I installed flash attention from source, but it is not detected by ComfyUI:
To use the `--use-flash-attention` feature, the `flash-attn` package must be installed first.
command:
J:\ComfyUI\ComfyUI_windows_portable\python_embeded\python.exe -m pip install flash-attn
J:\ComfyUI\ComfyUI_windows_portable\python_embeded>python -m pip list
Package Version
---------------------------------------- ----------------------
accelerate 1.12.0
addict 2.4.0
aiofiles 24.1.0
aiohappyeyeballs 2.6.1
aiohttp 3.13.3
aiohttp_socks 0.11.0
aiosignal 1.4.0
albucore 0.0.24
albumentations 2.0.8
alembic 1.18.1
annotated-types 0.7.0
antlr4-python3-runtime 4.9.3
anyio 4.12.1
argcomplete 3.6.3
attrs 25.4.0
audioread 3.1.0
Authlib 1.6.6
av 16.1.0
beartype 0.22.9
beautifulsoup4 4.14.3
black 26.1.0
boto3 1.42.39
botocore 1.42.39
cachetools 7.0.0
certifi 2026.1.4
cffi 2.0.0
chardet 5.2.0
charset-normalizer 3.4.4
click 8.3.1
clip-interrogator 0.6.0
cloudpickle 3.1.2
codegen 0.57.0
codegen-api-client 1.0.0
codeowners 0.8.0
color-matcher 0.6.0
colorama 0.4.6
coloredlogs 15.0.1
colorlog 6.10.1
comfy-aimdo 0.1.6
comfy-kitchen 0.2.7
comfyui-embedded-docs 0.4.0
comfyui_frontend_package 1.37.11
comfyui_workflow_templates 0.8.27
comfyui-workflow-templates-core 0.3.115
comfyui-workflow-templates-media-api 0.3.47
comfyui-workflow-templates-media-image 0.3.75
comfyui-workflow-templates-media-other 0.3.98
comfyui-workflow-templates-media-video 0.3.42
contourpy 1.3.3
cryptography 46.0.4
cycler 0.12.1
cyclopts 4.5.1
datamodel-code-generator 0.53.0
ddt 1.7.2
decorator 4.4.2
decord 0.6.0
Deprecated 1.3.1
diffusers 0.36.0
diskcache 5.6.3
distro 1.9.0
dnspython 2.8.0
docstring_parser 0.17.0
docutils 0.22.4
easydict 1.13
einops 0.8.2
email-validator 2.3.0
exceptiongroup 1.3.1
fakeredis 2.33.0
fal_client 0.12.0
fastmcp 2.14.4
filelock 3.20.3
flash_attn 2.8.3
flatbuffers 25.12.19
fonttools 4.61.1
frozenlist 1.8.0
fsspec 2026.1.0
ftfy 6.3.1
gdown 5.2.1
genson 1.3.0
gitdb 4.0.12
GitPython 3.1.44
giturlparse 0.14.0
glfw 2.10.0
glitch_this 1.0.3
google-api-core 2.29.0
google-auth 2.48.0
google-cloud-core 2.5.0
google-cloud-storage 3.8.0
google-crc32c 1.8.0
google-genai 1.61.0
google-resumable-media 2.8.0
googleapis-common-protos 1.72.0
greenlet 3.3.1
groundingdino-py 0.4.0
grpcio 1.76.0
h11 0.16.0
h2 4.3.0
hatch-vcs 0.5.0
hatchling 1.28.0
hf-xet 1.2.0
hpack 4.1.0
httpcore 1.0.9
httpx 0.28.1
httpx-sse 0.4.3
huggingface_hub 1.3.4
humanfriendly 10.0
humanize 4.15.0
hydra-core 1.3.2
hyperframe 6.1.0
idna 3.11
ImageIO 2.37.2
imageio-ffmpeg 0.6.0
importlib_metadata 8.7.1
inflect 7.5.0
iopath 0.1.10
isort 7.0.0
jaraco.classes 3.4.0
jaraco.context 6.1.0
jaraco.functools 4.4.0
Jinja2 3.1.6
jiter 0.12.0
jmespath 1.1.0
joblib 1.5.3
jsonref 1.1.0
jsonschema 4.26.0
jsonschema-path 0.3.4
jsonschema-specifications 2025.9.1
keyring 25.7.0
kiwisolver 1.4.9
kornia 0.8.2
kornia_rs 0.1.10
lark 1.3.1
lazy_loader 0.4
librosa 0.11.0
linkify-it-py 2.0.3
llvmlite 0.46.0
lupa 2.6
Mako 1.3.10
markdown-it-py 4.0.0
MarkupSafe 3.0.3
matplotlib 3.10.8
matrix-nio 0.25.2
