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OSError: [Errno 12] Cannot allocate memory

参考：

死亡Error：OSError: [Errno 12] Cannot allocate memory

OSError: [Errno 12] Cannot allocate memory. But memory usage is actually normal

执行PyTorch程序，发生内存不足错误

内存查询

监视内存，查看是否是内存不足

# 打开两个窗口，分别查看CPU内存和显卡内存
# 每隔1秒查询一次
$ watch -n 1 free -m
$ wathc -n 1 nvidia-smi

num_workers

确实不是因为内存不足，那么修改DataLoader的num_workers为0，再重新运行即可

        num_workers (int, optional): how many subprocesses to use for data
            loading. ``0`` means that the data will be loaded in the main process.
            (default: ``0``)