Programming Assignment 2a:
Use Python
The file name is “lr.py”
After running, I provide a plot to show which column is with the lowest error rate. 

Programming Assignment 2b:
Use Python
The file name is “kNN.py”
The code is divided into 2 parts. 
The first part is dealing with crx data. 
And 2 files “crx_training_processed” and “crx_testing_processed” will be generated(with new labels). 
The accuracy will be showed in command lines.

The secondpart is dealing with lenses data. 
new labels will be added into the “lense.output” file. 
And the accuracy will be showed in command lines.