#
Utilities

##
Configure logging

The `huggingface_hub` package exposes a `logging` utility to control the logging level of the package itself. You can import it as such:

    from huggingface_hub import logging

Then, you may define the verbosity in order to update the amount of logs you’ll see:

    from huggingface_hub import logging

    logging.set_verbosity_error()
    logging.set_verbosity_warning()
    logging.set_verbosity_info()
    logging.set_verbosity_debug()

    logging.set_verbosity(...)

The levels should be understood as follows:

- `error`: only show critical logs about usage which may result in an error or unexpected behavior.
- `warning`: show logs that aren’t critical but usage may result in unintended behavior. Additionally, important informative logs may be shown.
- `info`: show most logs, including some verbose logging regarding what is happening under the hood. If something is behaving in an unexpected manner, we recommend switching the verbosity level to this in order to get more information.
- `debug`: show all logs, including some internal logs which may be used to track exactly what’s happening under the hood.

####
huggingface_hub.utils.logging.get_verbosity

< source >

( )

Return the current level for the HuggingFace Hub’s root logger.

HuggingFace Hub has following logging levels:

- `huggingface_hub.logging.CRITICAL`, `huggingface_hub.logging.FATAL`
- `huggingface_hub.logging.ERROR`
- `huggingface_hub.logging.WARNING`, `huggingface_hub.logging.WARN`
- `huggingface_hub.logging.INFO`
- `huggingface_hub.logging.DEBUG`

####
huggingface_hub.utils.logging.set_verbosity

< source >

( verbosity: int )

Parameters

- verbosity (`int`) — Logging level, e.g., `huggingface_hub.logging.DEBUG` and `huggingface_hub.logging.INFO`.

Sets the level for the HuggingFace Hub’s root logger.

####
huggingface_hub.utils.logging.set_verbosity_info

< source >

( )

Sets the verbosity to `logging.INFO`.

####
huggingface_hub.utils.logging.set_verbosity_debug

< source >

( )

Sets the verbosity to `logging.DEBUG`.

####
huggingface_hub.utils.logging.set_verbosity_warning

< source >

( )

Sets the verbosity to `logging.WARNING`.

####
huggingface_hub.utils.logging.set_verbosity_error

< source >

( )

Sets the verbosity to `logging.ERROR`.

####
huggingface_hub.utils.logging.disable_propagation

< source >

( )

Disable propagation of the library log outputs. Note that log propagation is disabled by default.

####
huggingface_hub.utils.logging.enable_propagation

< source >

( )

Enable propagation of the library log outputs. Please disable the HuggingFace Hub’s default handler to prevent double logging if the root logger has been configured.

###
Repo-specific helper methods

The methods exposed below are relevant when modifying modules from the `huggingface_hub` library itself. Using these shouldn’t be necessary if you use `huggingface_hub` and you don’t modify them.

####
huggingface_hub.utils.logging.get_logger

< source >

( name: Optional = None )

Parameters

- name (`str`, optional) — The name of the logger to get, usually the filename

Returns a logger with the specified name. This function is not supposed to be directly accessed by library users.

Example:

    >>> from huggingface_hub import get_logger

    >>> logger = get_logger(__file__)
    >>> logger.set_verbosity_info()

##
Configure progress bars

Progress bars are a useful tool to display information to the user while a long-running task is being executed (e.g. when downloading or uploading files). `huggingface_hub` exposes a `tqdm` wrapper to display progress bars in a consistent way across the library.

By default, progress bars are enabled. You can disable them globally by setting `HF_HUB_DISABLE_PROGRESS_BARS` environment variable. You can also enable/disable them using enable_progress_bars() and disable_progress_bars(). If set, the environment variable has priority on the helpers.

