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Prefix Caching with FP8 KV cache support #3234

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Prefix Caching with FP8 KV cache support #3234

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f60fd43
remove triton version check
chenxu2048 Mar 6, 2024
145e9c9
feat: prefix caching with fp8 kvcache
chenxu2048 Mar 6, 2024
9970b79
add triton version check
chenxu2048 Mar 6, 2024
5d31fe7
update triton version to 2.2.0
chenxu2048 Mar 7, 2024
22eddd8
format code
chenxu2048 Mar 7, 2024
d2a3036
convert to fp16 in _fwd_kernel_alibi
chenxu2048 Mar 7, 2024
20523b4
Merge remote-tracking branch 'origin/main' into prefix_fp8_kvcache
chenxu2048 Mar 11, 2024
8223978
Align to Q type
chenxu2048 Mar 11, 2024
8ecc90d
Use torch.fp8_e5m2 instead of torch.uint8 in python interface
zhaoyang-star Mar 13, 2024
e4e92ce
Merge pull request #1 from chenxu2048/fp8_e5m2
chenxu2048 Mar 13, 2024
5afb543
Use torch.fp8_e5m2 as fp8 kvcache dtype
chenxu2048 Mar 13, 2024
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3 changes: 2 additions & 1 deletion csrc/dispatch_utils.h
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Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,13 @@
AT_DISPATCH_CASE(at::ScalarType::Float, __VA_ARGS__) \
AT_DISPATCH_CASE(at::ScalarType::Half, __VA_ARGS__) \
AT_DISPATCH_CASE(at::ScalarType::BFloat16, __VA_ARGS__) \
AT_DISPATCH_CASE(at::ScalarType::Float8_e5m2, __VA_ARGS__)\
AT_DISPATCH_CASE(at::ScalarType::Byte, __VA_ARGS__)

#define VLLM_DISPATCH_FLOATING_AND_BYTE_TYPES(TYPE, NAME, ...) \
AT_DISPATCH_SWITCH( \
TYPE, NAME, VLLM_DISPATCH_CASE_FLOATING_AND_BYTE_TYPES(__VA_ARGS__))

#define VLLM_DISPATCH_CASE_INTEGRAL_TYPES(...) \
AT_DISPATCH_CASE(at::ScalarType::Byte, __VA_ARGS__) \
AT_DISPATCH_CASE(at::ScalarType::Char, __VA_ARGS__) \
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2 changes: 1 addition & 1 deletion requirements.txt
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Expand Up @@ -11,6 +11,6 @@ uvicorn[standard]
pydantic >= 2.0 # Required for OpenAI server.
prometheus_client >= 0.18.0
pynvml == 11.5.0
triton >= 2.1.0
triton >= 2.2.0
outlines >= 0.0.27
cupy-cuda12x == 12.1.0 # Required for CUDA graphs. CUDA 11.8 users should install cupy-cuda11x instead.
8 changes: 8 additions & 0 deletions tests/kernels/test_cache.py
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Expand Up @@ -92,9 +92,17 @@ def test_copy_blocks(

# Compare the results.
for key_cache, cloned_key_cache in zip(key_caches, cloned_key_caches):
# NOTE: torch.allclose has not supported
# torch.fp8_e5m2/torch.fp8_e4m3fn dtypes.
if kv_cache_dtype == "fp8_e5m2":
key_cache = key_cache.view(torch.half)
cloned_key_cache = cloned_key_cache.view(torch.half)
assert torch.allclose(key_cache, cloned_key_cache)
for value_cache, cloned_value_cache in zip(value_caches,
cloned_value_caches):
if kv_cache_dtype == "fp8_e5m2":
value_cache = value_cache.view(torch.half)
cloned_value_cache = cloned_value_cache.view(torch.half)
assert torch.allclose(value_cache, cloned_value_cache)


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