ML Tutorial Style Guide Review

[DerekMelchin]

Expected Behavior

The tutorials in Research Environment > Machine Learning follow the rules in the style guide

• [x] Keras
• [ ] TensorFlow
• [x] Scikit-Learn
• [x] Hmmlearn
• [x] Gplearn
• [x] PyTorch
• [ ] Stable Baselines
• [ ] Tslearn
• [ ] XGBoost
• [ ] Aesear

Actual Behavior

Some of the tutorials violate the style guide.

Checklist

• [x] I have completely filled out this template
• [x] I have confirmed that this issue exists on the current master branch
• [x] I have confirmed that this is not a duplicate issue by searching issues