Faster-rcnn.pytorch: ImportError: cannot import name '_mask' from 'pycocotools'

[zhengxinvip]

ImportError: cannot import name '_mask' from 'pycocotools'
how can I fix it? thanks.

[kentaroy47]

a silly workaround is just commenting out

# import pycocotools._mask as _mask

from

lib/pycocotools/coco.py
lib/pycocotools/cocoeval.py
lib/datasets/coco.py
since this repo doesn't use masks..

[decoli]

a silly workaround is just commenting out

# import pycocotools._mask as _mask

from

lib/pycocotools/coco.py
lib/pycocotools/cocoeval.py
lib/datasets/coco.py
since this repo doesn't use masks..

So ... is this indeed a feasible and correct way to solve this problem?
And why there is the code import pycocotools._mask as _mask if it doesn't use masks?

[kentaroy47]

My take is that masks are used for instance segmentation tasks and not detection tasks. That's why you can simply comment out and still work frcnn😇

[decoli]

My take is that masks are used for instance segmentation tasks and not detection tasks. That's why you can simply comment out and still work frcnn😇

なるほど…僕の理解がずれてました…
ちなみにコメントアウトするべき
import pycocotools._mask as _maskが

lib/pycocotools/coco.py
lib/pycocotools/cocoeval.py
lib/datasets/coco.py

で見つからないです。
すみませんが何故でしょうか？

[loolzaaa]

You can install pycoctools with mask module compiled via conda or pip.

In other hand, you can compile _mask module from .pyx file with cython.

[kentaroy47]

@shirui-japina
pycocotools should be where you installed with pip or whatever.
you should modify the coco.py script.

Another good workaround is installing pycocotools properly.
Try:
pip install -U 'git+https://github.com/cocodataset/cocoapi.git#subdirectory=PythonAPI'

This should work for Linux.

[decoli]

You can install pycoctools with _mask_ module compiled via conda or pip.

In other hand, you can compile _mask module from .pyx file with cython.

Thanks for your comment.
I tried to
pip install pycocotools
but got error as below:

Microsoft Visual C++ 14.0 is required. Get it with "Build Tools for Visual Studio": https://visualstudio.microsoft.com/downloads/

So then I installed _Visual Studio_, but it doesn't work.
Do you know what I should do now？

[decoli]

@shirui-japina
pycocotools should be where you installed with pip or whatever.
you should modify the coco.py script.

Thanks for your comment.
I'll try to install pycocotools.