01 · Understand the idea
In simple words
Unsupervised learning looks for structure in data without requiring a target label for every example. Clustering and dimensionality reduction are common types. Finding a pattern does not tell you automatically what it means. Your features and assumptions influence the structure you see.
Words to know
Structure: patterns or relationships in data. Representation: how an item is described numerically.
Pause here and explain the definition in one sentence without copying it. The aim is to describe what the system does, not to memorise an impressive phrase.
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