Implement the core MEND mechanism: a module duplication mutation that
copies a hidden node with all its incoming and outgoing connections.
This is the single addition MEND makes to standard NEAT.
- ModuleDuplication: JAX-compatible operator using jax.lax.scan
- CombinedMutation: composes DefaultMutation + ModuleDuplication
- DefaultGenome: accepts duplication_rate parameter
- Tests for standalone duplication, combined mutation, and rate=0 no-op
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
1. Add origin_node and origin_conn.
2. Change the behavior of crossover and mutation. Now, TensorNEAT will use all fix_attrs(include historical marker if it has one) as identifier for gene in crossover and distance calculation.
3. Other slightly change.
4. Add two related examples: xor_origin and hopper_origin
5. Add related test file.
