it depends on how busy your cpu cores are for other tasks, speed of cpu, speed of your hard disk etc. In short, its complicated, so setting workers to number of cores is a good rule of thumb, nothing more. CPU 通常跑 100 个进程也不会有问题,worker 进程亦然。所以超过 CPU 核心的num_...
colab的warning message的来源就是check_worker_number_rationality()这个方法,这个方法定义的源码开头,讲述了进行num_workers设定合理性检查的原因。 This function check whether the dataloader’s worker number is rational based on current system’s resource. Current rule is that if the number of workers this...
如果该变量和取出来的send_idx是一致的，那就说明worker存放的顺序和发送顺序相同。如果不一致，说明发生...
类的定义为:torch.utils.data.DataLoader,其中包含的参数有: torch.utils.data.DataLoader(dataset,batch_size=1,shuffle=False,sampler=None,\batch_sampler=None,num_workers=0,collate_fn=None,pin_memory=False,\drop_last=False,timeout=0,worker_init_fn=None,multiprocessing_context=None) dataset:定义的data...
pytorch中dataloader一次性创建num_workers个子线程,然后用batch_sampler将指定batch分配给指定worker,worker将它负责的batch加载进RAM,dataloader就可以直接从RAM中找本轮迭代要用的batch。如果num_worker设置得大,好处是寻batch速度快,因为下一轮迭代的batch很可能在上一轮/上上一轮...迭代时已经加载好了。坏处是内存...
shuffle=True, num_workers=args.num_worker)# there are 10 classes so the dataset name is cifar-10classes = ('plane','car','bird','cat','deer','dog','frog','horse','ship','truck') print('==> Making model..') net = pyramidnet() ...
Or the number of CPU cores in my machine? Or to discuss.pytorch.org 위에 토론에는 생각해볼만한 다양한 이슈들을 확인할 수 있기 때문에 일독을 권합니다. 여기까지 num_workers 파라미터가 어떤 역할을 수...
if anyworker_queue_idx=next(self._worker_queue_idx_cycle)ifself._workers_status[worker_queue_idx]:breakelse:# not found (i.e., didn't break)returnself._index_queues[worker_queue_idx].put((self._send_idx,index))self._task_info[self._send_idx]=(worker_queue_idx,)self._tasks_outstan...
It freezes when num_worker is ever set (even set to be 1!). When I do not set num_workers, everything goes well. torch.__version__: '1.7.0'` sys.version: '3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)]' Same issue under cpu only environment. (...
i am facing exactly this same issue : #15808 in windows 10, i used, anaconda virtual environment where i have, python 3.8.5 pytorch 1.7.0 cuda 11.0 cudnn 8004 gpu rtx 3060ti Is CUDA available: Yes related post : https://stackoverflow.com...