ModuleNotFoundError: No module named 'mmcv._ext' #204

Liyw979 · 2020-03-02T07:58:00Z

I clone the repo and run pip install.

When I run test_image.py, this error shows up.

mmcv/mmcv/video/optflow.py

Line 4 in 120c6a6

from mmcv._ext import flow_warp_c

xjock · 2020-03-20T09:37:43Z

Just cd ..

DuinoDu · 2020-07-12T13:18:15Z

Any update?

DuinoDu · 2020-07-12T13:22:30Z

Build mmcv with MMCV_WITH_OPS=1 may help.

lui-shex · 2020-07-12T14:13:50Z

what you mean MMCV_WITH_OPS=1? I can't run MMCV_WITH_OPS=1 pip install -e .

NikZak · 2020-07-20T07:38:18Z

Workaround:
pip uninstall mmcv mmcv-full
git clone https://github.com/open-mmlab/mmcv.git
cd mmcv
MMCV_WITH_OPS=1 pip install -e .

sailfish009 · 2020-07-23T22:02:20Z

Workaround:
pip uninstall mmcv mmcv-full
git clone https://github.com/open-mmlab/mmcv.git
cd mmcv
MMCV_WITH_OPS=1 pip install -e .

Thanks! works for me.

guofuxin · 2020-07-28T01:57:07Z

what you mean MMCV_WITH_OPS=1? I can't run MMCV_WITH_OPS=1 pip install -e .

I also can't run it.Are you deal with it?

guofuxin · 2020-07-28T02:00:39Z

MMCV_WITH_OPS=1 pip install -e

I can't run MMCV_WITH_OPS=1 pip install -e,
the terminal is " -e option requires 1 argument"，
can you help me ? thank you very much

NikZak · 2020-07-28T03:14:05Z

You should not forget the dot in the end ".". Which just means installing from current directory.
It is not
MMCV_WITH_OPS=1 pip install -e
It is
MMCV_WITH_OPS=1 pip install -e .

liuligang123 · 2020-08-05T08:49:01Z

I run the MMCV_WITH_OPS=1 pip install -e . and then solve the problem
just wait when running setup.py develop for mmcv-full

Never-up · 2020-09-18T07:01:22Z

I run the MMCV_WITH_OPS=1 pip install -e . and then solve the problem
just wait when running setup.py develop for mmcv-full

请问你解决了吗，我也遇到了

VoldemortGin · 2020-09-26T02:55:06Z

I run the MMCV_WITH_OPS=1 pip install -e . and then solve the problem

That didn't work for me. And my mmcv version is 1.1.3. Still, I got ModuleNotFoundError: No module named 'mmcv._ext' Error when I tried to run a demo.

Any solution? My log is as below:

python demo/image_demo.py demo/demo.jpg configs/mask_rcnn/mask_rcnn_x101_64x4d_fpn_1x_coco.py 

checkpoints/mask_rcnn_x101_64x4d_fpn_1x_coco_20200201-9352eb0d.pth 
Traceback (most recent call last):
  File "demo/image_demo.py", line 3, in <module>
    from mmdet.apis import inference_detector, init_detector, show_result_pyplot
  File "/home/linhan/workspace/mmcv/mmdetection/mmdet/apis/__init__.py", line 1, in <module>
    from .inference import (async_inference_detector, inference_detector,
  File "/home/linhan/workspace/mmcv/mmdetection/mmdet/apis/inference.py", line 7, in <module>
    from mmcv.ops import RoIAlign, RoIPool
  File "/home/linhan/anaconda3/lib/python3.7/site-packages/mmcv-1.1.3-py3.7-linux-x86_64.egg/mmcv/ops/__init__.py", line 1, in <module>
    from .bbox import bbox_overlaps
  File "/home/linhan/anaconda3/lib/python3.7/site-packages/mmcv-1.1.3-py3.7-linux-x86_64.egg/mmcv/ops/bbox.py", line 3, in <module>
    ext_module = ext_loader.load_ext('_ext', ['bbox_overlaps'])
  File "/home/linhan/anaconda3/lib/python3.7/site-packages/mmcv-1.1.3-py3.7-linux-x86_64.egg/mmcv/utils/ext_loader.py", line 11, in load_ext
    ext = importlib.import_module('mmcv.' + name)
  File "/home/linhan/anaconda3/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named 'mmcv._ext'

Thank you in advance.

neomukul · 2020-11-17T06:06:08Z

@VoldemortGin are you able to resolve this issue, I am also having the same issue.
if i Install mmcv-full it is not working as mmcv-1.2 version is not compatible with mmdet and if i install mmcv-1.1.3 it throws error "ModuleNotFoundError: No module named 'mmcv._ext'"?

surendrallam · 2021-01-19T07:11:13Z

Workaround:
pip uninstall mmcv mmcv-full
git clone https://github.com/open-mmlab/mmcv.git
cd mmcv
MMCV_WITH_OPS=1 pip install -e .

