(JMLR' 19) A Python Toolbox for Scalable Outlier Detection (Anomaly Detection)

Last update: Jan 05, 2023

Overview

Python Outlier Detection (PyOD)

Deployment & Documentation & Stats & License

PyOD is a comprehensive and scalable Python toolkit for detecting outlying objects in multivariate data. This exciting yet challenging field is commonly referred as Outlier Detection or Anomaly Detection.

PyOD includes more than 30 detection algorithms, from classical LOF (SIGMOD 2000) to the latest COPOD (ICDM 2020) and SUOD (MLSys 2021). Since 2017, PyOD has been successfully used in numerous academic researches and commercial products [35] [36]. It is also well acknowledged by the machine learning community with various dedicated posts/tutorials, including Analytics Vidhya, KDnuggets, Towards Data Science, Computer Vision News, and awesome-machine-learning.

PyOD is featured for:

Unified APIs, detailed documentation, and interactive examples across various algorithms.
Advanced models, including classical ones from scikit-learn, latest deep learning methods, and emerging algorithms like COPOD.
Optimized performance with JIT and parallelization when possible, using numba and joblib.
Fast training & prediction with SUOD [36].
Compatible with both Python 2 & 3.

Outlier Detection with 5 Lines of Code:

# train the COPOD detector
from pyod.models.copod import COPOD
clf = COPOD()
clf.fit(X_train)

# get outlier scores
y_train_scores = clf.decision_scores_  # raw outlier scores on the train data
y_test_scores = clf.decision_function(X_test)  # predict raw outlier scores on test

Citing PyOD:

PyOD paper is published in Journal of Machine Learning Research (JMLR) (MLOSS track). If you use PyOD in a scientific publication, we would appreciate citations to the following paper:

@article{zhao2019pyod,
  author  = {Zhao, Yue and Nasrullah, Zain and Li, Zheng},
  title   = {PyOD: A Python Toolbox for Scalable Outlier Detection},
  journal = {Journal of Machine Learning Research},
  year    = {2019},
  volume  = {20},
  number  = {96},
  pages   = {1-7},
  url     = {http://jmlr.org/papers/v20/19-011.html}
}

or:

Zhao, Y., Nasrullah, Z. and Li, Z., 2019. PyOD: A Python Toolbox for Scalable Outlier Detection. Journal of machine learning research (JMLR), 20(96), pp.1-7.

Key Links and Resources:

Table of Contents:

Installation
API Cheatsheet & Reference
Model Save & Load
Fast Train with SUOD
Implemented Algorithms
Algorithm Benchmark
Quick Start for Outlier Detection
How to Contribute
Inclusion Criteria

Installation

It is recommended to use pip or conda for installation. Please make sure the latest version is installed, as PyOD is updated frequently:

pip install pyod            # normal install
pip install --upgrade pyod  # or update if needed

conda install -c conda-forge pyod

Alternatively, you could clone and run setup.py file:

git clone https://github.com/yzhao062/pyod.git
cd pyod
pip install .

Required Dependencies:

Python 2.7, 3.5, 3.6, or 3.7
combo>=0.0.8
joblib
numpy>=1.13
numba>=0.35
scipy>=0.19.1
scikit_learn>=0.20.0
statsmodels

Optional Dependencies (see details below):

combo (optional, required for models/combination.py and FeatureBagging)
keras (optional, required for AutoEncoder, and other deep learning models)
matplotlib (optional, required for running examples)
pandas (optional, required for running benchmark)
suod (optional, required for running SUOD model)
tensorflow (optional, required for AutoEncoder, and other deep learning models)
xgboost (optional, required for XGBOD)

Warning 1: PyOD has multiple neural network based models, e.g., AutoEncoders, which are implemented in both PyTorch and Tensorflow. However, PyOD does NOT install DL libraries for you. This reduces the risk of interfering with your local copies. If you want to use neural-net based models, please make sure Keras and a backend library, e.g., TensorFlow, are installed. Instructions are provided: neural-net FAQ. Similarly, models depending on xgboost, e.g., XGBOD, would NOT enforce xgboost installation by default.

Warning 2: PyOD contains multiple models that also exist in scikit-learn. However, these two libraries' API is not exactly the same--it is recommended to use only one of them for consistency but not mix the results. Refer Differences between scikit-learn and PyOD for more information.

API Cheatsheet & Reference

Full API Reference: (https://pyod.readthedocs.io/en/latest/pyod.html). API cheatsheet for all detectors:

fit(X): Fit detector.
decision_function(X): Predict raw anomaly score of X using the fitted detector.
predict(X): Predict if a particular sample is an outlier or not using the fitted detector.
predict_proba(X): Predict the probability of a sample being outlier using the fitted detector.
predict_confidence(X): Predict the model's sample-wise confidence (available in predict and predict_proba) [26].

