## Is backpropagation stochastic gradient descent?

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Stochastic gradient descent is an optimization algorithm for minimizing the loss of a predictive model with regard to a training dataset. Back-propagation is an automatic differentiation algorithm for calculating gradients for the weights in a neural network graph structure.

## Is backpropagation and gradient descent same?

Back-propagation is the process of calculating the derivatives and gradient descent is the process of descending through the gradient, i.e. adjusting the parameters of the model to go down through the loss function.

**How do we calculate gradient for back-propagation?**

Backpropagation is an algorithm used in machine learning that works by calculating the gradient of the loss function, which points us in the direction of the value that minimizes the loss function. It relies on the chain rule of calculus to calculate the gradient backward through the layers of a neural network.

### Does SGD use backpropagation?

Backpropagation is an efficient technique to compute this “gradient” that SGD uses.

### What is the difference between backpropagation and forward propagation?

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 the difference between stochastic gradient descent and gradient descent?**

In Gradient Descent, we consider all the points in calculating loss and derivative, while in Stochastic gradient descent, we use single point in loss function and its derivative randomly.

#### Does backpropagation learning is based on gradient?

9. Does backpropagaion learning is based on gradient descent along error surface? Explanation: Weight adjustment is proportional to negative gradient of error with respect to weight.

#### What is local gradient in backpropagation?

Local gradients of a node are the derivatives of the output of the node with respect to each of the inputs. Local gradients of the nodes in the computational graph. We have marked the outputs on the graph and have also calculated the local gradients of the nodes.

**Is backpropagation slower than forward propagation?**

We see that the learning phase (backpropagation) is slower than the inference phase (forward propagation). This is even more pronounced by the fact that gradient descent often has to be repeated many times.

## Why do we need backpropagation in neural network?

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.

## What are the four main steps in back-propagation algorithm?

Below are the steps involved in Backpropagation: Step – 1: Forward Propagation. Step – 2: Backward Propagation. Step – 3: Putting all the values together and calculating the updated weight value….The above network contains the following:

- two inputs.
- two hidden neurons.
- two output neurons.
- two biases.