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A Stochastic LBFGS Algorithm for Radio Interferometric Calibration

Abstract: 

We present a stochastic, limited-memory Broyden Fletcher Goldfarb Shanno (LBFGS) algorithm that is suitable for handling very large amounts of data. A direct application of this algorithm is radio interferometric calibration of raw data at fine time and frequency resolution. Almost all existing radio interferometric calibration algorithms assume that it is possible to fit the dataset being calibrated into memory. Therefore, the raw data is averaged in time and frequency to reduce its size by many orders of magnitude before calibration is performed. However, this averaging is detrimental for the detection of some signals of interest that have narrow bandwidth and time duration such as fast radio bursts (FRBs). Using the proposed algorithm, it is possible to calibrate data at such a fine resolution that they cannot be entirely loaded into memory, thus preserving such signals. As an additional demonstration, we use the proposed algorithm for training deep neural networks and compare the performance against the mainstream first order optimization algorithms that are used in deep learning.

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Paper Details

Authors:
Sarod Yatawatta, Lukas De Clercq, Hanno Spreeuw, Faruk Diblen
Submitted On:
4 June 2019 - 5:43pm
Short Link:
Type:
Presentation Slides
Event:
Presenter's Name:
Sarod Yatawatta
Document Year:
2019
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Document Files

lofar78.pdf

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[1] Sarod Yatawatta, Lukas De Clercq, Hanno Spreeuw, Faruk Diblen, "A Stochastic LBFGS Algorithm for Radio Interferometric Calibration", IEEE SigPort, 2019. [Online]. Available: http://sigport.org/4564. Accessed: Jun. 18, 2019.
@article{4564-19,
url = {http://sigport.org/4564},
author = {Sarod Yatawatta; Lukas De Clercq; Hanno Spreeuw; Faruk Diblen },
publisher = {IEEE SigPort},
title = {A Stochastic LBFGS Algorithm for Radio Interferometric Calibration},
year = {2019} }
TY - EJOUR
T1 - A Stochastic LBFGS Algorithm for Radio Interferometric Calibration
AU - Sarod Yatawatta; Lukas De Clercq; Hanno Spreeuw; Faruk Diblen
PY - 2019
PB - IEEE SigPort
UR - http://sigport.org/4564
ER -
Sarod Yatawatta, Lukas De Clercq, Hanno Spreeuw, Faruk Diblen. (2019). A Stochastic LBFGS Algorithm for Radio Interferometric Calibration. IEEE SigPort. http://sigport.org/4564
Sarod Yatawatta, Lukas De Clercq, Hanno Spreeuw, Faruk Diblen, 2019. A Stochastic LBFGS Algorithm for Radio Interferometric Calibration. Available at: http://sigport.org/4564.
Sarod Yatawatta, Lukas De Clercq, Hanno Spreeuw, Faruk Diblen. (2019). "A Stochastic LBFGS Algorithm for Radio Interferometric Calibration." Web.
1. Sarod Yatawatta, Lukas De Clercq, Hanno Spreeuw, Faruk Diblen. A Stochastic LBFGS Algorithm for Radio Interferometric Calibration [Internet]. IEEE SigPort; 2019. Available from : http://sigport.org/4564