Improve the notebook.

[ruddyscent]

• Insert listing numbers for the better contents retrival.
• Limit lines of print out. Too long output makes Jupyter notebook slow. Also, it helps users navigate content easily.
• Ehance the training speed of the logistic regression model.
• Modify the input and output shape of the logistic regression model. Rows for samples, Columns for features.
• Add early stopping to the softmax model. Also, adjust hyperparameters of the softmax model to shortten the training time.