Introduction
In scikit-learn you call model.fit(X, y) and training happens inside. In PyTorch you write the training loop yourself. It sounds like more work, but it's only a few lines — and it gives you complete control and a clear view of what training actually does.
Think of it as a coach running practice sessions: show the player some examples, see how they do, explain the mistakes, let them adjust — and repeat, session after session, checking regularly on a separate test of skills.