查看电脑torch能否使用GPU

import torch
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

print(device) #cpu

import torch
flag = torch.cuda.is_available()
print(flag)

ngpu= 1
# Decide which device we want to run on
device = torch.device("cuda:0" if (torch.cuda.is_available() and ngpu > 0) else "cpu")
print(device)
print(torch.cuda.get_device_name(0))
print(torch.rand(3,3).cuda())

True
cuda:0
NVIDIA GeForce GTX 1650
tensor([[0.6134, 0.0682, 0.9818],
        [0.2449, 0.2887, 0.8753],
        [0.8587, 0.6035, 0.9593]], device='cuda:0')