# DLS 2 Week 1 Programming Assignment 2 - About Notation **URL:** \ **Category:** Improving Deep Neural Networks: Hyperparameter tun\ **Tags:** coursera-platform\ **Created:** [August 10, 2021, 4:02pm UTC](https://community.deeplearning.ai/t/dls-2-week-1-programming-assignment-2-about-notation/26480 "2021-08-10T16:02:27Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![PBenavides](https://avatars.discourse-cdn.com/v4/letter/p/22d042/32.png) [@PBenavides](https://community.deeplearning.ai/u/PBenavides)\ **Post date:** [August 10, 2021, 4:02pm UTC](https://community.deeplearning.ai/t/dls-2-week-1-programming-assignment-2-about-notation/26480/1 "2021-08-10T16:02:27Z")
Hi! I need some clarification about the Regularization equation. I’m trying to learn the math procedure but I’m confused about the notation of the 5.2 equation on the Notebook. What do k and j refer to on the Regularization part? Also, the ^2 is confusing, but I know is an exponential weight. ![image](https://global.discourse-cdn.com/dlai/original/2X/4/4df7ad01ecfbacedce112bdeb2edc7be21de6ac8.png) Thanks in advance for the answer! ---
**Author:** ![jonaslalin](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/jonaslalin/32/63_2.png) [@jonaslalin](https://community.deeplearning.ai/u/jonaslalin)\ **Post date:** [August 10, 2021, 7:42pm UTC](https://community.deeplearning.ai/t/dls-2-week-1-programming-assignment-2-about-notation/26480/2 "2021-08-10T19:42:44Z")
Have a look at Prof Andrew Ng’s lecture: > **[Regularization - Practical Aspects of Deep Learning | Coursera](https://www.coursera.org/lecture/deep-neural-network/regularization-Srsrc)** > > Video created by DeepLearning.AI for the course "Improving Deep Neural Networks: Hyperparameter Tuning, Regularization and Optimization". Discover and experiment with a variety of different initialization methods, apply L2 regularization and ... Your question is covered around the 5 minute mark.