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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_HUGGING_FACE_TOKENIZER_H_
#define THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_HUGGING_FACE_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 "include/tokenizers_cpp.h" // from @tokenizers_cpp
namespace litert::lm {
// A Tokenizer implementation using HuggingFace.
class HuggingFaceTokenizer : public Tokenizer {
public:
// Creates a HuggingFaceTokenizer from the JSON file
static absl::StatusOr<std::unique_ptr<HuggingFaceTokenizer>> CreateFromFile(
absl::string_view json_path);
// Creates a HuggingFaceTokenizer from a JSON string.
static absl::StatusOr<std::unique_ptr<HuggingFaceTokenizer>> CreateFromJson(
const std::string& json);
TokenizerType GetTokenizerType() const override {
return TokenizerType::kHuggingFace;
}
// Encodes the given text into a sequence of token ids.
absl::StatusOr<std::vector<int>> TextToTokenIds(
absl::string_view text) override;
absl::StatusOr<int> TokenToId(absl::string_view token) override;
// Decodes the given sequence of token ids into a string.
// Returns absl::DataLossError if any of the tokens are part of an incomplete
// BPE sequence.
absl::StatusOr<std::string> TokenIdsToText(
const std::vector<int>& token_ids) override;
std::vector<std::string> GetTokens() const override;
private:
// Constructor.
explicit HuggingFaceTokenizer(
std::unique_ptr<tokenizers::Tokenizer> tokenizer)
: tokenizer_(std::move(tokenizer)) {};
// HuggingFace processor.
std::unique_ptr<tokenizers::Tokenizer> tokenizer_;
};
} // namespace litert::lm
#endif // THIRD_PARTY_ODML_LITERT_LM_RUNTIME_COMPONENTS_HUGGING_FACE_TOKENIZER_H_
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