Key Attributes of a fitted model:

decision_scores_: The outlier scores of the training data. The higher, the more abnormal. Outliers tend to have higher scores.
labels_: The binary labels of the training data. 0 stands for inliers and 1 for outliers/anomalies.

Fast training and prediction: it is possible to train and predict with a large number of detection models in PyOD by leveraging SUOD framework [36]. See SUOD Paper and repository.

Model Save & Load

PyOD takes a similar approach of sklearn regarding model persistence. See model persistence for clarification.

In short, we recommend to use joblib or pickle for saving and loading PyOD models. See "examples/save_load_model_example.py" for an example. In short, it is simple as below:

from joblib import dump, load

# save the model
dump(clf, 'clf.joblib')
# load the model
clf = load('clf.joblib')

It is known that there are challenges in saving neural network models. Check #328 and #88 for temporary workaround.

Fast Train with SUOD

Fast training and prediction: it is possible to train and predict with a large number of detection models in PyOD by leveraging SUOD framework [36]. See SUOD Paper and SUOD example.

from pyod.models.suod import SUOD

# initialized a group of outlier detectors for acceleration
detector_list = [LOF(n_neighbors=15), LOF(n_neighbors=20),
                 LOF(n_neighbors=25), LOF(n_neighbors=35),
                 COPOD(), IForest(n_estimators=100),
                 IForest(n_estimators=200)]

# decide the number of parallel process, and the combination method
# then clf can be used as any outlier detection model
clf = SUOD(base_estimators=detector_list, n_jobs=2, combination='average',
           verbose=False)

Implemented Algorithms

PyOD toolkit consists of three major functional groups:

(i) Individual Detection Algorithms :

Type	Abbr	Algorithm	Year	Ref
Probabilistic	ECOD	Unsupervised Outlier Detection Using Empirical Cumulative Distribution Functions	2021	[21]
Probabilistic	ABOD	Angle-Based Outlier Detection	2008	[16]
Probabilistic	FastABOD	Fast Angle-Based Outlier Detection using approximation	2008	[16]
Probabilistic	COPOD	COPOD: Copula-Based Outlier Detection	2020	[20]
Probabilistic	MAD	Median Absolute Deviation (MAD)	1993	[13]
Probabilistic	SOS	Stochastic Outlier Selection	2012	[14]
Linear Model	PCA	Principal Component Analysis (the sum of weighted projected distances to the eigenvector hyperplanes)	2003	[31]
Linear Model	MCD	Minimum Covariance Determinant (use the mahalanobis distances as the outlier scores)	1999	[11] [28]
Linear Model	OCSVM	One-Class Support Vector Machines	2001	[30]
Linear Model	LMDD	Deviation-based Outlier Detection (LMDD)	1996	[6]
Proximity-Based	LOF	Local Outlier Factor	2000	[7]
Proximity-Based	COF	Connectivity-Based Outlier Factor	2002	[32]
Proximity-Based	(Incremental) COF	Memory Efficient Connectivity-Based Outlier Factor (slower but reduce storage complexity)	2002	[32]
Proximity-Based	CBLOF	Clustering-Based Local Outlier Factor	2003	[12]
Proximity-Based	LOCI	LOCI: Fast outlier detection using the local correlation integral	2003	[24]
Proximity-Based	HBOS	Histogram-based Outlier Score	2012	[9]
Proximity-Based	kNN	k Nearest Neighbors (use the distance to the kth nearest neighbor as the outlier score)	2000	[27]
Proximity-Based	AvgKNN	Average kNN (use the average distance to k nearest neighbors as the outlier score)	2002	[5]
Proximity-Based	MedKNN	Median kNN (use the median distance to k nearest neighbors as the outlier score)	2002	[5]
Proximity-Based	SOD	Subspace Outlier Detection	2009	[17]
Proximity-Based	ROD	Rotation-based Outlier Detection	2020	[4]
Outlier Ensembles	IForest	Isolation Forest	2008	[22]
Outlier Ensembles	FB	Feature Bagging	2005	[18]
Outlier Ensembles	LSCP	LSCP: Locally Selective Combination of Parallel Outlier Ensembles	2019	[35]
Outlier Ensembles	XGBOD	Extreme Boosting Based Outlier Detection (Supervised)	2018	[34]
Outlier Ensembles	LODA	Lightweight On-line Detector of Anomalies	2016	[25]
Outlier Ensembles	SUOD	SUOD: Accelerating Large-scale Unsupervised Heterogeneous Outlier Detection (Acceleration)	2021	[36]
Neural Networks	AutoEncoder	Fully connected AutoEncoder (use reconstruction error as the outlier score)		[1] [Ch.3]
Neural Networks	VAE	Variational AutoEncoder (use reconstruction error as the outlier score)	2013	[15]
Neural Networks	Beta-VAE	Variational AutoEncoder (all customized loss term by varying gamma and capacity)	2018	[8]
Neural Networks	SO_GAAL	Single-Objective Generative Adversarial Active Learning	2019	[23]
Neural Networks	MO_GAAL	Multiple-Objective Generative Adversarial Active Learning	2019	[23]
Neural Networks	DeepSVDD	Deep One-Class Classification	2018	[29]

