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Deep learning is becoming an important AI paradigm for pattern recognition, image/video processing and fraud detection applications in finance. The computational complexity of a deep learning network dictates need for a distributed realization. The big data lab at Impetus, led by Dr. Vijay Srinivas Agneeswaran, has built the first prototype of the distributed deep learning network over Apache Spark. They have parallelized the training phase of the network and consequently reduced training time.
Geoffrey Hinton presented the paradigm for fast learning in a deep belief network . This paper, with the advent of GPUs and widespread availability of computing power, was seminal. Consequently a number of applications are being realized over it, in various fields such as credit card fraud detection, multi-modal information processing etc. This is in addition to speech recognition and image processing, which have been already transformed by the application of deep learning . A few other efforts to realize distributed deep learning networks include the Google’s work by Jeffrey Dean , the Sparkling water from HexData, the DeepLearning4J etc.
Spark is the next generation Hadoop framework from the UC Berkeley and Databricks teams – even the Hadoop vendors have started bundling and distributing Spark with Hadoop versions. The Impetus researchers have implemented a stacked Restricted Boltzman Machines as a deep belief network, similar to . The architecture of their deep learning network over Spark is given in the diagram above. Every node in the cluster runs a copy of the whole deep learning network – they start from the same exact network. However, as each node looks at only parts of the training data, they diverge, reflecting the lessons learnt from the respective training data. The nodes use a publish-subscribe system that the researchers have built over Spark to exchange the results. Each node is however asynchronously running the network through the local training data and occasionally synchronizing with other nodes. Eventually, the process will ensure the equivalent of all nodes learning all the training data.
This is the first attempt at realizing a distributed deep learning network directly over Spark. The researchers are working on a few applications including image search and semantic compositionality (to provide natural language interface to relational queries) to show case the power of the deep learning platform.
For more details, please visit http://www.datasciencecentral.com/profiles/blogs/implementing-a-distributed-deep-learning-network-over-spark.
 Hinton, Geoffrey, Simon Osindero, and Yee-Whye Teh. "A fast learning algorithm for deep belief nets." Neural computation 18.7 (2006): 1527-1554.
 Li Deng and Dong Yu, "Deep Learning: Methods and Applications." Foundations and Trends® in Signal Processing: Vol. 7: No. 3–4, pp 197-387, 2014.
 Dean, Jeffrey, et al. “Large scale distributed deep networks.” Advances in Neural Information Processing Systems. 2012.
 Le Roux, Nicolas, and Yoshua Bengio. "Representational power of restricted Boltzmann machines and deep belief networks." Neural Computation 20.6 (2008): 1631-1649.
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