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intuition - What is perplexity? - Cross Validated Perplexity is (1 N1 N) = N So perplexity represents the number of sides of a fair die that when rolled, produces a sequence with the same entropy as your given probability distribution Number of States OK, so now that we have an intuitive definition of perplexity, let's take a quick look at how it is affected by the number of states in a model
Comparing Perplexities With Different Data Set Sizes Would comparing perplexities be invalidated by the different data set sizes? No I copy below some text on perplexity I wrote with some students for a natural language processing course (assume log log is base 2): In order to assess the quality of a language model, one needs to define evaluation metrics One evaluation metric is the log-likelihood of a text, which is computed as follows
Finding the perplexity of multiple examples - Cross Validated I am trying to find a way to calculate perplexity of a language model of multiple 3-word examples from my test set, or perplexity of the corpus of the test set As the test set, I have a paragraph
machine learning - Why does lower perplexity indicate better . . . The perplexity, used by convention in language modeling, is monotonically decreasing in the likelihood of the test data, and is algebraicly equivalent to the inverse of the geometric mean per-word likelihood A lower perplexity score indicates better generalization performance I e, a lower perplexity indicates that the data are more likely
How to find the perplexity of a corpus - Cross Validated If I understand it correctly, this means that I could calculate the perplexity of a single sentence What does it mean if I'm asked to calculate the perplexity on a whole corpus?
Inferring the number of topics for gensims LDA - perplexity, CM, AIC . . . Having negative perplexity apparently is due to infinitesimal probabilities being converted to the log scale automatically by Gensim, but even though a lower perplexity is desired, the lower bound value denotes deterioration (according to this), so the lower bound value of perplexity is deteriorating with a larger number of topics in my figures