下面两个类有什么区别吗？我知道inplace是什么（如果inplace是True，则不需要执行x = function(x)，而只需执行function(x)来修改x）。但是这里因为我们return self.conv(x)，应该没关系吧？

class ConvBlock(nn.Module):

    def __init__(
        self,
        in_channels,
        out_channels,
        down=True,
        use_act=True,
        **kwargs
        ):
        super().__init__()
        self.conv = nn.Sequential((nn.Conv2d(in_channels, out_channels,
                                  padding_mode='reflect',
                                  **kwargs) if down else nn.ConvTranspose2d(in_channels,
                                  out_channels, **kwargs)),
                                  nn.InstanceNorm2d(out_channels),
                                  (nn.ReLU() if use_act else nn.Identity()))

    def forward(self, x):
        return self.conv(x)

class ConvBlockInplace(nn.Module):

    def __init__(
        self,
        in_channels,
        out_channels,
        down=True,
        use_act=True,
        **kwargs
        ):
        super().__init__()
        self.conv = nn.Sequential((nn.Conv2d(in_channels, out_channels,
                                  padding_mode='reflect',
                                  **kwargs) if down else nn.ConvTranspose2d(in_channels,
                                  out_channels, **kwargs)),
                                  nn.InstanceNorm2d(out_channels),
                                  (nn.ReLU(inplace=True) if use_act else nn.Identity()))

    def forward(self, x):
        return self.conv(x)

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