What is Bayesian Network & Why its Important?
Updated on Nov 30, 2022 | 7 min read | 6.4k views
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Updated on Nov 30, 2022 | 7 min read | 6.4k views
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Every day, data science specialists use innovative and advanced AI technologies, Machine Learning, and Advanced analytics to tackle various business challenges. The primary goal of addressing these challenges is to provide dependable, efficient, and error-free solutions. However, when using these methodologies, it’s critical to provide actionable
data to drive the model output so that end-users may effectively leverage these solutions to make critical business choices. This requirement applies to AI solutions developed across industries.
One such machine-learning approach that focuses on generating actionable information is the Bayesian Network. In this article, we will discuss the Bayesian network in detail.
The Bayesian network is a crucial computer technique for coping with unpredictable occurrences and solving associated problems. Let’s start with probabilistic models before moving on to Bayesian networks.
After determining the link between variables using probabilistic models, you may compute the various probabilities of those two values. A Probabilistic Graphical Model is another name for a Bayesian Network (PGM).
Conditional models, for example, require a large quantity of data and information to compute all conceivable outcomes, and putting all of those possibilities to the test is challenging. The simplification of the probability of the random variables is extremely useful.
It has two subdivisions:
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Bayesian belief networks are used in developing search engines, diagnosing various diseases, filtering spam emails, gene regulatory networks, and for many more similar works.
This network’s primary goal is to comprehend the idea of causality relationships. Let’s conceive of this as a sickness diagnostic. The symptoms are right in front of your eyes, and you can diagnose the disease just by looking at them. For example, when a new patient comes in, doctors assess their symptoms to see if they have any illnesses. In addition, the network provides probabilities for each illness.
Other logical issues and judgments might benefit from similar causality relationships, providing spectacular outcomes.
The Bayesian belief network determines the associations between numbers.
The following is a rundown of how the Bayesian network works:
A Bayesian Belief network consists of 2 components:
An Influence diagram is an extended type of Bayesian network that illustrates and solves decision problems under uncertain knowledge. It is made up of nodes and arcs.
Each node represents a random variable, which is either continuous or discontinuous. Arcs or directed arrows represent the causal link or conditional probabilities between random variables. The arrows are directed connections used to connect two nodes to each other.
The links indicate that one node directly impacts the other, and if there are no directed links, nodes are independent of one another.
Bayesian belief networks have several advantages, including the ability to show different probabilities of variables. Here are a few examples:
To create a Bayesian network, you must first ask yourself three questions:
All of these issues may be answered by an expert, who can also recommend a design for the Bayesian Belief Network model. Specialists usually define the architecture of such models, but you must derive the probability distributions from the available data. The data may be used to determine probability distributions and graph structure. However, this is a time-consuming operation.
You may compute the graph using algorithms. For example, to calculate the distribution parameters, assume a Gaussian distribution for continuous random variables.
You may utilize the Bayesian Belief Network for logical reasoning, such as gaining solutions to situational situations and making judgments, once it is ready for any domain.
The reasoning is conducted by the model’s interpretation of a particular problem or circumstance. If the outcome of certain events is known, for example, the model estimates all the probability of causes and other alternative results automatically.
Bayesian Neural Networks (BNNs) uses posterior inference to control overfitting. In a broader sense, the Bayesian approach employs statistical methodology to ensure that everything, including model parameters, is assigned a probability distribution (weights and biases in neural networks). Variables that can accept a specified value in programming languages will provide the same outcome every time you access that variable.
In Artificial Intelligence, Bayesian networks are widely employed to deal with business activities, one of which is spam screening in your email account. It’s also used in image processing, where it help transform photos into various digital forms. BNNs have also made significant contributions to medical research and innovation, such as Biomonitoring that uses markers to assess the number of tissues existing in our bodies.
If you’d like to learn more about Bayesian neural networks and other key concepts of machine learning and artificial intelligence, we recommend you join the Executive PG Program in Machine Learning & Artificial Intelligence. The 12-months course is offered by IIIT Bangalore in association with upGrad and exposes you to a world-class curriculum plus a paid learner base of 40,000+ for collaborative opportunities.
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