Fix pandas 1.5.3 compatibility issues

[staskh]

Problem

Users with pandas 1.5.3 are experiencing errors when using IGLU-Python functions:

TypeError: auc_single() got an unexpected keyword argument 'include_groups'

Root Cause

The include_groups parameter was introduced in pandas 2.0.0, but many users still have pandas 1.5.3 installed. This parameter doesn't exist in older pandas versions, causing the error.

Solution

This PR fixes compatibility by:

1. Removing all include_groups=False parameters from groupby().apply() calls
2. Adding explicit column selection to prevent deprecation warnings
3. Maintaining identical functionality across pandas versions

Changes Made

Files Modified

• iglu_python/auc.py - Fixed 2 groupby operations
• iglu_python/grade.py - Fixed 1 groupby operation
• iglu_python/episode_calculation.py - Fixed 3 groupby operations
• pyproject.toml - Version bump to 0.3.1

Technical Details

• Before: data.groupby('id').apply(lambda x: ..., include_groups=False)
• After: data.groupby('id')[['gl']].apply(lambda x: ...)

Compatibility Matrix

Pandas Version	Status	Behavior
1.5.3	✅ Works	Excludes grouping columns (default)
2.0+	✅ Works	Excludes grouping columns (explicit)

Testing

✅ All functions tested and working:

• iglu.auc() - AUC calculation
• iglu.grade() - GRADE score calculation
• iglu.episode_calculation() - Episode analysis

Impact

• No breaking changes - API remains identical
• No performance impact - Explicit column selection improves efficiency
• Wider compatibility - Works with pandas 1.5.3 through 2.2.3+
• Future-proof - Prevents deprecation warnings

This fix ensures IGLU-Python works seamlessly across different pandas versions without requiring users to upgrade their pandas installation.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.16%. Comparing base (8932308) to head (ec925d1).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
iglu_python/auc.py	50.00%	1 Missing ⚠️
iglu_python/episode_calculation.py	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
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  Coverage   91.16%   91.16%           
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  Files          46       46           
  Lines        1754     1754           
=======================================
  Hits         1599     1599           
  Misses        155      155           

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