(ii) Outlier Ensembles & Outlier Detector Combination Frameworks:

Type	Abbr	Algorithm	Year	Ref
Outlier Ensembles		Feature Bagging	2005	[18]
Outlier Ensembles	LSCP	LSCP: Locally Selective Combination of Parallel Outlier Ensembles	2019	[35]
Outlier Ensembles	XGBOD	Extreme Boosting Based Outlier Detection (Supervised)	2018	[34]
Outlier Ensembles	LODA	Lightweight On-line Detector of Anomalies	2016	[25]
Outlier Ensembles	SUOD	SUOD: Accelerating Large-scale Unsupervised Heterogeneous Outlier Detection (Acceleration)	2021	[36]
Combination	Average	Simple combination by averaging the scores	2015	[2]
Combination	Weighted Average	Simple combination by averaging the scores with detector weights	2015	[2]
Combination	Maximization	Simple combination by taking the maximum scores	2015	[2]
Combination	AOM	Average of Maximum	2015	[2]
Combination	MOA	Maximization of Average	2015	[2]
Combination	Median	Simple combination by taking the median of the scores	2015	[2]
Combination	majority Vote	Simple combination by taking the majority vote of the labels (weights can be used)	2015	[2]

(iii) Utility Functions:

Type	Name	Function	Documentation
Data	generate_data	Synthesized data generation; normal data is generated by a multivariate Gaussian and outliers are generated by a uniform distribution	generate_data
Data	generate_data_clusters	Synthesized data generation in clusters; more complex data patterns can be created with multiple clusters	generate_data_clusters
Stat	wpearsonr	Calculate the weighted Pearson correlation of two samples	wpearsonr
Utility	get_label_n	Turn raw outlier scores into binary labels by assign 1 to top n outlier scores	get_label_n
Utility	precision_n_scores	calculate precision @ rank n	precision_n_scores

Algorithm Benchmark

The comparison among of implemented models is made available below (Figure, compare_all_models.py, Interactive Jupyter Notebooks). For Jupyter Notebooks, please navigate to "/notebooks/Compare All Models.ipynb".

A benchmark is supplied for select algorithms to provide an overview of the implemented models. In total, 17 benchmark datasets are used for comparison, which can be downloaded at ODDS.

For each dataset, it is first split into 60% for training and 40% for testing. All experiments are repeated 10 times independently with random splits. The mean of 10 trials is regarded as the final result. Three evaluation metrics are provided:

The area under receiver operating characteristic (ROC) curve
Precision @ rank n ([email protected])
Execution time

Check the latest benchmark. You could replicate this process by running benchmark.py.

Quick Start for Outlier Detection

PyOD has been well acknowledged by the machine learning community with a few featured posts and tutorials.

Analytics Vidhya: An Awesome Tutorial to Learn Outlier Detection in Python using PyOD Library

KDnuggets: Intuitive Visualization of Outlier Detection Methods, An Overview of Outlier Detection Methods from PyOD

Towards Data Science: Anomaly Detection for Dummies

Computer Vision News (March 2019): Python Open Source Toolbox for Outlier Detection

"examples/knn_example.py" demonstrates the basic API of using kNN detector. It is noted that the API across all other algorithms are consistent/similar.

More detailed instructions for running examples can be found in examples directory.

Initialize a kNN detector, fit the model, and make the prediction.

from pyod.models.knn import KNN   # kNN detector

# train kNN detector
clf_name = 'KNN'
clf = KNN()
clf.fit(X_train)

# get the prediction label and outlier scores of the training data
y_train_pred = clf.labels_  # binary labels (0: inliers, 1: outliers)
y_train_scores = clf.decision_scores_  # raw outlier scores

# get the prediction on the test data
y_test_pred = clf.predict(X_test)  # outlier labels (0 or 1)
y_test_scores = clf.decision_function(X_test)  # outlier scores

# it is possible to get the prediction confidence as well
y_test_pred, y_test_pred_confidence = clf.predict(X_test, return_confidence=True)  # outlier labels (0 or 1) and confidence in the range of [0,1]

Evaluate the prediction by ROC and Precision @ Rank n ([email protected]).

from pyod.utils.data import evaluate_print

# evaluate and print the results
print("\nOn Training Data:")
evaluate_print(clf_name, y_train, y_train_scores)
print("\nOn Test Data:")
evaluate_print(clf_name, y_test, y_test_scores)

See a sample output & visualization.

