Deep learning and railway semaphore: what they have in common

1. Step 1. Deep learning — uses — Graphics processing unit. Training on GPUs.
2. Step 2. Graphics processing unit — is part of — Supercomputer. Modern supercomputers run on GPUs.
3. Step 3. Supercomputer — is used in — Weather forecast. Numerical forecasting.
4. Step 4. Weather forecast — uses — Electrical telegraph. Collecting reports by telegraph.
5. Step 5. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.
6. Step 6. Optical telegraph — evolved into — Railway semaphore. The semaphore idea.

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