Add a num_threads helper argument to pathfinder() #741
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Submission Checklist
Summary
Closes #738 by adding a keyword argument
num_threads
. This checks that the model was compiled withSTAN_THREADS
defined and if so, sets the environment variableSTAN_NUM_THREADS
to the desired value.This also fixes a small oversight pointed out on the forums: https://discourse.mc-stan.org/t/pathfinder-does-not-accept-multiple-inits/34580/
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