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///////////////////////////////////////////////////////////////////////
// File: reconfig.h
// Description: Network layer that reconfigures the scaling vs feature
// depth.
// Author: Ray Smith
//
// (C) Copyright 2014, 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_RECONFIG_H_
#define TESSERACT_LSTM_RECONFIG_H_
#include "matrix.h"
#include "network.h"
namespace tesseract {
// Reconfigures (Shrinks) the inputs by concatenating an x_scale by y_scale tile
// of inputs together, producing a single, deeper output per tile.
// Note that fractional parts are truncated for efficiency, so make sure the
// input stride is a multiple of the y_scale factor!
class Reconfig : public Network {
public:
TESS_API
Reconfig(const char* name, int ni, int x_scale, int y_scale);
~Reconfig() override = default;
// Returns the shape output from the network given an input shape (which may
// be partially unknown ie zero).
StaticShape OutputShape(const StaticShape& input_shape) const override;
STRING spec() const override {
STRING spec;
spec.add_str_int("S", y_scale_);
spec.add_str_int(",", x_scale_);
return spec;
}
// Returns an integer reduction factor that the network applies to the
// time sequence. Assumes that any 2-d is already eliminated. Used for
// scaling bounding boxes of truth data.
// WARNING: if GlobalMinimax is used to vary the scale, this will return
// the last used scale factor. Call it before any forward, and it will return
// the minimum scale factor of the paths through the GlobalMinimax.
int XScaleFactor() const override;
// Writes to the given file. Returns false in case of error.
bool Serialize(TFile* fp) const override;
// Reads from the given file. Returns false in case of error.
bool DeSerialize(TFile* fp) override;
// Runs forward propagation of activations on the input line.
// See Network for a detailed discussion of the arguments.
void Forward(bool debug, const NetworkIO& input,
const TransposedArray* input_transpose,
NetworkScratch* scratch, NetworkIO* output) override;
// Runs backward propagation of errors on the deltas line.
// See Network for a detailed discussion of the arguments.
bool Backward(bool debug, const NetworkIO& fwd_deltas,
NetworkScratch* scratch,
NetworkIO* back_deltas) override;
private:
void DebugWeights() override {
tprintf("Must override Network::DebugWeights for type %d\n", type_);
}
protected:
// Non-serialized data used to store parameters between forward and back.
StrideMap back_map_;
// Serialized data.
int32_t x_scale_;
int32_t y_scale_;
};
} // namespace tesseract.
#endif // TESSERACT_LSTM_SUBSAMPLE_H_
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