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02:48 Sep 26, 2011
This question was closed without grading. Reason: Answer found elsewhere
English to Arabic translations [PRO] IT (Information Technology) / Computational linguistics , statistical machine translation
English term or phrase:Perplexity
Perplexity is a related measure of the uncertainty of a language event. One way of looking at perplexity is in terms of word-level perplexity. The perplexity of a text with respect to the word "ice" represents the number of words which could follow it. There are some given number of words which may follow the word "ice" (cream, age, and cube), and similarly, some words which would most likely not follow "ice" (nuclear, peripheral, and happily). Since the number of possible words which could follow "ice" is relatively high, its perplexity is high. At the letter-level, the string "beV", where V is a vowel, has a low perplexity since there are only five possible vowels, and only the vowel "e" could be found in this position in any English language corpus.
Mathematically, the perplexity of a text (or word, corpus, or language) is defined as 2 raised to the power of the entropy:
PP(corpus) = 2H(corpus) [Kurser00]
Another way of looking at this is in comparing different language models with respect to their usefulness for a particular text or corpora. The perplexity of a language model with respect to text x is the reciprocal of the geometric average of the probabilities of the predictions in text x. So, if text x has k words, then the perplexity of the language model with respect to that text is
Pr(x) -1/k [Brown90, Ney98].
Because perplexity is by definition dependent on the text (or word, or corpus) itself, one must take care that the text chosen in performing this calculation is representative of the entire corpus [Brown90].
مقياس للارتياب النسبي perplexity الزملاء الأعزاء لدي سؤال: بما أن
لحدث لغوي، كيف سأعبر عن ذلك مقياس الحيرة مثلا؟
Automatic update in 00:
10 mins confidence:
مُربِك / ارتباك
Explanation: Noun 1. perplexity - trouble or confusion resulting from complexity
confusedness, disarray, mental confusion, muddiness, confusion - a mental state characterized by a lack of clear and orderly thought and behavior; "a confusion of impressions"