How to set Multiple GPU's instead of cuda=0 or cuda=1

[ChandanaJonna]

I am training DPCRN with my data. I have 2 GPU's (GPU 0, GPU 1). But with args configuration I am able to choose either CUDA 0 or CUDA 1. With single GPU, my training speed to very slow. I would like to use both GPU's. How to set more than 1 GPU for parallel processing.

Kindly share your comments. Thanks in advance.