What does this warning mean? -overflowing tokens are not returned for the setting you have chosen

Running tokenizer on dataset: 28%|β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ– | 111/393 [00:28<01:12, 3.88ba/s][WARNING|tokenization_utils_base.py:3048] 2021-11-11 10:46:54,553 >> Be aware, overflowing tokens are not returned for the setting you have chosen, i.e. sequence pairs with the β€˜longest_first’ truncation strategy. So the returned list will always be empty even if some tokens have been removed.

Not sure if this is the right category for it.

have you found the solution ? @NDugar
may be its related to truncation=True in tokenizer