    >>> from huggingface_hub import snapshot_download
    >>> from huggingface_hub.utils import are_progress_bars_disabled, disable_progress_bars, enable_progress_bars

    >>> # Disable progress bars globally
    >>> disable_progress_bars()

    >>> # Progress bar will not be shown !
    >>> snapshot_download("gpt2")

    >>> are_progress_bars_disabled()
    True

    >>> # Re-enable progress bars globally
    >>> enable_progress_bars()

###
Group-specific control of progress bars

You can also enable or disable progress bars for specific groups. This allows you to manage progress bar visibility more granularly within different parts of your application or library. When a progress bar is disabled for a group, all subgroups under it are also affected unless explicitly overridden.

    # Disable progress bars for a specific group
    >>> disable_progress_bars("peft.foo")
    >>> assert not are_progress_bars_disabled("peft")
    >>> assert not are_progress_bars_disabled("peft.something")
    >>> assert are_progress_bars_disabled("peft.foo")
    >>> assert are_progress_bars_disabled("peft.foo.bar")

    # Re-enable progress bars for a subgroup
    >>> enable_progress_bars("peft.foo.bar")
    >>> assert are_progress_bars_disabled("peft.foo")
    >>> assert not are_progress_bars_disabled("peft.foo.bar")

    # Use groups with tqdm
    # No progress bar for `name="peft.foo"`
    >>> for _ in tqdm(range(5), name="peft.foo"):
    ...     pass

    # Progress bar will be shown for `name="peft.foo.bar"`
    >>> for _ in tqdm(range(5), name="peft.foo.bar"):
    ...     pass
    100%|███████████████████████████████████████| 5/5 [00:00<00:00, 117817.53it/s]

###
are_progress_bars_disabled

####
huggingface_hub.utils.are_progress_bars_disabled

< source >

( name: Optional = None ) →
`bool`

Parameters

- name (`str`, optional) — The group name to check; if None, checks the global setting.

Returns

`bool`

True if progress bars are disabled, False otherwise.

Check if progress bars are disabled globally or for a specific group.

This function returns whether progress bars are disabled for a given group or globally. It checks the `HF_HUB_DISABLE_PROGRESS_BARS` environment variable first, then the programmatic settings.

###
disable_progress_bars

####
huggingface_hub.utils.disable_progress_bars

< source >

( name: Optional = None )

Parameters

- name (`str`, optional) — The name of the group for which to disable the progress bars. If None, progress bars are disabled globally.

Raises

`Warning`

- `Warning` — If the environment variable precludes changes.

Disable progress bars either globally or for a specified group.

This function updates the state of progress bars based on a group name. If no group name is provided, all progress bars are disabled. The operation respects the `HF_HUB_DISABLE_PROGRESS_BARS` environment variable’s setting.

###
enable_progress_bars

####
huggingface_hub.utils.enable_progress_bars

< source >

( name: Optional = None )

Parameters

- name (`str`, optional) — The name of the group for which to enable the progress bars. If None, progress bars are enabled globally.

Raises

`Warning`

- `Warning` — If the environment variable precludes changes.

Enable progress bars either globally or for a specified group.

This function sets the progress bars to enabled for the specified group or globally if no group is specified. The operation is subject to the `HF_HUB_DISABLE_PROGRESS_BARS` environment setting.

##
Configure HTTP backend

In some environments, you might want to configure how HTTP calls are made, for example if you are using a proxy. `huggingface_hub` let you configure this globally using configure_http_backend(). All requests made to the Hub will then use your settings. Under the hood, `huggingface_hub` uses `requests.Session` so you might want to refer to the `requests` documentation to learn more about the available parameters.

Since `requests.Session` is not guaranteed to be thread-safe, `huggingface_hub` creates one session instance per thread. Using sessions allows us to keep the connection open between HTTP calls and ultimately save time. If you are integrating `huggingface_hub` in a third-party library and wants to make a custom call to the Hub, use get_session() to get a Session configured by your users (i.e. replace any `requests.get(...)` call by `get_session().get(...)`).

