import tensorflow as tf

  # If the vocabulary is empty add a dummy value with count one so
  # the tensorflow index operations don't fail to initialize with empty
  # tensors downstream.
  dummy_value = (b'49d0cd50-04bb-48c0-bc6f-5b575dce351a'
                 if tf.dtypes.as_dtype(dtype) == tf.string else b'-1')
  return (1, dummy_value)


