Return Value Error

[aiyb1314]

File "/home/xuj/pointnerf/models/MvsPointsVolumetricModel.py", line 104, in backward
self.loss_total.backward()
File "/home/xuj/pointnerf/models/NeuralPointsVolumetricModel.py", line 212, in optimize_parameters
self.backward(total_steps)
File "/home/xuj/pointnerf/runner/train_ft.py", line 364, in main
model.optimize_parameters(total_steps=total_steps)
File "/home/xuj/pointnerf/runner/train_ft.py", line 465, in
main()
RuntimeError: Function 'MulBackward0' returned nan values in its 1th output.