Lesson 6 Advanced Discussion ✅

Part 1 (2019) Advanced (Part 1 v3)
2

In my understanding a context manager is designed to make sure that the resource is reclaimed at the end of the scope of the context. Whereas, in lesson6-pets-more.ipynb we actually return the object which should normally be destroyed by the time we get to return():

def hooked_backward(cat=y):
    with hook_output(m[0]) as hook_a: 
        with hook_output(m[0], grad=True) as hook_g:
            preds = m(xb)
            preds[0,int(cat)].backward()
    return hook_a,hook_g

That feels very unintuitive. What am I missing?

Thanks.

6 Likes