# What is: Lecun's Tanh?

Year | 1998 |

Data Source | CC BY-SA - https://paperswithcode.com |

**LeCun's tanh** is an activation function of the form $f\left(x\right) = 1.7159\tanh\left(\frac{2}{3}x\right)$. The constants were chosen to keep the variance of the output close to 1.