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In information theory, perplexity is a measure of uncertainty in the value of a sample from a discrete probability distribution. The larger the perplexity, the less likely it is that an observer can guess the value which will be drawn from the distribution. Perplexity was originally introduced in 1977 in the context of speech recognition by Frederick Jelinek, Robert Leroy Mercer, Lalit R. Bahl, and James K. Baker.[1]
^Jelinek, F.; Mercer, R. L.; Bahl, L. R.; Baker, J. K. (1977). "Perplexity—a measure of the difficulty of speech recognition tasks". The Journal of the Acoustical Society of America. 62 (S1): S63–S63. doi:10.1121/1.2016299. ISSN 0001-4966.
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