####
huggingface_hub.configure_http_backend

< source >

( backend_factory: Callable = <function _default_backend_factory at 0x7f0fba3f24d0> )

Configure the HTTP backend by providing a `backend_factory`. Any HTTP calls made by `huggingface_hub` will use a Session object instantiated by this factory. This can be useful if you are running your scripts in a specific environment requiring custom configuration (e.g. custom proxy or certifications).

Use get_session() to get a configured Session. Since `requests.Session` is not guaranteed to be thread-safe, `huggingface_hub` creates 1 Session instance per thread. They are all instantiated using the same `backend_factory` set in configure_http_backend(). A LRU cache is used to cache the created sessions (and connections) between calls. Max size is 128 to avoid memory leaks if thousands of threads are spawned.

See this issue to know more about thread-safety in `requests`.

Example:

    import requests
    from huggingface_hub import configure_http_backend, get_session

    # Create a factory function that returns a Session with configured proxies
    def backend_factory() -> requests.Session:
        session = requests.Session()
        session.proxies = {"http": "http://10.10.1.10:3128", "https": "https://10.10.1.11:1080"}
        return session

    # Set it as the default session factory
    configure_http_backend(backend_factory=backend_factory)

    # In practice, this is mostly done internally in `huggingface_hub`
    session = get_session()

####
huggingface_hub.get_session

< source >

( )

Get a `requests.Session` object, using the session factory from the user.

Use get_session() to get a configured Session. Since `requests.Session` is not guaranteed to be thread-safe, `huggingface_hub` creates 1 Session instance per thread. They are all instantiated using the same `backend_factory` set in configure_http_backend(). A LRU cache is used to cache the created sessions (and connections) between calls. Max size is 128 to avoid memory leaks if thousands of threads are spawned.

See this issue to know more about thread-safety in `requests`.

Example:

    import requests
    from huggingface_hub import configure_http_backend, get_session

    # Create a factory function that returns a Session with configured proxies
    def backend_factory() -> requests.Session:
        session = requests.Session()
        session.proxies = {"http": "http://10.10.1.10:3128", "https": "https://10.10.1.11:1080"}
        return session

    # Set it as the default session factory
    configure_http_backend(backend_factory=backend_factory)

    # In practice, this is mostly done internally in `huggingface_hub`
    session = get_session()

##
Handle HTTP errors

`huggingface_hub` defines its own HTTP errors to refine the `HTTPError` raised by `requests` with additional information sent back by the server.

###
Raise for status

hf_raise_for_status() is meant to be the central method to “raise for status” from any request made to the Hub. It wraps the base `requests.raise_for_status` to provide additional information. Any `HTTPError` thrown is converted into a `HfHubHTTPError`.

    import requests
    from huggingface_hub.utils import hf_raise_for_status, HfHubHTTPError

    response = requests.post(...)
    try:
        hf_raise_for_status(response)
    except HfHubHTTPError as e:
        print(str(e)) # formatted message
        e.request_id, e.server_message # details returned by server

        # Complete the error message with additional information once it's raised
        e.append_to_message("\n`create_commit` expects the repository to exist.")
        raise

####
huggingface_hub.utils.hf_raise_for_status

< source >

( response: Response endpoint_name: Optional = None )

Parameters

- response (`Response`) — Response from the server.
- endpoint_name (`str`, optional) — Name of the endpoint that has been called. If provided, the error message will be more complete.

Internal version of `response.raise_for_status()` that will refine a potential HTTPError. Raised exception will be an instance of `HfHubHTTPError`.

This helper is meant to be the unique method to raise_for_status when making a call to the Hugging Face Hub.

