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2f86d9b | 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 | # Copyright 2026 DeepMind Technologies Limited.
#
# 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.
"""Utility for caching file on file system."""
import os
from etils import epath
# If defined the tokenizer model will be fetched from this local directory
# instead of being downloaded.
_GEMMA_CACHE_DIR_ENV_NAME = 'GEMMA_CACHE_DIR'
_DEFAULT_CACHE_DIR = '~/.gemma'
def maybe_get_from_cache(
*,
remote_file_path: epath.PathLike,
cache_subdir: str,
) -> epath.Path:
"""Returns the cached file if exists, otherwise returns the remote file path."""
filename = epath.Path(remote_file_path).name
cache_filepath = _get_cache_dir() / cache_subdir / filename
if cache_filepath.exists():
return cache_filepath
return epath.Path(remote_file_path)
def _get_cache_dir() -> epath.Path:
"""Get the path to the cached file."""
cache_dir = os.environ.get(_GEMMA_CACHE_DIR_ENV_NAME, _DEFAULT_CACHE_DIR)
return epath.Path(cache_dir).expanduser()
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