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Fix sign of xi#53

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k-ujihara wants to merge 3 commits intocoleygroup:mainfrom
k-ujihara:patch/reversexisign
Open

Fix sign of xi#53
k-ujihara wants to merge 3 commits intocoleygroup:mainfrom
k-ujihara:patch/reversexisign

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@k-ujihara
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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

  • linted with flake8?
  • (if appropriate) unit tests added?
  • ready to go?

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