Question about cublas error runtime error

I don’t know the reason exactly, but the code run correctly before have runtime error now. By the error message, it seems the error occured when using torch.bmm function. The full error message is : RuntimeError: cublas runtime error : library not initialized at /home/ayu/pytorch/aten/src/THC/THCGeneral.cpp:266
Anyone have encountered this kind of problem? Can you give me some advice? Thank you.