from huggingface_hub import try_to_load_from_cache, _CACHED_NO_EXIST

filepath = try_to_load_from_cache()
if isinstance(filepath, str):
    # file exists and is cached
    ...
elif filepath is _CACHED_NO_EXIST:
    # non-existence of file is cached
    ...
else:
    # file is not cached
    ...

    assets/
    └── datasets/
    │   ├── SQuAD/
    │   │   ├── downloaded/
    │   │   ├── extracted/
    │   │   └── processed/
    │   ├── Helsinki-NLP--tatoeba_mt/
    │       ├── downloaded/
    │       ├── extracted/
    │       └── processed/
    └── transformers/
        ├── default/
        │   ├── something/
        ├── bert-base-cased/
        │   ├── default/
        │   └── training/
    hub/
    └── models--julien-c--EsperBERTo-small/
        ├── blobs/
        │   ├── (...)
        │   ├── (...)
        ├── refs/
        │   └── (...)
        └── [ 128]  snapshots/
            ├── 2439f60ef33a0d46d85da5001d52aeda5b00ce9f/
            │   ├── (...)
            └── bbc77c8132af1cc5cf678da3f1ddf2de43606d48/
                └── (...)

>>> from huggingface_hub import cached_assets_path

>>> cached_assets_path(library_name="datasets", namespace="SQuAD", subfolder="download")
PosixPath('/home/wauplin/.cache/huggingface/extra/datasets/SQuAD/download')

>>> cached_assets_path(library_name="datasets", namespace="SQuAD", subfolder="extracted")
PosixPath('/home/wauplin/.cache/huggingface/extra/datasets/SQuAD/extracted')

>>> cached_assets_path(library_name="datasets", namespace="Helsinki-NLP/tatoeba_mt")
PosixPath('/home/wauplin/.cache/huggingface/extra/datasets/Helsinki-NLP--tatoeba_mt/default')

>>> cached_assets_path(library_name="datasets", assets_dir="/tmp/tmp123456")
PosixPath('/tmp/tmp123456/datasets/default/default')

>>> from huggingface_hub import scan_cache_dir

>>> hf_cache_info = scan_cache_dir()
HFCacheInfo(
    size_on_disk=3398085269,
    repos=frozenset({
        CachedRepoInfo(
            repo_id='t5-small',
            repo_type='model',
            repo_path=PosixPath(...),
            size_on_disk=970726914,
            nb_files=11,
            revisions=frozenset({
                CachedRevisionInfo(
                    commit_hash='d78aea13fa7ecd06c29e3e46195d6341255065d5',
                    size_on_disk=970726339,
                    snapshot_path=PosixPath(...),
                    files=frozenset({
                        CachedFileInfo(
                            file_name='config.json',
                            size_on_disk=1197
                            file_path=PosixPath(...),
                            blob_path=PosixPath(...),
                        ),
                        CachedFileInfo(...),
                        ...
                    }),
                ),
                CachedRevisionInfo(...),
                ...
            }),
        ),
        CachedRepoInfo(...),
        ...
    }),
    warnings=[
        CorruptedCacheException("Snapshots dir doesn't exist in cached repo: ..."),
        CorruptedCacheException(...),
        ...
    ],
)

> hf cache ls
ID                          SIZE     LAST_ACCESSED LAST_MODIFIED REFS
--------------------------- -------- ------------- ------------- -----------
dataset/nyu-mll/glue          157.4M 2 days ago    2 days ago    main script
model/LiquidAI/LFM2-VL-1.6B     3.2G 4 days ago    4 days ago    main
model/microsoft/UserLM-8b      32.1G 4 days ago    4 days ago    main

Done in 0.0s. Scanned 6 repo(s) for a total of 3.4G.
Got 1 warning(s) while scanning. Use -vvv to print details.