Contents

## Is neural network supervised or unsupervised?

supervised learning

Strictly speaking, a neural network (also called an “artificial neural network”) is a type of machine learning model that is usually used in **supervised learning**.

## What is neural network model?

A neural network is **a simplified model of the way the human brain processes information**. It works by simulating a large number of interconnected processing units that resemble abstract versions of neurons. The processing units are arranged in layers.

## What are the 3 components of the neural network?

What Are the Components of a Neural Network? There are three main components: **an input later, a processing layer, and an output layer**.

## What is the difference between CNN and DNN?

CNN uses a convolution operation which represents a particular filter whereas deep NN focuses more on how the information from input is represented via a bunch of nonlinear functions (pack of layers) before reaching the output layer.

## What is the difference between ANN and DNN?

Technically, **an artificial neural network (ANN) that has a lot of layers is a Deep Neural Network (DNN)**. In practice though, a deep neural network is just a normal neural network where the layers of the network are abstracted out, or a network that uses functions not typically found in an artificial neural network.

## How is neural network different from machine learning?

Machine Learning uses advanced algorithms that parse data, learns from it, and use those learnings to discover meaningful patterns of interest. Whereas **a Neural Network consists of an assortment of algorithms used in Machine Learning for data modelling using graphs of neurons**.

## Is neural network classification or regression?

Neural Networks are well known techniques for **classification problems**. They can also be applied to regression problems.

## Are all neural networks supervised?

**The learning algorithm of a neural network can either be supervised or unsupervised**. A neural net is said to learn supervised, if the desired output is already known.

## What are the learning rules in neural network?

Learning rule or Learning process is **a method or a mathematical logic**. It improves the Artificial Neural Network’s performance and applies this rule over the network. Thus learning rules updates the weights and bias levels of a network when a network simulates in a specific data environment.

## How neural networks are used in real life?

They are good for **Pattern Recognition, Classification and Optimization**. This includes handwriting recognition, face recognition, speech recognition, text translation, credit card fraud detection, medical diagnosis and solutions for huge amounts of data.

## How neural network principles are useful in control applications?

One of the most important applications of an artificial neural network is classification, which can be used in different digital signal processing applications such as **speech recognition, signal separation, and handwriting recognition and detection** [7].

## What are feedforward neural networks used for?

Feed-forward neural networks are used **to learn the relationship between independent variables, which serve as inputs to the network, and dependent variables that are designated as outputs of the network**.

## What is the difference between feedforward neural network and backpropagation?

Forward Propagation is the way to move from the Input layer (left) to the Output layer (right) in the neural network. The process of moving from the right to left i.e backward from the Output to the Input layer is called the Backward Propagation.

## What is single layer feedforward neural network?

Single-layer feed forward network

**In this type of network, we have only two layers input layer and output layer but the input layer does not count because no computation is performed in this layer**. The output layer is formed when different weights are applied on input nodes and the cumulative effect per node is taken.

## Is Delta Rule same as gradient descent?

**The delta rule is an update rule for single layer perceptrons.** **It makes use of gradient descent**. Backpropagation is an efficient implementation of gradient descent, where a rule can be formulated which has some recursively defined parts.

## Why do we need gradient descent and delta rule for neural network?

The key idea behind the delta rule is to use gradient descent **to search the hypothesis space of possible weight vectors** to find the search the hypothesis space of possible weight vectors to find the weights that best fit the training data.

## Which activation function Cannot be used for gradient descent?

Hence, **Threshold activation function** cannot be used in Gradient Descent learning. Whereas a Linear Activation function (or any other function that is differential) allows the derivative of the error to be calculated.

## What is true about delta rule?

The Delta rule in machine learning and neural network environments is **a specific type of backpropagation that helps to refine connectionist ML/AI networks, making connections between inputs and outputs with layers of artificial neurons**. The Delta rule is also known as the Delta learning rule.

## How the weights are updated in the delta rule based on?

Apply the weight update **∆wij = –η ∂E(wij)/∂wij** to each weight wij for each training pattern p. One set of updates of all the weights for all the training patterns is called one epoch of training.

## What is Delta in perception model of neuron?

4. What is delta (error) in perceptron model of neuron? Explanation: **All other parameters are assumed to be null while calculatin the error in perceptron model & only difference between desired & target output is taken into account**. 5.

## Why does the delta rule work?

The delta rule is a straight-forward application of gradient descent (i.e. hill climbing), and is easy to do because **in a neural network with a single hidden layer, the neurons have direct access to the error signal**. Detailed illustration of a single-layer neural network trainable with the delta rule.

## Under what conditions the perceptron rule fails and it becomes necessary to apply the delta rule?

Perceptrons only represent linearly separable problems. They fail to converge **if the training examples are not linearly separable**. This brings into picture the delta rule. The delta rule converges towards a best-fit approximation of the target concept.

## What is backpropagation used for?

Essentially, backpropagation is an algorithm used **to calculate derivatives quickly**. Artificial neural networks use backpropagation as a learning algorithm to compute a gradient descent with respect to weights.