---
id: 5e9a0e9ef99a403d019610ca
title: How Deep Neural Networks Work
challengeType: 11
videoId: zvalnHWGtx4
dashedName: how-deep-neural-networks-work
---

# --question--

## --text--

Why is it better to calculate the gradient (slope) directly rather than numerically?

## --answers--

It is computationally expensive to go back through the entire neural network and adjust the weights for each layer of the neural network.

---

It is more accurate.

---

There is no difference between the two methods.

## --video-solution--

1

