def METHOD_NAME(self, batch_text, add_special_tokens=False):
    # assert False
    assert type(batch_text) in [list, tuple], (type(batch_text))
    tokens = [self.tok.METHOD_NAME(x, add_special_tokens=False) for x in batch_text]
    if not add_special_tokens:
        return tokens
    prefix, suffix = [self.cls_token, self.Q_marker_token], [self.sep_token]
    tokens = [prefix + lst + suffix + [self.mask_token] * (self.query_maxlen - (len(lst)+3)) for lst in tokens]
    return tokens