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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
///////////////////////////////////////////////////////////////////////
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// File: maxpool.h
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// Description: Standard Max-Pooling layer.
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// Author: Ray Smith
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// Created: Tue Mar 18 16:28:18 PST 2014
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//
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// (C) Copyright 2014, Google Inc.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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///////////////////////////////////////////////////////////////////////
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#ifndef TESSERACT_LSTM_MAXPOOL_H_
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#define TESSERACT_LSTM_MAXPOOL_H_
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#include "reconfig.h"
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namespace tesseract {
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// Maxpooling reduction. Independently for each input, selects the location
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// in the rectangle that contains the max value.
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// Backprop propagates only to the position that was the max.
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class Maxpool : public Reconfig {
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public:
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Maxpool(const STRING& name, int ni, int x_scale, int y_scale);
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virtual ~Maxpool();
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// Accessors.
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virtual STRING spec() const {
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STRING spec;
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spec.add_str_int("Mp", y_scale_);
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spec.add_str_int(",", x_scale_);
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return spec;
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}
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// Reads from the given file. Returns false in case of error.
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// If swap is true, assumes a big/little-endian swap is needed.
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virtual bool DeSerialize(bool swap, TFile* fp);
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// Runs forward propagation of activations on the input line.
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// See Network for a detailed discussion of the arguments.
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virtual void Forward(bool debug, const NetworkIO& input,
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const TransposedArray* input_transpose,
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NetworkScratch* scratch, NetworkIO* output);
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// Runs backward propagation of errors on the deltas line.
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// See Network for a detailed discussion of the arguments.
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virtual bool Backward(bool debug, const NetworkIO& fwd_deltas,
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NetworkScratch* scratch,
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NetworkIO* back_deltas);
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private:
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// Memory of which input was the max.
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GENERIC_2D_ARRAY<int> maxes_;
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};
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} // namespace tesseract.
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#endif // TESSERACT_LSTM_MAXPOOL_H_
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