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5f923cd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | // Copyright 2025 The ODML Authors.
//
// 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 "runtime/components/huggingface_tokenizer.h"
#include <cstring>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/debugging/leak_check.h" // from @com_google_absl
#include "absl/memory/memory.h" // from @com_google_absl
#include "absl/status/status.h" // from @com_google_absl
#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 "runtime/util/memory_mapped_file.h"
#include "runtime/util/status_macros.h" // NOLINT
#include "include/tokenizers_cpp.h" // from @tokenizers_cpp
namespace litert::lm {
absl::StatusOr<std::unique_ptr<HuggingFaceTokenizer>>
HuggingFaceTokenizer::CreateFromFile(absl::string_view json_path) {
ASSIGN_OR_RETURN(auto memory_mapped_file, // NOLINT
MemoryMappedFile::Create(json_path));
std::string json_data(memory_mapped_file->length(), '\0');
memcpy(json_data.data(), memory_mapped_file->data(),
memory_mapped_file->length());
return CreateFromJson(json_data);
}
absl::StatusOr<std::unique_ptr<HuggingFaceTokenizer>>
HuggingFaceTokenizer::CreateFromJson(const std::string& json) {
auto tokenizer = tokenizers::Tokenizer::FromBlobJSON(json);
if (!tokenizer) {
return absl::InvalidArgumentError("Failed to create tokenizer from JSON.");
}
return absl::WrapUnique(new HuggingFaceTokenizer(std::move(tokenizer)));
}
// Encodes the given text into a TensorBuffer of token ids.
absl::StatusOr<std::vector<int>> HuggingFaceTokenizer::TextToTokenIds(
absl::string_view text) {
{
// Disable leak check as Google's default leak checker does not properly
// support Rust's lazy_static initialization.
// TODO(b/379364190) - Remove this once the leak checker is fixed.
absl::LeakCheckDisabler disabler;
return tokenizer_->Encode(std::string{text});
}
}
absl::StatusOr<int> HuggingFaceTokenizer::TokenToId(absl::string_view token) {
return tokenizer_->TokenToId(std::string{token});
}
// Decodes the given TensorBuffer of token ids into a vector of strings.
absl::StatusOr<std::string> HuggingFaceTokenizer::TokenIdsToText(
const std::vector<int>& token_ids) {
{
absl::LeakCheckDisabler disabler;
// Disable leak check as Google's default leak checker does not properly
// support Rust's lazy_static initialization.
// TODO(b/379364190) - Remove this once the leak checker is fixed.
std::string decoded = tokenizer_->Decode(token_ids);
if (Tokenizer::HasBpeSuffix(decoded)) {
return absl::DataLossError(
"The set of token IDs passed to the tokenizer is part of a BPE "
"sequence and needs more tokens to be decoded.");
} else {
return decoded;
}
}
}
std::vector<std::string> HuggingFaceTokenizer::GetTokens() const {
std::vector<std::string> tokens;
int vocab_size = tokenizer_->GetVocabSize();
tokens.reserve(vocab_size);
for (int i = 0; i < vocab_size; ++i) {
std::string token = tokenizer_->IdToToken(i);
tokens.push_back(token);
}
return tokens;
}
} // namespace litert::lm
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