what the infer mode is for？

[lzran]

the example for infer mode is fa，but when I use torch，it comes out the error File "/root/miniconda3/envs/HunyuanDiT/lib/python3.8/site-packages/accelerate/utils/operations.py", line 174, in send_to_device
raise error
File "/root/miniconda3/envs/HunyuanDiT/lib/python3.8/site-packages/accelerate/utils/operations.py", line 158, in send_to_device
return tensor.to(device, non_blocking=non_blocking)
NotImplementedError: Cannot copy out of meta tensor; no data!