Neural networks reflect the behavior of the human brain, allowing computer programs to recognize patterns and solve problems in artificial intelligence, machine learning, and deep learning. Neural networks have a layered structure, taking input data and passing it through multiple layers of nodes that perform computations and transfer the output to the next layer. Through a process of backpropagation, neural networks can learn from experience by adjusting their weights to minimize error rates. They have applications in areas like facial recognition, machine translation, and more.

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NEURAL NETWORK IN ARTIFICIAL INTELLIGENCE
Table of Contents
1. Introduction:.....................................................................................................................1
2. Artificial Intelligence:.......................................................................................................1
2.1 Introduction to Artificial Intelligence .....................................................................1
2.2 How Artificial Intelligence Works?.........................................................................1
2.3 Advantages.................................................................................................................1
3. Machine Learning.............................................................................................................2
3.1 Machine Learning Methods .....................................................................................2
3.1.1 Supervised Learning..........................................................................................2
3.1.2 Unsupervised Learning .....................................................................................2
3.1.3 Semi-supervised Learning.................................................................................2
4. Neural Network.................................................................................................................3
4.1 Layering Structure....................................................................................................3
4.2 Applications of Neural Network ..............................................................................3
4.3 Explanation................................................................................................................4
4.3.1 Back propagation...............................................................................................4
4.4 How Neural Network actually works? ....................................................................5

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....................................................................................................................................................5
5. References..........................................................................................................................6

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1. Introduction:
Neural networks reflect the behavior of the human brain, allowing computer programs to
recognize patterns and solve common problems in the fields of AI, machine learning, and deep
learning.
2. Artificial Intelligence:
The intelligence proved by machines is known as Artificial Intelligence. Artificial Intelligence
has grown to be very popular in today’s world. It is the recreation of natural intelligence in
machines that are programmed to learn and impressionist the actions of humans. These
machines are able to learn with experience and perform human-like tasks. As technologies such
as AI continue to grow, they will have a great impact on our quality of life. It’s but natural that
everyone today wants to connect with AI technology somehow, may it be as an end-user or
following a career in Artificial Intelligence.[1]
2.1 Introduction to Artificial Intelligence
The short answer to What is Artificial Intelligence is that it depends on who you ask.
A layman with a brief understanding of technology would link it to robots. They’d say
Artificial Intelligence is a terminator like-figure that can act and think on its own.
If you ask about artificial intelligence to an AI researcher, (s)he would say that it’s a set of
algorithms that can produce results without having to be explicitly instructed to do so.[1]
2.2 How Artificial Intelligence Works?
To understand How Artificial Intelligence actually works, one needs to deep dive into the
various sub-domains of Artificial Intelligence and understand how those domains could be
applied to the various fields of the industry.
 Machine Learning: ML teaches a machine how to make inferences and decisions
based on past experience. It identifies patterns, analyses past data to infer the
meaning of these data points to reach a possible conclusion without having to
involve human experience. This automation to reach conclusions by evaluating data,
saves a human time for businesses and helps them make a better decision.
 Neural Network: Neural Networks work on the similar principles as of Human
Neural cells. They are a series of algorithms that captures the relationship between
various underlying variables and processes the data as a human brain does.
2.3 Advantages
 Reduction in human error
 Available 24x7
 Faster and more accurate decisions
 Improves security
 Digital assistance

