← Three Kinds of Guess, and Their Data

Lesson 7 of 9

The big picture

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4 min

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Six ideas fit on one screen.

Three kinds of guess and their data, in six lines
Idea	Remember
Guess a number	Regression learns from past numbers and guesses a new number.
Group with no labels	Clustering finds groups in things with no labels. What it compares decides the groups.
Three kinds of guess	Ask what comes out. A named group is classification. A number to guess, like a price, is regression. Groups found with no labels are clustering.
What a dataset holds	A dataset is a set of records. Each record is described by attributes. One way to name a dataset is by what it holds.
Structured or unstructured data	Structured data fits rows and columns. Unstructured data does not. A dataset with both is hybrid.
Train, check, test	Train on one part. Improve with a second. Test on a third it never saw.

Ask what comes out. Then ask what the model has never seen.