Thank you for your patience! Briefly, in actually, when we forward an image to a CNN model (on GPU), then I need to execute the torch.gesv(y,x) for 1000 times (on GPU too), where the size of x is 30*30. Then, the execution time in my actual task for once torch.gesv(y,x) is 0.009s or 5.6e-05?@albanD