NorthPeak technicians write free text. The first incident of data/clean/incidents.csv reads Overheating alarm on M001. Cooling fan running but airflow blocked by dust. A model computes with numbers, so this sentence must first be cut into small pieces and cleaned. Every cleaning step makes the pieces more uniform, and every step also loses something. This lesson covers tokenization, normalization, and what to check before you trust the result.
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