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[D] Approaches to array feature

Do you know approaches to array/bag features?

To be specific let’s say we have classification problem and want to sort out things as good or bad. For example: * Feature1 – regular feature, limited set of values: A, B, C * Feature2 – array/bag feature, container feature consisting of unknown number of values

Feature1 Feature2 Good?
A [A, B] Yes
B [B, A, A] No
A [B, C, B, C, A] Yes

How do one encode Feature2 to a numeric vector?

submitted by /u/truri
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Toronto AI is a social and collaborative hub to unite AI innovators of Toronto and surrounding areas. We explore AI technologies in digital art and music, healthcare, marketing, fintech, vr, robotics and more. Toronto AI was founded by Dave MacDonald and Patrick O'Mara.