我只有一个 GPU,当我运行 train_refine.py 时,出现错误: RuntimeError: 分布式包中没有内置 NCCL

D:\software\Anaconda3\envs\bg_matting\Python.exe "D:\software\JetBrains\PyCharm 2022.1.3\plugins\Python\helpers\pydev\pydevd.py" --multiprocess --qt-support=auto --client 127.0.0.1 --port 12569 --file D:/_zzw_work/gouged/py_project/BackgroundMattingV2/train_refine_ori.py --dataset-name videomatte240k --model-backbone resnet101 --model-name refine_resnet101 --model-last-checkpoint D:\_zzw_work\gouged\py_project\BackgroundMattingV2\weights\torchscript_resnet101_fp32.pth --epoch-end 2000 已连接到 pydev 调试器(内部版本号 221.5921.27)Traceback (most recent call last): File "D:\software\JetBrains\PyCharm 2022.1.3\plugins\Python\helpers\pydev\pydevd.py", line 1491, in _exec pydev_imports.execfile(file, globals, locals) # execute the script File "D:\software\JetBrains\PyCharm 2022.1.3\plugins\Python\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile exec(compile(contents+"\n", file, 'exec'), glob, loc) File "D:/_zzw_work/gouged/py_project/BackgroundMattingV2/train_refine_ori.py", line 312, in <module> mp.spawn(train_worker, File "D:\software\Anaconda3\envs\bg_matting\lib\site-packages\torch\multiprocessing\spawn.py", line 246, in spawn return start_processes(fn, args, nprocs, join, daemon, start_method="spawn") File "D:\software\Anaconda3\envs\bg_matting\lib\site-packages\torch\multiprocessing\spawn.py", line 202, in start_processes while not context.join(): File "D:\software\Anaconda3\envs\bg_matting\lib\site-packages\torch\multiprocessing\spawn.py", line 163, in join raise ProcessRaisedException(msg, error_index, failed_process.pid) torch.multiprocessing.spawn.ProcessRaisedException: -- Process 0 terminated with the following error: Traceback (most recent call last): File "D:\software\Anaconda3\envs\bg_matting\lib\site-packages\torch\multiprocessing\spawn.py", line 74, in _wrap fn(i, *args) File "D:\_zzw_work\gouged\py_project\BackgroundMattingV2\train_refine_ori.py", line 82, in train_worker dist.init_process_group("nccl", rank=rank, world_size=distributed_num_gpus) File "D:\software\Anaconda3\envs\bg_matting\lib\site-packages\torch\distributed\c10d_logger.py", line 74, in wrapper func_return = func(*args, **kwargs) File "D:\software\Anaconda3\envs\bg_matting\lib\site-packages\torch\distributed\distributed_c10d.py", line 1148, in init_process_group default_pg, _ = _new_process_group_helper( File "D:\software\Anaconda3\envs\bg_matting\lib\site-packages\torch\distributed\distributed_c10d.py", line 1268, in _new_process_group_helper raise RuntimeError("Distributed package doesn't have NCCL built in") RuntimeError: Distributed package doesn't have NCCL built in