[ET-VK][LlaMa] Split SDPA + KV cache operator into SDPA operator and KV cache update operator #8064
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…KV cache update operator ## Context #7413 and #7412 split the `sdpa_with_kv_cache` operator into two separate operators, `update_cache` and `custom_sdpa` to decouple the cache update step from the actual SDPA computation. As a result, SDPA is no longer being delegated on Vulkan because of this interface change. To rectify this, Vulkan must also split `sdpa_with_kv_cache` into two operators. Note that during this diff the new operators are not partitioned yet because of complications caused by assertion ops in the graph. The next diff adds a pass to remove such assertion ops which allows the new operators to be partitioned. Differential Revision: [D68916952](https://our.internmc.facebook.com/intern/diff/D68916952/) [ghstack-poisoned]
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8064
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Stack from ghstack (oldest at bottom):
Context
#7413 and #7412 split the
sdpa_with_kv_cacheoperator into two separate operators,update_cacheandcustom_sdpato decouple the cache update step from the actual SDPA computation.As a result, SDPA is no longer being delegated on Vulkan because of this interface change. To rectify this, Vulkan must also split
sdpa_with_kv_cacheinto two operators.Note that during this diff the new operators are not partitioned yet because of complications caused by assertion ops in the graph. The next diff adds a pass to remove such assertion ops which allows the new operators to be partitioned.
Differential Revision: D68916952