Setting Borg parameters from the Matlab wrapper

In previous posts we talked about how to compile and run the Borg Matlab wrapper on Windows and OSX/Linux. To run the optimization after everything is compiled, the function call looks like this:

[vars, objs] = borg(11, 2, 0, @DTLZ2, 1000, zeros(1,11), ones(1,11), 0.01*ones(1,2), parameters);

In order, the arguments are:

- number of decision variables
- number of objectives
- number of constraints
- handle to function to be optimized
- number of function evaluations to perform
- decision lower bounds
- decision upper bounds
- epsilon values
- parameters

The last argument parameters is the topic of this post. This is a cell array that allows you to set the parameters without recompiling anything. For example, to set the random seed, you might do this:

parameters = {'rngstate', 12345, 'initialPopulationSize', 200, 'de.stepSize', 0.3}

before running the borg() function with parameters as the last argument. Notice this follows the Matlab cell array options format of {key, value, key, value ...}, so there must be an even number of items in the cell array.

Using the nativeborg.cpp file I tracked down all of the parameters (string keys) that the user can choose:

'rngstate': random seed
'frequency': (for saving approximation sets during runtime)

// these two are enumerated types in the C code, not advised to change them

// operator-specific parameters

That’s all, thanks to Liz Houle at Boulder for the suggestion.


One thought on “Setting Borg parameters from the Matlab wrapper

  1. Pingback: Water Programming Blog Guide (Part I) – Water Programming: A Collaborative Research Blog

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s