This worked for me... Thanks a ton @NikZak

korhun · 2021-02-03T14:21:58Z

For windows, this worked for me:

pip uninstall mmcv
pip uninstall mmcv-full
git clone https://github.com/open-mmlab/mmcv.git
cd mmcv
set MMCV_WITH_OPS=1
pip install -e .

surendrallam · 2021-02-03T15:33:00Z

This will work in RISC-V, I installed it on SiFive Unleashed board, it worked for me. pip uninstall mmcv pip uninstall mmcv-full git clone https://github.com/open-mmlab/mmcv.git cd mmcv set MMCV_WITH_OPS=1 pip install -e . Thanks and Regards, Surendra Allam, Senior Software Engineer, Exaleap Semiconductors, Bangalore, India.

…

Sent from my iPhone On 03-Feb-2021, at 7:52 PM, Koray Orhun <notifications@github.com> wrote: For windows, this worked for me: pip uninstall mmcv pip uninstall mmcv-full git clone https://github.com/open-mmlab/mmcv.git cd mmcv set MMCV_WITH_OPS=1 pip install -e . — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#204 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AK63YVK7VSOHVO7SFTNWZNTS5FLZRANCNFSM4K7ORCXQ>.

SamMohel · 2021-03-15T13:06:41Z

I run the MMCV_WITH_OPS=1 pip install -e . and then solve the problem

That didn't work for me. And my mmcv version is 1.1.3. Still, I got ModuleNotFoundError: No module named 'mmcv._ext' Error when I tried to run a demo.

Any solution? My log is as below:

python demo/image_demo.py demo/demo.jpg configs/mask_rcnn/mask_rcnn_x101_64x4d_fpn_1x_coco.py 

checkpoints/mask_rcnn_x101_64x4d_fpn_1x_coco_20200201-9352eb0d.pth 
Traceback (most recent call last):
  File "demo/image_demo.py", line 3, in <module>
    from mmdet.apis import inference_detector, init_detector, show_result_pyplot
  File "/home/linhan/workspace/mmcv/mmdetection/mmdet/apis/__init__.py", line 1, in <module>
    from .inference import (async_inference_detector, inference_detector,
  File "/home/linhan/workspace/mmcv/mmdetection/mmdet/apis/inference.py", line 7, in <module>
    from mmcv.ops import RoIAlign, RoIPool
  File "/home/linhan/anaconda3/lib/python3.7/site-packages/mmcv-1.1.3-py3.7-linux-x86_64.egg/mmcv/ops/__init__.py", line 1, in <module>
    from .bbox import bbox_overlaps
  File "/home/linhan/anaconda3/lib/python3.7/site-packages/mmcv-1.1.3-py3.7-linux-x86_64.egg/mmcv/ops/bbox.py", line 3, in <module>
    ext_module = ext_loader.load_ext('_ext', ['bbox_overlaps'])
  File "/home/linhan/anaconda3/lib/python3.7/site-packages/mmcv-1.1.3-py3.7-linux-x86_64.egg/mmcv/utils/ext_loader.py", line 11, in load_ext
    ext = importlib.import_module('mmcv.' + name)
  File "/home/linhan/anaconda3/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named 'mmcv._ext'

Thank you in advance.

did you solve it ?

TheFebrin · 2021-04-10T14:07:18Z

For people still struggling with this error: ModuleNotFoundError: No module named 'mmcv._ext'

It's important that pytorch - cuda - mmcv are compatible
Therefore first you should check your cuda version nvidia-smi

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 450.102.04   Driver Version: 450.102.04   CUDA Version: 11.0     |
|-------------------------------+----------------------+----------------------+

For example mine is 11.0

Then download correct pytorch:

pip install torch==1.8.0+cu111 torchvision==0.9.0+cu111 torchaudio==0.8.0 -f https://download.pytorch.org/whl/torch_stable.html

This is Pytorch 1.8.0 with cuda 11.1.

Install correct mmcv as they mention in their README

pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/cu111/torch1.8.0/index.html

/cu111/torch1.8.0/ see how cuda and torch versions are matching

It should work 😃

Python 3.7.5 (default, Feb 23 2021, 13:22:40) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from mmcv.ops import get_compiling_cuda_version, get_compiler_version
>>> print(get_compiling_cuda_version())
11.1
>>> print(get_compiler_version())
GCC 7.3
>>>

PS Here's our project where we used mmdet

THEBEST-cloud · 2021-04-19T11:41:25Z

what you mean MMCV_WITH_OPS=1? I can't run MMCV_WITH_OPS=1 pip install -e .

I also can't run it.Are you deal wi

I run the MMCV_WITH_OPS=1 pip install -e . and then solve the problem
just wait when running setup.py develop for mmcv-full

请问你解决了吗，我也遇到了

请问怎么解决的啊 MMCV_WITH_OPS=1 pip install -e .这个命令执行报错 'MMCV_WITH_OPS' 不是内部或外部命令，也不是可运行的程序

xhjiang1998 · 2021-06-02T13:04:38Z

For windows, this worked for me:

pip uninstall mmcv
pip uninstall mmcv-full
git clone https://github.com/open-mmlab/mmcv.git
cd mmcv
set MMCV_WITH_OPS=1
pip install -e .

this is the accuracy

jankrans · 2022-02-15T21:07:15Z

For windows, this worked for me:
pip uninstall mmcv
pip uninstall mmcv-full
git clone https://github.com/open-mmlab/mmcv.git
cd mmcv
set MMCV_WITH_OPS=1
pip install -e .