On Training Data:
KNN ROC:1.0, precision @ rank n:1.0

On Test Data:
KNN ROC:0.9989, precision @ rank n:0.9

visualize(clf_name, X_train, y_train, X_test, y_test, y_train_pred,
    y_test_pred, show_figure=True, save_figure=False)

Visualization (knn_figure):

How to Contribute

You are welcome to contribute to this exciting project:

Please first check Issue lists for "help wanted" tag and comment the one you are interested. We will assign the issue to you.
Fork the master branch and add your improvement/modification/fix.
Create a pull request to development branch and follow the pull request template PR template
Automatic tests will be triggered. Make sure all tests are passed. Please make sure all added modules are accompanied with proper test functions.

To make sure the code has the same style and standard, please refer to abod.py, hbos.py, or feature_bagging.py for example.

You are also welcome to share your ideas by opening an issue or dropping me an email at [email protected] :)

Inclusion Criteria

Similarly to scikit-learn, We mainly consider well-established algorithms for inclusion. A rule of thumb is at least two years since publication, 50+ citations, and usefulness.

However, we encourage the author(s) of newly proposed models to share and add your implementation into PyOD for boosting ML accessibility and reproducibility. This exception only applies if you could commit to the maintenance of your model for at least two year period.

Reference

[1]	Aggarwal, C.C., 2015. Outlier analysis. In Data mining (pp. 237-263). Springer, Cham.

[2]	(1, 2, 3, 4, 5, 6, 7) Aggarwal, C.C. and Sathe, S., 2015. Theoretical foundations and algorithms for outlier ensembles.ACM SIGKDD Explorations Newsletter, 17(1), pp.24-47.

[3]	Aggarwal, C.C. and Sathe, S., 2017. Outlier ensembles: An introduction. Springer.

[4]	Almardeny, Y., Boujnah, N. and Cleary, F., 2020. A Novel Outlier Detection Method for Multivariate Data. IEEE Transactions on Knowledge and Data Engineering.

[5]	(1, 2) Angiulli, F. and Pizzuti, C., 2002, August. Fast outlier detection in high dimensional spaces. In European Conference on Principles of Data Mining and Knowledge Discovery pp. 15-27.

[6]	Arning, A., Agrawal, R. and Raghavan, P., 1996, August. A Linear Method for Deviation Detection in Large Databases. In KDD (Vol. 1141, No. 50, pp. 972-981).

[7]	Breunig, M.M., Kriegel, H.P., Ng, R.T. and Sander, J., 2000, May. LOF: identifying density-based local outliers. ACM Sigmod Record, 29(2), pp. 93-104.

[8]	Burgess, Christopher P., et al. "Understanding disentangling in beta-VAE." arXiv preprint arXiv:1804.03599 (2018).

[9]	Goldstein, M. and Dengel, A., 2012. Histogram-based outlier score (hbos): A fast unsupervised anomaly detection algorithm. In KI-2012: Poster and Demo Track, pp.59-63.

[10]	Gopalan, P., Sharan, V. and Wieder, U., 2019. PIDForest: Anomaly Detection via Partial Identification. In Advances in Neural Information Processing Systems, pp. 15783-15793.

[11]	Hardin, J. and Rocke, D.M., 2004. Outlier detection in the multiple cluster setting using the minimum covariance determinant estimator. Computational Statistics & Data Analysis, 44(4), pp.625-638.

[12]	He, Z., Xu, X. and Deng, S., 2003. Discovering cluster-based local outliers. Pattern Recognition Letters, 24(9-10), pp.1641-1650.

[13]	Iglewicz, B. and Hoaglin, D.C., 1993. How to detect and handle outliers (Vol. 16). Asq Press.

[14]	Janssens, J.H.M., Huszár, F., Postma, E.O. and van den Herik, H.J., 2012. Stochastic outlier selection. Technical report TiCC TR 2012-001, Tilburg University, Tilburg Center for Cognition and Communication, Tilburg, The Netherlands.

[15]	Kingma, D.P. and Welling, M., 2013. Auto-encoding variational bayes. arXiv preprint arXiv:1312.6114.

[16]	(1, 2) Kriegel, H.P. and Zimek, A., 2008, August. Angle-based outlier detection in high-dimensional data. In KDD '08, pp. 444-452. ACM.

[17]	Kriegel, H.P., Kröger, P., Schubert, E. and Zimek, A., 2009, April. Outlier detection in axis-parallel subspaces of high dimensional data. In Pacific-Asia Conference on Knowledge Discovery and Data Mining, pp. 831-838. Springer, Berlin, Heidelberg.

[18]	(1, 2) Lazarevic, A. and Kumar, V., 2005, August. Feature bagging for outlier detection. In KDD '05. 2005.

[19]	Li, D., Chen, D., Jin, B., Shi, L., Goh, J. and Ng, S.K., 2019, September. MAD-GAN: Multivariate anomaly detection for time series data with generative adversarial networks. In International Conference on Artificial Neural Networks (pp. 703-716). Springer, Cham.

[20]	Li, Z., Zhao, Y., Botta, N., Ionescu, C. and Hu, X. COPOD: Copula-Based Outlier Detection. IEEE International Conference on Data Mining (ICDM), 2020.

