# W1A3: nbgrader-part fails 60/100 with "Tests failed on 1 cell(s)!"

**URL:** <https://community.deeplearning.ai/t/w1a3-nbgrader-part-fails-60-100-with-tests-failed-on-1-cell-s/882275>\
**Category:** Improving Deep Neural Networks: Hyperparameter tun\
**Tags:** week-module-1\
**Created:** [October 27, 2025, 10:02pm UTC](https://community.deeplearning.ai/t/w1a3-nbgrader-part-fails-60-100-with-tests-failed-on-1-cell-s/882275 "2025-10-27T22:02:15Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![paulinpaloalto](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/paulinpaloalto/32/187_2.png) [@paulinpaloalto](https://community.deeplearning.ai/u/paulinpaloalto)\
**Post date:** [October 27, 2025, 11:08pm UTC](https://community.deeplearning.ai/t/w1a3-nbgrader-part-fails-60-100-with-tests-failed-on-1-cell-s/882275/2 "2025-10-27T23:08:22Z")

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[Here’s another thread](https://community.deeplearning.ai/t/gradient-checking-w1a3-grader-stuck-at-60-local-validation-passes-please-clear-cache/842665) that describes an error on that assignment that produces that behavior. Definitely worth a look. The overall point is that you don’t need to do any type coercion on the difference value that you are computing.

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