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Signed-off-by: Lu Fang <lufang@fb.com>

Signed-off-by: Kazuhiro Serizawa <nserihiro@gmail.com>

Signed-off-by: Wallas Santos <wallashss@ibm.com>

Signed-off-by: youkaichao <youkaichao@gmail.com>

Signed-off-by: Travis Johnson <tsjohnso@us.ibm.com>

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com>
Co-authored-by: Nick Hill <nickhill@us.ibm.com>

[Speculative Decoding 1/2 ] Add typical acceptance sampling as one of the sampling techniques in the verifier (#5131)

[Core][2/N] Model runner refactoring part 2. Combine prepare prefill / decode to a single API (#4681)

This PR combines prepare_prompt and prepare_decode into a single API. This PR also coelsce the attn metadata for prefill/decode to a single class and allow to slice them when running attn backend.

It also refactors subquery_start_loc which was not refactored in the previous PR

Co-authored-by: Cade Daniel <edacih@gmail.com>