Another Word For It Patrick Durusau on Topic Maps and Semantic Diversity

March 22, 2013

Cloudera ML:…

Filed under: Cloudera,Clustering,Machine Learning — Patrick Durusau @ 10:57 am

Cloudera ML: New Open Source Libraries and Tools for Data Scientists by Josh Wills.

From the post:

Today, I’m pleased to introduce Cloudera ML, an Apache licensed collection of Java libraries and command line tools to aid data scientists in performing common data preparation and model evaluation tasks. Cloudera ML is intended to be an educational resource and reference implementation for new data scientists that want to understand the most effective techniques for building robust and scalable machine learning models on top of Hadoop.

…[details about clustering omitted]

If you were paying at least somewhat close attention, you may have noticed that the algorithms I’m describing above are essentially clever sampling techniques. With all of the hype surrounding big data, sampling has gotten a bit of a bad rap, which is unfortunate, since most of the work of a data scientist involves finding just the right way to turn a large data set into a small one. Of course, it usually takes a few hundred tries to find that right way, and Hadoop is a powerful tool for exploring the space of possible features and how they should be weighted in order to achieve our objectives.

Wherever possible, we want to minimize the amount of parameter tuning required for any model we create. At the very least, we should try to provide feedback on the quality of the model that is created by different parameter settings. For k-means, we want to help data scientists choose a good value of K, the number of clusters to create. In Cloudera ML, we integrate the process of selecting a value of K into the data sampling and cluster fitting process by allowing data scientists to evaluate multiple values of K during a single run of the tool and reporting statistics about the stability of the clusters, such as the prediction strength.

Finally, we want to investigate the anomalous events in our clustering- those points that don’t fit well into any of the larger clusters. Cloudera ML includes a tool for using the clusters that were identified by the scalable k-means algorithm to compute an assignment of every point in our large data set to a particular cluster center, including the distance from that point to its assigned center. This information is created via a MapReduce job that outputs a CSV file that can be analyzed interactively using Cloudera Impala or your preferred analytical application for processing data stored in Hadoop.

Cloudera ML is under active development, and we are planning to add support for pivot tables, Hive integration via HCatalog, and tools for building ensemble classifers over the next few weeks. We’re eager to get feedback on bug fixes and things that you would like to see in the tool, either by opening an issue or a pull request on our github repository. We’re also having a conversation about training a new generation of data scientists next Tuesday, March 26th, at 2pm ET/11am PT, and I hope that you will be able to join us.

Another great project by Cloudera!

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