Backpropagation and bicycle: what they have in common

1. Step 1. Backpropagation — uses — Artificial neural network. Training.
2. Step 2. Artificial neural network — is used in — Optical character recognition (OCR). Modern recognition.
3. Step 3. Optical character recognition (OCR) — uses — Image sensor. Scanning.
4. Step 4. Image sensor — is part of — Trackball. An optical sensor of the ball’s motion.
5. Step 5. Trackball — has part — Ball bearing. The ball rotates on supports.
6. Step 6. Ball bearing — is part of — Bicycle. Ball bearings in the hubs and bottom bracket let the wheels and pedals spin easily.

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