mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-28 05:39:35 +08:00
90 lines
3.5 KiB
C++
90 lines
3.5 KiB
C++
///////////////////////////////////////////////////////////////////////
|
|
// File: reversed.h
|
|
// Description: Runs a single network on time-reversed input, reversing output.
|
|
// Author: Ray Smith
|
|
// Created: Thu May 02 08:38:06 PST 2013
|
|
//
|
|
// (C) Copyright 2013, Google Inc.
|
|
// 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.
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef TESSERACT_LSTM_REVERSED_H_
|
|
#define TESSERACT_LSTM_REVERSED_H_
|
|
|
|
#include "matrix.h"
|
|
#include "plumbing.h"
|
|
|
|
namespace tesseract {
|
|
|
|
// C++ Implementation of the Reversed class from lstm.py.
|
|
class Reversed : public Plumbing {
|
|
public:
|
|
explicit Reversed(const STRING& name, NetworkType type);
|
|
virtual ~Reversed();
|
|
|
|
// Returns the shape output from the network given an input shape (which may
|
|
// be partially unknown ie zero).
|
|
virtual StaticShape OutputShape(const StaticShape& input_shape) const;
|
|
|
|
virtual STRING spec() const {
|
|
STRING spec(type_ == NT_XREVERSED ? "Rx"
|
|
: (type_ == NT_YREVERSED ? "Ry" : "Txy"));
|
|
// For most simple cases, we will output Rx<net> or Ry<net> where <net> is
|
|
// the network in stack_[0], but in the special case that <net> is an
|
|
// LSTM, we will just output the LSTM's spec modified to take the reversal
|
|
// into account. This is because when the user specified Lfy64, we actually
|
|
// generated TxyLfx64, and if the user specified Lrx64 we actually
|
|
// generated RxLfx64, and we want to display what the user asked for.
|
|
STRING net_spec = stack_[0]->spec();
|
|
if (net_spec[0] == 'L') {
|
|
// Setup a from and to character according to the type of the reversal
|
|
// such that the LSTM spec gets modified to the spec that the user
|
|
// asked for
|
|
char from = 'f';
|
|
char to = 'r';
|
|
if (type_ == NT_XYTRANSPOSE) {
|
|
from = 'x';
|
|
to = 'y';
|
|
}
|
|
// Change the from char to the to char.
|
|
for (int i = 0; i < net_spec.length(); ++i) {
|
|
if (net_spec[i] == from) net_spec[i] = to;
|
|
}
|
|
return net_spec;
|
|
}
|
|
spec += net_spec;
|
|
return spec;
|
|
}
|
|
|
|
// Takes ownership of the given network to make it the reversed one.
|
|
void SetNetwork(Network* network);
|
|
|
|
// Runs forward propagation of activations on the input line.
|
|
// See Network for a detailed discussion of the arguments.
|
|
virtual void Forward(bool debug, const NetworkIO& input,
|
|
const TransposedArray* input_transpose,
|
|
NetworkScratch* scratch, NetworkIO* output);
|
|
|
|
// Runs backward propagation of errors on the deltas line.
|
|
// See Network for a detailed discussion of the arguments.
|
|
virtual bool Backward(bool debug, const NetworkIO& fwd_deltas,
|
|
NetworkScratch* scratch,
|
|
NetworkIO* back_deltas);
|
|
|
|
private:
|
|
// Copies src to *dest with the reversal according to type_.
|
|
void ReverseData(const NetworkIO& src, NetworkIO* dest) const;
|
|
};
|
|
|
|
} // namespace tesseract.
|
|
|
|
#endif // TESSERACT_LSTM_REVERSED_H_
|