Artificial Intelligence / AI 0303 · Atom · ~20 seconds
The Licensed Crossing
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State
Bayes' rule converts reasoning from causes into reasoning toward them: nature hands agents likelihoods — how often a condition produces a sign — while agents need posteriors: which condition, given the sign.
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Diagnosis, spam filtering, and speech recognition are all this crossing performed at scale.
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The crossing's toll is the prior — forget it and you have transposed the conditional, not crossed it.