| This will only truncate | |
| the second sentence of a pair if a pair of sequences (or a batch of pairs of sequences) is provided. | |
| 'only_first': truncate to a maximum length specified by the max_length argument or the maximum | |
| length accepted by the model if no max_length is provided (max_length=None). This will only truncate | |
| the first sentence of a pair if a pair of sequences (or a batch of pairs of sequences) is provided. | |
| False or 'do_not_truncate': no truncation is applied. |