zwc163

## memory leak when using torch.cat result = torch.cat(td_list, dim=0)', ' File "/usr/local/lib/python3.10/dist-packages/tensordict/base.py", line 673', ' return TD_HANDLED_FUNCTIONS[func](*args, **kwargs)', ' File "/usr/local/lib/python3.10/dist-packages/tensordict/_torch_func.py", line 371', ' out[key] = torch.cat(items, dim)']... ##...