# Excercise 3 (gradient\_check) function inside Gradient\_Checking does not work **URL:** \ **Category:** Improving Deep Neural Networks: Hyperparameter tun\ **Tags:** coursera-platform\ **Created:** [May 11, 2021, 5:50am UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666 "2021-05-11T05:50:02Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Hsadikot](https://avatars.discourse-cdn.com/v4/letter/h/a9adbd/32.png) [@Hsadikot](https://community.deeplearning.ai/u/Hsadikot)\ **Post date:** [May 11, 2021, 5:50am UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/1 "2021-05-11T05:50:02Z")
Hi, The details of the assignment are under: Week:Week1 Assignment: Programming Assignment: Gradient Checking For the above mentioned exercise notebook I am getting an error in gradient\_checking function. The error is as shown: ![error](https://global.discourse-cdn.com/dlai/original/1X/ce514407f0eb7c307b12719452af1c9f7a570f14.png) Due to this I am not getting the required credit and am failing this assignment This can be avoided if I reformat the code as following: ``` x, theta = 2, 4 difference = gradient_check(2,4, print_msg=True) gradient_check_test(gradient_check) ``` But I am unable to delete the original cell nor am I able to format it I tried to reset the notebook to its original state using checkpoints but am unable to find its original checkpoint Please help me to solve this issue Thanks ---
**Author:** ![Hsadikot](https://avatars.discourse-cdn.com/v4/letter/h/a9adbd/32.png) [@Hsadikot](https://community.deeplearning.ai/u/Hsadikot)\ **Post date:** [May 11, 2021, 10:05am UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/2 "2021-05-11T10:05:00Z")
Hi, I am still stuck on this only assignment for Week 1. Any assistance could be valuable ---
**Author:** ![Devanshu](https://avatars.discourse-cdn.com/v4/letter/d/ee59a6/32.png) [@Devanshu](https://community.deeplearning.ai/u/Devanshu)\ **Post date:** [May 11, 2021, 3:16pm UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/3 "2021-05-11T15:16:52Z")
Try running all the cells( even the ones in which you dont have to write code) ---
**Author:** ![javier](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/javier/32/47_2.png) [@javier](https://community.deeplearning.ai/u/javier)\ **Post date:** [May 11, 2021, 9:41pm UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/4 "2021-05-11T21:41:22Z")
Hi @Hsadikot , welcome to the DLS ! There is a subtle error in your code. Please look carefully at your code and the code provided for that exercise. ---
**Author:** ![Hsadikot](https://avatars.discourse-cdn.com/v4/letter/h/a9adbd/32.png) [@Hsadikot](https://community.deeplearning.ai/u/Hsadikot)\ **Post date:** [May 12, 2021, 4:45am UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/5 "2021-05-12T04:45:06Z")
Hi @javier I understand that there may be error in my code. But I am not allowed to edit that particular cell. Any way in which I can reset the notebook to its original condition ---
**Author:** ![Hsadikot](https://avatars.discourse-cdn.com/v4/letter/h/a9adbd/32.png) [@Hsadikot](https://community.deeplearning.ai/u/Hsadikot)\ **Post date:** [May 12, 2021, 5:52am UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/6 "2021-05-12T05:52:00Z")
Hi @Devanshu I execute each cells but I get the error ---
**Author:** ![javier](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/javier/32/47_2.png) [@javier](https://community.deeplearning.ai/u/javier)\ **Post date:** [May 12, 2021, 11:23pm UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/7 "2021-05-12T23:23:51Z")
Hi @Hsadikot , please send me by direct message the code of your gradient\_check function so i can take a look at it. ---
**Author:** ![nramon](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/nramon/32/129097_2.png) [@nramon](https://community.deeplearning.ai/u/nramon)\ **Post date:** [May 14, 2021, 8:50am UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/8 "2021-05-14T08:50:55Z")
Hi, @javier. I had already taken a look at the code. Sorry for not replying sooner. For other learners experiencing the same error, never write code outside these blocks: ```auto # YOUR CODE STARTS HERE # YOUR CODE ENDS HERE ``` ---
**Author:** ![javier](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/javier/32/47_2.png) [@javier](https://community.deeplearning.ai/u/javier)\ **Post date:** [May 14, 2021, 12:27pm UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/9 "2021-05-14T12:27:18Z")
Hey @nramon , at first I also thought that this was the case, but I looked at his implementation and it seemed that the notebook was an old version. I guided him to update the notebook to the latest release, and now it worked. ---
**Author:** ![nramon](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/nramon/32/129097_2.png) [@nramon](https://community.deeplearning.ai/u/nramon)\ **Post date:** [May 14, 2021, 12:33pm UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/10 "2021-05-14T12:33:42Z")
He did confirm it worked. Thanks, @javier 🙂 ---
**Author:** ![aleksandra16](https://avatars.discourse-cdn.com/v4/letter/a/9f8e36/32.png) [@aleksandra16](https://community.deeplearning.ai/u/aleksandra16)\ **Post date:** [July 29, 2022, 9:55am UTC](https://community.deeplearning.ai/t/excercise-3-gradient-check-function-inside-gradient-checking-does-not-work/4666/11 "2022-07-29T09:55:56Z")
To all having problem with difference equal to app. 0.9999: do not forget to add appropriate brackets in “gradapprox = …” line (in order to ensure the correct order of caluculations).