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Advanced Machine Learning with scikit-learn: Imbalanced classification and text data

Part 4 of 4

Other parts:

• Part 1
• Part 2
• Part 3

Content

• Working with imbalanced data
• Feature selection
• Working with Text Data
• Building custom estimators and extending scikit-learn

Instructor

• Andreas Mueller @amuellerml - Columbia University; Book: Introduction to Machine Learning with Python

This repository will contain the teaching material and other info associated with the workshop "Advanced Machine Learning with scikit-learn Part II/II".

Please download the Large Movie Review dataset from http://ai.stanford.edu/~amaas/data/sentiment/ before coming to the workshop!

About the workshop

Scikit-learn is a machine learning library in Python, that has become a valuable tool for many data science practitioners. This training will cover some advanced topics in using scikit-learn and how to build your own models or feature extraction methods that are compatible with scikit-learn. We will also discuss different approaches to feature selection, and resampling methods for imbalanced data. Finally, we'll discuss how to do classification of text data using the bag-of-words model and its variants.

Prerequisites

This workshop assumes familiarity with Jupyter notebooks and basics of pandas, matplotlib and numpy. It also assumes experience using scikit-learn and familiarity with the API.

Obtaining the Tutorial Material

If you are familiar with git, it is most convenient if you clone the GitHub repository. This is highly encouraged as it allows you to easily synchronize any changes to the material.

git clone https://github.com/amueller/ml-workshop-4-of-4

If you are not familiar with git, you can download the repository as a .zip file by heading over to the GitHub repository (https://github.com/amueller/ml-workshop-4-of-4) in your browser and click the green “Download” button in the upper right.

Please note that I may add and improve the material until shortly before the tutorial session, and we recommend you to update your copy of the materials one day before the tutorials. If you have an GitHub account and forked/cloned the repository via GitHub, you can sync your existing fork with via the following commands:

git pull origin master

Installation Notes

This tutorial will require recent installations of

• NumPy
• SciPy
• matplotlib
• pillow
• pandas
• scikit-learn (>=0.22.1)
• IPython
• Jupyter Notebook
• mlxtend
• imbalance-learn

The last one is important, you should be able to type:

jupyter notebook

in your terminal window and see the notebook panel load in your web browser. Try opening and running a notebook from the material to see check that it works.

For users who do not yet have these packages installed, a relatively painless way to install all the requirements is to use a Python distribution such as Anaconda, which includes the most relevant Python packages for science, math, engineering, and data analysis; Anaconda can be downloaded and installed for free including commercial use and redistribution. The code examples in this tutorial requires Python 3.5 or later.

After obtaining the material, we strongly recommend you to open and execute a Jupyter Notebook jupter notebook check_env.ipynb that is located at the top level of this repository. Inside the repository, you can open the notebook by executing

jupyter notebook check_env.ipynb

inside this repository. Inside the Notebook, you can run the code cell by clicking on the "Run Cells" button as illustrated in the figure below:

Finally, if your environment satisfies the requirements for the tutorials, the executed code cell will produce an output message as shown below: