ConvModule¶

class mmcv.cnn.ConvModule(in_channels: int, out_channels: int, kernel_size: Union[int, Tuple[int, int]], stride: Union[int, Tuple[int, int]] = 1, padding: Union[int, Tuple[int, int]] = 0, dilation: Union[int, Tuple[int, int]] = 1, groups: int = 1, bias: Union[bool, str] = 'auto', conv_cfg: Optional[Dict] = None, norm_cfg: Optional[Dict] = None, act_cfg: Optional[Dict] = {'type': 'ReLU'}, inplace: bool = True, with_spectral_norm: bool = False, padding_mode: str = 'zeros', order: tuple = ('conv', 'norm', 'act'))[source]¶

A conv block that bundles conv/norm/activation layers.

This block simplifies the usage of convolution layers, which are commonly used with a norm layer (e.g., BatchNorm) and activation layer (e.g., ReLU). It is based upon three build methods: build_conv_layer(), build_norm_layer() and build_activation_layer().

Besides, we add some additional features in this module. 1. Automatically set bias of the conv layer. 2. Spectral norm is supported. 3. More padding modes are supported. Before PyTorch 1.5, nn.Conv2d only supports zero and circular padding, and we add “reflect” padding mode.

Parameters

in_channels (int) – Number of channels in the input feature map. Same as that in nn._ConvNd.
out_channels (int) – Number of channels produced by the convolution. Same as that in nn._ConvNd.
kernel_size (int | tuple[int]) – Size of the convolving kernel. Same as that in nn._ConvNd.
stride (int | tuple[int]) – Stride of the convolution. Same as that in nn._ConvNd.
padding (int | tuple[int]) – Zero-padding added to both sides of the input. Same as that in nn._ConvNd.
dilation (int | tuple[int]) – Spacing between kernel elements. Same as that in nn._ConvNd.
groups (int) – Number of blocked connections from input channels to output channels. Same as that in nn._ConvNd.
bias (bool | str) – If specified as auto, it will be decided by the norm_cfg. Bias will be set as True if norm_cfg is None, otherwise False. Default: “auto”.
conv_cfg (dict) – Config dict for convolution layer. Default: None, which means using conv2d.
norm_cfg (dict) – Config dict for normalization layer. Default: None.
act_cfg (dict) – Config dict for activation layer. Default: dict(type=’ReLU’).
inplace (bool) – Whether to use inplace mode for activation. Default: True.
with_spectral_norm (bool) – Whether use spectral norm in conv module. Default: False.
padding_mode (str) – If the padding_mode has not been supported by current Conv2d in PyTorch, we will use our own padding layer instead. Currently, we support [‘zeros’, ‘circular’] with official implementation and [‘reflect’] with our own implementation. Default: ‘zeros’.
order (tuple[str]) – The order of conv/norm/activation layers. It is a sequence of “conv”, “norm” and “act”. Common examples are (“conv”, “norm”, “act”) and (“act”, “conv”, “norm”). Default: (‘conv’, ‘norm’, ‘act’).

forward(x: torch.Tensor, activate: bool = True, norm: bool = True) → torch.Tensor [source]¶

Defines the computation performed at every call.

Should be overridden by all subclasses.

Note

Although the recipe for forward pass needs to be defined within this function, one should call the Module instance afterwards instead of this since the former takes care of running the registered hooks while the latter silently ignores them.