Refactoring DT Notebook Code.

[RahulVC02]

This PR is for issue #3 . I have added the following functions to make the code easier to follow-

1. create_DT_Regressor (used in the Real Input-Real Output case)
2. create_graph (uses graphviz and sklearn to draw the decision tree figure)
3. create_DT_Classifier (used in the Bias-Variance Tradeoff Demo)
4. create_DT_Classifier_with_graph (used in Bias-Variance Tradeoff Demo on Dataset II)

[review-notebook-app[bot]]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[nipunbatra]

Merged the PR. Thanks @RahulVC02

I had one minor comment on concatenating paths. Might be better to use f-strings or os.path.join

[nipunbatra]

@RahulVC02 can you add YAML with raw format as follows to this and all other notebooks?

This way, they render nicely https://nipunbatra.github.io/ml-teaching/notebooks.html#category=Tutorial

See in contrast: https://nipunbatra.github.io/ml-teaching/notebooks.html#category=

[RahulVC02]

@RahulVC02 can you add YAML with raw format as follows to this and all other notebooks?

This way, they render nicely https://nipunbatra.github.io/ml-teaching/notebooks.html#category=Tutorial

See in contrast: https://nipunbatra.github.io/ml-teaching/notebooks.html#category=

I have raised another PR incorporating these changes @nipunbatra Sir.