* Add s2_attn to hijack flash code
* Refactor code to account for s2_attn
* Add test for models utils
* Add ``s2_attention`` option to llama configs
* Add ``s2_attention`` option to README config
* Format code to appease linter
* chore: lint
* Remove xpos and llama-landmark [bad merge]
* add e2e smoke tests for shifted sparse attention
* remove stray patch from merge
* update yml with link to paper for s2_attention/longlora
* fix assertion check for full fine tune
* increase sequence len for tests and PR feedback updates
* reduce context len to 16k for tests
* reduce context len to 16k for tests
* reduce batch size for larger context len and udpate test to check message
* fix test for message
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Co-authored-by: joecummings <jrcummings@devvm050.nha0.facebook.com>
Co-authored-by: Wing Lian <wing.lian@gmail.com>
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