Tag Archives: cv

[Solved] Android Studio Error: Use of undeclared identifier ‘cv‘

Problem description

This error occurs when I use the opencv3.4.16 official so file in Android studio

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Change the build.gradle file

Change arguments “- dandroid_stl = C + + _shared”
to arguments “- dandroid_stl = gnustl_shared”

Possible causes:

Opencv3.4.16 officially uses the gun compiler, so it is specified as gnustl_shared

mmdetection Error when running voc.py: KeyError: ‘NumClassCheckHook is already registered in hook‘

This error is usually caused by the version of mmcv
just click in one by one according to the following error prompt to find utils.py file:
change the code in the circle below:

add in brackets:

finally, it can run successfully.

Similar questions:
keyerror: ‘XXX is already registered in xxx’

Results: it runs perfectly