def to_yaml(self, **kwargs):
"""Returns a yaml string containing the network configuration.
To load a network from a yaml save file, use
`keras.models.model_from_yaml(yaml_string, custom_objects={})`.
`custom_objects` should be a dictionary mapping
the names of custom losses / layers / etc to the corresponding
functions / classes.
Arguments:
**kwargs: Additional keyword arguments
to be passed to `yaml.dump()`.
Returns:
A YAML string.
Raises:
ImportError: if yaml module is not found.
"""
if yaml is None:
raise ImportError('Requires yaml module installed.')
return yaml.dump(self._updated_config(), **kwargs)
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