plot from inside of function in parallel worker
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Torsten Reh
el 25 de Dic. de 2021
Respondida: Walter Roberson
el 26 de Dic. de 2021
hi, i am running some function (fun1) parallel using spmd and i want to plot values that are calculated inside of fun1. I want to display the values in a single plot, using a custom plot function (PlotFun). The problem is that i can not use "send" directly inside the spmd environment. This has to happen from within fun1.
The problem is that fun1 does not recognise the DataQueue that i have set up earlier. And if i refer to it using "gcp", it still has problems but then regarding the send function.
This would not be a problem if i could use the "send" function directly inside spmd. The reason for this quite weird circumstance is that i want to plot some values inside an objective function that is being evaluated by a solver running in parallel mode. This is resembled by the following simplified example:
clear, clc;
% initialize plot function and create figure
PlotFun([], "INIT")
D = parallel.pool.DataQueue;
D.afterEach(@(x) PlotFun(x, "ADD")); % add value after each evaluation
spmd
% option a:
fun1;
% % option b:
%send(D, fun1);
end
function out = fun1
% option a:
send(gcp, 1);
% % option b:
%out = 1;
end
function PlotFun(x, UseMode)
persistent f;
persistent i;
if UseMode == "INIT"
f = figure;
i = 1;
return
end
if UseMode == "ADD"
set(0, 'CurrentFigure', f);
hold on
plot(i, x, 'bo')
hold off
i = i+1;
return
end
end
i out-commented option b. It does work, but i can not have the "send" there since that is hidden from me inside the solver file.
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Respuesta aceptada
Walter Roberson
el 26 de Dic. de 2021
Enhanced to support plotting multiple points at the same time.
In the current version, the x axis location becomes the same as the order that the values happen to be returned; you could certainly change that, such as having fun1 return two columns with x and y values
% initialize plot function and create figure
PlotFun([], "INIT")
D = parallel.pool.DataQueue;
D.afterEach(@(x) PlotFun(x, "ADD")); % add value after each evaluation
spmd
% % option b:
send(D, fun1());
end
function out = fun1
out = labindex * 10 + randi(9);
end
function PlotFun(y, UseMode)
persistent AL AX i
if UseMode == "INIT"
f = figure;
AX = axes('Parent', f);
AL = animatedline('Parent', AX, 'color', 'b', 'Marker', 'o');
i = 0;
return
end
if UseMode == "ADD"
xvals = i + 1: i + length(y);
addpoints(AL, xvals, y);
i = xvals(end);
end
end
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