Exports to SavedModel format.

export_module a ExportModule with the keras Model and serving tf.functions.
function_keys a list of string keys to retrieve pre-defined serving signatures. The signaute keys will be set with defaults. If a dictionary is provided, the values will be used as signature keys.
export_savedmodel_dir Output saved model directory.
checkpoint_path Object-based checkpoint path or directory.
timestamped Whether to export the savedmodel to a timestamped directory.
save_options SaveOptions for
checkpoint An optional tf.train.Checkpoint. If provided, the export module will use it to read the weights.

The savedmodel directory path.