[21]	Li, Z., Zhao, Y., Hu, X., Botta, N., Ionescu, C. and Chen, H. G. ECOD: Unsupervised Outlier Detection Using Empirical Cumulative Distribution Functions. arXiv preprint arXiv:2201.00382 (2021).

[22]	Liu, F.T., Ting, K.M. and Zhou, Z.H., 2008, December. Isolation forest. In International Conference on Data Mining, pp. 413-422. IEEE.

[23]	(1, 2) Liu, Y., Li, Z., Zhou, C., Jiang, Y., Sun, J., Wang, M. and He, X., 2019. Generative adversarial active learning for unsupervised outlier detection. IEEE Transactions on Knowledge and Data Engineering.

[24]	Papadimitriou, S., Kitagawa, H., Gibbons, P.B. and Faloutsos, C., 2003, March. LOCI: Fast outlier detection using the local correlation integral. In ICDE '03, pp. 315-326. IEEE.

[25]	(1, 2) Pevný, T., 2016. Loda: Lightweight on-line detector of anomalies. Machine Learning, 102(2), pp.275-304.

[26]	Perini, L., Vercruyssen, V., Davis, J. Quantifying the confidence of anomaly detectors in their example-wise predictions. In Joint European Conference on Machine Learning and Knowledge Discovery in Databases (ECML-PKDD), 2020.

[27]	Ramaswamy, S., Rastogi, R. and Shim, K., 2000, May. Efficient algorithms for mining outliers from large data sets. ACM Sigmod Record, 29(2), pp. 427-438.

[28]	Rousseeuw, P.J. and Driessen, K.V., 1999. A fast algorithm for the minimum covariance determinant estimator. Technometrics, 41(3), pp.212-223.

[29]	Ruff, L., Vandermeulen, R., Goernitz, N., Deecke, L., Siddiqui, S.A., Binder, A., Müller, E. and Kloft, M., 2018, July. Deep one-class classification. In International conference on machine learning (pp. 4393-4402). PMLR.

[30]	Scholkopf, B., Platt, J.C., Shawe-Taylor, J., Smola, A.J. and Williamson, R.C., 2001. Estimating the support of a high-dimensional distribution. Neural Computation, 13(7), pp.1443-1471.

[31]	Shyu, M.L., Chen, S.C., Sarinnapakorn, K. and Chang, L., 2003. A novel anomaly detection scheme based on principal component classifier. MIAMI UNIV CORAL GABLES FL DEPT OF ELECTRICAL AND COMPUTER ENGINEERING.

[32]	(1, 2) Tang, J., Chen, Z., Fu, A.W.C. and Cheung, D.W., 2002, May. Enhancing effectiveness of outlier detections for low density patterns. In Pacific-Asia Conference on Knowledge Discovery and Data Mining, pp. 535-548. Springer, Berlin, Heidelberg.

[33]	Wang, X., Du, Y., Lin, S., Cui, P., Shen, Y. and Yang, Y., 2019. adVAE: A self-adversarial variational autoencoder with Gaussian anomaly prior knowledge for anomaly detection. Knowledge-Based Systems.

[34]	(1, 2) Zhao, Y. and Hryniewicki, M.K. XGBOD: Improving Supervised Outlier Detection with Unsupervised Representation Learning. IEEE International Joint Conference on Neural Networks, 2018.

[35]	(1, 2, 3) Zhao, Y., Nasrullah, Z., Hryniewicki, M.K. and Li, Z., 2019, May. LSCP: Locally selective combination in parallel outlier ensembles. In Proceedings of the 2019 SIAM International Conference on Data Mining (SDM), pp. 585-593. Society for Industrial and Applied Mathematics.

[36]	(1, 2, 3, 4, 5, 6) Zhao, Y., Hu, X., Cheng, C., Wang, C., Wan, C., Wang, W., Yang, J., Bai, H., Li, Z., Xiao, C., Wang, Y., Qiao, Z., Sun, J. and Akoglu, L. (2021). SUOD: Accelerating Large-scale Unsupervised Heterogeneous Outlier Detection. Conference on Machine Learning and Systems (MLSys).

Comments

pyod fails to install using pip

When attempting to install without nose, I receive the following error:

(PyVi) Michael:PyVi michael$ pip install pyod
Collecting pyod==0.5.0 (from -r requirements.txt (line 18))
  Using cached https://files.pythonhosted.org/packages/c9/8c/6774fa2e7ae6fe9c2c648114d15ba584f950002377480e14183a0999af30/pyod-0.5.0.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/setup.py", line 2, in <module>
        from pyod import __version__
      File "/private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/pyod/__init__.py", line 4, in <module>
        from . import models
      File "/private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/pyod/models/__init__.py", line 2, in <module>
        from .abod import ABOD
      File "/private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/pyod/models/abod.py", line 17, in <module>
        from .base import BaseDetector
      File "/private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/pyod/models/base.py", line 27, in <module>
        from ..utils.utility import precision_n_scores
      File "/private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/pyod/utils/__init__.py", line 2, in <module>
        from .utility import check_parameter
      File "/private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/pyod/utils/utility.py", line 18, in <module>
        from sklearn.utils.testing import assert_equal
      File "/Users/michael/anaconda3/envs/PyVi/lib/python3.6/site-packages/sklearn/utils/testing.py", line 49, in <module>
        from nose.tools import raises
    ModuleNotFoundError: No module named 'nose'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/j4/_68f6f3j4d51_2smq2mh5hyh0000gn/T/pip-install-gjdzzane/pyod/

bug

opened by mdlockyer 18

LUNAR
All Submissions Basics:

[ ] Have you followed the guidelines in our Contributing document?

[ ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

[ ] Have you checked all Issues to tie the PR to a specific one?

All Submissions Cores:

[ ] Have you added an explanation of what your changes do and why you'd like us to include them?

[ ] Have you written new tests for your core changes, as applicable?

[ ] Have you successfully ran tests with your changes locally?

[ ] Does your submission pass tests, including CircleCI, Travis CI, and AppVeyor?

[ ] Does your submission have appropriate code coverage? The cutoff threshold is 95% by Coversall.

New Model Submissions:

[ ] Have you created a .py in ~/pyod/models/?

[ ] Have you created a _example.py in ~/examples/?

[ ] Have you created a test_.py in ~/pyod/test/?

[ ] Have you lint your code locally prior to submission?
opened by agoodge 17

KNN Mahalanobis distance error

Hi,

When I use the Mahalanobis metric for KNN I always get the error "Must provide either V or VI for Mahalanobis distance" even when I provide V with metric_params. The same request works with sklearn.neighbors.


from pyod.models.knn import KNN  
from pyod.utils.data import generate_data
from sklearn.neighbors import NearestNeighbors
import numpy as np

contamination = 0.1  
n_train = 200  
n_test = 100 

X_train, y_train, X_test, y_test = generate_data(n_train=n_train, n_test=n_test, contamination=contamination)

#Doesn't work (Must provide either V or VI for Mahalanobis distance)
clf = KNN(algorithm='brute', metric='mahalanobis', metric_params={'V': np.cov(X_train)})
clf.fit(X_train)

#Works
nn = NearestNeighbors(algorithm='brute', metric='mahalanobis', metric_params={'V': np.cov(X_train)})
nn.fit(X_train)

bug

opened by hanshupe 12

COF and SOD huge bugs?

Hi all. Something is happening that I cannot understand, I'm doing hyperparameter tuning to all proximity based algorithms with RandomSearchCV form sklearn and only COF and SOD have problems. What is happening is the following: the constructor parameters are all None even though I'm passing values to it. I tried to change the code of SOD and hardcoded the values of the constructor and I'm still getting NoneType. Please help.

opened by dcabanas 11
COPOD Explainability on unseen data

COPOD explain_outlier() function works only for a given data point within the dataset. Is there any approach for explainability on unseen data( data on which model has not been trained) ?

opened by thewall27 10
outlier score highly correlated to over distance to points of origin

I calculated the distance of each data points to origins at 0, by use 'np.linalg.norm(x)', while x is just one multi-variate sample, then normalize all these values to 0-1, I called this 'global_score'. When I compare the global score to scores from different methods, it turns out it's highly correlated (0.99) with PCA, autoencoder, CBLOF, KNN. So it seems all these methods are just calculating the overall distance of the samples, instead of anomalies from multiple clusters. I was very troubled by this fact and hope you can confirm whether this is true and if it is, what's the reason for this.

Thanks

opened by flycloudking 10
R-graph method implemented
R-graph

paper: https://openaccess.thecvf.com/content_cvpr_2017/papers/You_Provable_Self-Representation_Based_CVPR_2017_paper.pdf

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opened by mbongaerts 9
added functionality for scoring the individual features for the COPOD…
… algorithm in copod.py. This includes the single threaded and multi-threaded implementation.

This should also resolve the issue https://github.com/yzhao062/pyod/issues/308

This is my first pull-request in a public repo, so please let me know whether I have included enough information.

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opened by psmgeelen 9
Wrong Label on method SOGAAL and MOGAAL

On the original paper from Xiangnan He, the inliers are marked as 1 and outliers marked as 0. I checked their original code and the code of pyod line by line and are almost the same. On the line https://github.com/yzhao062/pyod/blob/94c27ef3841de4b0e5a732f9c720092a24397633/pyod/models/mo_gaal.py#L79 you state 0 for inliers and 1 for outliers , but in the original paper at page 3, section 3.1, third and fourth line says 0 outlier, 1 inlier. https://arxiv.org/pdf/1809.10816.pdf
bug

opened by luisfelipe18 9
COF Algorithm
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Closes #7

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opened by John-Almardeny 9
SOD implementation
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#60

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opened by John-Almardeny 9
Results from LODA are not reproducible

The function uses numpy.random.randn to sample the random cuts but it does not accept a random_state parameter like most of the other non-deterministic algorithms.

opened by kgmccann 0
Train/Test split or not?

