keras: callback_lambda – R documentation

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callback_lambda

Create a custom callback

Description

This callback is constructed with anonymous functions that will be called at the appropriate time. Note that the callbacks expects positional arguments, as:

on_epoch_begin and on_epoch_end expect two positional arguments: epoch, logs
on_batch_*, on_train_batch_*, on_predict_batch_* and on_test_batch_*, expect two positional arguments: batch, logs
on_train_*, on_test_* and on_predict_* expect one positional argument: logs

Usage

callback_lambda(
  on_epoch_begin = NULL,
  on_epoch_end = NULL,
  on_batch_begin = NULL,
  on_batch_end = NULL,
  on_train_batch_begin = NULL,
  on_train_batch_end = NULL,
  on_train_begin = NULL,
  on_train_end = NULL,
  on_predict_batch_begin = NULL,
  on_predict_batch_end = NULL,
  on_predict_begin = NULL,
  on_predict_end = NULL,
  on_test_batch_begin = NULL,
  on_test_batch_end = NULL,
  on_test_begin = NULL,
  on_test_end = NULL
)

Arguments

`on_epoch_begin`	called at the beginning of every epoch.
`on_epoch_end`	called at the end of every epoch.
`on_batch_begin`	called at the beginning of every training batch.
`on_batch_end`	called at the end of every training batch.
`on_train_batch_begin`	called at the beginning of every batch.
`on_train_batch_end`	called at the end of every batch.
`on_train_begin`	called at the beginning of model training.
`on_train_end`	called at the end of model training.
`on_predict_batch_begin`	called at the beginning of a batch in predict methods.
`on_predict_batch_end`	called at the end of a batch in predict methods.
`on_predict_begin`	called at the beginning of prediction.
`on_predict_end`	called at the end of prediction.
`on_test_batch_begin`	called at the beginning of a batch in evaluate methods. Also called at the beginning of a validation batch in the fit methods, if validation data is provided.
`on_test_batch_end`	called at the end of a batch in evaluate methods. Also called at the end of a validation batch in the fit methods, if validation data is provided.
`on_test_begin`	called at the beginning of evaluation or validation.
`on_test_end`	called at the end of evaluation or validation.

callback_lambda

Description

Usage

Arguments

See Also

keras

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