feat(decoupler_gpu): add zscore implementation with CuPy #470
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Hi,
I've implemented zscore with CuPy from decoupler. This version leverages CuPy for matrix operations and uses CuPy’s erfc function for p-value calculation.
Changes
_method_zscore.pywith CuPy-based zscore implementationcupyx.scipy.special.erfcfor two-sided p-value computation__init__.pyand API docs to expose zscoretest_zscore.pyto validate consistency with NumPy/SciPy implementation