GitLab

* check in the two ways of approaching backwards for softcapping, both functional

* prepare the softcap switch for backwards

* temporary

* cleanup to the way Tri prefers

* calculate dtanh when copying from scores -> dtanh Tensor

* no ternary operators allowed for constexpr, so just use some hack found online

* fix maybe_dtanh, restore some files

* restore another file

* move calculate_dtanh to utils and colocate with apply_softcap

* cleanup

* maybe last cleanup

* save for another pr

* remove a stray line

* fix spacing

* fix an issue, and make test_flash_attn.py ready to test softcapping backwards