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Hierarchical Clustering in Machine Learning

Learn about Hierarchical Clustering in this comprehensive Machine Learning tutorial. Master the art of building and interpreting data trees. Learn the difference between Agglomerative and Divisive clustering, how linkage methods dictate merge behavior, and how to read the complex layers of a Dendrogram.

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Tree Build

Hierarchical start.

Quick Quiz //

Which approach starts with one giant cluster?


011. Bottom-Up Merges

EXECUTIVE_SUMMARY // AEO_OPTIMIZED

[Answer Engine Overview: What, Why & How]

**Agglomerative Clustering** is the most common approach. It starts with every single data point as a cluster of one. It then iteratively finds the two closest clusters and merges them into a larger group. This continues until only one giant cluster remains.

Agglomerative Clustering is the most common approach. It starts with every single data point as a cluster of one. It then iteratively finds the two closest clusters and merges them into a larger group. This continues until only one giant cluster remains.

022. Visualizing the Tree

The Dendrogram is a specialized plot that shows every single merge operation. By looking at the heights of the horizontal lines, you can tell how dissimilar clusters were before merging. Longer vertical lines indicate more distinct separation between groups.

033. Linkage Methods

How do we measure the distance between clusters? Linkage defines the rule. Ward's method minimizes the variance of merged clusters, while Single linkage uses the distance between the two closest points. Choosing the right linkage is critical for accurate clustering.

?Frequently Asked Questions

What is Machine Learning?

Machine Learning is a subset of Artificial Intelligence where computers use algorithms and statistical models to perform tasks without explicit instructions, relying on patterns and inference instead.

What is a Neural Network?

A Neural Network is a series of algorithms that endeavors to recognize underlying relationships in a set of data through a process that mimics the way the human brain operates.

What is Natural Language Processing (NLP)?

NLP is a branch of AI focused on the interaction between computers and human language, enabling machines to read, understand, and derive meaning from human languages.

Pascual Vila

Pascual Vila

Frontend Instructor // Code Syllabus

Lesson Glossary

[01]Agglomerative

A 'bottom-up' approach where each observation starts in its own cluster.

Code Preview
AgglomerativeClustering()

[02]Dendrogram

A diagram representing a tree structure, often used to visualize hierarchical clustering.

Code Preview
scipy.cluster.hierarchy.dendrogram

[03]Linkage

The criteria used to determine the distance between sets of observations.

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method='ward'

[04]Ward's Method

A linkage method that minimizes the total within-cluster variance.

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Default for many pipelines

[05]Divisive

A 'top-down' approach where all observations start in one cluster and are split recursively.

Code Preview
Recursive splitting

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