小拽

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what is the runtimeerror means, I 've already develop the sort_vertice

![屏幕截图 2023-03-30 135145](https://user-images.githubusercontent.com/66242942/228742166-9cd0520a-4e4c-4c3a-bf8c-8280a1fdb092.png)

I know that there are functions for tensor2tv in the cumm library, so how do I re-transform tv back into a tensor and keep its gradient?

I know that there are functions for tensor2tv in the cumm library, so how do I re-transform tv back into a tensor and keep its gradient?