Perplexity Calculator Online

Perplexity Calculator Description

Perplexity is a measure of a probability model's ability to accurately forecast a sample. Perplexity is one technique to assess language models in the context of natural language processing.

Perplexity Intuition Calculator Formula:

Perplexity formula

Example Input: 0.1, 0.5, 0.7, 0.4

Values must be in between 0 and 1

Perplexity Calculator Explanation


Perplexity, which measures the uncertainty of a random variable, is an information-theoretical quantity like entropy. The two terms can actually be used interchangeably because perplexity is just a monotonic function of entropy.

A parameter for the well-known t-SNE dimensionality reduction algorithm, perplexity is an information theoretic quantity that appears in a variety of contexts, including natural language processing.

Perplexity offers a measurement of the degree of uncertainty in a random variable, similar to entropy. In reality, perplexity is only an entropy-monotonic function. The definition of perplexity for a discrete random variable, X, is:

where H(X) represents X's entropy.

How to use Calculate Perplexity using Calculator?

  • You need to enter the value of P - Probabilities in the first input field given in the form. Remember each probability is seperated with comma and each value must be in between 0 and 1.
  • The result will automatically appear below.

More Calculation Examples (Perplexity Entropy Examples)

  • Probabilities - P: 0.1, 0.4, 0.5, 0.7
  • Perplexity = 1.721

  • Probabilities - P: 0.2, 0.3, 0.7, 0.1
  • Perplexity = 1.678

  • Probabilities - P: 0.6, 0.3, 0.5, 0.4, 0.1
  • Perplexity = 2.324

  • Probabilities - P: 0.2, 0.9, 0.3
  • Perplexity = 1.122

Perplexity Calculator


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