POS Tagging - Viterbi Decoding

What is the primary purpose of the Viterbi algorithm in Natural Language Processing?
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In the context of POS tagging, what do the 'hidden states' represent in a Hidden Markov Model?
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What information does the emission matrix provide in HMM-based POS tagging?
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What does the transition matrix represent in the context of POS tagging?
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What is the key computational technique that makes the Viterbi algorithm efficient?
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In the Viterbi algorithm, what does each cell V[i][j] in the Viterbi table represent?
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What is the time complexity of the Viterbi algorithm for a sentence of length N with T possible tags?
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In the Viterbi algorithm, why is backtracking necessary after filling the table?
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Consider a sentence 'Book a park' where 'Book' could be either a noun or verb. How does the Viterbi algorithm handle this ambiguity?
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