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How to Detect Data Drift with PSI in Python

Calculate the Population Stability Index (PSI) in Python to compare expected vs actual distributions and detect data drift in machine learning pipelines.

data drift psi monitoring

Python

import numpy as np

def calculate_psi(expected, actual, buckets=10):
    """Calculate Population Stability Index (PSI) between two distributions."""
    # Create bucket edges based on expected distribution percentiles
    edges = np.percentile(expected, np.linspace(0, 100, buckets + 1))
    edges[-1] = np.inf  # Ensur…

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