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Cluster Analysis in Python
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Kursusindhold

Cluster Analysis in Python

Cluster Analysis in Python

1. K-Means Algorithm
Exploratory Data AnalysisWhat is a K-Means Algorithm?Defining the Number of ClustersCase 1: Three Distinct ClustersCase 2: Four Distinct ClustersClustering Weather DataFebruary vs July Average TemperaturesVisualizing the Dynamics Across Clusters
2. K-Medoids Algorithm
What is a K-Medoids Algorithm?Cluster CentersSilhouette ScoresK-Medoids and the Weather DataMean Yearly Temperatures Across ClustersComparing the Dynamics
3. Hierarchical Clustering
What is a Hierarchical Clustering?DendrogramsSetting Parameters: LinkageRand IndexThe Weather Data and LinkagesDeciding the Number of ClustersWeather Data: Complete and Ward LinkagesHow Similar are the Results?
4. Spectral Clustering
What is a Spectral Clustering?Peculiarity of Spectral ClusteringSetting Parameters: AffinityDefining the Number of ClustersIs 4 the Optimal Number of Clusters?Comparing the Trends Across Clusters

book
The Weather Data and Linkages

Let's see how will the dendrograms with different linkage parameter values will look like for the weather data.

Note, that to explore the task's result you will need to scroll over the output block on the right and below.

Opgave

Swipe to start coding

Table

For the weather data stored in the data variable build the dendrograms for each of 4 types of linkage ('single', 'average', 'complete', and 'ward'. These are already stored in the linkages list). Follow the next steps:

  1. Import the functions needed:
  • AgglomerativeClustering from sklearn.cluster.
  • dendrogram and linkage from scipy.cluster.hierarchy.
  1. Iterate over the linkages list using the dummy variable link.
  2. Within the dist variable compute the distances using 3-14 (these are positions, not indices!) columns of data, and passing the method parameter to link.
  3. Build the dendrogram for dist, setting no_labels to True.

Løsning

Note, that you received four dendrograms in the console. To explore them scroll the console down.

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Sektion 3. Kapitel 5
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book
The Weather Data and Linkages

Let's see how will the dendrograms with different linkage parameter values will look like for the weather data.

Note, that to explore the task's result you will need to scroll over the output block on the right and below.

Opgave

Swipe to start coding

Table

For the weather data stored in the data variable build the dendrograms for each of 4 types of linkage ('single', 'average', 'complete', and 'ward'. These are already stored in the linkages list). Follow the next steps:

  1. Import the functions needed:
  • AgglomerativeClustering from sklearn.cluster.
  • dendrogram and linkage from scipy.cluster.hierarchy.
  1. Iterate over the linkages list using the dummy variable link.
  2. Within the dist variable compute the distances using 3-14 (these are positions, not indices!) columns of data, and passing the method parameter to link.
  3. Build the dendrogram for dist, setting no_labels to True.

Løsning

Note, that you received four dendrograms in the console. To explore them scroll the console down.

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 3. Kapitel 5
Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
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