book

The Unsupervised Learning Workshop

Name: The Unsupervised Learning Workshop
ISBN: 9781800200708

by Aaron Jones, Christopher Kruger, Benjamin Johnston, Richard Brooker, John Wesley Doyle, Priyanjit Ghosh, Sani Kamal, Ashish Pratik Patil, Philip Solomon, Geetank Raipuria

July 2020

Intermediate to advanced

550 pages

9h 58m

English

Packt Publishing

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The Unsupervised Learning Workshop
Preface
About the BookAudienceAbout the ChaptersConventionsCode PresentationSetting up Your EnvironmentHardware RequirementsInstalling PythonInstalling Python on WindowsInstalling Python on LinuxInstalling Python on macOSInstalling pipInstalling Anaconda Installing Anaconda on WindowsInstalling Anaconda on LinuxInstalling Anaconda on macOS XSetting up a Virtual EnvironmentInstalling LibrariesSetting up the MachineAccessing the Code Files
1. Introduction to Clustering
IntroductionUnsupervised Learning versus Supervised LearningClusteringIdentifying ClustersTwo-Dimensional DataExercise 1.01: Identifying Clusters in DataIntroduction to k-means ClusteringNo-Math k-means WalkthroughK-means Clustering In-Depth Walkthrough Alternative Distance Metric – Manhattan DistanceDeeper DimensionsExercise 1.02: Calculating Euclidean Distance in PythonExercise 1.03: Forming Clusters with the Notion of DistanceExercise 1.04: K-means from Scratch – Part 1: Data GenerationExercise 1.05: K-means from Scratch – Part 2: Implementing k-meansClustering Performance – Silhouette ScoreExercise 1.06: Calculating the Silhouette ScoreActivity 1.01: Implementing k-means ClusteringSummary
2. Hierarchical Clustering
IntroductionClustering RefresherThe k-means RefresherThe Organization of the HierarchyIntroduction to Hierarchical ClusteringSteps to Perform Hierarchical ClusteringAn Example Walkthrough of Hierarchical ClusteringExercise 2.01: Building a HierarchyLinkageExercise 2.02: Applying Linkage CriteriaAgglomerative versus Divisive ClusteringExercise 2.03: Implementing Agglomerative Clustering with scikit-learnActivity 2.01: Comparing k-means with Hierarchical Clusteringk-means versus Hierarchical ClusteringSummary
3. Neighborhood Approaches and DBSCAN
IntroductionClusters as NeighborhoodsIntroduction to DBSCANDBSCAN in DetailWalkthrough of the DBSCAN AlgorithmExercise 3.01: Evaluating the Impact of Neighborhood Radius SizeDBSCAN Attributes – Neighborhood RadiusActivity 3.01: Implementing DBSCAN from ScratchDBSCAN Attributes – Minimum PointsExercise 3.02: Evaluating the Impact of the Minimum Points ThresholdActivity 3.02: Comparing DBSCAN with k-means and Hierarchical ClusteringDBSCAN versus k-means and Hierarchical ClusteringSummary
4. Dimensionality Reduction Techniques and PCA
IntroductionWhat Is Dimensionality Reduction?Applications of Dimensionality ReductionThe Curse of DimensionalityOverview of Dimensionality Reduction TechniquesDimensionality ReductionPrincipal Component AnalysisMeanStandard DeviationCovarianceCovariance MatrixExercise 4.01: Computing Mean, Standard Deviation, and Variance Using the pandas LibraryEigenvalues and EigenvectorsExercise 4.02: Computing Eigenvalues and EigenvectorsThe Process of PCAExercise 4.03: Manually Executing PCAExercise 4.04: scikit-learn PCAActivity 4.01: Manual PCA versus scikit-learnRestoring the Compressed DatasetExercise 4.05: Visualizing Variance Reduction with Manual PCAExercise 4.06: Visualizing Variance Reduction with scikit-learnExercise 4.07: Plotting 3D Plots in MatplotlibActivity 4.02: PCA Using the Expanded Seeds DatasetSummary
5. Autoencoders
IntroductionFundamentals of Artificial Neural NetworksThe NeuronThe Sigmoid FunctionRectified Linear Unit (ReLU)Exercise 5.01: Modeling the Neurons of an Artificial Neural NetworkExercise 5.02: Modeling Neurons with the ReLU Activation FunctionNeural Networks: Architecture DefinitionExercise 5.03: Defining a Keras ModelNeural Networks: TrainingExercise 5.04: Training a Keras Neural Network ModelActivity 5.01: The MNIST Neural NetworkAutoencodersExercise 5.05: Simple AutoencoderActivity 5.02: Simple MNIST AutoencoderExercise 5.06: Multi-Layer AutoencoderConvolutional Neural NetworksExercise 5.07: Convolutional AutoencoderActivity 5.03: MNIST Convolutional AutoencoderSummary
6. t-Distributed Stochastic Neighbor Embedding
IntroductionThe MNIST DatasetStochastic Neighbor Embedding (SNE)t-Distributed SNEExercise 6.01: t-SNE MNISTActivity 6.01: Wine t-SNEInterpreting t-SNE PlotsPerplexityExercise 6.02: t-SNE MNIST and PerplexityActivity 6.02: t-SNE Wine and PerplexityIterationsExercise 6.03: t-SNE MNIST and IterationsActivity 6.03: t-SNE Wine and IterationsFinal Thoughts on VisualizationsSummary
7. Topic Modeling
IntroductionTopic ModelsExercise 7.01: Setting up the EnvironmentA High-Level Overview of Topic ModelsBusiness ApplicationsExercise 7.02: Data LoadingCleaning Text DataData Cleaning TechniquesExercise 7.03: Cleaning Data Step by StepExercise 7.04: Complete Data CleaningActivity 7.01: Loading and Cleaning Twitter DataLatent Dirichlet AllocationVariational InferenceBag of WordsExercise 7.05: Creating a Bag-of-Words Model Using the Count VectorizerPerplexityExercise 7.06: Selecting the Number of TopicsExercise 7.07: Running LDAVisualizationExercise 7.08: Visualizing LDAExercise 7.09: Trying Four TopicsActivity 7.02: LDA and Health TweetsExercise 7.10: Creating a Bag-of-Words Model Using TF-IDFNon-Negative Matrix FactorizationThe Frobenius NormThe Multiplicative Update AlgorithmExercise 7.11: Non-negative Matrix FactorizationExercise 7.12: Visualizing NMFActivity 7.03: Non-negative Matrix FactorizationSummary
8. Market Basket Analysis
IntroductionMarket Basket AnalysisUse CasesImportant Probabilistic MetricsExercise 8.01: Creating Sample Transaction DataSupportConfidenceLift and LeverageConvictionExercise 8.02: Computing MetricsCharacteristics of Transaction DataExercise 8.03: Loading DataData Cleaning and FormattingExercise 8.04: Data Cleaning and FormattingData EncodingExercise 8.05: Data EncodingActivity 8.01: Loading and Preparing Full Online Retail DataThe Apriori AlgorithmComputational FixesExercise 8.06: Executing the Apriori AlgorithmActivity 8.02: Running the Apriori Algorithm on the Complete Online Retail DatasetAssociation RulesExercise 8.07: Deriving Association RulesActivity 8.03: Finding the Association Rules on the Complete Online Retail DatasetSummary

