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[Bugfix] Only add Attention.kv_scale if kv cache quantization is enabled (#5936)

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Michael Goin 2024-06-28 17:12:40 -04:00 committed by GitHub
parent be0b3af9e0
commit 4bf35ed9ae
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1 changed files with 14 additions and 9 deletions
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23
vllm/attention/layer.py
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@ -9,6 +9,7 @@ from vllm.attention.selector import get_attn_backend
from vllm.config import CacheConfig
from vllm.model_executor.layers.quantization.base_config import (
QuantizationConfig)
from vllm.model_executor.layers.quantization.fp8 import Fp8KVCacheMethod
class Attention(nn.Module):
@ -56,15 +57,19 @@ class Attention(nn.Module):
quant_method = quant_config.get_quant_method(
self) if quant_config else None
if quant_method is not None:
if self.kv_cache_dtype == "fp8_e5m2":
raise ValueError("fp8_e5m2 kv-cache is not supported with "
"fp8 checkpoints.")
# When FP8 quantization is enabled, we make a parameter
# "kv_scale" so that it can be loaded from FP8 checkpoint.
# The kv_scale will then be converted back
# to self._kv_scale in a native float32 value after weight loading.
self.quant_method = quant_method
self.quant_method.create_weights(self)
assert isinstance(quant_method, Fp8KVCacheMethod)
# TODO (mgoin): kv cache dtype should be specified in the FP8
# checkpoint config and become the "auto" behavior
if "fp8" in self.kv_cache_dtype:
if self.kv_cache_dtype == "fp8_e5m2":
raise ValueError("fp8_e5m2 kv-cache is not supported with "
"fp8 checkpoints.")
# When FP8 quantization is enabled, we make a parameter
# "kv_scale" so that it can be loaded from FP8 checkpoint.
# The kv_scale will then be converted back to self._kv_scale
# in a native float32 value after weight loading.
self.quant_method = quant_method
self.quant_method.create_weights(self)
# During model initialization, the default dtype is set as the model
# weight and activation dtype.