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Coursera Machine Learning Assignments in Python

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About

If you've finished the amazing introductory Machine Learning on Coursera by Prof. Andrew Ng, you probably got familiar with Octave/Matlab programming. With this repo, you can re-implement them in Python, step-by-step, visually checking your work along the way, just as the course assignments.

How to start

Dependencies

This project was coded in Python 3.6

  • numpy
  • matplotlib
  • scipy
  • scikit-learn
  • scikit-image
  • nltk

Installation

The fastest and easiest way to install all these dependencies at once is to use Anaconda.

Important Note

There are a couple of things to keep in mind before starting.

  • all column vectors from octave/matlab are flattened into a simple 1-dimensional ndarray. (e.g., y's and thetas are no longer m x 1 matrix, just a 1-d ndarray with m elements.) So in Octave/Matlab,
    >> size(theta)
    >> (2, 1)
    
    Now, it is
    >>> theta.shape
    >>> (2, )
    
  • numpy.matrix is never used, just plain ol' numpy.ndarray

Contents

Exercise 1

  • Linear Regression
  • Linear Regression with multiple variables

Exercise 2

  • Logistic Regression
  • Logistic Regression with Regularization

Exercise 3

  • Multiclass Classification
  • Neural Networks Prediction fuction

Exercise 4

  • Neural Networks Learning

Exercise 5

  • Regularized Linear Regression
  • Bias vs. Variance

Exercise 6

  • Support Vector Machines
  • Spam email Classifier

Exercise 7

  • K-means Clustering
  • Principal Component Analysis

Exercise 8

  • Anomaly Detection
  • Recommender Systems

Solutions

You can check out my implementation of the assignments here. I tried to vectorize all the solutions.



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