9. Hotspot Analysis
IntroductionSpatial StatisticsProbability Density FunctionsUsing Hotspot Analysis in BusinessKernel Density EstimationThe Bandwidth ValueExercise 9.01: The Effect of the Bandwidth ValueSelecting the Optimal BandwidthExercise 9.02: Selecting the Optimal Bandwidth Using Grid SearchKernel FunctionsExercise 9.03: The Effect of the Kernel FunctionKernel Density Estimation DerivationExercise 9.04: Simulating the Derivation of Kernel Density EstimationActivity 9.01: Estimating Density in One DimensionHotspot AnalysisExercise 9.05: Loading Data and Modeling with SeabornExercise 9.06: Working with BasemapsActivity 9.02: Analyzing Crime in LondonSummary
Appendix
1. Introduction to ClusteringActivity 1.01: Implementing k-means Clustering2. Hierarchical ClusteringActivity 2.01: Comparing k-means with Hierarchical Clustering3. Neighborhood Approaches and DBSCANActivity 3.01: Implementing DBSCAN from ScratchActivity 3.02: Comparing DBSCAN with k-means and Hierarchical Clustering4. Dimensionality Reduction Techniques and PCAActivity 4.01: Manual PCA versus scikit-learnActivity 4.02: PCA Using the Expanded Seeds Dataset5. AutoencodersActivity 5.01: The MNIST Neural NetworkActivity 5.02: Simple MNIST AutoencoderActivity 5.03: MNIST Convolutional Autoencoder6. t-Distributed Stochastic Neighbor EmbeddingActivity 6.01: Wine t-SNEActivity 6.02: t-SNE Wine and PerplexityActivity 6.03: t-SNE Wine and Iterations7. Topic ModelingActivity 7.01: Loading and Cleaning Twitter DataActivity 7.02: LDA and Health TweetsActivity 7.03: Non-negative Matrix Factorization8. Market Basket AnalysisActivity 8.01: Loading and Preparing Full Online Retail DataActivity 8.02: Running the Apriori Algorithm on the Complete Online Retail DatasetActivity 8.03: Finding the Association Rules on the Complete Online Retail Dataset9. Hotspot AnalysisActivity 9.01: Estimating Density in One DimensionActivity 9.02: Analyzing Crime in London

Content preview from The Unsupervised Learning Workshop

7. Topic Modeling

Overview

In this chapter, we will perform basic cleaning techniques for textual data and then model the cleaned data to derive relevant topics. You will evaluate Latent Dirichlet Allocation (LDA) models and execute non-negative matrix factorization (NMF) models. Finally, you will interpret the results of topic models and identify the best topic model for the given scenario. We will see how topic modeling provides insights into the underlying structure of documents. By the end of this chapter, you will be able to build fully functioning topic models to derive value and insights for your business.

Introduction

In the last chapter, the discussion focused on preparing data for modeling using dimensionality reduction and autoencoding. ...

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The Supervised Learning Workshop - Second Edition

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The Unsupervised Learning Workshop

by Aaron Jones, Christopher Kruger, Benjamin Johnston, Richard Brooker, John Wesley Doyle, Priyanjit Ghosh, Sani Kamal, Ashish Pratik Patil, Philip Solomon, Geetank Raipuria

7. Topic Modeling

Introduction

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