Hi, I have a conceptual question wether I should split my dataset in train/test or not. Given the fact that my dataset has no labels, does it make any sense to split in the first place? I mean, I could simply do something like clf.fit(data) and then get the resulting labels as clf.labels_ and since I train in an unsupervised manner the classifier should not overfit in any way, right?

opened by lorisgir 1
Implementing ECDF Estimator and deleting Statsmodels dependency
Hey everyone,

as stated in #466 and in #453, one can speed up the empirical cumulative density function in comparison to the Statsmodels ECDF functionality.

This also makes the dependency on statsmodels obsolete and this pull request deletes the dependency.

In this pull request the following things are done:

Implementing an standalone ecdf estimator in pyod/utils/stat_models.py

Writing a test that compares own implementation to statsmodels implementation on several random matrices (so in the requirements_ci.txt statsmodels is still a requirement)

Deleting and replacing the functionality in ECOD and COPOD (the only places this dependency has been used

The implementation is now faster (by 30-60%), as we will only use the ecdf for the data we estimate it from. Please get back to me if a further explanation of why exactly is necessary. I will gladly elaborate more.

Since not anyone might want to fully submerge in the topic, I kept the statsmodels dependency in the test and compare this implementation to the statsmodels function on several random matrices. One could see that as prove that it works.

Thanks in advance! :-)

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opened by Lucew 3
Statsmodels package is only used for one function

Hey,

as mentioned in #453 there is a possibility of reimplementing the ECDF estimator from statsmodels in a small function that also runs faster (50-60%) as we are doing the estimation in place and do not use it further.

As you can see from this search, the statsmodels package is only ever used for its ecdf estimator.

Once the tests are through, I will open a pull request for the updated version which does not require statsmodels any more.

Thanks in advance Lucas

opened by Lucew 1
Initializing train weights from a saved model and continuing training

I've trained a multi-class AutoEncoder model using pyod library and saved it as a pickle file. I would like to use the weights from this single, multi-class model, to initialize training of single class AutoEncoder models. How can the training weights be saved, reloaded and how can the training be resumed through PyOD?

opened by alucic2 0
Is 4D (2D) geospatial data anomaly detection supported?

I just discovered this package and I was wondering whether is possible to perform anomaly detection of geospatial data, for example data coming from a network of weather stations which all measure air temperature.

In the past we used either a simple statistical model, that checks if a certain station measured value falls in the IQR of the neighbouring stations, or a supervised model (using SVM) trained with values from neighbouring stations and models. I was wondering if it would be possible to apply one of the model of pyod on this kind of data to identify outliers.

The data can be thought as 4D since we have variable[id_station, time, latitude, longitude], but in practice we always apply the model in 2D as we compare the value of a station to its neighbours. Still, it would be good to have a generalized model that can consider all dimensions at the same time.

Thanks for any info :)

opened by guidocioni 1

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Urgent fix for

File "lib/python3.10/site-packages/pyod/models/iforest.py", line 13, in from sklearn.utils.fixes import _joblib_parallel_args ImportError: cannot import name '_joblib_parallel_args' from 'sklearn.utils.fixes' (/lib/python3.10/site-packages/sklearn/utils/fixes.py)
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v0.9.8(Mar 5, 2022)

v<0.9.8>, <02/23/2022> -- Add Feature Importance for iForest. v<0.9.8>, <03/05/2022> -- Update ECOD (TKDE 2022).

See the usage of feature importance of iforest in https://github.com/yzhao062/pyod/blob/master/examples/iforest_example.py See the new ECOD detector in https://github.com/yzhao062/pyod/blob/master/examples/ecod_example.py
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v0.9.7(Jan 4, 2022)

We add a new detection algorithm called ECOD. See example here: https://github.com/yzhao062/pyod/blob/master/examples/ecod_example.py
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v0.9.6(Dec 25, 2021)

Happy holiday!

v<0.9.6>, <11/05/2021> -- Minor bug fix for COPOD. v<0.9.6>, <12/24/2021> -- Bug fix for MAD (#358). v<0.9.6>, <12/24/2021> -- Bug fix for COPOD plotting (#337). v<0.9.6>, <12/24/2021> -- Model persistence doc improvement.
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v0.9.5(Oct 27, 2021)

In this important update, we introduce multiple important features:

v<0.9.5>, <09/10/2021> -- Update to GitHub Action for autotest! v<0.9.5>, <09/10/2021> -- Various documentation fix. v<0.9.5>, <10/26/2021> -- MAD fix #318. v<0.9.5>, <10/26/2021> -- Automatic histogram size selection for HBOS and LODA #321. v<0.9.5>, <10/27/2021> -- Add prediction confidence #349.
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Urgent fix for breaking changes in scikit-learn 1.0.
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V0.9.3(Aug 29, 2021)

v<0.9.3>, <08/19/2021> -- Expand test to Python 3.8 and 3.9. v<0.9.3>, <08/29/2021> -- Add SUOD.

