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ML engineering pipelines

Feature prep, batch inference, model-serving hooks, and production ML workflow glue.

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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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