Hierarchisches Clustering: single-Methode

Verwenden wir das gleiche Footfall-Dataset und prüfen, ob sich etwas ändert, wenn wir eine andere Methode für das Clustering verwenden.

Die Daten liegen in einem pandas-DataFrame comic_con. x_scaled und y_scaled sind die Spaltennamen der standardisierten X- und Y-Koordinaten von Personen zu einem bestimmten Zeitpunkt.

Diese Übung ist Teil des Kurses

<Kurs>Cluster Analysis in Python</Kurs>

Übungsanweisungen

Importiere fcluster und linkage aus scipy.cluster.hierarchy.
Verwende die Methode single in der Funktion linkage().

Interaktive praktische Übung

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# Import the fcluster and linkage functions
from ____ import ____, ____

# Use the linkage() function
distance_matrix = ____(comic_con[[____, ____]], ____ = ____, metric = ____)

# Assign cluster labels
comic_con['cluster_labels'] = ____(____, ____, ____)

# Plot clusters
sns.scatterplot(x='x_scaled', y='y_scaled', 
                hue='cluster_labels', data = comic_con)
plt.show()

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<Kurs>Cluster Analysis in Python</Kurs>

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Before you are ready to classify news articles, you need to be introduced to the basics of clustering. This chapter familiarizes you with a class of machine learning algorithms called unsupervised learning and then introduces you to clustering, one of the popular unsupervised learning algorithms. You will know about two popular clustering techniques - hierarchical clustering and k-means clustering. The chapter concludes with basic pre-processing steps before you start clustering data.

Exercise 1: Unsupervised learning: basics Exercise 2: Unsupervised learning in real world Exercise 3: Pokémon sightings Exercise 4: Basics of cluster analysis Exercise 5: Pokémon sightings: hierarchical clustering Exercise 6: Pokémon sightings: k-means clustering Exercise 7: Data preparation for cluster analysis Exercise 8: Normalize basic list data Exercise 9: Visualize normalized data Exercise 10: Normalization of small numbers Exercise 11: FIFA 18: Normalize data

This chapter focuses on a popular clustering algorithm - hierarchical clustering - and its implementation in SciPy. In addition to the procedure to perform hierarchical clustering, it attempts to help you answer an important question - how many clusters are present in your data? The chapter concludes with a discussion on the limitations of hierarchical clustering and discusses considerations while using hierarchical clustering.

Exercise 1: Grundlagen der hierarchischen Clusterbildung Exercise 2: Hierarchisches Clustering: Ward-Methode Exercise 3: Hierarchisches Clustering: single-Methode

Aktuelle Übung

Exercise 4: Hierarchisches Clustering: complete-Methode Exercise 5: Cluster visualisieren Exercise 6: Cluster mit matplotlib visualisieren Exercise 7: Cluster mit seaborn visualisieren Exercise 8: Wie viele Cluster?Exercise 9: Erstelle ein Dendrogramm Exercise 10: Wie viele Cluster gibt es in den Comic-Con-Daten?Exercise 11: Einschränkungen der hierarchischen Clusteranalyse Exercise 12: Laufzeitmessung bei hierarchischem Clustering Exercise 13: FIFA 18: Verteidiger erkunden

This chapter introduces a different clustering algorithm - k-means clustering - and its implementation in SciPy. K-means clustering overcomes the biggest drawback of hierarchical clustering that was discussed in the last chapter. As dendrograms are specific to hierarchical clustering, this chapter discusses one method to find the number of clusters before running k-means clustering. The chapter concludes with a discussion on the limitations of k-means clustering and discusses considerations while using this algorithm.

Exercise 1: Basics of k-means clustering Exercise 2: K-means clustering: first exercise Exercise 3: Runtime of k-means clustering Exercise 4: How many clusters?Exercise 5: Elbow method on distinct clusters Exercise 6: Elbow method on uniform data Exercise 7: Limitations of k-means clustering Exercise 8: Impact of seeds on distinct clusters Exercise 9: Uniform clustering patterns Exercise 10: FIFA 18: defenders revisited

Now that you are familiar with two of the most popular clustering techniques, this chapter helps you apply this knowledge to real-world problems. The chapter first discusses the process of finding dominant colors in an image, before moving on to the problem discussed in the introduction - clustering of news articles. The chapter concludes with a discussion on clustering with multiple variables, which makes it difficult to visualize all the data.

Exercise 1: Dominant colors in images Exercise 2: Extract RGB values from image Exercise 3: How many dominant colors?Exercise 4: Display dominant colors Exercise 5: Document clustering Exercise 6: TF-IDF of movie plots Exercise 7: Top terms in movie clusters Exercise 8: Clustering with multiple features Exercise 9: Clustering with many features Exercise 10: Basic checks on clusters Exercise 11: FIFA 18: what makes a complete player?Exercise 12: Farewell!