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From Apache Wiki <>
Subject [Incubator Wiki] Update of "HornProposal" by edwardyoon
Date Thu, 06 Aug 2015 02:05:02 GMT
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The "HornProposal" page has been changed by edwardyoon:

Initial draft

New page:
== Abstract ==

(tentatively named "Horn [hɔ:n]", korean meaning of Horn is a "Spirit") is a neuron-centric
programming APIs and execution framework for large-scale deep learning, built on top of Apache

== Proposal ==

It is a goal of the Horn to provide a neuron-centric programming APIs which allows user to
easily define the characteristic of artificial neural network model and its structure, and
its execution framework that leverages the heterogeneous resources on Hama and Hadoop YARN

== Background ==

The initial ANN code was developed at Apache Hama project by a committer, Yexi Jiang (Facebook)
in 2013. The motivation behind this work is to build a framework that provides more intuitive
programming APIs like Google's MapReduce or Pregel and supports applications needing large
model with huge memory consumptions in distributed way.

== Rationale ==

While many of deep learning open source softwares such as Caffe, DeepDist, and NeuralGiraph
are still data or model parallel only, we aim to support both data and model parallelism and
also fault-tolerant system design. The basic idea of data and model parallelism is use of
the remote parameter server to parallelize model creation and distribute training across machines,
and the BSP framework of Apache Hama for performing asynchronous mini-batches. Within single
BSP job, each task group works asynchronously using region barrier synchronization instead
of global barrier synchronization, and trains large-scale neural network model using assigned
data sets in BSP paradigm. Thus, we achieve data and model parallelism. This architecture
is inspired by Google's !DistBelief (Jeff Dean et al, 2012).

== Initial Goals ==

Some current goals include: 
 * builds new community
 * provides more intuitive programming APIs
 * needs both data and model parallelism support
 * must run natively on both Hama and Hadoop2
 * needs also GPUs and InfiniBand support (FPGAs if possible)

== Current Status ==

=== Meritocracy ===

The core developers understand what it means to have a process based on meritocracy. We will
provide continuous efforts to build an environment that supports this, encouraging community
members to contribute.

=== Community ===

A small community has formed within the Apache Hama project and some companies such as instant
messenger service company and mobile manufacturing company. And many people are interested
in the large-scale deep learning platform itself. By bringing Horn into Apache, we believe
that the community will grow even bigger. 

=== Core Developers ===

Edward J. Yoon, Thomas Jungblut, and Dongjin Lee

== Known Risks ==

=== Orphaned Products ===

Apache Hama is already a core open source component at Samsung Electronics, and Horn also
will be used by Samsung Electronics, and so there is no direct risk for this project to be

=== Inexperience with Open Source ===

Some are very new and the others have experience using and/or working on Apache open source

=== Homogeneous Developers ===

The initial committers are from different organizations such as, Microsoft, Samsung Electronics,
and Line Plus.

=== Reliance on Salaried Developers ===

Few will be worked as a full-time open source developer. Other developers will also start
working on the project in their spare time.

=== Relationships with Other Apache Products ===

 * Horn is based on Apache Hama
 * Apache Zookeeper is used for distributed locking service
 * Natively run on Apache Hadoop and Mesos
 * Horn can be somewhat overlapped with Singa podling (If possible, we'd also like to use
Singa or Caffe to do the heavy lifting part).

=== An Excessive Fascination with the Apache Brand ===

Horn itself will hopefully have benefits from Apache, in terms of attracting a community and
establishing a solid group of developers, but also the relation with Apache Hama, a general-purpose
BSP computing engine. These are the main reasons for us to send this proposal. 

== Documentation ==

Initial plan about Horn can be found at

== Initial Source ==

The initial source code has been release as part of Apache Hama project developed under Apache
Software Foundation. The source code is currently hosted at

== Cryptography ==

Not applicable.

== Required Resources ==

=== Mailing Lists ===
 * horn-private
 * horn-dev 

=== Subversion Directory ===
 * Git is the preferred source control system: git://

=== Issue Tracking ===
 * a JIRA issue tracker, HORN

== Initial Committers and Affiliations ==
 * Thomas Jungblut (tjungblut at apache dot org)
 * Edward J. Yoon (edwardyoon at apache dot org)
 * Dongjin Lee ( at gmail dot com)
 * Minho Kim ( at samsung dot com)
 * Chia-Hung Lin (chl501 at apache dot org)
 * Behroz Sikander (behroz89 at gmail dot com)

== Affiliations ==
 * Thomas Jungblut (Microsoft)
 * Edward J. Yoon (Samsung Electronics)
 * Donjin Lee (LINE Plus)
 * Minho Kim (Samsung Electronics)
 * Chia-Hung Lin (Self)
 * Behroz Sikander (Siemens)
 * TODO 

== Sponsors ==

=== Champion ===
 * Edward J. Yoon <edwardyoon at apache dot org>

=== Nominated Mentors ===

=== Sponsoring Entity ===
The Apache Incubator

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