Bugfix metric mutual information

[Z712023]

Description

1. correct the test of MI similarity
2. add datetime test

Motivation and Context

1. test is wrong
2. test coverage is not full.

How has this been tested?

Types of changes

• Maintenance (no change in code, maintain the project's CI, docs, etc.)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dd70515) 78.58% compared to head (9d1b93c) 78.94%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   78.58%   78.94%   +0.36%     
==========================================
  Files          64       64              
  Lines        2764     2764              
==========================================
+ Hits         2172     2182      +10     
+ Misses        592      582      -10     

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