The index m in finite mixture models, as in Eq. (12.1), can be extended to be a

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The index m in finite mixture models, as in Eq. (12.1), can be extended to be a continuous variable y 2 R:

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This is called an infinite mixture model if ¯
w¹yº dy = 1 and ¯
p¹x j , yº dx = 1 (8, y) hold. Extend the EM algorithm to the infinite mixture models:

a. Define the auxiliary function for an infinite mixture model.

b. Design the E-step and M-step for an infinite mixture model.

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