[🐛 bug report] invert_cbox_torch.py example results in Segmentation fault with pytorchV1.6 but not V1.4

[hakanyi]

Summary

The title says it all :) Running on NVIDIA GeForce RTX 2080 Ti. Happy to help debug this - thanks!

System configuration

• Platform: Ubuntu 18.04
• Compiler: Clang-9
• Python version: 3.6.9
• Mitsuba 2 version: 2.1.0 pathreparam-optix7 branch
• Compiled variants:
  • scalar_rgb
  • gpu_autodiff_rgb

Steps to reproduce

1. Run example with Pytorch 1.4.0 installed and observe the optimization running smoothly
2. Run example with Pytorch 1.6.0 installed and observe a Segmentation fault

[Speierers]

Hi @hakanyi ,

This will most likely be fixed in the upcoming release of Mitsuba 2.

[kopetri]

Hi @hakanyi , This is an unix related issue since running invert_cbox_torch.py using torch1.7.1 and torch1.9.0 under windows works for me.