[DONOTMERGE] [TEST-ONLY] vLLM-Base: Full enabling of ALiBi #789
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Changes:
- Added back alibi biases to decode stage.
- Optimized ALiBI memory usage.
- Added environment variable "VLLM_PROMPT_ALIBI_MAX_SEQ_LEN" to allow
large models to run with restricted prompt lengths.
- Prompt biases instantiated once rather than each forward.
- Prompt and decode biases are shared across encoder/decoder layers.
- Added environment variable "VLLM_ALIBI_USE_FLOAT32_BIASES" to resolve
accuracy issue on long sequences.
- Works in lazy and eager mode.
- ALiBI is restricted to "VLLM_PROMPT_USE_FUSEDSDPA=false", and
"VLLM_CONTIGUOUS_PA=true".
- NTT patch for GQA
Co-authored-by: Tanner Voas <[email protected]>
Co-authored-by: Haihao Xiang <[email protected]>
Signed-off-by: Tanner Voas <[email protected]>
madamczykhabana
deleted the
test/tannervoas742/restore_alibi_for_flat_pa_final
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Only for testing: #503