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 Medical applications
 Helps in repetitive work
3. Machine Learning
Machine learning is the study of computer algorithms that can improve automatically through
experience and by the use of data. It is seen as a part of artificial intelligence.
Machine learning (ML) is a type of artificial intelligence (AI) that allows software
applications to become more accurate at predicting outcomes without being explicitly
programmed to do so. Machine learning algorithms use historical data as input to predict new
output values. The process of learning begins with observations or data, such as examples,
direct experience, or instruction, in order to look for patterns in data and make better decisions
in the future based on the examples that we provide. The primary aim is to allow the computers
learn automatically without human intervention or assistance and adjust actions accordingly.
3.1 Machine Learning Methods
Machine learning algorithms are often categorized as supervised or unsupervised.
3.1.1 Supervised Learning
It can apply what has been learned in the past to new data using labeled examples to predict
future events. Starting from the analysis of a known training dataset, the learning algorithm
produces an inferred function to make predictions about the output values. The system is able
to provide targets for any new input after sufficient training. The learning algorithm can also
compare its output with the correct, intended output and find errors in order to modify the
model accordingly.
3.1.2 Unsupervised Learning
It is used when the information used to train is neither classified nor labeled. Unsupervised
learning studies how systems can infer a function to describe a hidden structure from unlabeled
data. The system doesn’t figure out the right output, but it explores the data and can draw
inferences from datasets to describe hidden structures from unlabeled data.
3.1.3 Semi-supervised Learning
It falls somewhere in between supervised and unsupervised learning, since they use both
labeled and unlabeled data for training – typically a small amount of labeled data and a large
amount of unlabeled data. The systems that use this method are able to considerably improve
learning accuracy. Usually, semi-supervised learning is chosen when the acquired labeled data
requires skilled and relevant resources in order to train it / learn from it. Otherwise, acquiring
unlabeled data generally doesn’t require additional resources.

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4. Neural Network
‘Neural’ word derived from “neurons” and ‘Network’ means “combining”. So Neural Network
means combining neurons together.
Input data Meaning Neural Network implementation
Neural networks reflect the behavior of the human brain, allowing computer programs to
recognize patterns and solve common problems in the fields of AI, machine learning. Artificial
neural networks (ANN) have been developed as generalizations of mathematical models of
biological nervous systems. An Artificial Neural Network is a network of collections of very
simple processors ("Neurons")
4.1 Layering Structure
A neural network has three layers in its structure.
 First layer is input layer which is directly interact with external worlds
 Second layer is of hidden unit where computation is done according to function
provided
 Last layer is output layer from where we get output.[4]
Layer 2
(Hidden layer)
Layer 1 Layer 3
(Input layer) (Output layer)
4.2 Applications of Neural Network
 Facial Recognition
 Real-Time translation

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4.3 Explanation
Neural Network form the base of deep learning, a subfield of machine learning where
algorithms are inspired by the structure of human brain. Neural Networks take in data and train
themselves to recognize the patterns in this data and then predict the outputs.
4.3.1 Back propagation
Backpropagation is the essence of neural network training. It is the method of fine-tuning the
weights of a neural network based on the error rate obtained in the previous epoch (i.e.,
iteration). Proper tuning of the weights allows you to reduce error rates and make the model
reliable by increasing its generalization.
The back propagation (BP) neural network algorithm is a multi-layer feedforward network
trained according to error back propagation algorithm and is one of the most widely applied
neural network models. BP network can be used to learn and store a great deal of mapping
relations of input-output model, and no need to disclose in advance the mathematical equation
that describes these mapping relations. Its learning rule is to adopt the steepest descent
method in which the back propagation is used to regulate the weight value and threshold
value of the network to achieve the minimum error sum of square.[2]

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4.4 How Neural Network actually works?
b1
W1
Wa b2
x1 Wb W2
Wc
Wx b3 W3
x2 Wy
Wz
V1=f (WaU1+WxU2+b1)
V2=f (WbU1+WyU2+b2)
V3=f (WcU1+WzU2+b3)
U1
U2 V3
V2
V1

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5. References
[1] https://www.mygreatlearning.com/blog/what-is-artificial-intelligence/
[2] https://www.ibm.com/cloud/learn/neural-networks
[3] https://www.expert.ai/blog/machine-learning-definition/
[4] Kumar, K. and Thakur, G.S.M., 2012. Advanced applications of neural networks and
artificial intelligence: A review. International journal of information technology and computer
science, 4(6), p.57.
[5] Li, J., Cheng, J.H., Shi, J.Y. and Huang, F., 2012. Brief introduction of back propagation
(BP) neural network algorithm and its improvement. In Advances in computer science and
information engineering (pp. 553-558). Springer, Berlin, Heidelberg.