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B14 A SMALL STEP SIDEWAYS

The chain rule, one step at a time

Backpropagation is one calculus rule used billions of times. Follow a nudge through a chain of calculations, multiply the local rates, and check the answer with a real step.

LESSON OVERVIEW13 min lesson

Lesson overview

Backpropagation is one calculus rule used billions of times. Follow a nudge through a chain of calculations, multiply the local rates, and check the answer with a real step.

What you’ll explore

  • Trace a composed loss and multiply its local derivatives to calculate a weight update with the correct sign.
GO TO THE SOURCE

Original explanations, connected to the research.

Dive into Deep Learning — calculusRumelhart, Hinton, and Williams — back-propagating errors (1986)
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