上面的一切工作都像在视频中一样，我现在发现一个类中的文件夹中的数据现在来了，这看起来好像没有错误，但我不知道。

Question

class Netz(nn.Module):
    def __init__(self):
        super(Netz, self).__init__()
        self.conv1 = nn.Conv2d(1, 10, kernel_size= 4)
        self.conv2 = nn.Conv2d(10, 20, kernel_size= 4)
        self.conv_dropout = nn.Dropout2d() 
        self.fc1 = nn.Linear(320, 60)
        self.fc2 = nn.Linear(60, 10)

    def forward(self, x):
        x = self.conv1(x)
        x = F.max_pool2d(x, 4)
        x = F.relu(x)
        x = self.conv2(x)
        x = self.conv_dropout(x)
        x = F.max_pool2d(x, 4)
        x = F.relu(x)
        print(x.size())
        exit()


model = Netz()
model.cuda()

具有此Varibale函数的功能是错误的，它只是无法正常工作，而且pycharm还向我显示必须有问题，但是我不知道是什么，所以我在这里问也许您可以帮助我也对其进行google搜索，并且看起来这是一件易事被删除或如此，但我不知道该怎么写

optimizer = optim.SGD(model.parameters(), lr=0.1, momentum=0.8)
def train(epoch):
    model.train()
    for batch_id, (data, target) in enumerate(train_data):
        data = data.cuda()
        target = target.cuda()
        data = Variable(data)
        target = Variable(target)
        optimizer.zero_grad()
        out = model(data)
        criterion = F.nll_loss
        loss = criterion(out, target)
        loss.backward()
        optimizer.step()

for epoch in range(1, 30):
    train(epoch)
错误代码如下：

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\spawn.py", line 105, in spawn_main
    exitcode = _main(fd)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\spawn.py", line 114, in _main
    prepare(preparation_data)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\spawn.py", line 225, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\spawn.py", line 277, in _fixup_main_from_path
    run_name="__mp_main__")
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 263, in run_path
    pkg_name=pkg_name, script_name=fname)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\mnist handwriting.py", line 60, in <module>
    train(epoch)
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\mnist handwriting.py", line 46, in train
    for batch_id, (data, target) in enumerate(train_data):
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\venv\lib\site-packages\torch\utils\data\dataloader.py", line 279, in __iter__
    return _MultiProcessingDataLoaderIter(self)
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\venv\lib\site-packages\torch\utils\data\dataloader.py", line 719, in __init__
    w.start()
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\process.py", line 112, in start
    self._popen = self._Popen(self)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\context.py", line 223, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\context.py", line 322, in _Popen
    return Popen(process_obj)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\popen_spawn_win32.py", line 46, in __init__
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\spawn.py", line 143, in get_preparation_data
    _check_not_importing_main()
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\multiprocessing\spawn.py", line 136, in _check_not_importing_main
    is not going to be frozen to produce an executable.''')
RuntimeError: 
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper idiom
        in the main module:

            if __name__ == '__main__':
                freeze_support()
                ...

        The "freeze_support()" line can be omitted if the program
        is not going to be frozen to produce an executable.
Traceback (most recent call last):
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\venv\lib\site-packages\torch\utils\data\dataloader.py", line 761, in _try_get_data
    data = self._data_queue.get(timeout=timeout)
  File "C:\Users\Finnw\AppData\Local\Programs\Python\Python37\lib\queue.py", line 178, in get
    raise Empty
_queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users/Finnw/PycharmProjects/pytorch 3.7/mnist handwriting.py", line 60, in <module>
    train(epoch)
  File "C:/Users/Finnw/PycharmProjects/pytorch 3.7/mnist handwriting.py", line 46, in train
    for batch_id, (data, target) in enumerate(train_data):
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\venv\lib\site-packages\torch\utils\data\dataloader.py", line 345, in __next__
    data = self._next_data()
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\venv\lib\site-packages\torch\utils\data\dataloader.py", line 841, in _next_data
    idx, data = self._get_data()
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\venv\lib\site-packages\torch\utils\data\dataloader.py", line 798, in _get_data
    success, data = self._try_get_data()
  File "C:\Users\Finnw\PycharmProjects\pytorch 3.7\venv\lib\site-packages\torch\utils\data\dataloader.py", line 774, in _try_get_data
    raise RuntimeError('DataLoader worker (pid(s) {}) exited unexpectedly'.format(pids_str))
RuntimeError: DataLoader worker (pid(s) 10444) exited unexpectedly

Process finished with exit code 1

[我开始学习pytorch，并从有关MNIST笔迹的视频开始，并通过视频进行了学习，但是该视频已有2年的历史了，从那以后我觉得有些变化，因为它很重要...

Answer 1