Broadcast¶

class continual.Broadcast(num_streams=None)[source]¶

Broadcast one input stream to multiple output streams.

This is needed for handling parallel streams in subsequent modules. For instance, here is how it is used to create a residual connection:

residual = co.Sequential(
    co.Broadcast(2),
    co.Parallel(
        co.Conv3d(32, 32, kernel_size=3, padding=1),
        co.Delay(2),
    ),
    co.Reduce("sum"),
)

Since the Broadcast -> Parallel -> Reduce sequence is so common, identical behavior can be achieved with BroadcastReduce

residual = co.BroadcastReduce(
    co.Conv3d(32, 32, kernel_size=3, padding=1),
    co.Delay(2),
    reduce="sum"
)

Even shorter, the library features a residual connection, which automatically handles delays:

residual = co.Residual(co.Conv3d(32, 32, kernel_size=3, padding=1))

Parameters:: num_streams (int) – Number of streams to broadcast to. If none are given, a Sequential module may infer it automatically.