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Which algorithm works by first running the standard forward pass to compute?

(a) Smoothing

(b) Modified smoothing

(c) HMM

(d) Depth-first search algorithm

This question was addressed to me at a job interview.

My question is based upon Hidden Markov Model topic in chapter Uncertain Knowledge and Reasoning of Artificial Intelligence

Select the correct answer from above options

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Right choice is (b) Modified smoothing

Easiest explanation: The modified smoothing algorithm works by first running the standard forward pass to compute and then running the backward pass.
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