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What is Bayes Theorem?

Bayes’ theorem is a recipe that depicts how to refresh the probabilities of theories when given proof. It pursues basically from the maxims of conditional probability; however, it can be utilized to capably reason about a wide scope of issues, including conviction refreshes.

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It is a beautiful concept of Probability where we find the probability when we know other probability:

Furthermore, how likely An is without anyone else, composed P(A)

What’s more, how likely B is without anyone else, composed P(B)

Example of Bayes Theorem

So we should place that in the equation:

P(Rain) Probability that it will be Rain = 10%(Given)

P(Cloud) is the Probability that Clouds are there = 40%

So we can say that In c:

Use of Bayes Theorem in Machine Learning

Naive Bayes Classifier:

This is a solid supposition that is most far-fetched in genuine information; for example, the properties don’t communicate. By and by, the methodology performs shockingly well on information where this presumption doesn’t hold.

Portrayal Used By Naive Bayes Models:

The portrayal of a naive Bayes algorithm is chúng tôi with probabilities are put away to petition for a scholarly naive Bayesian model.

This incorporates:

Class Probability: The probability for everything in the preparation dataset.

Conditional Probability: The conditional probability for every instance info worth given each class esteem.

Take in a Naive Bayes Model From Data. Taking in a naive Bayesian model from preparation information is quick. Preparing is quick because lone the probability values for every instance of the class and the probability value for every instance of the class given distinctive information (x) values should be determined. Enhancement systems should fit no coefficients.

Figuring Class Probabilities

For instance, in a parallel class, the probability of a case having a place with class 1 is determined as:

Probability (class=1) = total(class=1)/(total(class=0) + total(class=1))

In the most straightforward case, every class has a probability of 0.5 or half for a two-fold classification issue with a similar number of occurrences in every instance of the class.

Figuring Conditional Probability

The conditional probabilities are the recurrence of each trait esteem for a given class worth partitioned by the recurrence of examples with that class esteem.

All Applications of Bayes’ Theorem

There are a lot of utilizations of the Bayes’ Theorem in reality. Try not to stress on the off chance that you don’t see all the arithmetic included immediately. Simply getting a feeling of how it functions is adequate to begin.

Bayesian Decision Theory is a measurable way to deal with the issue of example classification. Under this hypothesis, it is expected that the basic probability conveyance for the classes is known. In this way, we acquire a perfect Bayes Classifier against which every other classifier is decided for execution.

We will talk about the three fundamental uses of Bayes’ Theorem:

Naive Bayes’ Classifier

Discriminant Functions and Decision Surfaces

Bayesian Parameter Estimation


The magnificence and intensity of Bayes’ Theorem never stop to astound me. A basic idea, given by a priest who passed on over 250 years back, has its utilization in the absolute most unmistakable AI procedures today.

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This is a guide to Bayes Theorem. Here we discuss the use of bayes theorem in machine learning and the portrayal used by naive bayes models with examples. You may also have a look at the following articles to learn more –

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