Trainer(;policy, sealer=deepcopy)

A wrapper around AbstractPolicy, the sealer is used to create an immutable object from the inner parameters of policy when received a FetchParamMsg.

Worker(()->ex::Experiment)

actor(f;sz=DEFAULT_MAILBOX_SIZE)

Create a task to handle messages one-by-one by calling f(msg). A mailbox (RemoteChannel) is returned.

self()

Get the mailbox in current task.