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2015 ; 5
(ä): 10492
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Data Clustering using Memristor Networks
#MMPMID26020412
Choi S
; Sheridan P
; Lu WD
Sci Rep
2015[May]; 5
(ä): 10492
PMID26020412
show ga
Memristors have emerged as a promising candidate for critical applications such
as non-volatile memory as well as non-Von Neumann computing architectures based
on neuromorphic and machine learning systems. In this study, we demonstrate that
memristors can be used to perform principal component analysis (PCA), an
important technique for machine learning and data feature learning. The
conductance changes of memristors in response to voltage pulses are studied and
modeled with an internal state variable to trace the analog behavior of the
device. Unsupervised, online learning is achieved in a memristor crossbar using
Sanger's learning rule, a derivative of Hebb's rule, to obtain the principal
components. The details of weights evolution during training is investigated over
learning epochs as a function of training parameters. The effects of device
non-uniformity on the PCA network performance are further analyzed. We show that
the memristor-based PCA network is capable of linearly separating distinct
classes from sensory data with high clarification success of 97.6% even in the
presence of large device variations.