tesseract/training/lstmtester.h

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///////////////////////////////////////////////////////////////////////
// File: lstmtester.h
// Description: Top-level line evaluation class for LSTM-based networks.
// Author: Ray Smith
// Created: Wed Nov 23 11:05:06 PST 2016
//
// (C) Copyright 2016, 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_TRAINING_LSTMTESTER_H_
#define TESSERACT_TRAINING_LSTMTESTER_H_
#include "genericvector.h"
#include "lstmtrainer.h"
#include "strngs.h"
#include "svutil.h"
namespace tesseract {
class LSTMTester {
public:
LSTMTester(inT64 max_memory);
// Loads a set of lstmf files that were created using the lstm.train config to
// tesseract into memory ready for testing. Returns false if nothing was
// loaded. The arg is a filename of a file that lists the filenames, with one
// name per line. Conveniently, tesstrain.sh generates such a file, along
// with the files themselves.
bool LoadAllEvalData(const STRING& filenames_file);
// Loads a set of lstmf files that were created using the lstm.train config to
// tesseract into memory ready for testing. Returns false if nothing was
// loaded.
bool LoadAllEvalData(const GenericVector<STRING>& filenames);
// Runs an evaluation asynchronously on the stored eval data and returns a
// string describing the results of the previous test. Args match TestCallback
// declared in lstmtrainer.h:
// iteration: Current learning iteration number.
// training_errors: If not null, is an array of size ET_COUNT, indexed by
// the ErrorTypes enum and indicates the current errors measured by the
// trainer, and this is a serious request to run an evaluation. If null,
// then the caller is just polling for the results of the previous eval.
// model_data: is the model to evaluate, which should be a serialized
// LSTMTrainer.
// training_stage: an arbitrary number on the progress of training.
STRING RunEvalAsync(int iteration, const double* training_errors,
const TessdataManager& model_mgr, int training_stage);
// Runs an evaluation synchronously on the stored eval data and returns a
// string describing the results. Args as RunEvalAsync, except verbosity,
// which outputs errors, if 1, or all results if 2.
STRING RunEvalSync(int iteration, const double* training_errors,
const TessdataManager& model_mgr, int training_stage,
int verbosity);
private:
// Static helper thread function for RunEvalAsync, with a specific signature
// required by SVSync::StartThread. Actually a member function pretending to
// be static, its arg is a this pointer that it will cast back to LSTMTester*
// to call RunEvalSync using the stored args that RunEvalAsync saves in *this.
// LockIfNotRunning must have returned true before calling ThreadFunc, and
// it will call UnlockRunning to release the lock after RunEvalSync completes.
static void* ThreadFunc(void* lstmtester_void);
// Returns true if there is currently nothing running, and takes the lock
// if there is nothing running.
bool LockIfNotRunning();
// Releases the running lock.
void UnlockRunning();
// The data to test with.
DocumentCache test_data_;
int total_pages_;
// Flag that indicates an asynchronous test is currently running.
// Protected by running_mutex_.
bool async_running_;
SVMutex running_mutex_;
// Stored copies of the args for use while running asynchronously.
int test_iteration_;
const double* test_training_errors_;
TessdataManager test_model_mgr_;
int test_training_stage_;
STRING test_result_;
};
} // namespace tesseract
#endif // TESSERACT_TRAINING_LSTMTESTER_H_