Fix sign of xi - #53
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Description
ξ value is typically 0.01, but the sign in the code is opposite to the typical implementation. This PR fixes it.
Example / Current workflow
A typical EI implementation is like:
https://krasserm.github.io/2018/03/21/bayesian-optimization/
Bugfix / Desired workflow
This PR fixes test_pi to be the correct implementation.
Relevant issues
The current unit test for EI does not detect this issue.
Checklist