Still getting the error mentioned in the title when trying this on windows conda environment.
cudatoolkit=11.3.1
mmcv=1.4.5
mmdet=2.21.0
python=3.7.11
torchvision=0.11.3

Would also rather have the mmdet-full. Been struggling for a long time with all these versions. Someone with a working windows version that could provide quick explanation?

Lucifer60 · 2022-05-16T04:03:52Z

I am really appreciate that after stuggling one day on "No module named 'mmcv._ext'" problem that after uninstall mmcv-full and uninstall mmcv .I can't pip install -e. So I use your method "pip install mmcv-full -f https://download.openmmlab.com/mmcv/dist/cu111/torch1.8.0/index.html" And it work well now.

EgShes · 2024-03-27T06:59:27Z

For me helped

Install right version of torch for your cuda. Get command from here
pip install torch==2.0.0 torchvision==0.15.1 torchaudio==2.0.1 --index-url https://download.pytorch.org/whl/cu118
Install right mmcv for your torch. Get command from here
pip install mmcv==2.0.1 -f https://download.openmmlab.com/mmcv/dist/cu118/torch2.0/index.html

rhelck · 2024-06-11T19:56:58Z

Have the same issue, the approaches listed here do not work for me

This is the only thing preventing me from using your model, could you guys either simplify the installation process or provide more reliable instructions for installing the model?

I don't mean to come across as impatient, but I was excited to use your model after seeing your object detection benchmark results, and this issue looks like its been around for a while

hutIngk · 2024-06-26T08:55:35Z

Workaround: pip uninstall mmcv mmcv-full git clone https://github.com/open-mmlab/mmcv.git cd mmcv MMCV_WITH_OPS=1 pip install -e .

sry, i have tried your method, but it is seems to work failed in Windows，it reports MMCV_WITH_OPS is not a inner or out command, so are u guys who said to slove this problem all work on linux or other else ?

Moyago · 2024-10-28T07:40:20Z

For me helped

1. Install right version of torch for your cuda. Get command from [here](https://pytorch.org/get-started/previous-versions/)
   `pip install torch==2.0.0 torchvision==0.15.1 torchaudio==2.0.1 --index-url https://download.pytorch.org/whl/cu118`

2. Install right mmcv for your torch. Get command from [here](https://mmcv.readthedocs.io/en/latest/get_started/installation.html#install-with-pip)
   `pip install mmcv==2.0.1 -f https://download.openmmlab.com/mmcv/dist/cu118/torch2.0/index.html`

this reply definitely solved my problem, thanks sir! @EgShes

hellock closed this as completed May 3, 2020

ycxioooong mentioned this issue Jan 25, 2021

win10 ModuleNotFoundError: No module named 'mmcv._ext' #788

Closed

daeunni mentioned this issue May 18, 2023

Installation of mmcv>=[1, 1, 4], <=[1, 3, 0] while using Segmentation codes qinenergy/cotta#22

Closed

jfitzg7 mentioned this issue Sep 13, 2023

Running into problems with mmcv==1.3.18 YangHai-1218/RADet#6

Closed

R4Ajeti mentioned this issue May 14, 2024

[Bug] mmocr not working on mac anymore (MacBook M3 chip) open-mmlab/mmocr#2045

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ModuleNotFoundError: No module named 'mmcv._ext' #204

ModuleNotFoundError: No module named 'mmcv._ext' #204

Liyw979 commented Mar 2, 2020

xjock commented Mar 20, 2020

DuinoDu commented Jul 12, 2020

DuinoDu commented Jul 12, 2020

lui-shex commented Jul 12, 2020

NikZak commented Jul 20, 2020

sailfish009 commented Jul 23, 2020

guofuxin commented Jul 28, 2020

guofuxin commented Jul 28, 2020

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liuligang123 commented Aug 5, 2020

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VoldemortGin commented Sep 26, 2020

neomukul commented Nov 17, 2020

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korhun commented Feb 3, 2021

surendrallam commented Feb 3, 2021 via email

SamMohel commented Mar 15, 2021

TheFebrin commented Apr 10, 2021

THEBEST-cloud commented Apr 19, 2021

xhjiang1998 commented Jun 2, 2021

jankrans commented Feb 15, 2022

Lucifer60 commented May 16, 2022

EgShes commented Mar 27, 2024

rhelck commented Jun 11, 2024

hutIngk commented Jun 26, 2024

Moyago commented Oct 28, 2024

ModuleNotFoundError: No module named 'mmcv._ext' #204

ModuleNotFoundError: No module named 'mmcv._ext' #204

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