Monitor output of a function parallelized through ParallelMap

Question

mle[data_] := ArgMin[
              {-LogLikelihood[twoState[a, b, 60, 0.2], data],  
               Element[{a, b}, Reals] && a > 0 && b > 0}, 
              {a, b}]

ParallelMap[mle, {BG6, BG3, DC5}]

I'm executing the mle function in parallel over independent datasets using ParallelMap. I'd like to see the output as each parallel evaluation finishes. I looked at the documentation for Monitor, but its not clear to me how to use it here. It looks I need to a vector to hold the results using something like:

SharedVariable[params]

And then append the output of mle to params inside a call to Monitor, but I don't know the syntax to do this.

This is similar to http://stackoverflow.com/q/7352461/615464 — Sjoerd C. de Vries, Nov 01 '11 at 18:25

score 0 · Answer 1 · answered Mar 30 '12 at 01:28

If you just want to view the result when it is ready, you can print it before returning.

mle[data_] := Module[{result},
    result = ArgMin[
          {-LogLikelihood[twoState[a, b, 60, 0.2], data],  
           Element[{a, b}, Reals] && a > 0 && b > 0}, 
          {a, b}];
    Print[result];
    Return[result];
];

You can replace the call to Print if you want to do something more complicated, like calling Monitor.

Monitor output of a function parallelized through ParallelMap

1 Answers1