composer.Logger

The trainer includes a Logger, which routes logging calls to logger backends. Each logger backend inherits from BaseLoggerBackend, which inherits from Callback.

For example, to define a new logging backend:

from composer.core.logging import BaseLoggerBackend

class MyLoggerBackend(BaseLoggerBackend)

    def log_metric(self, epoch, step, log_level, data):
        print(f'Epoch {epoch} Step {step}: {log_level} {data}')

Note

To use Composer’s built in loggers, see composer.loggers.

`BaseLoggerBackendHparams`	Base class for logger backend hyperparameters.
`BaseLoggerBackend`	Base class for logging backends.
`RankZeroLoggerBackend`	Base class for logging backends that run only on the rank zero process.

class composer.Logger(state: State, backends: Sequence[BaseLoggerBackend] = ())[source]

Logger routes metrics to the BaseLoggerBackend.

Parameters

state (State) – The global State object.
backends (Sequence[BaseLoggerBackend]) – A sequence of BaseLoggerBackends to which logging calls will be sent.

backends

A sequence of BaseLoggerBackends to which logging calls will be sent.

Type: Sequence[BaseLoggerBackend]