MaxPool2D.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 "MaxPool2D.h"
 
#include "Convert.h"
#include "IRBuilder.h"
#include "GraphBuilder.h"
#include "Padding.h"
#include "Activation.h"
 
#include <morph/tflite.h>
#include <coco/IR/Module.h>
#include <coco/IR/FeatureLayouts.h>
 
#include <nncc/core/ADT/tensor/Shape.h>
#include <schema_generated.h>
 
#include <cassert>
 
using namespace nncc::core::ADT;
using namespace morph::tflite;
 
namespace tflimport
{
 
bool MaxPool2DGraphBuilder::validate(const tflite::Operator *op) const
{
  auto const options = op->builtin_options_as_Pool2DOptions();
 
  if ((options->stride_h() == 0) || (options->stride_w() == 0))
  {
    return false;
  }
 
  return true;
}
 
void MaxPool2DGraphBuilder::build(const tflite::Operator *op, GraphBuilderContext *context) const
{
  assert(context != nullptr); // check if init(..) is called
 
  coco::Module *m = context->m();
  coco::Block *blk = context->block();
  TensorContext &tensor_context = context->tensor();
  TensorBags &bags = context->bags();
 
  IndexVector opinputs = as_index_vector(op->inputs());
  IndexVector opoutputs = as_index_vector(op->outputs());
 
  // these are fixed in tflite
  // input index 0 : input feature
  // output index 0 : output feature
  assert(opinputs.size() == 1);
  assert(opoutputs.size() == 1);
 
  int ifm_idx = opinputs.at(0);
  int ofm_idx = opoutputs.at(0);
 
  const tensor::Shape &ifm_shape = tensor_context.shape(ifm_idx);
  const tensor::Shape &ofm_shape = tensor_context.shape(ofm_idx);
 
  // Create an object for an input feature map
  coco::FeatureObject *ifm_obj = m->entity()->object()->create<coco::FeatureObject>();
  coco::Bag *ifm_bag = bags.bag(ifm_idx);
  ifm_obj->bag(ifm_bag);
  ifm_obj->layout(coco::FeatureLayouts::BHWC::create(as_feature_shape(ifm_shape)));
 
  // Create an object for an output feature map
  coco::FeatureObject *ofm_obj = m->entity()->object()->create<coco::FeatureObject>();
  coco::Bag *ofm_bag = bags.bag(ofm_idx);
  ofm_obj->bag(ofm_bag);
  ofm_obj->layout(coco::FeatureLayouts::BHWC::create(as_feature_shape(ofm_shape)));
 
  // Create a Load op
  coco::Op *coco_load = op_builder(m).load(ifm_obj).pop();
 
  // Create a MaxPool2D
  coco::MaxPool2D *coco_maxpool2d = m->entity()->op()->create<coco::MaxPool2D>();
  const tflite::Pool2DOptions *params = op->builtin_options_as_Pool2DOptions();
 
  coco_maxpool2d->window()->height(params->filter_height());
  coco_maxpool2d->window()->width(params->filter_width());
 
  coco_maxpool2d->stride()->vertical(params->stride_h());
  coco_maxpool2d->stride()->horizontal(params->stride_w());
 
  coco::Padding2D padding =
    pool2D_padding(params, ifm_shape, params->filter_width(), params->filter_height());
 
  coco_maxpool2d->pad()->top(padding.top());
  coco_maxpool2d->pad()->bottom(padding.bottom());
  coco_maxpool2d->pad()->left(padding.left());
  coco_maxpool2d->pad()->right(padding.right());
 
  // Link ops
  coco_maxpool2d->arg(coco_load);
 
  // Create an Eval instruction
  coco::Eval *ins = instr_builder(m).eval(ofm_obj, coco_maxpool2d);
 
  // Append the instruction to the block
  blk->instr()->append(ins);
 
  // TODO activation, e.g., relu
  assert(params->fused_activation_function() ==
         tflite::ActivationFunctionType::ActivationFunctionType_NONE);
}
 
} // namespace tflimport