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\def\makelabel##1{\upshape ##1}}% } {\end{list}\end{raggedright}} \newenvironment{specHead}[2]% {\vspace{20pt}\hrule\vspace{10pt}% \phantomsection\label{#1}\markright{#2}% \pdfbookmark[2]{#2}{#1}% \hspace{-0.75in}{\bfseries\fontsize{16pt}{18pt}\selectfont#2}% }{} \def\TheFullDate{2021-03-15 (revised: 15 March 2021)} \def\TheID{\makeatother } \def\TheDate{2021-03-15} \title{Forecasting COVID-19 with Importance Sampling and Path-Integrals} \author{}\makeatletter \makeatletter \newcommand*{\cleartoleftpage}{% \clearpage \if@twoside \ifodd\c@page \hbox{}\newpage \if@twocolumn \hbox{}\newpage \fi \fi \fi } \makeatother \makeatletter \thispagestyle{empty} \markright{\@title}\markboth{\@title}{\@author} \renewcommand\small{\@setfontsize\small{9pt}{11pt}\abovedisplayskip 8.5\p@ plus3\p@ minus4\p@ \belowdisplayskip \abovedisplayskip \abovedisplayshortskip \z@ plus2\p@ \belowdisplayshortskip 4\p@ plus2\p@ minus2\p@ \def\@listi{\leftmargin\leftmargini \topsep 2\p@ plus1\p@ minus1\p@ \parsep 2\p@ plus\p@ minus\p@ \itemsep 1pt} } \makeatother \fvset{frame=single,numberblanklines=false,xleftmargin=5mm,xrightmargin=5mm} \fancyhf{} \setlength{\headheight}{14pt} \fancyhead[LE]{\bfseries\leftmark} \fancyhead[RO]{\bfseries\rightmark} \fancyfoot[RO]{} \fancyfoot[CO]{\thepage} \fancyfoot[LO]{\TheID} \fancyfoot[LE]{} \fancyfoot[CE]{\thepage} \fancyfoot[RE]{\TheID} \hypersetup{citebordercolor=0.75 0.75 0.75,linkbordercolor=0.75 0.75 0.75,urlbordercolor=0.75 0.75 0.75,bookmarksnumbered=true} \fancypagestyle{plain}{\fancyhead{}\renewcommand{\headrulewidth}{0pt}} \date{} \usepackage{authblk} \providecommand{\keywords}[1] { \footnotesize \textbf{\textit{Index terms---}} #1 } \usepackage{graphicx,xcolor} \definecolor{GJBlue}{HTML}{273B81} \definecolor{GJLightBlue}{HTML}{0A9DD9} \definecolor{GJMediumGrey}{HTML}{6D6E70} \definecolor{GJLightGrey}{HTML}{929497} \renewenvironment{abstract}{% \setlength{\parindent}{0pt}\raggedright \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt \textcolor{GJBlue}{\large\bfseries\abstractname\space} }{% \vskip8pt \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt } \usepackage[absolute,overlay]{textpos} \makeatother \usepackage{lineno} \linenumbers \begin{document} \author[1]{Lester Ingber} \affil[1]{ Physical Studies Institute LLC} \renewcommand\Authands{ and } \date{\small \em Received: 7 February 2021 Accepted: 2 March 2021 Published: 15 March 2021} \maketitle \begin{abstract} Background: Forecasting nonlinear stochastic systems most often is quite difficult, without giving in to temptations to simply simplify models for the sake of permitting simple computations.Objective: Here, two basic algorithms, Adaptive Simulated Annealing (ASA) and path-integral codes PATHINT/PATHTREE (and their quantum generalizations qPATHINT/ qPATHTREE) are suggested as being useful to fit COVID-19 data and to help predict spread or control of this pandemic. Multiple variables are considered, e.g., potentially including ethnicity, population density, obesity, deprivation, pollution, race, environmental temperature.Method: ASA and PATHINT/PATHTREE have been demonstrated as being effective to forecast properties in three disparate disciplines in neuroscience, financial markets, and combat analysis.Results: Not only can selected systems in these three disciplines be aptly modeled, but results of detailed calculations have led to new results and insights not previously obtained. \end{abstract} \keywords{path integral, importance sampling, financial options, combat analysis.} \begin{textblock*}{18cm}(1cm,1cm) % {block width} (coords) \textcolor{GJBlue}{\LARGE Global Journals \LaTeX\ JournalKaleidoscope\texttrademark} \end{textblock*} \begin{textblock*}{18cm}(1.4cm,1.5cm) % {block width} (coords) \textcolor{GJBlue}{\footnotesize \\ Artificial Intelligence formulated this projection for compatibility purposes from the original article published at Global Journals. However, this technology is currently in beta. \emph{Therefore, kindly ignore odd layouts, missed formulae, text, tables, or figures.