Stopping backward in hook?

1

There is a somewhat complicated implementation of truncated backpropagation through time here.

What I’d like to know is if it is possible to register a hook on state such that when loss.backward() is called the hook can stop backpropagation after several steps through the history of state. Or perhaps, can I write a wrapper for state such that it’s backward() method stops the backpropagation after a certain number of calls.

2

You want to backpropagate through your graph for only a certain number of steps. Correct me if I am wrong.
One way would be to backprop through the complete graph and only update the gradients for your required layers.