#
Logging

🤗 Transformers has a centralized logging system, so that you can setup the verbosity of the library easily.

Currently the default verbosity of the library is `WARNING`.

To change the level of verbosity, just use one of the direct setters. For instance, here is how to change the verbosity to the INFO level.

    import transformers

    transformers.logging.set_verbosity_info()

You can also use the environment variable `TRANSFORMERS_VERBOSITY` to override the default verbosity. You can set it to one of the following: `debug`, `info`, `warning`, `error`, `critical`. For example:

    TRANSFORMERS_VERBOSITY=error ./myprogram.py

Additionally, some `warnings` can be disabled by setting the environment variable `TRANSFORMERS_NO_ADVISORY_WARNINGS` to a true value, like 1. This will disable any warning that is logged using `logger.warning_advice`. For example:

    TRANSFORMERS_NO_ADVISORY_WARNINGS=1 ./myprogram.py

Here is an example of how to use the same logger as the library in your own module or script:

    from transformers.utils import logging

    logging.set_verbosity_info()
    logger = logging.get_logger("transformers")
    logger.info("INFO")
    logger.warning("WARN")

All the methods of this logging module are documented below, the main ones are logging.get_verbosity() to get the current level of verbosity in the logger and logging.set_verbosity() to set the verbosity to the level of your choice. In order (from the least verbose to the most verbose), those levels (with their corresponding int values in parenthesis) are:

- `transformers.logging.CRITICAL` or `transformers.logging.FATAL` (int value, 50): only report the most critical errors.
- `transformers.logging.ERROR` (int value, 40): only report errors.
- `transformers.logging.WARNING` or `transformers.logging.WARN` (int value, 30): only reports error and warnings. This the default level used by the library.
- `transformers.logging.INFO` (int value, 20): reports error, warnings and basic information.
- `transformers.logging.DEBUG` (int value, 10): report all information.

By default, `tqdm` progress bars will be displayed during model download. logging.disable_progress_bar() and logging.enable_progress_bar() can be used to suppress or unsuppress this behavior.

##
logging vs warnings

Python has two logging systems that are often used in conjunction: `logging`, which is explained above, and `warnings`, which allows further classification of warnings in specific buckets, e.g., `FutureWarning` for a feature or path that has already been deprecated and `DeprecationWarning` to indicate an upcoming deprecation.

We use both in the `transformers` library. We leverage and adapt `logging`’s `captureWarning` method to allow management of these warning messages by the verbosity setters above.

What does that mean for developers of the library? We should respect the following heuristic:

- `warnings` should be favored for developers of the library and libraries dependent on `transformers`
- `logging` should be used for end-users of the library using it in every-day projects

See reference of the `captureWarnings` method below.

####
transformers.utils.logging.captureWarnings

< source >

( capture )

Calls the `captureWarnings` method from the logging library to enable management of the warnings emitted by the `warnings` library.

Read more about this method here: https://docs.python.org/3/library/logging.html#integration-with-the-warnings-module

All warnings will be logged through the `py.warnings` logger.

Careful: this method also adds a handler to this logger if it does not already have one, and updates the logging level of that logger to the library’s root logger.

##
Base setters

####
transformers.utils.logging.set_verbosity_error

< source >

( )

Set the verbosity to the `ERROR` level.

####
transformers.utils.logging.set_verbosity_warning

< source >

( )

Set the verbosity to the `WARNING` level.

####
transformers.utils.logging.set_verbosity_info

< source >

( )

Set the verbosity to the `INFO` level.

####
transformers.utils.logging.set_verbosity_debug

< source >

( )

Set the verbosity to the `DEBUG` level.

##
Other functions

####
transformers.utils.logging.get_verbosity

< source >

( ) →
`int`

Returns

`int`

The logging level.

Return the current level for the 🤗 Transformers’s root logger as an int.

🤗 Transformers has following logging levels:

- 50: `transformers.logging.CRITICAL` or `transformers.logging.FATAL`
- 40: `transformers.logging.ERROR`
- 30: `transformers.logging.WARNING` or `transformers.logging.WARN`
- 20: `transformers.logging.INFO`
- 10: `transformers.logging.DEBUG`

####
transformers.utils.logging.set_verbosity

< source >

( verbosity: int )

Parameters

- verbosity (`int`) — Logging level, e.g., one of:
  - `transformers.logging.CRITICAL` or `transformers.logging.FATAL`
  - `transformers.logging.ERROR`
  - `transformers.logging.WARNING` or `transformers.logging.WARN`
  - `transformers.logging.INFO`
  - `transformers.logging.DEBUG`

Set the verbosity level for the 🤗 Transformers’s root logger.

####
transformers.utils.logging.get_logger

< source >

( name: typing.Optional[str] = None )

Return a logger with the specified name.

This function is not supposed to be directly accessed unless you are writing a custom transformers module.

####
transformers.utils.logging.enable_default_handler

< source >

( )

Enable the default handler of the HuggingFace Transformers’s root logger.

####
transformers.utils.logging.disable_default_handler

< source >

( )

Disable the default handler of the HuggingFace Transformers’s root logger.

####
transformers.utils.logging.enable_explicit_format

< source >

( )

Enable explicit formatting for every HuggingFace Transformers’s logger. The explicit formatter is as follows:

        [LEVELNAME|FILENAME|LINE NUMBER] TIME >> MESSAGE

All handlers currently bound to the root logger are affected by this method.

####
transformers.utils.logging.reset_format

< source >

( )

Resets the formatting for HuggingFace Transformers’s loggers.

All handlers currently bound to the root logger are affected by this method.

####
transformers.utils.logging.enable_progress_bar

< source >

( )

Enable tqdm progress bar.

####
transformers.utils.logging.disable_progress_bar

< source >

( )

Disable tqdm progress bar.