Example:

        import requests
        from huggingface_hub.utils import get_session, hf_raise_for_status, HfHubHTTPError

        response = get_session().post(...)
        try:
            hf_raise_for_status(response)
        except HfHubHTTPError as e:
            print(str(e)) # formatted message
            e.request_id, e.server_message # details returned by server

            # Complete the error message with additional information once it's raised
            e.append_to_message("
    ate_commit` expects the repository to exist.")
            raise

Raises when the request has failed:

- RepositoryNotFoundError If the repository to download from cannot be found. This may be because it doesn’t exist, because `repo_type` is not set correctly, or because the repo is `private` and you do not have access.
- GatedRepoError If the repository exists but is gated and the user is not on the authorized list.
- RevisionNotFoundError If the repository exists but the revision couldn’t be find.
- EntryNotFoundError If the repository exists but the entry (e.g. the requested file) couldn’t be find.
- BadRequestError If request failed with a HTTP 400 BadRequest error.
- HfHubHTTPError If request failed for a reason not listed above.

### HTTP errors

Here is a list of HTTP errors thrown in `huggingface_hub`.

#### HfHubHTTPError[[huggingface_hub.utils.HfHubHTTPError]]

`HfHubHTTPError` is the parent class for any HF Hub HTTP error. It takes care of parsing the server response and format the error message to provide as much information to the user as possible.

###
class huggingface_hub.utils.HfHubHTTPError

< source >

( message: str response: Optional = None )

HTTPError to inherit from for any custom HTTP Error raised in HF Hub.

Any HTTPError is converted at least into a `HfHubHTTPError`. If some information is sent back by the server, it will be added to the error message.

Added details:

- Request id from “X-Request-Id” header if exists.
- Server error message from the header “X-Error-Message”.
- Server error message if we can found one in the response body.

Example:

        import requests
        from huggingface_hub.utils import get_session, hf_raise_for_status, HfHubHTTPError

        response = get_session().post(...)
        try:
            hf_raise_for_status(response)
        except HfHubHTTPError as e:
            print(str(e)) # formatted message
            e.request_id, e.server_message # details returned by server

            # Complete the error message with additional information once it's raised
            e.append_to_message("
    ate_commit` expects the repository to exist.")
            raise

####
append_to_message

< source >

( additional_message: str )

Append additional information to the `HfHubHTTPError` initial message.

####
RepositoryNotFoundError

###
class huggingface_hub.utils.RepositoryNotFoundError

< source >

( message: str response: Optional = None )

Raised when trying to access a hf.co URL with an invalid repository name, or with a private repo name the user does not have access to.

Example:

    >>> from huggingface_hub import model_info
    >>> model_info("<non_existent_repository>")
    (...)
    huggingface_hub.utils._errors.RepositoryNotFoundError: 401 Client Error. (Request ID: PvMw_VjBMjVdMz53WKIzP)

    Repository Not Found for url: https://huggingface.co/api/models/%3Cnon_existent_repository%3E.
    Please make sure you specified the correct `repo_id` and `repo_type`.
    If the repo is private, make sure you are authenticated.
    Invalid username or password.

####
GatedRepoError

###
class huggingface_hub.utils.GatedRepoError

< source >

( message: str response: Optional = None )

Raised when trying to access a gated repository for which the user is not on the authorized list.

Note: derives from `RepositoryNotFoundError` to ensure backward compatibility.

Example:

    >>> from huggingface_hub import model_info
    >>> model_info("<gated_repository>")
    (...)
    huggingface_hub.utils._errors.GatedRepoError: 403 Client Error. (Request ID: ViT1Bf7O_026LGSQuVqfa)

    Cannot access gated repo for url https://huggingface.co/api/models/ardent-figment/gated-model.
    Access to model ardent-figment/gated-model is restricted and you are not in the authorized list.
    Visit https://huggingface.co/ardent-figment/gated-model to ask for access.

####
RevisionNotFoundError

###
class huggingface_hub.utils.RevisionNotFoundError

< source >

( message: str response: Optional = None )

Raised when trying to access a hf.co URL with a valid repository but an invalid revision.

Example:

    >>> from huggingface_hub import hf_hub_download
    >>> hf_hub_download('bert-base-cased', 'config.json', revision='<non-existent-revision>')
    (...)
    huggingface_hub.utils._errors.RevisionNotFoundError: 404 Client Error. (Request ID: Mwhe_c3Kt650GcdKEFomX)

    Revision Not Found for url: https://huggingface.co/bert-base-cased/resolve/%3Cnon-existent-revision%3E/config.json.

####
EntryNotFoundError

###
class huggingface_hub.utils.EntryNotFoundError

< source >

( message: str response: Optional = None )

Raised when trying to access a hf.co URL with a valid repository and revision but an invalid filename.

Example:

    >>> from huggingface_hub import hf_hub_download
    >>> hf_hub_download('bert-base-cased', '<non-existent-file>')
    (...)
    huggingface_hub.utils._errors.EntryNotFoundError: 404 Client Error. (Request ID: 53pNl6M0MxsnG5Sw8JA6x)

    Entry Not Found for url: https://huggingface.co/bert-base-cased/resolve/main/%3Cnon-existent-file%3E.

####
BadRequestError

###
class huggingface_hub.utils.BadRequestError

< source >

( message: str response: Optional = None )

Raised by `hf_raise_for_status` when the server returns a HTTP 400 error.

Example:

    >>> resp = requests.post("hf.co/api/check", ...)
    >>> hf_raise_for_status(resp, endpoint_name="check")
    huggingface_hub.utils._errors.BadRequestError: Bad request for check endpoint: {details} (Request ID: XXX)

####
LocalEntryNotFoundError

###
class huggingface_hub.utils.LocalEntryNotFoundError

< source >

( message: str )

Raised when trying to access a file or snapshot that is not on the disk when network is disabled or unavailable (connection issue). The entry may exist on the Hub.

Note: `ValueError` type is to ensure backward compatibility. Note: `LocalEntryNotFoundError` derives from `HTTPError` because of `EntryNotFoundError` even when it is not a network issue.

Example:

    >>> from huggingface_hub import hf_hub_download
    >>> hf_hub_download('bert-base-cased', '<non-cached-file>',  local_files_only=True)
    (...)
    huggingface_hub.utils._errors.LocalEntryNotFoundError: Cannot find the requested files in the disk cache and outgoing traffic has been disabled. To enable hf.co look-ups and downloads online, set 'local_files_only' to False.

####
OfflineModeIsEnabled

###
class huggingface_hub.errors.OfflineModeIsEnabled

< source >

( )

Raised when a request is made but `HF_HUB_OFFLINE=1` is set as environment variable.

##
Telemetry

`huggingface_hub` includes an helper to send telemetry data. This information helps us debug issues and prioritize new features. Users can disable telemetry collection at any time by setting the `HF_HUB_DISABLE_TELEMETRY=1` environment variable. Telemetry is also disabled in offline mode (i.e. when setting HF_HUB_OFFLINE=1).

If you are maintainer of a third-party library, sending telemetry data is as simple as making a call to `send_telemetry`. Data is sent in a separate thread to reduce as much as possible the impact for users.

####
huggingface_hub.utils.send_telemetry

< source >

( topic: str library_name: Optional = None library_version: Optional = None user_agent: Union = None )

Parameters

- topic (`str`) — Name of the topic that is monitored. The topic is directly used to build the URL. If you want to monitor subtopics, just use ”/” separation. Examples: “gradio”, “transformers/examples”,…
- library_name (`str`, optional) — The name of the library that is making the HTTP request. Will be added to the user-agent header.
- library_version (`str`, optional) — The version of the library that is making the HTTP request. Will be added to the user-agent header.
- user_agent (`str`, `dict`, optional) — The user agent info in the form of a dictionary or a single string. It will be completed with information about the installed packages.

Sends telemetry that helps tracking usage of different HF libraries.

This usage data helps us debug issues and prioritize new features. However, we understand that not everyone wants to share additional information, and we respect your privacy. You can disable telemetry collection by setting the `HF_HUB_DISABLE_TELEMETRY=1` as environment variable. Telemetry is also disabled in offline mode (i.e. when setting `HF_HUB_OFFLINE=1`).

