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// 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.!
#include "char_model_trainer.h"
#include <cmath>
#include "char_model.h"
#include "util.h"
namespace sentencepiece {
namespace character {
util::Status Trainer::Train() {
RETURN_IF_ERROR(status());
LOG(INFO) << "Starts training with : \n" << trainer_spec_.Utf8DebugString();
CHECK_OR_RETURN(normalizer_spec_.escape_whitespaces());
CHECK_EQ_OR_RETURN(TrainerSpec::CHAR, trainer_spec_.model_type());
RETURN_IF_ERROR(LoadSentences());
const int vocab_size = trainer_spec_.vocab_size() - meta_pieces_.size();
CHECK_GE_OR_RETURN(vocab_size, 0);
uint64 sum = 0;
for (const auto &it : required_chars_) {
sum += it.second;
}
const float logsum = log(sum);
CHECK_OR_RETURN(final_pieces_.empty());
for (const auto &it : Sorted(required_chars_)) {
if (final_pieces_.size() == static_cast<size_t>(vocab_size)) {
break;
}
final_pieces_.emplace_back(string_util::UnicodeCharToUTF8(it.first),
log(it.second) - logsum);
}
return Save();
}
} // namespace character
} // namespace sentencepiece
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