mcp 1.26.0
mdit-py-plugins 0.5.0
mdurl 0.1.2
more-itertools 10.8.0
moviepy 1.0.3
mpmath 1.3.0
msgpack 1.1.2
mss 10.1.0
multidict 6.7.1
mypy_extensions 1.1.0
networkx 3.6.1
ninja 1.11.1.4
numba 0.63.1
numpy 2.3.5
ollama 0.6.1
omegaconf 2.3.0
onnxruntime 1.23.2
onnxruntime-gpu 1.23.2
open_clip_torch 3.2.0
openai 2.16.0
openapi-pydantic 0.5.1
opencv-python 4.13.0.90
opencv-python-headless 4.13.0.90
opentelemetry-api 1.39.1
opentelemetry-exporter-otlp 1.39.1
opentelemetry-exporter-otlp-proto-common 1.39.1
opentelemetry-exporter-otlp-proto-grpc 1.39.1
opentelemetry-exporter-otlp-proto-http 1.39.1
opentelemetry-exporter-prometheus 0.60b1
opentelemetry-instrumentation 0.60b1
opentelemetry-proto 1.39.1
opentelemetry-sdk 1.39.1
opentelemetry-semantic-conventions 0.60b1
packaging 26.0
pathable 0.4.4
pathspec 1.0.4
pathvalidate 3.3.1
pdf2image 1.17.0
peft 0.18.1
pillow 12.1.0
pip 25.3
platformdirs 4.5.1
pluggy 1.6.0
pooch 1.9.0
portalocker 3.2.0
proglog 0.1.12
prometheus_client 0.24.1
propcache 0.4.1
proto-plus 1.27.0
protobuf 6.33.5
psutil 7.2.1
py-key-value-aio 0.3.0
py-key-value-shared 0.3.0
pyasn1 0.6.2
pyasn1_modules 0.4.2
pycocotools 2.0.11
pycparser 3.0
pycryptodome 3.23.0
pydantic 2.12.5
pydantic_core 2.41.5
pydantic-settings 2.12.0
pydocket 0.16.6
pygit2 1.19.1
PyGithub 2.6.1
Pygments 2.19.2
PyJWT 2.11.0
PyMatting 1.1.15
PyMuPDF 1.26.7
PyNaCl 1.6.2
PyOpenGL 3.1.10
PyOpenGL-accelerate 3.1.10
pyparsing 3.3.2
PyPDF2 3.0.1
pyperclip 1.11.0
pyreadline3 3.5.4
PySocks 1.7.1
python-dateutil 2.9.0.post0
python-dotenv 1.2.1
python-json-logger 4.0.0
python-multipart 0.0.22
python-socks 2.8.0
pytokens 0.4.1
pywin32 311
pywin32-ctypes 0.2.3
PyYAML 6.0.3
redis 7.1.0
referencing 0.36.2
regex 2026.1.15
reportlab 4.4.9
requests 2.32.5
rich 14.3.1
rich-rst 1.3.2
rocm 7.2.0.dev0
rocm-sdk-core 7.2.0.dev0
rocm-sdk-libraries-custom 7.2.0.dev0
rpds-py 0.30.0
rsa 4.9.1
runwayml 4.3.0
s3transfer 0.16.0
safetensors 0.7.0
sageattention 1.0.6
scikit-learn 1.8.0
scipy 1.17.0
segment-anything 1.0
sentencepiece 0.2.1
sentry-sdk 2.29.1
setuptools 80.10.2
setuptools-scm 9.2.2
shellingham 1.5.4
simsimd 6.5.12
six 1.17.0
smmap 5.0.2
sniffio 1.3.1
sortedcontainers 2.4.0
sounddevice 0.5.5
soundfile 0.13.1
soupsieve 2.8.3
soxr 1.0.0
spandrel 0.4.1
SQLAlchemy 2.0.46
sse-starlette 3.2.0
starlette 0.52.1
stringzilla 4.6.0
supervision 0.6.0
sympy 1.14.0
tenacity 9.1.2
textual 7.5.0
threadpoolctl 3.6.0
timm 1.0.24
tokenizers 0.22.2
toml 0.10.2
torch 2.9.1+rocmsdk20260116
torchaudio 2.9.1+rocmsdk20260116
torchsde 0.2.6
torchvision 0.24.1+rocmsdk20260116
tqdm 4.67.1
trampoline 0.1.2
transformers 5.0.0
transparent-background 1.3.4
triton-windows 3.6.0.post25
trove-classifiers 2026.1.14.14
typeguard 4.4.4
typer 0.21.1
typer-slim 0.21.1
typing_extensions 4.15.0
typing-inspection 0.4.2
uc-micro-py 1.0.3
unidiff 0.7.5
unpaddedbase64 2.1.0
urllib3 2.6.3
uv 0.9.28
uvicorn 0.40.0
wcwidth 0.5.3
websockets 15.0.1
wget 3.2
wrapt 1.17.3
yapf 0.43.0
yarl 1.22.0
zipp 3.23.0
I installed flash attention from source, but it is not detected by ComfyUI: