Perplexity Calculator Online

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:

Perplexity(X):=2^H(X)
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