def __init__(self, input_key: str, output_key: str):
        """
        Args:
            input_key: input key to use from annotation dict
            output_key: output key to use to store the result,
                default: ``input_key``
        """
        self.input_key = input_key
        self.output_key = output_key

        Args:
            input_key: input key to use from annotation dict
            output_key: output key to use to store the result,
                default: ``input_key``
        
catalyst/contrib/data/reader.py