Update kmeans.py

Merge pull request #4 from cclauss/modernize-Python-2-codes

Use print() function in both Python 2 and Python 3

added gradient descent illustration

Added two more illustrations

Added ATTRIBUTION.txt

Added illustrations and code tognerate them

Create data.txt

Update README.md

Create vector.py

Create under_over_fitting.py

Create UMAP_MNIST.py

Create standard_logistic_function.py

Create prediction_strength.py

Create pmf.py