fix device map

[winglian]

causes the device to be {'':'cuda:0'}. symptom is failure to train with this error:

ValueError: You can't train a model that has been loaded in 8-bit precision on a different device than the one you're training on. Make sure you loaded the model on the corr
ect device using for example `device_map={'':torch.cuda.current_device()}you're training on. Make sure you loaded the model on the correct device using for example `device_m
ap={'':torch.cuda.current_device() or device_map={'':torch.xpu.current_device()}