}} \end{textblock*} \let\tabcellsep& \section[{Introduction}]{Introduction}\par t is generally recognized that the spread of COVID-19 is affected by multiple variables, e.g., potentially including ethnicity, population density, obesity, deprivation, pollution, race, environmental temperature \hyperref[b0]{(Anastassopoulou et al, 2020;}\hyperref[b2]{Bray et al, 2020;}\hyperref[b16]{Li et al, 2020)}. Also, the Centre for Evidence-Based Medicine (CEBM) regularly cites papers on the dynamics of COVID-19 at https://www.cebm.net/evidence-synthesis/ transmission-dynamics-of-covid-19/.\par This proposal offers the application of two basic multivariate algorithms to fairly generic issues in forecasting. As such, they may be useful to fit COVID-19 data and to help predict upcoming spread and control of this pandemic. (a) Adaptive Simulated Annealing (ASA) developed by the author \hyperref[b3]{(Ingber, 1993a}) is an importancesampling optimization code usually used for nonlinear, nonequilibrium, non-stationary, multivariate systems.\par (b) PATHINT is a numerical path-integral PATHINT code developed by the author \hyperref[b4]{(Ingber, 1993b}) used for propagation of nonlinear probability distributions, including discontinuities. These codes were developed by the author and applied across multiple disciplines.\par There is not "one size fits all" in forecasting different systems. This was demonstrated for three systems \hyperref[b12]{(Ingber, 2020b)}, where the author has addressed multiple projects across multiple disciplines using these tools: 72 papers/reports/lectures in neuroscience, e.g. \hyperref[b10]{(Ingber, 2018;}\hyperref[b13]{Ingber, 2021)}, 31 papers/reports/lectures in finance, e.g. \hyperref[b15]{(Ingber \& Mondescu, 2003;}\hyperref[b11]{Ingber, 2020a)}, 24 papers/reports/ lectures in combat analyses, e.g. \hyperref[b4]{(Ingber, 1993b;}\hyperref[b10]{Ingber, 2015)}, and 11 papers/reports/lectures in optimization, e.g. \hyperref[b1]{(Atiya et al, 2003;}\hyperref[b9]{Ingber, 2012)}, It is reasonable to expect that this approach can be applied to many other projects.\par For example, the path-integral representation of multivariate nonlinear stochastic differential equations permits derivation of canonical momenta indicators (CMI) which are faithful to intuitive concepts like Force, Momenta, Mass, etc \hyperref[b6]{(Ingber, 1996;}\hyperref[b10]{Ingber, 2015;}\hyperref[b14]{Ingber \& Mondescu, 2001)}. Correlations among variables are explicitly included in the CMI. \section[{II.}]{II.} \section[{Data a) 50+ Locations}]{Data a) 50+ Locations}\par The data being used contains 3340 cities throughout the US and some territories. The locations have been broken into 57 States and Territories ready for production runs. \section[{III.}]{III.} \section[{Technical Considerations}]{Technical Considerations}\par If there is not time to process large data sets, then the data can be randomly sampled, e.g., as described in another paper, "Developing bid -ask proba bilities for high-frequency trading" \hyperref[b11]{(Ingber, 2020a)}.\par A large and updated database for COVID-19 is maintained by the John Hopkins University (JHU) at https://github.com/CSSEGISandData/COVID-19/blob/m aster/archived\textunderscore data/archived\textunderscore daily\textunderscore case\textunderscore up-dates/01-21-2020\textunderscore 2200.csv. This database was used for a pilot study.\par If the required forecast is longer than the conditional distribution can sustain, PATHINT/ PATHTREE can be used to propagate the distribution.\par The dataset should be broken into independent Training and Testing subsets, to test the trained distribution. If this is not possible, e.g., because of data or time limitations, at the least experts can be used to judge if the model is ready for realtime applications, e.g., the Delphi method \hyperref[b17]{(Okoli \& Pawlowski, 2004)}.