# 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:**

Example Input: 0.1, 0.5, 0.7, 0.4

Values must be in between 0 and 1

### Perplexity Calculator Explanation

#### 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

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