Fix scalar conversion error with NumPy 2.x #31
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This PR fixes a NumPy 2.x compatibility issue in the crossover probability update.
np.where(...)[0]returns a 1-D array; converting it withint()fails underNumPy ≥ 2.0 with:
The fix replaces the implicit conversion with an explicit scalar extraction
using
.item().Tested locally with NumPy 2.4.6