/* Copyright (c) 2018 PaddlePaddle Authors. 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. */

#pragma once

#include <string>
#include "paddle/fluid/framework/ir/fuse_pass_base.h"
#include "paddle/fluid/framework/ir/graph.h"
#include "paddle/fluid/framework/ir/graph_pattern_detector.h"

namespace paddle {
namespace framework {
namespace ir {

/**
 * Fuse SequencePool(with sum pooltype yet) and Concat;
 *
 * Before fuse:
 *    |         |             |
 * seq_pool, seq_pool, ... seq_pool
 *    \         |      ...   /
 *            concat
 *              |
 * After fuse:
 *    \      |       /
 *   FusionSeqPoolConcat
 *           |
 */
class SeqPoolConcatFusePass : public FusePassBase {
 public:
  virtual ~SeqPoolConcatFusePass() {}

 protected:
  std::unique_ptr<ir::Graph> ApplyImpl(std::unique_ptr<ir::Graph> graph) const;

  const std::string name_scope_{"seqpool_concat_fuse"};
};

}  // namespace ir
}  // namespace framework
}  // namespace paddle