tf.keras.callbacks.SidecarEvaluatorModelExport

Callback to save the best Keras model.

Inherits From: ModelCheckpoint, Callback

tf.keras.callbacks.SidecarEvaluatorModelExport(
    export_filepath, checkpoint_filepath, **kwargs
)

It expands the functionality of the existing ModelCheckpoint callback to enable exporting the best models after evaluation with validation dataset.

When using the SidecarEvaluatorModelExport callback in conjunction with keras.utils.SidecarEvaluator, users should provide the filepath, which is the path for this callback to export model or save weights to, and ckpt_filepath, which is where the checkpoint is available to extract the epoch number from. The callback will then export the model that the evaluator deems as the best (among the checkpoints saved by the training counterpart) to the specified filepath. This callback is intended to be used by SidecarEvaluator only.

Example:

model.compile(loss=..., optimizer=...,
              metrics=['accuracy'])
sidecar_evaluator = keras.utils.SidecarEvaluator(
    model=model,
    data=dataset,
    checkpoint_dir=checkpoint_dir,
    max_evaluations=1,
    callbacks=[
        SidecarEvaluatorModelExport(
            export_filepath=os.path.join(checkpoint_dir,
                                  'best_model_eval',
                                  'best-model-{epoch:04d}'),
            checkpoint_filepath=os.path.join(checkpoint_dir,
            'ckpt-{epoch:04d}'),
            save_freq="eval",
            save_weights_only=True,
            monitor="loss",
            mode="min",
            verbose=1,
        ),
    ],
)
sidecar_evaluator.start()
# Model weights are saved if evaluator deems it's the best seen so far.

<!-- Tabular view -->
 <table class="responsive fixed orange">
<colgroup><col width="214px"><col></colgroup>
<tr><th colspan="2"><h2 class="add-link">Args</h2></th></tr>

<tr>
<td>
`export_filepath`<a id="export_filepath"></a>
</td>
<td>
Path where best models should be saved by this
`SidecarEvaluatorModelExport` callback. Epoch formatting options, such
as `os.path.join(best_model_dir, 'best-model-{epoch:04d}')`, can be
used to allow saved model to preserve epoch information in the file
name. SidecarEvaluatorModelExport will use the "training epoch" at
which the checkpoint was saved by training to fill the epoch
placeholder in the path.
</td>
</tr><tr>
<td>
`checkpoint_filepath`<a id="checkpoint_filepath"></a>
</td>
<td>
Path where checkpoints were saved by training. This
should be the same as what is provided to `filepath` argument of
`ModelCheckpoint` on the training side, such as
`os.path.join(checkpoint_dir, 'ckpt-{epoch:04d}')`.
</td>
</tr>
</table>



## Methods

<h3 id="set_model"><code>set_model</code></h3>

<a target="_blank" class="external" href="https://github.com/keras-team/keras/tree/v2.15.0/keras/callbacks.py#L694-L695">View source</a>

<pre class="devsite-click-to-copy prettyprint lang-py tfo-signature-link">
<code>set_model(
    model
)
</code></pre>




<h3 id="set_params"><code>set_params</code></h3>

<a target="_blank" class="external" href="https://github.com/keras-team/keras/tree/v2.15.0/keras/callbacks.py#L691-L692">View source</a>

<pre class="devsite-click-to-copy prettyprint lang-py tfo-signature-link">
<code>set_params(
    params
)
</code></pre>