freeCodeCamp/curriculum/challenges/english/11-machine-learning-with-python/tensorflow/neural-networks-activation-functions.md

---
id: 5e8f2f13c4cdbe86b5c72d93
title: 'Neural Networks: Activation Functions'
challengeType: 11
videoId: S45tqW6BqRs
bilibiliIds:
  aid: 675610466
  bvid: BV1wU4y1A7TJ
  cid: 409130203
dashedName: neural-networks-activation-functions
---

# --question--

## --text--

Which activation function switches values between -1 and 1?

## --answers--

ReLU (Rectified Linear Unit)

---

Tanh (Hyperbolic Tangent)

---

Sigmoid

## --video-solution--

2
add tensorflow course without questions (#38525) 2020-04-21 11:19:42 -04:00			`---`
			`id: 5e8f2f13c4cdbe86b5c72d93`
fix: rename tensorflow lessons (#38617) 2020-04-24 05:52:42 -05:00			`title: 'Neural Networks: Activation Functions'`
add tensorflow course without questions (#38525) 2020-04-21 11:19:42 -04:00			`challengeType: 11`
			`videoId: S45tqW6BqRs`
feat(i18n,curriculum): add Bilibili ids for Chinese (#43564) Co-authored-by: Kristofer Koishigawa <scissorsneedfoodtoo@gmail.com> Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> 2021-10-01 12:24:12 +08:00			`bilibiliIds:`
			`aid: 675610466`
			`bvid: BV1wU4y1A7TJ`
			`cid: 409130203`
feat(curriculum): restore seed + solution to Chinese (#40683) * feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com> 2021-01-13 03:31:00 +01:00			`dashedName: neural-networks-activation-functions`
add tensorflow course without questions (#38525) 2020-04-21 11:19:42 -04:00			`---`

Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format. 2020-11-27 19:02:05 +01:00			`# --question--`

			`## --text--`

			`Which activation function switches values between -1 and 1?`

			`## --answers--`

			`ReLU (Rectified Linear Unit)`

			`---`

			`Tanh (Hyperbolic Tangent)`

			`---`

			`Sigmoid`

			`## --video-solution--`

			`2`