Several Issues Encountered During Model Training

[AlvinYH]

Thank you for publicly releasing your code! However, I encountered several problems while training the model:

1. At https://github.com/czh-98/STAR/blob/master/lib/dlmesh.py#L909, it appears that mask and dense face are not on the same device. I resolved this by moving the mask to the GPU.
2. At https://github.com/czh-98/STAR/blob/master/lib/trainer.py#L691, modifying the retarget_pose attribute in the trainer class does not seem to alter its value. This causes a bug at https://github.com/czh-98/STAR/blob/master/lib/dlmesh.py#L874 because retarget_pose remains None. I'm unsure of the underlying reason, but I fixed this by encapsulating the function that sets retarget_pose within the dlmesh class.
3. I couldn't locate data/FLAME_masks/FLAME.obj after downloading the FLAME Vertex Masks and FLAME Mediapipe Landmark files as described in the README. Could you provide specific instructions on how to obtain this file?

Thank you!

[czh-98]

Hi, thanks for your attention.

• For 1, I checked the device, and it does in different devices. Although it still works on my own server, I have fixed it.
• For 2, I run the code on my server. The training script does not raise errors and will update the pose, I do not know the reasons...😂
• For 1 and 2, I think it might be because you have a multi-GPU server, while I only tested on a single GPU server, so I would suggest running the script with CUDA_VISIBLE_DEVICES=0 python xxx.
• For 3, I just uploaded the FLAME.obj file for convenience.

Let me know if you have any other questions :)

[Jackiemin233]

@AlvinYH For question 2, I think you may use the torch 2.0+. I have debugged the code, and find out the solution. That's because on the Line 111-113 in train.py, the self. model is compiled by torch and transferred from DLMesh to an Optimized model and cannot read initialized retarget_pose sequence. I delete these three lines and it works for me. : )

[AlvinYH]

@czh-98 Thanks for your reply! As @Jackiemin233 mentioned, I did use torch 2.0+, and deleting lines 111-113 fixed the bug. Thank you both! However, when using torch 2.0+, I encountered an inplace operation error: RuntimeError: one of the variables needed for gradient computation has been modified by an in-place operation: [torch.cuda.FloatTensor [25193]], which is output 0 of LinalgVectorNormBackward0, is at version 1; expected version 0 instead. This error traces back to line 161 in lib/guidance/shape_reg.py during the computation of the Laplacian smoothness loss. I have since downgraded to torch 1.12 and resumed training. But I'm curious about the cause of this bug and if there is a solution other than downgrading the torch version.

[czh-98]

@czh-98 Thanks for your reply! As @Jackiemin233 mentioned, I did use torch 2.0+, and deleting lines 111-113 fixed the bug. Thank you both! However, when using torch 2.0+, I encountered an inplace operation error: RuntimeError: one of the variables needed for gradient computation has been modified by an in-place operation: [torch.cuda.FloatTensor [25193]], which is output 0 of LinalgVectorNormBackward0, is at version 1; expected version 0 instead. This error traces back to line 161 in lib/guidance/shape_reg.py during the computation of the Laplacian smoothness loss. I have since downgraded to torch 1.12 and resumed training. But I'm curious about the cause of this bug and if there is a solution other than downgrading the torch version.

I tried torch 2.0+ and noticed this issue is due to the inplace operation loss[get_flame_vertex_idx()] *= 5. I modified it to avoid such operations as a+=b to a=a+b. Then it should also work for torch 2.0+.