->name(name + "_DQ");
if (const_node->dtype() == loco::DataType::FLOAT16)
{
for (uint32_t i = 0; i < new_const_node->size<loco::DataType::FLOAT32>(); ++i)
{
auto raw = const_node->at<loco::DataType::FLOAT16>(i);
new_const_node->at<loco::DataType::FLOAT32>(i) = fp16_ieee_to_fp32_value(raw);
}
return new_const_node;
}
if (const_node->quantparam() == nullptr)
{
throw std::runtime_error("Given constant node has no quantization parameter");
}
const int32_t q_dim = const_node->quantparam()->quantized_dimension;
// For scalar, q_dim_value is 1
// For non-scalar, q_dim_value is the size of quantized dimension
const int32_t q_dim_value = const_node->rank() == 0 ? 1 : const_node->dim(q_dim).value();
int32_t right_count = q_dim_value;
for (uint32_t i = q_dim + 1; i < const_node->rank(); ++i)
right_count *= const_node->dim(i).value();
for (uint32_t i = 0; i < new_const_node->size<loco::DataType::FLOAT32>(); ++i)
{
uint32_t qd = (i % right_count) / (right_count / q_dim_value);
if (qd >= const_node->quantparam()->zerop.size())
qd = 0;
switch (const_node->dtype())
{
case loco::DataType::S8:
new_const_node->at<loco::DataType::FLOAT32>(i) =
static_cast<float>(const_node->at<loco::DataType::S8>(i) -
const_node->quantparam()->zerop.at(qd)) *
const_node->quantparam()->scale.at(qd);
break;
case loco::DataType::S16:
new_const_node->at<loco::DataType::FLOAT32>(i) =
static_cast<float>(const_node->at<loco::DataType::S16>(i) -
const_node->quantparam()->zerop.at(qd)) *
const_node->quantparam()->scale.at(qd);
break;
case loco::DataType::S32:
new_const_node->at<loco::DataType::FLOAT32>(i) =
static_cast<float>(const_node->at<loco::DataType::S32>(i) -
const_node->quantparam()->zerop.at(qd)) *
const_node->quantparam()->scale.at(qd);
break;
case loco::DataType::S64:
new_const_node->at<loco::DataType::FLOAT32>(i) =
static_cast<float>(const_node->at<loco::DataType::S64>(i) -
const_node->quantparam()->zerop.at(qd)) *
const_node->quantparam()->scale.at(qd);
break;
case loco::DataType::U8:
new_const_node->at<loco::DataType::FLOAT32>(i) =
static_cast<float>(const_node->at<loco::DataType::U8>(i) -
const_node->quantparam()->zerop.at(qd)) *
const_node->quantparam()->scale.at(qd);
break;
default:
throw std::runtime_error("Not supported dtype for FoldDequantizePass");
}
}
return new_const_node;
}
bool replace_const_node(loco::Node *node, luci::CircleConst *const_node)
{
if (auto gather = dynamic_cast<luci::CircleGather *>(node))
{
gather->params(dequantized_const_node(const_node));
gather->dtype(loco::DataType::FLOAT32);
return true;
}
else
{
// TODO Support more ops
return false;
}
}
} // namespace
namespace luci
{
/**
*
* Folding pattern 1 - When input of Dequantize is foldable constant
*
* [Before]
* quantized_const_input ---------- Dequantize ---------- Op ---
* +-- Op1_with_quant_input ---
* +-- Op2_with_quant_input ---
*
* [After]
* dequantized_const_input -------------------------------- Op ---
*
* quantized_const_input ----- Op1_with_quant_input ---
* +-- Op2_with_quant_input ---
*
*
* Folding pattern 2 - When input of Dequantize uses quantized output value
*
* [Before]
* quantized_const_input ----- Gather ----- Dequantize --- Op ---
* +-- Op1_with_quant_input ---
* +-- Op2_with_quant_input ---
*
* [After]
* dequantized_const_input ------Gather -------------------- Op ---
*
* quantized_const_input ----- Op1_with_quant_input ---
* +-- Op2_with_quant_input ---
*
*
*/
bool FoldDequantizePass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
if (auto circle_dequant = dynamic_cast<luci::CircleDequantize *>(node))
{
if (auto const_input = dynamic_cast<luci::CircleConst *>(circle_dequant->input()))
{
// Pattern 1 - When input of Dequantize is foldable constant
if (is_foldable_const(const_input))
{
loco::replace(circle_dequant).with(dequantized_const_node(const_input));
changed = true;
}
}
}
else if (auto const_node = dynamic_cast<luci::CircleConst *>(node))
{
if (is_foldable_const(const_node))
{
for (auto const_node_user : loco::succs(const_node))
{
// If user is hybrid kernel supported operation, do not dequantize
if (is_hybrid_kernel_supported(const_node_user))
continue;
auto users = loco::succs(const_node_user);
if (users.size() > 1)
continue;
// Pattern 2 - When input of Dequantize uses quantized output value
if (auto dequant = dynamic_cast<luci::CircleDequantize *>(*users.begin()))
{
if (replace_const_node(const_node_user, const_node))
{
loco::replace(dequant).with(const_node_user);
luci::add_origin(loco::must_cast<luci::CircleNode *>(const_node_user),
luci::get_origin(dequant));
changed = true;
}
}
}
}
}
}
return changed;
}
} // namespace luci
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