Clustering With Spark

Konur Unyelioglu shows how to implement k-means and Guassian clustering techniques in Apache Spark using MLlib:

Clustering is the task of assigning entities into groups based on similarities among those entities. The goal is to construct clusters in such a way that entities in one cluster are more closely related, i.e. similar to each other than entities in other clusters. As opposed to classification problems where the goal is to learn based on examples, clustering involves learning based on observation. For this reason, it is a form of unsupervised learning task.

There are many different clustering algorithms and a central notion in all of those is the definition of ’similarity’ between the entities that are being grouped. Different clustering algorithms may have different ways of measuring the similarity. In many clustering algorithms, another common notion is the so-called cluster center, which is a basis to represent the cluster. For example, in K-means clustering algorithm, the cluster center is the arithmetic mean position of all the points in that cluster.

This is a fairly lengthy article but if you want to get into machine learning with Spark, it’s a good one.

Related Posts

Unit Testing Spark Streaming DStreams

Anuj Saxena shows how to create unit tests for DStreams in Spark Streaming: The method ‘ testOperation ‘ takes the output of the operation performed on the ‘inputPair’ and check whether it is equal to the ‘outputPair’ and just like this, we can test our business logic. This short snippet lets you test your business logic without […]

Read More

Markov Chains In Python

Sandipan Dey shows off various uses of Markov chains as well as how to create one in Python: Perspective. In the 1948 landmark paper A Mathematical Theory of Communication, Claude Shannon founded the field of information theory and revolutionized the telecommunications industry, laying the groundwork for today’s Information Age. In this paper, Shannon proposed using a Markov chain to […]

Read More

Categories

July 2016
MTWTFSS
« Jun Aug »
 123
45678910
11121314151617
18192021222324
25262728293031