# BeyondYourself / coursera-ml-py

Python programming assignments for Machine Learning by Prof. Andrew Ng in Coursera

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# Coursera Machine Learning Assignments in Python

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.