Telemetry collection is run in a separate thread to minimize impact for the user.

Example:

    >>> from huggingface_hub.utils import send_telemetry

    # Send telemetry without library information
    >>> send_telemetry("ping")

    # Send telemetry to subtopic with library information
    >>> send_telemetry("gradio/local_link", library_name="gradio", library_version="3.22.1")

    # Send telemetry with additional data
    >>> send_telemetry(
    ...     topic="examples",
    ...     library_name="transformers",
    ...     library_version="4.26.0",
    ...     user_agent={"pipeline": "text_classification", "framework": "flax"},
    ... )

##
Validators

`huggingface_hub` includes custom validators to validate method arguments automatically. Validation is inspired by the work done in Pydantic to validate type hints but with more limited features.

###
Generic decorator

validate_hf_hub_args() is a generic decorator to encapsulate methods that have arguments following `huggingface_hub`’s naming. By default, all arguments that has a validator implemented will be validated.

If an input is not valid, a HFValidationError is thrown. Only the first non-valid value throws an error and stops the validation process.

Usage:

    >>> from huggingface_hub.utils import validate_hf_hub_args

    >>> @validate_hf_hub_args
    ... def my_cool_method(repo_id: str):
    ...     print(repo_id)

    >>> my_cool_method(repo_id="valid_repo_id")
    valid_repo_id

    >>> my_cool_method("other..repo..id")
    huggingface_hub.utils._validators.HFValidationError: Cannot have -- or .. in repo_id: 'other..repo..id'.

    >>> my_cool_method(repo_id="other..repo..id")
    huggingface_hub.utils._validators.HFValidationError: Cannot have -- or .. in repo_id: 'other..repo..id'.

    >>> @validate_hf_hub_args
    ... def my_cool_auth_method(token: str):
    ...     print(token)

    >>> my_cool_auth_method(token="a token")
    "a token"

    >>> my_cool_auth_method(use_auth_token="a use_auth_token")
    "a use_auth_token"

    >>> my_cool_auth_method(token="a token", use_auth_token="a use_auth_token")
    UserWarning: Both `token` and `use_auth_token` are passed (...). `use_auth_token` value will be ignored.
    "a token"

####
validate_hf_hub_args

####
huggingface_hub.utils.validate_hf_hub_args

< source >

( fn: CallableT )

Raises

HFValidationError

- HFValidationError — If an input is not valid.

Validate values received as argument for any public method of `huggingface_hub`.

The goal of this decorator is to harmonize validation of arguments reused everywhere. By default, all defined validators are tested.

Validators:

- validate_repo_id(): `repo_id` must be `"repo_name"` or `"namespace/repo_name"`. Namespace is a username or an organization.
- smoothly_deprecate_use_auth_token(): Use `token` instead of `use_auth_token` (only if `use_auth_token` is not expected by the decorated function - in practice, always the case in `huggingface_hub`).

Example:

    >>> from huggingface_hub.utils import validate_hf_hub_args

    >>> @validate_hf_hub_args
    ... def my_cool_method(repo_id: str):
    ...     print(repo_id)

    >>> my_cool_method(repo_id="valid_repo_id")
    valid_repo_id

    >>> my_cool_method("other..repo..id")
    huggingface_hub.utils._validators.HFValidationError: Cannot have -- or .. in repo_id: 'other..repo..id'.

    >>> my_cool_method(repo_id="other..repo..id")
    huggingface_hub.utils._validators.HFValidationError: Cannot have -- or .. in repo_id: 'other..repo..id'.

