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The algorithm that computes how each parameter in a neural network contributed to the final error. It applies the chain rule of calculus backward through the layers, producing gradients used by an optimizer. Without backpropagation, training deep networks at scale would be impractical.
Most AI engineers do not implement backpropagation by hand, but every framework you use relies on it. Reading PyTorch traces, debugging vanishing gradients, and explaining training behavior all require fluency.
The algorithm that computes how each parameter in a neural network contributed to the final error. It applies the chain rule of calculus backward through the layers, producing gradients used by an optimizer. Without backpropagation, training deep networks at scale would be impractical.
Most AI engineers do not implement backpropagation by hand, but every framework you use relies on it. Reading PyTorch traces, debugging vanishing gradients, and explaining training behavior all require fluency.
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
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