// 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 <string>
#include <vector>
#include "absl/container/flat_hash_map.h"
#include "absl/flags/flag.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_join.h"
#include "common.h"
#include "filesystem.h"
#include "init.h"
#include "sentencepiece.pb.h"
#include "sentencepiece_processor.h"
#include "trainer_interface.h"
ABSL_FLAG(std::string, model, "", "model file name");
ABSL_FLAG(
std::string,
output_format,
"piece",
"choose from piece, id, proto, nbest_piece, nbest_id, or nbest_proto");
ABSL_FLAG(std::string, input, "", "input filename");
ABSL_FLAG(std::string, output, "", "output filename");
ABSL_FLAG(std::string,
extra_options,
"",
"':' separated encoder extra options, e.g., \"reverse:bos:eos\"");
ABSL_FLAG(int32, nbest_size, 10, "NBest size");
ABSL_FLAG(double, alpha, 0.5, "Smoothing parameter for sampling mode.");
ABSL_FLAG(uint32,
random_seed,
static_cast<uint32>(-1),
"Seed value for random generator.");
// Piece restriction with vocabulary file.
// https://github.com/rsennrich/subword-nmt#best-practice-advice-for-byte-pair-encoding-in-nmt
ABSL_FLAG(std::string,
vocabulary,
"",
"Restrict the vocabulary. The encoder only emits the "
"tokens in \"vocabulary\" file");
ABSL_FLAG(int32,
vocabulary_threshold,
0,
"Words with frequency < threshold will be treated as OOV");
ABSL_FLAG(bool,
generate_vocabulary,
false,
"Generates vocabulary file instead of segmentation");
int main(int argc, char *argv[]) {
sentencepiece::ScopedResourceDestructor cleaner;
sentencepiece::ParseCommandLineFlags(argv[0], &argc, &argv, true);
std::vector<std::string> rest_args;
if (absl::GetFlag(FLAGS_input).empty()) {
for (int i = 1; i < argc; ++i) {
rest_args.push_back(std::string(argv[i]));
}
} else {
rest_args.push_back(absl::GetFlag(FLAGS_input));
}
if (absl::GetFlag(FLAGS_random_seed) != -1) {
sentencepiece::SetRandomGeneratorSeed(absl::GetFlag(FLAGS_random_seed));
}
if (rest_args.empty()) {
rest_args.push_back(""); // empty means that reading from stdin.
}
CHECK(!absl::GetFlag(FLAGS_model).empty());
sentencepiece::SentencePieceProcessor sp;
CHECK_OK(sp.Load(absl::GetFlag(FLAGS_model)));
CHECK_OK(sp.SetEncodeExtraOptions(absl::GetFlag(FLAGS_extra_options)));
if (!absl::GetFlag(FLAGS_vocabulary).empty()) {
CHECK_OK(sp.LoadVocabulary(absl::GetFlag(FLAGS_vocabulary),
absl::GetFlag(FLAGS_vocabulary_threshold)));
}
auto output =
sentencepiece::filesystem::NewWritableFile(absl::GetFlag(FLAGS_output));
CHECK_OK(output->status());
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;
absl::flat_hash_map<std::string, int> vocab;
sentencepiece::SentencePieceText spt;
sentencepiece::NBestSentencePieceText nbest_spt;
std::function<void(absl::string_view line)> process;
const int nbest_size = absl::GetFlag(FLAGS_nbest_size);
const float alpha = absl::GetFlag(FLAGS_alpha);
if (absl::GetFlag(FLAGS_generate_vocabulary)) {
process = [&](absl::string_view 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 (absl::GetFlag(FLAGS_output_format) == "piece") {
process = [&](absl::string_view line) {
CHECK_OK(sp.Encode(line, &sps));
output->WriteLine(absl::StrJoin(sps, " "));
};
} else if (absl::GetFlag(FLAGS_output_format) == "id") {
process = [&](absl::string_view line) {
CHECK_OK(sp.Encode(line, &ids));
output->WriteLine(absl::StrJoin(ids, " "));
};
} else if (absl::GetFlag(FLAGS_output_format) == "proto") {
process = [&](absl::string_view line) { CHECK_OK(sp.Encode(line, &spt)); };
} else if (absl::GetFlag(FLAGS_output_format) == "sample_piece") {
process = [&](absl::string_view line) {
CHECK_OK(sp.SampleEncode(line, nbest_size, alpha, &sps));
output->WriteLine(absl::StrJoin(sps, " "));
};
} else if (absl::GetFlag(FLAGS_output_format) == "sample_id") {
process = [&](absl::string_view line) {
CHECK_OK(sp.SampleEncode(line, nbest_size, alpha, &ids));
output->WriteLine(absl::StrJoin(ids, " "));
};
} else if (absl::GetFlag(FLAGS_output_format) == "sample_proto") {
process = [&](absl::string_view line) {
CHECK_OK(sp.SampleEncode(line, nbest_size, alpha, &spt));
};
} else if (absl::GetFlag(FLAGS_output_format) == "nbest_piece") {
process = [&](absl::string_view line) {
CHECK_OK(sp.NBestEncode(line, nbest_size, &nbest_sps));
for (const auto &result : nbest_sps) {
output->WriteLine(absl::StrJoin(result, " "));
}
};
} else if (absl::GetFlag(FLAGS_output_format) == "nbest_id") {
process = [&](absl::string_view line) {
CHECK_OK(sp.NBestEncode(line, nbest_size, &nbest_ids));
for (const auto &result : nbest_ids) {
output->WriteLine(absl::StrJoin(result, " "));
}
};
} else if (absl::GetFlag(FLAGS_output_format) == "nbest_proto") {
process = [&](absl::string_view line) {
CHECK_OK(sp.NBestEncode(line, nbest_size, &nbest_spt));
};
} else {
LOG(FATAL) << "Unknown output format: "
<< absl::GetFlag(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 (absl::GetFlag(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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