SequencePoolLayer.h 2.1 KB
Newer Older
1
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

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 "Layer.h"
#include "paddle/math/Matrix.h"

namespace paddle {
/**
 * A base layer for SequenceLastInstanceLayer/AverageLayer/MaxLayer.
 *
 * Input: one or more sequences. Each sequence contains some instances.
 * If SequenceLevel = kNonSeq:
 *    Output: output size is the number of input sequences (NOT input instances)
 *    output[i] = seqlastin/average/max_{for each instance in this
 * sequence}{input[i]}
29 30 31 32
 *    If stride_ > 0:
 *        Check input sequence must don't have sub-sequence
 *        Output: a shorten sequence, pooling is performed upon a small local
 * area
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
 * If SequenceLevel = kSeq:
 *    Check input sequence must has sub-sequence
 *    Output: output size is the number of input sub-sequences
 *    output[i] = seqlastin/average/max_{for each instance in this
 * sub-sequence}{input[i]}
 *
 * The config file api is pooling_layer.
 */

class SequencePoolLayer : public Layer {
protected:
  int type_;
  std::unique_ptr<Weight> biases_;
  enum SequenceLevel { kNonSeq = 0, kSeq = 1 };
  size_t newBatchSize_;
  ICpuGpuVectorPtr startPositions_;
49 50 51
  int stride_;
  // store the start position of each stride window
  std::vector<int> stridePositions_;
52 53 54 55

public:
  explicit SequencePoolLayer(const LayerConfig& config) : Layer(config) {}

Y
Yu Yang 已提交
56 57
  bool init(const LayerMap& layerMap,
            const ParameterMap& parameterMap) override;
58

Y
Yu Yang 已提交
59 60
  void forward(PassType passType) override;
  void backward(const UpdateCallback& callback = nullptr) override;
61 62 63
};

}  // namespace paddle