Book Image

The Unsupervised Learning Workshop

By : Aaron Jones, Christopher Kruger, Benjamin Johnston
Book Image

The Unsupervised Learning Workshop

By: Aaron Jones, Christopher Kruger, Benjamin Johnston

Overview of this book

Do you find it difficult to understand how popular companies like WhatsApp and Amazon find valuable insights from large amounts of unorganized data? The Unsupervised Learning Workshop will give you the confidence to deal with cluttered and unlabeled datasets, using unsupervised algorithms in an easy and interactive manner. The book starts by introducing the most popular clustering algorithms of unsupervised learning. You'll find out how hierarchical clustering differs from k-means, along with understanding how to apply DBSCAN to highly complex and noisy data. Moving ahead, you'll use autoencoders for efficient data encoding. As you progress, you’ll use t-SNE models to extract high-dimensional information into a lower dimension for better visualization, in addition to working with topic modeling for implementing natural language processing (NLP). In later chapters, you’ll find key relationships between customers and businesses using Market Basket Analysis, before going on to use Hotspot Analysis for estimating the population density of an area. By the end of this book, you’ll be equipped with the skills you need to apply unsupervised algorithms on cluttered datasets to find useful patterns and insights.
Table of Contents (11 chapters)
Preface

5. Autoencoders

Activity 5.01: The MNIST Neural Network

Solution:

In this activity, you will train a neural network to identify images in the MNIST dataset and reinforce your skills in training neural networks:

  1. Import pickle, numpy, matplotlib, and the Sequential and Dense classes from Keras:
    import pickle
    import numpy as np
    import matplotlib.pyplot as plt
    from keras.models import Sequential
    from keras.layers import Dense
    import tensorflow.python.util.deprecation as deprecation
    deprecation._PRINT_DEPRECATION_WARNINGS = False
  2. Load the mnist.pkl file, which contains the first 10,000 images and corresponding labels from the MNIST dataset that are available in the accompanying source code. The MNIST dataset is a series of 28 x 28 grayscale images of handwritten digits 0 through 9. Extract the images and labels:
    with open('mnist.pkl', 'rb') as f:
        data = pickle.load(f)
    images = data['images']
    labels = data['labels...