UserWarning: cannot import name '_C' from 'sam2'

[laisimiao]

/home/xxx/PycharmProjects/samurai/sam2/sam2/sam2_video_predictor.py:961: UserWarning: cannot import name '_C' from 'sam2' (/home/xxx/PycharmProjects/samurai/sam2/sam2/__init__.py)

Skipping the post-processing step due to the error above. You can still use SAM 2 and it's OK to ignore the error above, although some post-processing functionality may be limited (which doesn't affect the results in most cases; see https://github.com/facebookresearch/sam2/blob/main/INSTALL.md).

What operations are included in the post-processing process? Why we can ignore the error above?

[zhyjiang]

This is an error in the original SAM2 lib. You may check this issue: facebookresearch/sam2#25

[havinggood]

这是原始 SAM2 库中的错误。你可以检查这个问题： facebookresearch/sam2#25

I'm having the same problem with my torch is 2.3.1，cuda12.1，Run the solution in issue25：python setup.py build_ext --inplace Report an error：
CUDA_HOME environment variable is not set. Please set it to your CUDA install root.

Failed to build the SAM 2 CUDA extension due to the error above. You can still use SAM 2 and it's OK to ignore the error above, although some post-processing functionality may be limited (which doesn't affect the results in most cases; (see https://github.com/facebookresearch/sam2/blob/main/INSTALL.md).

[yangchris11]

@havinggood Our code base did not modify any cuda-related code nor require any further version of torch. We recommend you to first set-up the original SAM 2 environment and run a quick test to ensure the enviroment is set up correctly.