parameters: (signature_def)
return_statement: return (_is_valid_classification_signature(signature_def) or
            _is_valid_regression_signature(signature_def) or
            _is_valid_predict_signature(signature_def))
docstring: Determine whether a SignatureDef can be served by TensorFlow Serving.
docstring_summary: Determine whether a SignatureDef can be served by TensorFlow Serving.
docstring_tokens: Determine whether a SignatureDef can be served by TensorFlow Serving .
function: def is_valid_signature(signature_def):
    """Determine whether a SignatureDef can be served by TensorFlow Serving."""
    if signature_def is None:
      return False
    return (_is_valid_classification_signature(signature_def) or
            _is_valid_regression_signature(signature_def) or
            _is_valid_predict_signature(signature_def))
function_tokens: def is_valid_signature ( signature_def ) : if signature_def is None : return False return ( _is_valid_classification_signature ( signature_def ) or _is_valid_regression_signature ( signature_def ) or _is_valid_predict_signature ( signature_def ) )