What are Neural Networks?

A neural network is the basic building block of any artificial or generative AI model. Layers of connected neurons make up neural networks, and these networks learn by varying the weights of the connections among the neurons. To put it simply, it is computer systems mimicking the human brain.

Why Neural Networks?

Since we want the machines to behave like humans, we would want the machines to have a part similar like human brain. Human brain has neural cells which communicate with each other to give messages to the hypothalamus.

Similarly, to imitate the human like communication neural networks are formed artificially. Neural networks are also trained with data to behave like human brain.

Google Search Algorithm is one of the most used neural networks.

It is like wherever AI is present, neural networks are present.

Working of Neural Network

An array of nodes makes up a neural network. There are at least three layers in which the nodes are dispersed.

There are three layers:

  • Input Layer
  • Hidden Layer
  • Output Layer
Working of Neural Network

These three layers are the bare minimum. A neural network can have multiple hidden layers in addition to the input and output layers.

Each node, regardless of the layer it belongs to, processes the input it receives from the preceding node (or from the input layer) in some way. In essence, every node has a mathematical formula with distinct weights assigned to each of its variables. The node moves data to the next if the result of using that mathematical formula on the input is greater than a predetermined threshold. If the output is below the threshold, then no data will be transmitted to the next layer.

Types of Neural Networks

There are neural network classifications on -

  • Classified on Depth
  • General classification

Classified on Depth

Shallow - These neural networks usually have one hidden layer

Deep - These neural networks have more than one hidden layer.

General Classification

  1. Artificial Neural Networks (ANNs) are neural networks with several hidden layers. Standard artificial neural networks are composed of multiple interconnected processing nodes, or neurons, that exchange information with one another via synapses. Each neuron, or node, in a typical neural network takes input from a number of other neurons and generates an output that is then transmitted to other neurons in the network.
  2. CNNs, or convolutional neural networks: are a particular kind of neural network that work well for tasks involving the classification of images. CNNs operate by applying a number of filters to an image that is intended to identify one or more particular characteristics.
  3. Recurrent neural network (RNN): RNNs are a type of deep neural network that can perform sequential processing on data by storing and forwarding information from earlier calculations. A particular kind of neural network in which the fresh input and the output from the previous timestep are used as input for the current timestep.
  4. Long short-term memory, or LSTM: is a type of deep neural network that has the capacity to store data for extended periods of time. As a result, it can gain knowledge from encounters spanning numerous time steps. An artificial neural network type called LSTM is utilized to analyze sequential data.
  5. Multi-Layer Perceptrons: Perceptrons are stacked in linked layers to form a multi-layered perceptron (MLP). The input layer gathers patterns entered. The output layer may use input patterns to map to output signals or classifications.
  6. Feed Forward Neural Networks: One of the more basic varieties of neural networks is feed-forward neural networks. Through the input nodes, information is transmitted in a single path, where it is processed until it reaches the output mode. The most common application for feed-forward neural networks is in facial recognition technology. These networks may contain hidden layers for functionality.

Use Cases of Neural Networks

One of the most known uses is generative AI. Generative AI models implement neural networks as their base models. Other applications are -

Image Classification

Real world image classification like classifying images with humans, or objects. The various applications may include X-Ray, CT-scan, MRI, image tagging or surveillance.

Weather Prediction

Using RNNs to predict the weather. A time-series based data is used so CNNs or RNNs can be used.

Speech Recognition

Deep learning models like neural networks are used in speech recognition. The input data can be audio or video, and the output can be a text transcript.

Face Recognition

Deep-learning neural networks have become a viable option for face recognition. When compared to previous machine learning algorithms and methodologies, deep neural network models have significantly improved accuracy levels and provide a workable solution for the picture categorization problem.

Self-Driving Cars

To create a variety of models that can be utilized for autonomous driving, a custom neural network architecture made up of CNN, ANN, etc., would be needed.

Wrapping up

From having an idea of “a thinking machine” to “generative AI” and AI making decisions , and recognitions. With so much progress made, the future of neural networks is bright. With more advancements and newer innovations, the application of neural networks will become more apt and widespread.

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