\par If an algorithm like ASA is to be used across a large class of problems, then it must be tunable to different classes. Over the 30+ years of ASA development, the author has worked with many volunteers who have contributed valuable ideas, modifications and corrections to this code. This has resulted in over 150 ASA options that can be used for additional timing additional tuning making it useful across many classes of problems.\par The path integral algorithm includes its mathematical equivalents, a large class of stochastic differential equations and a large class of partial differential equations. The advantages of the path integral algorithm are:\par (a) Intuitive description in terms of classical forces, inertia, momentum, etc., leading to new indicators. (b) Delivering a cost function derived from a Lagrangian, or its Action (Lagrangian x dt). Sometimes constraints need to be added as Lagrange multipliers, as was required for normalization requirements in financial risk projects \hyperref[b8]{(Ingber, 2010)}.\par IV. \section[{Pilot Study}]{Pilot Study}\par The shape of the spread of this virus is clearly nonlinear. A simple model was used for a pilot study to at least capture some nonlinearity. For example, just using the daily number of total cases reported, C, the short-time conditional Probability P(t + 1|t) is given in terms of its effective Lagrangian L, P = exp (L eff dt) (including the logarithm of the prefactor normalization as it may contain nonlinearities as modeled here):\par (1) with parameters to be fit to data \{a, b, c, d\}. This is a simple one-factor model. In more than one dimension, g xx is the metric of this space, the inverse of the covariance matrix.\par For the full data set, 100,000 generated-state iteration-s of this cost/objective function's states over the JHU data gave Comet is being phased out and users will soon be using the new Expanse platform. \section[{b) Parallel Processing}]{b) Parallel Processing}\par "Parallel Processing for this project basically is similar to many projects developed by the author as Principal Investigator at the Extreme Science and Engineering Discovery Environment (XSEDE.org) since February 2013. That is "trivial MPI" is used, wherein many simultaneous runs are achieved by simply reading in different data files to ASA, using the "array" feature offered by some XSEDE platforms. As offered in a previous XSEDE Extended Collaborative Support Service (ECSS) ticket: Parallelization efficiency is 1 for jobs running on a single core that is max one could get. For multi-threaded apps one can get some to decent bump in speed using multiple cores up to some point before plateauing. However, speed bump with multiple cores often leads drop in parallelization efficiency.\par Drawback of using single core is too long run time. Though in this case, you are running array jobs with single core and getting maximum efficiency. This is the ideal situation on 'Comet' because nodes on this machine can be shared. You should explain on Scaling and parallelization efficiency L eff = [(x t+1 ? x t ? g x dt)g xx? (x? t+1 ? x? t ? g x? dt) + 1/2 log(2? dtg 2 ) g x = a exp(x b ) g xx? = c exp(x d ) g = det(g xx? ) a\par section that your application is not multi-threaded and you use single core on comet to run your jobs. This gives efficiency of 1, which is maximum value achievable. However, you run array of jobs in one submission and each job uses a single core. This is most efficient use of resources because node sharing is allowed on Comet. It won't hurt to write that you have consulted XSEDE staff on this matter." \section[{c) Xeon Processor}]{c) Xeon Processor}\par The full US run was done on the author's P1 Gen 3 Thinkpad with a Xeon processor. Previous runs show full agreement between the Comet and the Thinkpad runs when "-ffloat-store" is added to the compile parameters. A full US run of 100,000 generated states with 3239 non-zero locations took 1 hr 47 min 17 sec. (All runs including subsets of the full US therefore took about twice that long.)V. \section[{All Results}]{All Results}\par All locations were processed to exclude those with all "0" for all days, 99 of them.