> For the complete documentation index, see [llms.txt](https://fall2019.fullstackdeeplearning.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fall2019.fullstackdeeplearning.com/course-content/training-and-debugging/overview.md).

# Overview

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Overview - Troubleshooting
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## Summary

* A common sentiment among practitioners is that they spend 80–90% of time debugging and tuning the models, and only 10–20% of time deriving math equations and implementing things.
* Reproducing the results in deep learning can be challenging due to various factors including implementation bugs, choices of model hyper-parameters, data/model fit, and the construction of data.