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Expectation-Maximization with Less Arbitrariness

Introduction There are many introductions to the Expectation-Maximisation algorithm. Unfortunately every one I could find uses arbitrary seeming tricks that seem to be plucked out of a hat by magic. They can all be justified in retrospect, but I find it more useful to learn from reusable techniques that you can apply to further problems. Examples of tricks I've seen used are: Using Jensen's inequality.
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