Hello,
I have added to the GPT-2 vocabulary two special tokens ([ss], [se]) and use it to generate sequences.
I want to prohibit GPT-2 from generating some words after having generated [ss] until it generates [se] . For example in the following sequence

some words of the sequence [ss] here I want some words not to be generated [se] other words of the sequence.

in other words, I want between [ss] … [se] to exclude some words from the generation. As  @deathcrush answered here 1 it is possible to prohibit GPT-2 from generating some vocabulary ids in general, but is it possible to do it on condition? (only between those tokens [ss] and [se])