src/transformers/models/bit/modeling_bit.py/BitDownsampleConv/__init__
class BitDownsampleConv:    def __init__(
        self,
        config,
        in_channels,
        out_channels,
        stride=1,
        preact=True,
    ):
        super().__init__()
        self.conv = WeightStandardizedConv2d(
            in_channels, out_channels, 1, stride=stride, eps=1e-8, padding=config.global_padding
        )
        self.norm = (
            nn.Identity()
            if preact
            else BitGroupNormActivation(config, num_channels=out_channels, apply_activation=False)
        )