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https://github.com/tesseract-ocr/tesseract.git
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92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
///////////////////////////////////////////////////////////////////////
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// File: reversed.cpp
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// Description: Runs a single network on time-reversed input, reversing output.
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// Author: Ray Smith
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// Created: Thu May 02 08:42:06 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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#include "reversed.h"
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#include <stdio.h>
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#include "networkscratch.h"
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namespace tesseract {
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Reversed::Reversed(const STRING& name, NetworkType type) : Plumbing(name) {
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type_ = type;
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}
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Reversed::~Reversed() {
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}
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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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StaticShape Reversed::OutputShape(const StaticShape& input_shape) const {
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if (type_ == NT_XYTRANSPOSE) {
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StaticShape x_shape(input_shape);
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x_shape.set_width(input_shape.height());
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x_shape.set_height(input_shape.width());
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x_shape = stack_[0]->OutputShape(x_shape);
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x_shape.SetShape(x_shape.batch(), x_shape.width(), x_shape.height(),
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x_shape.depth());
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return x_shape;
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}
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return stack_[0]->OutputShape(input_shape);
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}
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// Takes ownership of the given network to make it the reversed one.
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void Reversed::SetNetwork(Network* network) {
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stack_.clear();
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AddToStack(network);
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}
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// Runs forward propagation of activations on the input line.
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// See NetworkCpp for a detailed discussion of the arguments.
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void Reversed::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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NetworkScratch::IO rev_input(input, scratch);
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ReverseData(input, rev_input);
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NetworkScratch::IO rev_output(input, scratch);
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stack_[0]->Forward(debug, *rev_input, NULL, scratch, rev_output);
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ReverseData(*rev_output, output);
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}
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// Runs backward propagation of errors on the deltas line.
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// See NetworkCpp for a detailed discussion of the arguments.
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bool Reversed::Backward(bool debug, const NetworkIO& fwd_deltas,
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NetworkScratch* scratch,
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NetworkIO* back_deltas) {
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NetworkScratch::IO rev_input(fwd_deltas, scratch);
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ReverseData(fwd_deltas, rev_input);
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NetworkScratch::IO rev_output(fwd_deltas, scratch);
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if (stack_[0]->Backward(debug, *rev_input, scratch, rev_output)) {
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ReverseData(*rev_output, back_deltas);
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return true;
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}
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return false;
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}
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// Copies src to *dest with the reversal according to type_.
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void Reversed::ReverseData(const NetworkIO& src, NetworkIO* dest) const {
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if (type_ == NT_XREVERSED)
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dest->CopyWithXReversal(src);
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else if (type_ == NT_YREVERSED)
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dest->CopyWithYReversal(src);
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else
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dest->CopyWithXYTranspose(src);
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}
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} // namespace tesseract.
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