\par Note that a few locations, those with just sublocation as it turned out, gave parameter values that hit boundaries of assigned parameter maximums or minimums. Since these were few exceptions, the decision was made to keep the default ranges given in Table {\ref 1}. \section[{Table 1}]{Table 1}\par Par Min Max0 -2 2 1 -2 2 2 0.1 2 3 -2\textbf{2}\par Final Results for all 58 Locations are given in Table \hyperref[tab_0]{2}. \section[{Conclusion}]{Conclusion}\par Two algorithms are suggested for fitting data and forecasting COVID-19, ASA for importancesampling and fitting parameters to models, and PATHINT/PATHTREE. These algorithms have been applied to several disciplines -neuroscience, financial markets, combat analysis. While optimization and pathintegral algorithms are now quite well-known (at least to many scientists), these previous applications give strong support to application of these tools to COVID-19 data.\begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-2.png} \caption{\label{fig_0}=}\end{figure} \begin{figure}[htbp] \noindent\textbf{2} \par \begin{longtable}{P{0.7001445086705201\textwidth}P{0.14985549132947976\textwidth}} \multicolumn{2}{l}{RUNS\textunderscore COVID/asa\textunderscore usr\textunderscore out\textunderscore 01-Alabama}\\ \multicolumn{2}{l}{final cost value = 0.0006165903}\\ \multicolumn{2}{l}{Parameter Value}\\ 0\tabcellsep 0.07526909\\ 1\tabcellsep 0.7867917\\ 2\tabcellsep 0.1\\ 3\tabcellsep 1.036661\\ \multicolumn{2}{l}{RUNS\textunderscore COVID/asa\textunderscore usr\textunderscore out\textunderscore 02-Alaska}\\ \multicolumn{2}{l}{final cost value = 0.0008660421}\\ \multicolumn{2}{l}{Parameter Value}\\ 0\tabcellsep 0.03041555\\ 1\tabcellsep 0.9221085\\ 2\tabcellsep 0.1\\ 3\tabcellsep 0.9276368\end{longtable} \par \caption{\label{tab_0}Table 2}\end{figure} \footnote{© 2021 Global JournalsForecasting COVID-19 with Importance Sampling and Path-Integrals} \backmatter \subsection[{Acknowledgments}]{Acknowledgments}\par The author thanks the Extreme Science and Engineering Discovery Environment (XSEDE.org), for supercomputer grants since February 2013. The PI has held yearly grants for supercomputer resources from XSEDE, mostly for work on SMNI but for a couple years also to develop qPATHINT and qPATHTREE codes for propagation of quantum wave functions in the presence of random shocks. \begin{bibitemlist}{1} \bibitem[]{b5}\label{b5} \textit{}, \url{https://www.ingber.com/combat93\textunderscore c3sci.pdf} American Institute of Aeronautics and Astronautics. p. . \bibitem[ (1996)]{b7}\label{b7} \textit{}, \url{https://www.ingber.com/markets96\textunderscore momenta.pdf} September 1996. \bibitem[Atiya et al. (2003)]{b1}\label{b1} ‘A reinforcement learning method based on adaptive simulated annealing’. A F Atiya , A G Parlos , \& L Ingber . \url{https://www.ingber.com/asa03\textunderscore reinforce.pdf} \textit{Proceedings International Midwest Symposium on Circuits and Systems (MWCAS)}, (International Midwest Symposium on Circuits and Systems (MWCAS)) 2003. December 2003. p. . \bibitem[Ingber et al. ()]{b9}\label{b9} ‘Adaptive Simulated Annealing’. L Ingber , H A OliveiraJr , A Petraglia , L Ingber , M A S R Machado \& M , Petraglia . \url{https://www.Ingber.com/asa11\textunderscore options.pdf} \textit{Stochastic global optimization and its applications with fuzzy adaptive simulated annealing}, 2012. Springer. p. . (Invited Paper. URL) \bibitem[Ingber & R and Mondescu ()]{b15}\label{b15} ‘Automated internet trading based on optimized physics models of markets’. L P Ingber \& R , Mondescu . \url{https://www.ingber.com/markets03\textunderscore automated.pdf} \textit{Intelligent Internet-Based Information Processing Systems}, R J Howlett, N S Ichalkaranje, L C Jain, \& G Tonfoni (ed.) 2003. World Scientific. p. . (Invited paper. URL) \bibitem[Ingber ()]{b6}\label{b6} ‘Canonical momenta indicators of financial markets and neocortical EEG’. 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