app.py

import gradio as gr
import spaces
import torch

zero = torch.Tensor([0]).cuda()
print('zero device: ' + zero.device)

one = torch.ones(2, 2, device='cuda')
print('one device: ' + one.device)

@spaces.GPU
def greet(n):
    print('zero device' + zero.device)
    print('one device' + zero.device)
    return f"Hello {zero + n} Tensor"

gr.Interface(fn=greet, inputs=gr.Number(), outputs=gr.Text()).launch()