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fix

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This commit is contained in:
OlivierDehaene 2023-07-18 12:36:27 +02:00
parent bc2f351980
commit d186b13c59
4 changed files with 38 additions and 29 deletions
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4
server/Makefile-flash-att-v2
View File

@ -1,4 +1,4 @@
flash_att_commit := 4f285b354796fb17df8636485b9a04df3ebbb7dc
flash_att_v2_commit := 4f285b354796fb17df8636485b9a04df3ebbb7dc
flash-attention-v2:
# Clone flash attention
@ -6,7 +6,7 @@ flash-attention-v2:
git clone https://github.com/HazyResearch/flash-attention.git flash-attention-v2
build-flash-attention-v2: flash-attention-v2
cd flash-attention-v2 && git fetch && git checkout $(flash_att_commit)
cd flash-attention-v2 && git fetch && git checkout $(flash_att_v2_commit)
cd flash-attention-v2 && python setup.py build
install-flash-attention-v2: build-flash-attention-v2

6
server/text_generation_server/models/__init__.py
View File

@ -55,10 +55,8 @@ try:
FlashSantacoderSharded,
)
except ImportError:
logger.opt(exception=True).warning(
"Could not import Flash Attention enabled models"
)
except ImportError as e:
logger.warning(f"Could not import Flash Attention enabled models: {e}")
FLASH_ATTENTION = False
if FLASH_ATTENTION:

4
server/text_generation_server/models/custom_modeling/flash_rw_modeling.py
View File

@ -188,7 +188,7 @@ class FlashRWAttention(torch.nn.Module):
attn_output,
cu_seqlen_prefill,
max_s,
self.softmax_scale
self.softmax_scale,
)
# Decode
else:
@ -308,7 +308,7 @@ class FlashRWLargeAttention(torch.nn.Module):
attn_output,
cu_seqlen_prefill,
max_s,
self.softmax_scale
self.softmax_scale,
)
# Decode
else:

27
server/text_generation_server/utils/flash_attn.py
View File

@ -1,6 +1,8 @@
import os
import torch
from loguru import logger
if os.getenv("USE_FLASH_ATTENTION", "").lower() == "false":
raise ImportError("`USE_FLASH_ATTENTION` is false.")
@ -18,7 +20,8 @@ try:
try:
import flash_attn_2_cuda
except ImportError:
raise ImportError("Flash Attention V2 is not installed.\n"
raise ImportError(
"Flash Attention V2 is not installed.\n"
"Use the official Docker image (ghcr.io/huggingface/text-generation-inference:latest) "
"or install flash attention v2 with `cd server && make install install-flash-attention-v2`"
)
@ -32,7 +35,8 @@ except ImportError as e:
try:
import flash_attn_cuda
except ImportError:
raise ImportError("Flash Attention is not installed.\n"
raise ImportError(
"Flash Attention is not installed.\n"
"Use the official Docker image (ghcr.io/huggingface/text-generation-inference:latest) "
"or install flash attention with `cd server && make install install-flash-attention`"
) from e
@ -41,6 +45,7 @@ except ImportError as e:
raise ImportError(
f"GPU with CUDA capability {major} {minor} is not supported"
) from e
logger.warning(f"Unable to use Flash Attention V2: {e}")
HAS_FLASH_ATTN = True
@ -76,21 +81,27 @@ def attention(
if k.shape[1] != q.shape[1]:
# MQA expand
if k.shape[1] == 1:
k = k.expand(-1, q.shape[1], -1, -1)
k = k.expand(-1, q.shape[1], -1)
# Grouped attention reshape
else:
original_shape = k.shape
k = k.unsqueeze(2).expand(-1, -1, q.shape[1], -1, -1) \
.reshape(original_shape[0], -1, original_shape[1], original_shape[2])
k = (
k.unsqueeze(2)
.expand(-1, -1, q.shape[1] // k.shape[1], -1)
.reshape(original_shape[0], -1, original_shape[2])
)
if v.shape[1] != q.shape[1]:
# MQA expand
if v.shape[1] == 1:
v = v.expand(-1, q.shape[1], -1, -1)
v = v.expand(-1, q.shape[1], -1)
# Grouped attention reshape
else:
original_shape = v.shape
v = v.unsqueeze(2).expand(-1, -1, q.shape[1], -1, -1) \
.reshape(original_shape[0], -1, original_shape[1], original_shape[2])
v = (
v.unsqueeze(2)
.expand(-1, -1, q.shape[1] // v.shape[1], -1)
.reshape(original_shape[0], -1, original_shape[2])
)
return flash_attn_cuda.fwd(
q,