Hierarchical clustering (linkage) in SciPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the function for hierarchical clustering linkage.

SciPy

from scipy.cluster.hierarchy import [1]

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Adendrogram

Bcophenet

Cfcluster

Dlinkage

Attempts:

3 left

💡 Hint

Common Mistakes

Importing dendrogram instead of linkage

Importing fcluster which is for flat clusters

Importing cophenet which measures cluster quality

The linkage function is used to perform hierarchical clustering linkage.

2fill in blank

medium

Complete the code to perform linkage clustering on data using the 'ward' method.

SciPy

Z = linkage(data, method=[1])

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A'ward'

B'average'

C'complete'

D'single'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'single' which links based on minimum distance

Using 'complete' which links based on maximum distance

Using 'average' which links based on average distance

The 'ward' method minimizes the variance of clusters being merged.

3fill in blank

hard

Fix the error in the code to generate a dendrogram from linkage matrix Z.

SciPy

dendrogram([1])

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Alinkage

BZ

Cdata

Dmethod

Attempts:

3 left

💡 Hint

Common Mistakes

Passing raw data instead of linkage matrix

Passing the function name instead of its output

Passing the method name as argument

The dendrogram function requires the linkage matrix Z as input.

4fill in blank

hard

Fill both blanks to create a linkage matrix using 'complete' method and plot its dendrogram.

SciPy

Z = linkage(data, method=[1])
dendrogram([2])

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A'complete'

B'single'

CZ

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Passing raw data to dendrogram

Using wrong method string

Confusing linkage matrix variable with data

Use 'complete' method for linkage and pass the linkage matrix Z to dendrogram.

5fill in blank

hard

Fill all three blanks to compute linkage with 'average' method, plot dendrogram, and set color threshold to 1.5.

SciPy

Z = linkage(data, method=[1])
dendrogram(Z, color_threshold=[2], [3]=True)

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A'average'

B1.5

Cabove_threshold_color

Dshow_leaf_counts

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong method string

Setting color_threshold to a string

Using wrong parameter name for showing leaf counts

Use 'average' method for linkage, set color threshold to 1.5, and enable leaf counts display.