from typing import Optional, Union
import torch


def clean_memory_on_device(device: Optional[Union[str, torch.device]]):
    if device is None:
        return
    if isinstance(device, str):
        device = torch.device(device)
    if device.type == "cuda":
        torch.cuda.empty_cache()
    elif device.type == "cpu":
        pass
    elif device.type == "mps":  # not tested
        torch.mps.empty_cache()


def synchronize_device(device: Optional[Union[str, torch.device]]):
    if device is None:
        return
    if isinstance(device, str):
        device = torch.device(device)
    if device.type == "cuda":
        torch.cuda.synchronize()
    elif device.type == "xpu":
        torch.xpu.synchronize()
    elif device.type == "mps":
        torch.mps.synchronize()