问题：RuntimeError: Default process group has not been initialized, please make sure to call init_process_group.
解决： github503问题，解决方案，windows环境使用detectron2 # 503文章来源地址https://www.toymoban.com/news/detail-522707.html
cuda_num = os.environ['CUDA_VISIBLE_DEVICES']
cuda_num_list = list(cuda_num.split(","))
if len(cuda_num_list) == 1:
import torch.distributed as dist
dist.init_process_group(backend='nccl', init_method='tcp://localhost:23456', rank=0, world_size=1)
出现报错 RuntimeError: Distributed package doesn't have NCCL built in
原因分析： windows不支持NCCL backend
解决方案： 在dist.init_process_group语句之前添加backend=‘gloo’，也就是在windows中使用GLOO替代NCCL
文章来源：https://www.toymoban.com/news/detail-522707.html
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