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//
// 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 THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_SENTENCEPIECE_TOKENIZER_H_
#define THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_SENTENCEPIECE_TOKENIZER_H_
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/status/statusor.h" // from @com_google_absl
#include "absl/strings/string_view.h" // from @com_google_absl
#include "runtime/components/tokenizer.h"
#include "sentencepiece_model.pb.h" // from @sentencepiece
#include "sentencepiece_processor.h" // from @sentencepiece
namespace litert::lm {
// A Tokenizer implementation using SentencePiece.
class SentencePieceTokenizer : public Tokenizer {
public:
// Creates a SentencePieceTokenizer from the given model path.
// Note that the model path can only be a local file path but not a CNS path.
static absl::StatusOr<std::unique_ptr<SentencePieceTokenizer>> CreateFromFile(
absl::string_view model_path);
// Creates a SentencePieceTokenizer from a preloaded model buffer.
static absl::StatusOr<std::unique_ptr<SentencePieceTokenizer>>
CreateFromBuffer(absl::string_view model_buffer);
// Creates a SentencePieceTokenizer from a model proto.
static absl::StatusOr<std::unique_ptr<SentencePieceTokenizer>>
CreateFromProto(std::unique_ptr<sentencepiece::ModelProto> model_proto);
TokenizerType GetTokenizerType() const override {
return TokenizerType::kSentencePiece;
}
// Encodes the given text into a sequence of token ids.
absl::StatusOr<std::vector<int>> TextToTokenIds(
absl::string_view text) override;
// Converts a token string to its token id. Uses SentencePiece's
// PieceToId method.
absl::StatusOr<int> TokenToId(absl::string_view token) override;
// Decodes the given sequence of token ids into a string.
absl::StatusOr<std::string> TokenIdsToText(
const std::vector<int>& token_ids) override;
// Returns the tokens in the SentencePiece model.
std::vector<std::string> GetTokens() const override;
const sentencepiece::SentencePieceProcessor& GetProcessor() const {
return *processor_;
}
private:
// Constructor.
explicit SentencePieceTokenizer(
std::unique_ptr<sentencepiece::SentencePieceProcessor> processor)
: processor_(std::move(processor)),
vocab_size_(processor_->GetPieceSize()) {};
// SentencePiece processor.
std::unique_ptr<sentencepiece::SentencePieceProcessor> processor_;
// The size of the vocabulary. Used to avoid decoding the invalid IDs that are
// out of the range of the vocabulary.
int vocab_size_;
};
} // namespace litert::lm
#endif // THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_SENTENCEPIECE_TOKENIZER_H_
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