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Build an input_fn appropriate for serving, expecting fed tf.Examples. (deprecated)

Creates an input_fn that expects a serialized tf.Example fed into a string placeholder. The function parses the tf.Example according to the provided feature_spec, and returns all parsed Tensors as features. This input_fn is for use at serving time, so the labels return value is always None.

feature_spec a dict of string to VarLenFeature/FixedLenFeature.
default_batch_size the number of query examples expected per batch. Leave unset for variable batch size (recommended).

An input_fn suitable for use in serving.