## What problem does backpropagation solve?

The goal of backpropagation is to optimize the weights so that the neural network can learn how to correctly map arbitrary inputs to outputs.

**What problem does backpropagation solve when working with neural networks?**

In fitting a neural network, backpropagation computes the gradient of the loss function with respect to the weights of the network for a single input–output example, and does so efficiently, unlike a naive direct computation of the gradient with respect to each weight individually.

### What are the different types of backpropagation networks?

There are two kinds of backpropagation networks. It is categorized as below: Static backpropagation is one type of network that aims in producing a mapping of a static input for static output. These kinds of networks are capable of solving static classification problems like optical character recognition (OCR).

**Is there an example of backpropagation in math?**

There is no shortage of papers online that attempt to explain how backpropagation works, but few that include an example with actual numbers. This post is my attempt to explain how it works with a concrete example that folks can compare their own calculations to in order to ensure they understand backpropagation correctly.

#### When do we use the loss function in backpropagation?

Once the model is stable, it is used in production. One or more variables are mapped to real numbers, which represent some price related to those values. Intended for backpropagation, the loss function calculates the difference between the network output and its probable output. Why do we need backpropagation?

**What’s the goal of a Backpropagation training set?**

The goal of backpropagation is to optimize the weights so that the neural network can learn how to correctly map arbitrary inputs to outputs. For the rest of this tutorial we’re going to work with a single training set: given inputs 0.05 and 0.10, we want the neural network to output 0.01 and 0.99.