Outlier Detection Python Packages

pyod

A Python library for anomaly detection across tabular, time series, graph, text, image, and audio data. 60+ detectors, benchmark-backed ADEngine orchestration, and an agentic workflow for AI agents.

cleanlab

Cleanlab's open-source library is the standard data-centric AI package for data quality and machine learning with messy, real-world data and labels.

tsmoothie

A python library for time-series smoothing and outlier detection in a vectorized way.

pynomaly

Anomaly detection using LoOP: Local Outlier Probabilities, a local density based outlier detection method providing an outlier score in the range of [0,1].

minisom

:red_circle: MiniSom is a minimalistic implementation of the Self Organizing Maps

handyspark

HandySpark - bringing pandas-like capabilities to Spark dataframes

suod

(MLSys' 21) An Acceleration System for Large-scare Unsupervised Heterogeneous Outlier Detection (Anomaly Detection)

anomaly-grid-py

Deviation detection using variable-order Markov-chains in finite alphabet sequences

pythresh

Outlier Detection Thresholding

tsod

Anomaly Detection for time series data

dataeval

Python library for analyzing data quality and its impact on model performance across classification and object-detection tasks.

fastdup

fastdup is a powerful, free tool designed to rapidly generate valuable insights from image and video datasets. It helps enhance the quality of both images and labels, while significantly reducing data operation costs, all with unmatched scalability.

dataeval-plots

Python library for analyzing data quality and its impact on model performance across classification and object-detection tasks.

isotree

(Python, R, C/C++) Isolation Forest and variations such as SCiForest and EIF, with some additions (outlier detection + similarity + NA imputation)

robustcov

Robust scatter geometry for anomaly detection, kernels, and ML workflows in Python.

cleanlab-studio

Client interface to Cleanlab Studio

quitefastmst

quitefastmst: Euclidean and Mutual Reachability Minimum Spanning Trees

pygod

A Python Library for Graph Outlier Detection (Anomaly Detection)

adbench

Official Implement of "ADBench: Anomaly Detection Benchmark", NeurIPS 2022.

nonconform

Conformal Anomaly Detection & Change-Point Detection

isolation-forest-onnx

A distributed Spark/Scala implementation of the isolation forest and extended isolation forest algorithms for unsupervised outlier detection, featuring support for scalable training and ONNX export for easy cross-platform inference.

deadwood

Deadwood: Outlier Detection via Pruning Mutual Reachability Minimum Spanning Trees

detectors

Python package to accelerate research on generalized out-of-distribution (OOD) detection.

deepod

Deep learning-based outlier/anomaly detection