Multiclass Classification

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Multiclass classificaiton : article

Multiclass classification:

• Email foldering/tagging: Work, Friends, Family, Hobby
• Medical diagrams: Not ill, Cold, Flu
• Weather: Sunny, Cloudy, Rain, Snow

One-vs-all (one-vs-rest) :

• Train a logistic regression classifier hθ^(i) * (x) for each class i to predict the probability that y = i
• To make a prediction on a new x, pick the class that mazimizes hθ(x)