    >>> @validate_hf_hub_args
    ... def my_cool_auth_method(token: str):
    ...     print(token)

    >>> my_cool_auth_method(token="a token")
    "a token"

    >>> my_cool_auth_method(use_auth_token="a use_auth_token")
    "a use_auth_token"

    >>> my_cool_auth_method(token="a token", use_auth_token="a use_auth_token")
    UserWarning: Both `token` and `use_auth_token` are passed (...)
    "a token"

####
HFValidationError

###
class huggingface_hub.errors.HFValidationError

< source >

( )

Generic exception thrown by `huggingface_hub` validators.

Inherits from `ValueError`.

###
Argument validators

Validators can also be used individually. Here is a list of all arguments that can be validated.

####
repo_id

####
huggingface_hub.utils.validate_repo_id

< source >

( repo_id: str )

Validate `repo_id` is valid.

This is not meant to replace the proper validation made on the Hub but rather to avoid local inconsistencies whenever possible (example: passing `repo_type` in the `repo_id` is forbidden).

Rules:

- Between 1 and 96 characters.
- Either “repo_name” or “namespace/repo_name”
- [a-zA-Z0-9] or ”-”, ”_”, ”.”
- ”—” and ”..” are forbidden

Valid: `"foo"`, `"foo/bar"`, `"123"`, `"Foo-BAR_foo.bar123"`

Not valid: `"datasets/foo/bar"`, `".repo_id"`, `"foo--bar"`, `"foo.git"`

Example:

    >>> from huggingface_hub.utils import validate_repo_id
    >>> validate_repo_id(repo_id="valid_repo_id")
    >>> validate_repo_id(repo_id="other..repo..id")
    huggingface_hub.utils._validators.HFValidationError: Cannot have -- or .. in repo_id: 'other..repo..id'.

Discussed in https://github.com/huggingface/huggingface_hub/issues/1008. In moon-landing (internal repository):

- https://github.com/huggingface/moon-landing/blob/main/server/lib/Names.ts#L27
- https://github.com/huggingface/moon-landing/blob/main/server/views/components/NewRepoForm/NewRepoForm.svelte#L138

####
smoothly_deprecate_use_auth_token

Not exactly a validator, but ran as well.

####
huggingface_hub.utils.smoothly_deprecate_use_auth_token

< source >

( fn_name: str has_token: bool kwargs: Dict )

Smoothly deprecate `use_auth_token` in the `huggingface_hub` codebase.

The long-term goal is to remove any mention of `use_auth_token` in the codebase in favor of a unique and less verbose `token` argument. This will be done a few steps:

0. Step 0: methods that require a read-access to the Hub use the `use_auth_token` argument (`str`, `bool` or `None`). Methods requiring write-access have a `token` argument (`str`, `None`). This implicit rule exists to be able to not send the token when not necessary (`use_auth_token=False`) even if logged in.

1. Step 1: we want to harmonize everything and use `token` everywhere (supporting `token=False` for read-only methods). In order not to break existing code, if `use_auth_token` is passed to a function, the `use_auth_token` value is passed as `token` instead, without any warning. a. Corner case: if both `use_auth_token` and `token` values are passed, a warning is thrown and the `use_auth_token` value is ignored.

2. Step 2: Once it is release, we should push downstream libraries to switch from `use_auth_token` to `token` as much as possible, but without throwing a warning (e.g. manually create issues on the corresponding repos).

3. Step 3: After a transitional period (6 months e.g. until April 2023?), we update `huggingface_hub` to throw a warning on `use_auth_token`. Hopefully, very few users will be impacted as it would have already been fixed. In addition, unit tests in `huggingface_hub` must be adapted to expect warnings to be thrown (but still use `use_auth_token` as before).

4. Step 4: After a normal deprecation cycle (3 releases ?), remove this validator. `use_auth_token` will definitely not be supported. In addition, we update unit tests in `huggingface_hub` to use `token` everywhere.

This has been discussed in:

- https://github.com/huggingface/huggingface_hub/issues/1094.
- https://github.com/huggingface/huggingface_hub/pull/928
- (related) https://github.com/huggingface/huggingface_hub/pull/1064

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