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Fix #242 trace_distance to use nuclear norm #243

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Fix #242 trace_distance to use nuclear norm #243

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2 changes: 1 addition & 1 deletion forest/benchmarking/distance_measures.py
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Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,7 @@ def trace_distance(rho: np.ndarray, sigma: np.ndarray) -> float:
:param sigma: Is a dim by dim positive matrix with unit trace.
:return: Trace distance which is a scalar.
"""
return (0.5) * np.linalg.norm(rho - sigma, 1)
return (0.5) * np.linalg.norm(rho - sigma, 'nuc')


def bures_distance(rho: np.ndarray, sigma: np.ndarray) -> float:
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