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88 lines
3.3 KiB
C++
88 lines
3.3 KiB
C++
///////////////////////////////////////////////////////////////////////
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// File: parallel.h
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// Description: Runs networks in parallel on the same input.
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// Author: Ray Smith
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// Created: Thu May 02 08:02:06 PST 2013
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//
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// (C) Copyright 2013, 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_PARALLEL_H_
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#define TESSERACT_LSTM_PARALLEL_H_
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#include "plumbing.h"
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namespace tesseract {
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// Runs multiple networks in parallel, interlacing their outputs.
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class Parallel : public Plumbing {
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public:
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// ni_ and no_ will be set by AddToStack.
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Parallel(const STRING& name, NetworkType type);
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virtual ~Parallel();
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// Returns the shape output from the network given an input shape (which may
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// be partially unknown ie zero).
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virtual StaticShape OutputShape(const StaticShape& input_shape) const;
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virtual STRING spec() const {
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STRING spec;
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if (type_ == NT_PAR_2D_LSTM) {
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// We have 4 LSTMs operating in parallel here, so the size of each is
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// the number of outputs/4.
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spec.add_str_int("L2xy", no_ / 4);
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} else if (type_ == NT_PAR_RL_LSTM) {
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// We have 2 LSTMs operating in parallel here, so the size of each is
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// the number of outputs/2.
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if (stack_[0]->type() == NT_LSTM_SUMMARY)
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spec.add_str_int("Lbxs", no_ / 2);
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else
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spec.add_str_int("Lbx", no_ / 2);
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} else {
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if (type_ == NT_REPLICATED) {
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spec.add_str_int("R", stack_.size());
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spec += "(";
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spec += stack_[0]->spec();
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} else {
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spec = "(";
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for (int i = 0; i < stack_.size(); ++i) spec += stack_[i]->spec();
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}
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spec += ")";
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}
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return spec;
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}
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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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// If *this is a NT_REPLICATED, then it feeds a replicated network with
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// identical inputs, and it would be extremely wasteful for them to each
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// calculate and store the same transpose of the inputs, so Parallel does it
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// and passes a pointer to the replicated network, allowing it to use the
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// transpose on the next call to Backward.
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TransposedArray transposed_input_;
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};
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} // namespace tesseract.
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#endif // TESSERACT_LSTM_PARALLEL_H_
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