Version 1.1.0

What's New in v1.1.0

Added

• Reproducibility Support: Evolution can now be made deterministic by setting a random seed

  • Optional seed parameter in [NEAT] config section
  • Optional seed parameter in Population.__init__()
  • Optional seed parameter in ParallelEvaluator.__init__() for reproducible parallel evaluation
  • Comprehensive documentation in docs/reproducibility.rst
  • Fully backward compatible: Existing code works without changes

• New Examples:

  • Inverted Double Pendulum example using Gymnasium
  • Better Lunar Lander example
  • Reproducibility demonstration scripts

Changed

• Switch to pyproject.toml instead of setup.py
• Dropped support for Python 3.6 and 3.7; neat-python now requires Python 3.8 or newer
• Modernized internal implementation to use Python 3 features (f-strings, type hints, etc.)

Fixed

• Add-node mutation bias behavior: New nodes now start with zero bias for more neutral mutations
• Checkpoint Generation Semantics: Clarified checkpoint numbering and generation alignment
• Population Size Drift: Fixed population size mismatches
• Orphaned Nodes Bug: Fixed handling of nodes with no incoming connections

For complete details, see the CHANGELOG.

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Install: pip install neat-python==1.1.0