def none(self, type_name):
    """An empty set for some type.

    Args:
      type_name: the string type name

    Returns:
      A NeuralQueryExpression for an all-zeros vector for the types.
    """
    provenance = NQExprProvenance(operation='none', args=(type_name, None))
    np_vec = self.zeros_numpy_array(type_name, as_matrix=True)
    return self.as_nql(np_vec, type_name, provenance)
An empty set for some type.

    Args:
      type_name: the string type name

    Returns:
      A NeuralQueryExpression for an all-zeros vector for the types.
    
language/nql/nql/__init__.py