def METHOD_NAME(self):
    """Convert the ExponentialBackoffRetryPolicy instance to protobuf.
    :return: A protobuf message that represents the ExponentialBackoffRetryPolicy instance.
    """
    exponential_backoff = {
        'Multiplier': self.backoff_multiplier,
        'Max': Duration.FromTimedelta(self.max_backoff),
        'Initial': Duration.FromTimedelta(self.initial_backoff)
    }
    return {
        'MaxAttempts': self._max_attempts,
        'ExponentialBackoff': exponential_backoff
    }