ModuleChain to replace ModuleCompose

[samedii]

    (
        ChainModule.from_datastream(datastream)
        .map(...)
        .starmap(...)
    )

Alternative:

        self.model = (
            ModuleChain()
            .map(nn.Conv2d(...))
            .map(nn.Conv2d(...), lambda module, x: (
                module(x),
                module(x + 10),
            )
            .starmap(...)
        )

Should it be called .chain instead?