Sponsor
Portland State University. Systems Science Graduate Program
First Advisor
Dan Hammerstrom
Date of Publication
1-1-2011
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Systems Science
Department
Systems Science
Language
English
Subjects
Multi-threading, Hierarchical temporal memory cortical learning algorithm, HTM CLA, Machine learning, Artificial intelligence, Pattern recognition systems, Neural networks (Computer science)
DOI
10.15760/etd.202
Physical Description
1 online resource (xiii, 115 p.) : ill. (some col.)
Abstract
Strongly inspired by an understanding of mammalian cortical structure and function, the Hierarchical Temporal Memory Cortical Learning Algorithm (HTM CLA) is a promising new approach to problems of recognition and inference in space and time. Only a subset of the theoretical framework of this algorithm has been studied, but it is already clear that there is a need for more information about the performance of HTM CLA with real data and the associated computational costs. For the work presented here, a complete implementation of Numenta's current algorithm was done in C++. In validating the implementation, first and higher order sequence learning was briefly examined, as was algorithm behavior with noisy data doing simple pattern recognition. A pattern recognition task was created using sequences of handwritten digits and performance analysis of the sequential implementation was performed. The analysis indicates that the resulting rapid increase in computing load may impact algorithm scalability, which may, in turn, be an obstacle to widespread adoption of the algorithm. Two critical hotspots in the sequential code were identified and a parallelized version was developed using OpenMP multi-threading. Scalability analysis of the parallel implementation was performed on a state of the art multi-core computing platform. Modest speedup was readily achieved with straightforward parallelization. Parallelization on multi-core systems is an attractive choice for moderate sized applications, but significantly larger ones are likely to remain infeasible without more specialized hardware acceleration accompanied by optimizations to the algorithm.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
Persistent Identifier
http://archives.pdx.edu/ds/psu/7090
Recommended Citation
Price, Ryan William, "Hierarchical Temporal Memory Cortical Learning Algorithm for Pattern Recognition on Multi-core Architectures" (2011). Dissertations and Theses. Paper 202.
https://doi.org/10.15760/etd.202
Comments
Portland State University. Systems Science Graduate Program