def METHOD_NAME(self, opt):
    """
    Determine which side(s) of the conversation to use.
    """
    base_datatype = self._get_base_datatype(opt)
    return (
        opt.get('train_experiencer_only', DEFAULT_TRAIN_EXPERIENCER_ONLY)
        and base_datatype == 'train'
    ) or base_datatype != 'train'