transformers

503541d7 - add FlashAttentionKwargs and seq_idx to flat collator (#36456)

add FlashAttentionKwargs and seq_idx to flat collator (#36456) * add flash attn kwargs to flattening collator * add return_seq_idx option * doc string edits * cleaner max len updates * various fixes * temp testing code * return int32 seq_idx and FlashAttnKwargs * DataCollatorIntegrationTest impl * fix batch dims and dtypes * fill out remaining collator tests * test name change and fmt * rm unused var * fmt * minor change * fmt * add missing pos_ids check * consistent {np,pt,tf} tests * split pt tests into 3, like np/tf tests * mv comment, rename fa test * remove batch dim comment * simply wrapping * compute cu_seq_len/max_length once * fmt * remove tf code * rm warning * move separator_id back to 2nd pos * use cleaner lists in tests * ret -> batch * fmt * attr ordering * use py ints for max_length_{k,q}