def METHOD_NAME(tensor, name=None, prefix=None,
                              print_summary=False):
  """Adds a summary for the percentage of zero values in the given tensor.
  Args:
    tensor: a variable or op tensor.
    name: the optional name for the summary.
    prefix: An optional prefix for the summary names.
    print_summary: If `True`, the summary is printed to stdout when the summary
      is computed.
  Returns:
    A scalar `Tensor` of type `string` whose contents are the serialized
    `Summary` protocol buffer.
  """
  name = _get_summary_name(tensor, name, prefix, 'Fraction_of_Zero_Values')
  tensor = nn.zero_fraction(tensor)
  return add_scalar_summary(tensor, name, print_summary=print_summary)