import bitsandbytes as bnb
import torch

p = torch.nn.Parameter(torch.rand(10, 10).cuda())
a = torch.rand(10, 10).cuda()

p1 = p.data.sum().item()

adam = bnb.optim.Adam([p])

out = a * p
loss = out.sum()
loss.backward()
adam.step()

p2 = p.data.sum().item()

assert p1 != p2
print('bnb: installed successfully!')