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// Copyright 2018 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 "sentencepiece_trainer.h"
#include <string>
#include <vector>
#include "builder.h"
#include "common.h"
#include "flags.h"
#include "normalizer.h"
#include "sentencepiece.pb.h"
#include "sentencepiece_model.pb.h"
#include "trainer_factory.h"
#include "util.h"
namespace sentencepiece {
namespace {
static constexpr char kDefaultNormalizerName[] = "nmt_nfkc";
} // namespace
// static
util::Status SentencePieceTrainer::Train(const TrainerSpec &trainer_spec) {
NormalizerSpec normalizer_spec;
return Train(trainer_spec, normalizer_spec);
}
// static
util::Status SentencePieceTrainer::Train(
const TrainerSpec &trainer_spec, const NormalizerSpec &normalizer_spec) {
auto copied_normalizer_spec = normalizer_spec;
RETURN_IF_ERROR(PopulateNormalizerSpec(&copied_normalizer_spec));
auto trainer = TrainerFactory::Create(trainer_spec, copied_normalizer_spec);
return trainer->Train();
}
// static
NormalizerSpec SentencePieceTrainer::GetNormalizerSpec(
util::min_string_view name) {
NormalizerSpec spec;
spec.set_name(name.data(), name.size());
CHECK_OK(normalizer::Builder::GetPrecompiledCharsMap(
spec.name(), spec.mutable_precompiled_charsmap()));
return spec;
}
// static
util::Status SentencePieceTrainer::SetProtoField(
util::min_string_view _field_name, util::min_string_view _value,
google::protobuf::Message *message) {
const absl::string_view field_name(_field_name.data(), _field_name.size());
const absl::string_view value(_value.data(), _value.size());
const auto *descriptor = message->GetDescriptor();
const auto *reflection = message->GetReflection();
CHECK_OR_RETURN(descriptor != nullptr && reflection != nullptr)
<< "reflection is not supported.";
const auto *field = descriptor->FindFieldByName(
std::string(field_name.data(), field_name.size()));
if (field == nullptr) {
return util::StatusBuilder(util::error::NOT_FOUND)
<< "unknown field name \"" << field_name << "\" in\n"
<< descriptor->DebugString();
}
std::vector<std::string> values = {std::string(value)};
if (field->is_repeated())
values = string_util::Split(std::string(value), ",");
#define SET_FIELD(METHOD_TYPE, v) \
if (field->is_repeated()) \
reflection->Add##METHOD_TYPE(message, field, v); \
else \
reflection->Set##METHOD_TYPE(message, field, v);
#define DEFINE_SET_FIELD(PROTO_TYPE, CPP_TYPE, FUNC_PREFIX, METHOD_TYPE, \
EMPTY) \
case google::protobuf::FieldDescriptor::CPPTYPE_##PROTO_TYPE: { \
CPP_TYPE v; \
if (!string_util::lexical_cast(value.empty() ? EMPTY : value, &v)) \
return util::StatusBuilder(util::error::INVALID_ARGUMENT) \
<< "cannot parse \"" << value << "\" as \"" << field->type_name() \
<< "\"."; \
SET_FIELD(METHOD_TYPE, v); \
break; \
}
for (const auto &value : values) {
switch (field->cpp_type()) {
DEFINE_SET_FIELD(INT32, int32, i, Int32, "");
DEFINE_SET_FIELD(INT64, int64, i, Int64, "");
DEFINE_SET_FIELD(UINT32, uint32, i, UInt32, "");
DEFINE_SET_FIELD(UINT64, uint64, i, UInt64, "");
DEFINE_SET_FIELD(DOUBLE, double, d, Double, "");
DEFINE_SET_FIELD(FLOAT, float, f, Float, "");
DEFINE_SET_FIELD(BOOL, bool, b, Bool, "true");
case google::protobuf::FieldDescriptor::CPPTYPE_STRING:
SET_FIELD(String, value);
break;
case google::protobuf::FieldDescriptor::CPPTYPE_ENUM: {
const auto *enum_value =
field->enum_type()->FindValueByName(string_util::ToUpper(value));
if (enum_value == nullptr)
return util::StatusBuilder(util::error::INVALID_ARGUMENT)
<< "unknown enumeration value of \"" << value
<< "\" for field \"" << field->name() << "\".";
SET_FIELD(Enum, enum_value);
break;
}
default:
return util::StatusBuilder(util::error::UNIMPLEMENTED)
<< "proto type \"" << field->cpp_type_name()
<< "\" is not supported.";
}
}
return util::OkStatus();
}
// static
util::Status SentencePieceTrainer::MergeSpecsFromArgs(
util::min_string_view _args, TrainerSpec *trainer_spec,
NormalizerSpec *normalizer_spec) {
CHECK_OR_RETURN(trainer_spec) << "`trainer_spec` must not be null.";
CHECK_OR_RETURN(normalizer_spec) << "`normalizer_spec` must not be null.";
absl::string_view args(_args.data(), _args.size());
if (args.empty()) return util::OkStatus();
for (auto arg : string_util::SplitPiece(args, " ")) {
string_util::ConsumePrefix(&arg, "--");
std::string key, value;
auto pos = arg.find("=");
if (pos == absl::string_view::npos) {
key = std::string(arg);
} else {
key = std::string(arg.substr(0, pos));
value = std::string(arg.substr(pos + 1));
}
// Exception.
if (key == "normalization_rule_name") {
normalizer_spec->set_name(value);
continue;
}
const auto status_train = SetProtoField(key, value, trainer_spec);
if (status_train.ok()) continue;
if (!util::IsNotFound(status_train)) return status_train;
const auto status_norm = SetProtoField(key, value, normalizer_spec);
if (status_norm.ok()) continue;
if (!util::IsNotFound(status_norm)) return status_norm;
// Not found both in trainer_spec and normalizer_spec.
if (util::IsNotFound(status_train) && util::IsNotFound(status_norm)) {
return status_train;
}
}
return util::OkStatus();
}
// static
util::Status SentencePieceTrainer::Train(util::min_string_view args) {
TrainerSpec trainer_spec;
NormalizerSpec normalizer_spec;
RETURN_IF_ERROR(MergeSpecsFromArgs(args, &trainer_spec, &normalizer_spec));
return Train(trainer_spec, normalizer_spec);
}
// static
util::Status SentencePieceTrainer::PopulateNormalizerSpec(
NormalizerSpec *normalizer_spec) {
CHECK_OR_RETURN(normalizer_spec);
if (!normalizer_spec->normalization_rule_tsv().empty()) {
CHECK_OR_RETURN(normalizer_spec->precompiled_charsmap().empty())
<< "precompiled_charsmap is already defined.";
normalizer::Builder::CharsMap chars_map;
RETURN_IF_ERROR(normalizer::Builder::LoadCharsMap(
normalizer_spec->normalization_rule_tsv(), &chars_map));
RETURN_IF_ERROR(normalizer::Builder::CompileCharsMap(
chars_map, normalizer_spec->mutable_precompiled_charsmap()));
normalizer_spec->set_name("user_defined");
} else {
if (normalizer_spec->name().empty()) {
normalizer_spec->set_name(kDefaultNormalizerName);
}
if (normalizer_spec->precompiled_charsmap().empty()) {
RETURN_IF_ERROR(normalizer::Builder::GetPrecompiledCharsMap(
normalizer_spec->name(),
normalizer_spec->mutable_precompiled_charsmap()));
}
}
return util::OkStatus();
}
} // namespace sentencepiece
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