Artificial Intelligence / Unit 8 AI 0457 short lesson, about 20 seconds
Backward Blame
Captions available
The idea
Backpropagation gives every knob in a stack its blame share, passed layer by layer from output toward input in one backward sweep.
In practice
A buried knob answers through the numbers it fed forward: its influence on them, times their influence on the error.
Where people slip
The accounting is exact — the same numbers a ruinous knob-by-knob census would produce, at a millionth the cost.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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