Returns a receiver function with the provided parsing_fn.

parsing_fn (function) It has a single argument parsing_fn(serialized). Users can customize this for their own data formats.
receiver_name (string) The name for the receiver Tensor that contains the serialized data.
default_batch_size (int) Number of instances expected per batch. Leave unset for variable batch size (recommended).

A tf.estimator.export.ServingInputReceiver object, which packages the placeholders and the resulting feature Tensors together.