H2O (software)

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The corporate logo of H2O
Original author(s)H2O.ai
Initial release2011; 8 years ago (2011)
Stable release / August 1, 2018; 7 months ago (2018-08-01)
Repository Edit this at Wikidata
Written inH2O (written in Java, Python, and R)[1][2][3]
Operating systemLinux, macOS, and Microsoft Windows
PlatformApache Hadoop Distributed File System; Amazon EC2, Google Compute Engine, and Microsoft Azure.
Standard(s)Databricks certified on Spark.[3]
Available inEnglish
Typebig data analytics, machine learning, statistical learning theory[4]
LicenseApache license 2.0[5]
As of1 June 2015

H2O is open-source software for big-data analysis. It is produced by the company H2O.ai. H2O allows users to fit thousands of potential models as part of discovering patterns in data.

The H2O software runs can be called from the statistical package R, Python, and other environments. It is used for exploring and analyzing datasets held in cloud computing systems and in the Apache Hadoop Distributed File System as well as in the conventional operating-systems Linux, macOS, and Microsoft Windows. The H2O software is written in Java, Python, and R. Its graphical-user interface is compatible with four browsers: Chrome, Safari, Firefox, and Internet Explorer.


The H2O project aims to develop an analytical interface for cloud computing, providing users with tools for data analysis.[1] The software is open-source and freely distributed. The company receives fees for providing customer service and customized extensions.

Mining of big data[edit]

Big datasets are too large to be analyzed using traditional software like R. The H2O software provides data structures and methods suitable for big data. H2O allow users to analyze and visualize whole sets of data without using the Procrustean strategy of studying only a small subset with a conventional statistical package.[2] H2O's statistical algorithms includes K-means clustering, generalized linear models, distributed random forests, gradient boosting machines, naive bayes, principal component analysis, and generalized low rank models.[6]

H2O is also able to run on Spark.[7]

Iterative methods for real-time problems[edit]

H2O uses iterative methods that provide quick answers using all of the client's data. When a client cannot wait for an optimal solution, the client can interrupt the computations and use an approximate solution.[1] In its approach to deep learning,[2][6][8] H2O divides all the data into subsets and then analyzing each subset simultaneously using the same method. These processes are combined to estimate parameters by using the Hogwild scheme,[9] a parallel stochastic gradient method.[10] These methods allow H2O to provide answers that use all the client's data, rather than throwing away most of it and analyzing a subset with conventional software.


Programming languages[edit]

The H2O software has an interface to the following programming languages: Java (6 or later), Python (2.7.x, 3.5.x), R (3.0.0 or later) and Scala (1.4-1.6).[2][3]

Operating systems[edit]

The H2O software can be run on conventional operating-systems: Microsoft Windows (7 or later), Mac OS X (10.9 or later), and Linux (Ubuntu 12.04 ; RHEL/CentOS 6 or later),[3] It also runs on big-data systems, particularly Apache Hadoop Distributed File System (HDFS), several popular versions: Cloudera (5.1 or later), MapR (3.0 or later), and Hortonworks (HDP 2.1 or later). It also operates on cloud computing environments, for example using Amazon EC2, Google Compute Engine, and Microsoft Azure. The H2O Sparkling Water software is Databricks-certified on Apache Spark.[3]

Graphical user interface and browsers[edit]

Its graphical user interface is compatible with four browsers (unless specified, in their latest versions as of 1 June 2015): Chrome, Safari, Firefox, Internet Explorer (IE10).[3]


  1. ^ a b c Harris (2012)
  2. ^ a b c d Novet (2014)
  3. ^ a b c d e f "Recommended systems for H2O". 0xdata.com. H2O.ai. May 2015. Archived from the original on 2015-05-30. Retrieved 2015-06-01.
  4. ^ Hardy (2014)
  5. ^ https://github.com/h2oai/h2o-2/blob/master/LICENSE.txt
  6. ^ a b Aiello, Spencer; Tom Kraljevic; Petr Maj (2015), with contributions from the 0xdata team, "h2o: R Interface for H2O", The Comprehensive R Archive Network (CRAN), Contributed Packages, The R Project for Statistical Computing (
  7. ^ "FAQ — H2O documentation". docs.h2o.ai. Retrieved 2017-01-28.
  8. ^ "Prediction of IncRNA using Deep Learning Approach". Tripathi, Rashmi; Kumari, Vandana; Patel, Sunil; Singh, Yashbir; Varadwaj, Pritish. International Conference on Advances in Biotechnology (BioTech). Proceedings: 138-142. Singapore: Global Science and Technology Forum. (2015)
  9. ^ Description of the iterative method for computing maximum-likelihood estimates for a generalized linear model.
  10. ^ Benjamin Recht; Re, Christopher; Wright, Stephen & Feng Niu (2011). J. Shawe-Taylor; R.S. Zemel; P.L. Bartlett; F. Pereira & K.Q. Weinberger, eds. "Hogwild: A Lock-Free Approach to Parallelizing Stochastic Gradient Descent" (PDF). Advances in Neural Information Processing Systems. Curran Associates, Inc. 24: 693–701. Recht's PDF


External links[edit]