Pooling.cpp

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/*
 * Copyright (c) 2018 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 "Pooling.h"
#include "PoolingSpec.h"
#include "IRBuilder.h"
 
#include <coco/IR/FeatureLayouts.h>
 
#include <morph/caffe.h>
 
#include <cassert>
#include <functional>
 
using namespace nncc::core::ADT;
using namespace morph::caffe;
 
namespace caffeimport
{
 
void PoolingBuilder::build(const ::caffe::LayerParameter &layer, GraphBuilderContext *context) const
{
  coco::Module *module = context->module();
  coco::Block *blk = context->block();
  std::map<std::string, tensor::Shape> &shape_ctx = context->shape_ctx();
  std::map<std::string, coco::Bag *> &bag_ctx = context->bag_ctx();
 
  assert(layer.bottom().size() == 1);
  assert(layer.top().size() == 1);
 
  assert(layer.has_pooling_param());
  const auto &param = layer.pooling_param();
 
  PoolingSpec spec{param};
  {
    const auto ifm_name = layer.bottom(0);
    const auto ifm_shape = shape_ctx.at(ifm_name);
    spec.ifm_shape(ifm_shape);
  }
 
  // Create an object for an input feature map
  const auto ifm_name = layer.bottom(0);
  const auto ifm_shape = shape_ctx.at(ifm_name);
  auto ifm_bag = bag_ctx.at(ifm_name);
  auto ifm_obj = module->entity()->object()->create<coco::FeatureObject>();
 
  ifm_obj->bag(ifm_bag);
  ifm_obj->layout(coco::FeatureLayouts::BCHW::create(as_feature_shape(ifm_shape)));
 
  // Create an object for an output feature map
  const auto ofm_name = layer.top(0);
  const auto ofm_shape = spec.ofm_shape();
  auto ofm_bag = module->entity()->bag()->create(num_elements(ofm_shape));
  auto ofm_obj = module->entity()->object()->create<coco::FeatureObject>();
 
  ofm_obj->bag(ofm_bag);
  ofm_obj->layout(coco::FeatureLayouts::BCHW::create(as_feature_shape(ofm_shape)));
 
  using PoolingOpBuilder = std::function<coco::Op *(coco::Module * m, const PoolingSpec &spec)>;
 
  std::map<PoolingMethod, PoolingOpBuilder> builders;
 
  // MaxPool2D op builder
  builders[PoolingMethod::Max] = [ifm_obj](coco::Module *module, const PoolingSpec &spec) {
    auto load = op_builder(module).load(ifm_obj).pop();
 
    auto op = module->entity()->op()->create<coco::MaxPool2D>();
 
    op->arg(load);
 
    op->window()->height(spec.window_height());
    op->window()->width(spec.window_width());
 
    op->stride()->vertical(spec.vertical_stride());
    op->stride()->horizontal(spec.horizontal_stride());
 
    op->pad()->top(spec.vertical_pad());
    op->pad()->bottom(spec.vertical_pad());
    op->pad()->left(spec.horizontal_pad());
    op->pad()->right(spec.horizontal_pad());
 
    return op;
  };
 
  // AvgPool2D op builder
  builders[PoolingMethod::Avg] = [ifm_obj](coco::Module *module, const PoolingSpec &spec) {
    auto load = op_builder(module).load(ifm_obj).pop();
 
    auto op = module->entity()->op()->create<coco::AvgPool2D>();
 
    op->arg(load);
 
    // NOTE Caffe use static divisor on average pooling
    op->divisor(coco::AvgPool2D::Divisor::Static);
 
    op->window()->height(spec.window_height());
    op->window()->width(spec.window_width());
 
    op->stride()->vertical(spec.vertical_stride());
    op->stride()->horizontal(spec.horizontal_stride());
 
    op->pad()->top(spec.vertical_pad());
    op->pad()->bottom(spec.vertical_pad());
    op->pad()->left(spec.horizontal_pad());
    op->pad()->right(spec.horizontal_pad());
 
    return op;
  };
 
  // Create a pooling op
  auto builder = builders.at(spec.method());
  auto op = builder(module, spec);
 
  // Create a UnitF instruction
  auto ins = instr_builder(module).eval(ofm_obj, op);
 
  // Append the instruction to the block
  blk->instr()->append(ins);
 
  // Update bag and shape context
  bag_ctx[ofm_name] = ofm_bag;
  shape_ctx[ofm_name] = ofm_shape;
}
 
} // namespace caffeimport