Solutions

LM-C02-C-001: There are 5 files and each file is one document, so there are 5 documents.

LM-C02-C-002: Cat, cat, and CAT all become cat, so the count is 3.

LM-C02-C-003: The text has three word items: small, models, and learn.

LM-C02-C-004: The correct answer is 2. The validation split is used to choose between settings or model versions.

LM-C02-C-005: The correct answer is 1. If test evidence changes preprocessing or modeling decisions, the test result is no longer a clean final check.