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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 <functional>
#include <unordered_map>
#include "common.h"
#include "filesystem.h"
#include "flags.h"
#include "sentencepiece.pb.h"
#include "sentencepiece_processor.h"
#include "trainer_interface.h"
DEFINE_string(model, "", "model file name");
DEFINE_string(
output_format, "piece",
"choose from piece, id, proto, nbest_piece, nbest_id, or nbest_proto");
DEFINE_string(output, "", "output filename");
DEFINE_string(extra_options, "",
"':' separated encoder extra options, e.g., \"reverse:bos:eos\"");
DEFINE_int32(nbest_size, 10, "NBest size");
DEFINE_double(alpha, 0.5, "Smoothing parameter for sampling mode.");
// Piece restriction with vocabulary file.
// https://github.com/rsennrich/subword-nmt#best-practice-advice-for-byte-pair-encoding-in-nmt
DEFINE_string(vocabulary, "",
"Restrict the vocabulary. The encoder only emits the "
"tokens in \"vocabulary\" file");
DEFINE_int32(vocabulary_threshold, 0,
"Words with frequency < threshold will be treated as OOV");
DEFINE_bool(generate_vocabulary, false,
"Generates vocabulary file instead of segmentation");
int main(int argc, char *argv[]) {
std::vector<std::string> rest_args;
sentencepiece::flags::ParseCommandLineFlags(argc, argv, &rest_args);
CHECK_OR_HELP(model);
sentencepiece::SentencePieceProcessor sp;
CHECK_OK(sp.Load(FLAGS_model));
CHECK_OK(sp.SetEncodeExtraOptions(FLAGS_extra_options));
if (!FLAGS_vocabulary.empty()) {
CHECK_OK(sp.LoadVocabulary(FLAGS_vocabulary, FLAGS_vocabulary_threshold));
}
auto output = sentencepiece::filesystem::NewWritableFile(FLAGS_output);
CHECK_OK(output->status());
if (rest_args.empty()) {
rest_args.push_back(""); // empty means that reading from stdin.
}
std::string line;
std::vector<std::string> sps;
std::vector<int> ids;
std::vector<std::vector<std::string>> nbest_sps;
std::vector<std::vector<int>> nbest_ids;
std::unordered_map<std::string, int> vocab;
sentencepiece::SentencePieceText spt;
sentencepiece::NBestSentencePieceText nbest_spt;
std::function<void(const std::string &line)> process;
if (FLAGS_generate_vocabulary) {
process = [&](const std::string &line) {
CHECK_OK(sp.Encode(line, &spt));
for (const auto &piece : spt.pieces()) {
if (!sp.IsUnknown(piece.id()) && !sp.IsControl(piece.id()))
vocab[piece.piece()]++;
}
};
} else if (FLAGS_output_format == "piece") {
process = [&](const std::string &line) {
CHECK_OK(sp.Encode(line, &sps));
output->WriteLine(sentencepiece::string_util::Join(sps, " "));
};
} else if (FLAGS_output_format == "id") {
process = [&](const std::string &line) {
CHECK_OK(sp.Encode(line, &ids));
output->WriteLine(sentencepiece::string_util::Join(ids, " "));
};
} else if (FLAGS_output_format == "proto") {
process = [&](const std::string &line) {
CHECK_OK(sp.Encode(line, &spt));
output->WriteLine(spt.Utf8DebugString());
};
} else if (FLAGS_output_format == "sample_piece") {
process = [&](const std::string &line) {
CHECK_OK(sp.SampleEncode(line, FLAGS_nbest_size, FLAGS_alpha, &sps));
output->WriteLine(sentencepiece::string_util::Join(sps, " "));
};
} else if (FLAGS_output_format == "sample_id") {
process = [&](const std::string &line) {
CHECK_OK(sp.SampleEncode(line, FLAGS_nbest_size, FLAGS_alpha, &ids));
output->WriteLine(sentencepiece::string_util::Join(ids, " "));
};
} else if (FLAGS_output_format == "sample_proto") {
process = [&](const std::string &line) {
CHECK_OK(sp.SampleEncode(line, FLAGS_nbest_size, FLAGS_alpha, &spt));
output->WriteLine(spt.Utf8DebugString());
};
} else if (FLAGS_output_format == "nbest_piece") {
process = [&](const std::string &line) {
CHECK_OK(sp.NBestEncode(line, FLAGS_nbest_size, &nbest_sps));
for (const auto &result : nbest_sps) {
output->WriteLine(sentencepiece::string_util::Join(result, " "));
}
};
} else if (FLAGS_output_format == "nbest_id") {
process = [&](const std::string &line) {
CHECK_OK(sp.NBestEncode(line, FLAGS_nbest_size, &nbest_ids));
for (const auto &result : nbest_ids) {
output->WriteLine(sentencepiece::string_util::Join(result, " "));
}
};
} else if (FLAGS_output_format == "nbest_proto") {
process = [&](const std::string &line) {
CHECK_OK(sp.NBestEncode(line, FLAGS_nbest_size, &nbest_spt));
output->WriteLine(nbest_spt.Utf8DebugString());
};
} else {
LOG(FATAL) << "Unknown output format: " << FLAGS_output_format;
}
for (const auto &filename : rest_args) {
auto input = sentencepiece::filesystem::NewReadableFile(filename);
CHECK_OK(input->status());
while (input->ReadLine(&line)) {
process(line);
}
}
if (FLAGS_generate_vocabulary) {
for (const auto &it : sentencepiece::Sorted(vocab)) {
output->WriteLine(it.first + "\t" +
sentencepiece::string_util::SimpleItoa(it.second));
}
}
return 0;
}
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