    def make_default_stages(depth, block_class=None, **kwargs):
        """
        Created list of ResNet stages from pre-defined depth (one of 18, 34, 50, 101, 152).
        If it doesn't create the ResNet variant you need, please use :meth:`make_stage`
        instead for fine-grained customization.
        Args:
            depth (int): depth of ResNet
            block_class (type): the CNN block class. Has to accept
                `bottleneck_channels` argument for depth > 50.
                By default it is BasicBlock or BottleneckBlock, based on the
                depth.
            kwargs:
                other arguments to pass to `make_stage`. Should not contain
                stride and channels, as they are predefined for each depth.
        Returns:
            list[list[CNNBlockBase]]: modules in all stages; see arguments of
                :class:`ResNet.__init__`.
        """
        num_blocks_per_stage = {
            18: [2, 2, 2, 2],
            34: [3, 4, 6, 3],
            50: [3, 4, 6, 3],
            101: [3, 4, 23, 3],
            152: [3, 8, 36, 3],
        }[depth]
        if block_class is None:
            block_class = BasicBlock if depth < 50 else BottleneckBlock
        if depth < 50:
            in_channels = [64, 64, 128, 256]
            out_channels = [64, 128, 256, 512]
        else:
            in_channels = [64, 256, 512, 1024]
            out_channels = [256, 512, 1024, 2048]
        ret = []
        for n, s, i, o in zip(
            num_blocks_per_stage, [1, 2, 2, 2], in_channels, out_channels
        ):
            if depth >= 50:
                kwargs["bottleneck_channels"] = o // 4
            ret.append(
                ResNet.make_stage(
                    block_class=block_class,
                    num_blocks=n,
                    stride_per_block=[s] + [1] * (n - 1),
                    in_channels=i,
                    out_channels=o,
                    **kwargs,
                )
            )
        return ret
Created list of ResNet stages from pre-defined depth (one of 18, 34, 50, 101, 152).
If it doesn't create the ResNet variant you need, please use :meth:`make_stage`
instead for fine-grained customization.
Args:
depth (int): depth of ResNet
block_class (type): the CNN block class. Has to accept
`bottleneck_channels` argument for depth > 50.
By default it is BasicBlock or BottleneckBlock, based on the
depth.
kwargs:
other arguments to pass to `make_stage`. Should not contain
stride and channels, as they are predefined for each depth.
Returns:
list[list[CNNBlockBase]]: modules in all stages; see arguments of
:class:`ResNet.__init__`.
examples/01_resnet-50/modeling/resnet.py