[FutureWarning] Remove the usage of the deprecated parameter.

[drivanov]

Description

By removing the deprecated multi_class parameter in LogisticRegression(...) calls, as indicated by following warnings,

/usr/local/lib/python3.10/dist-packages/sklearn/linear_model/_logistic.py:1247: FutureWarning: 'multi_class' 
was deprecated in version 1.5 and will be removed in 1.7. From then on, it will always use 'multinomial'. 
Leave it to its default value to avoid this warning.
  warnings.warn(

we eliminate these warnings.

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Changes

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[jermainewang]

Sklearn 1.5 was released just about half a year ago and I'm afraid the changes may accidentally break users with older versions.

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