In this version, SUOD is integrated into PyOD, and fast training/prediction is therefore possible. See https://github.com/yzhao062/pyod/blob/master/examples/suod_example.py for more information.
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V0.9.2(Aug 15, 2021)

This release mainly features a new deep model, DeepSVDD, in PyOD.

v<0.9.2>, <08/15/2021> -- Fix ROD. v<0.9.2>, <08/15/2021> -- Add DeepSVDD (implemented by Rafał Bodziony).
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V0.9.1(Aug 14, 2021)

This release incorporates a few bug fixes and enhancement.

v<0.9.1>, <07/12/2021> -- Improve COPOD by dropping pandas dependency. v<0.9.1>, <07/19/2021> -- Add memory efficienct COF. v<0.9.1>, <08/01/2021> -- Fix Pytorch Dataset issue. v<0.9.1>, <08/14/2021> -- Synchronize scikit-learn LOF parameters.
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v<0.9.0>, <06/20/2021> -- Add clone test for models. v<0.9.0>, <07/03/2021> -- ROD hot fix (#316). v<0.9.0>, <07/04/2021> -- Improve COPOD plot with colunms parameter.
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v<0.8.9>, <05/17/2021> -- Turn on test for Python 3.5-3.8. v<0.8.9>, <06/10/2021> -- Add PyTorch AutoEncoder v<0.8.9>, <06/11/2021> -- Fix LMDD parameter (#307)
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V0.8.8(Apr 27, 2021)

v<0.8.7>, <01/16/2021> -- Add ROD. v<0.8.7>, <02/18/2021> -- Dependency optimization. v<0.8.8>, <04/08/2021> -- COPOD optimization. v<0.8.8>, <04/08/2021> -- Add parallelization for COPOD. v<0.8.8>, <04/26/2021> -- fix XGBOD issue with xgboost 1.4.
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V0.8.6(Jan 12, 2021)

Most the changes are bug-fix and performance enhancement.

v<0.8.5>, <12/22/2020> -- Refactor test from sklearn to numpy v<0.8.5>, <12/22/2020> -- Refactor COPOD for consistency v<0.8.5>, <12/22/2020> -- Refactor due to sklearn 0.24 (issue #265) v<0.8.6>, <01/09/2021> -- Improve COF speed (PR #159) v<0.8.6>, <01/10/2021> -- Fix LMDD parameter inconsistenct. v<0.8.6>, <01/12/2021> -- Add option to specify feature names in copod explanation plot (PR #261).
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V0.8.4(Nov 17, 2020)

v<0.8.4>, <10/13/2020> -- Fix COPOD code inconsistency (issue #239). v<0.8.4>, <10/24/2020> -- Fix LSCP minor bug (issue #180). v<0.8.4>, <11/02/2020> -- Add support for Tensorflow 2. v<0.8.4>, <11/12/2020> -- Merge PR #!02 for categortical data generation.
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V0.8.3(Sep 19, 2020)

v<0.8.2>, <07/04/2020> -- Add a set of utility functions. v<0.8.2>, <08/30/2020> -- Add COPOD and MAD algorithm. v<0.8.3>, <09/01/2020> -- Make decision score consistent. v<0.8.3>, <09/19/2020> -- Add model persistence documentation (save and load).

Short summary, we add two new algorithms COPOD and MAD. Moreover, we now provide a short example regrading model save and load.
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V0.8.1(Jul 1, 2020)

This is a stable release. Python 2 support will be dropped in the next version.

v<0.8.0>, <05/18/2020> -- Update test frameworks by reflecting sklearn change. v<0.8.1>, <07/11/2020> -- Bug fix and documentation update
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V0.7.9(May 4, 2020)

v<0.7.8.1>, <04/07/2020> -- Hot fix for SOD. v<0.7.8.2>, <04/14/2020> -- Bug Fix for LODA. v<0.7.9>, <04/20/2020> -- Relax the number of n_neighbors in ABOD and COF. v<0.7.9>, <05/01/2020> -- Extend Vanilla VAE to Beta VAE by Dr Andrij Vasylenko. v<0.7.9>, <05/01/2020> -- Add Conda Badge.
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V0.7.8(Mar 17, 2020)

Various changes have been made in these two releases:

v<0.7.7>, <12/21/2019> -- Refactor code for combination simplification on combo. v<0.7.7>, <12/21/2019> -- Extended combination methods by median and majority vote. v<0.7.7>, <12/22/2019> -- Code optimization and documentation update. v<0.7.7>, <12/22/2019> -- Enable continuous integration for Python 3.7. v<0.7.7.1>, <12/29/2019> -- Minor update for SUOD and warning fixes. v<0.7.8>, <01/05/2019> -- Documentation update. v<0.7.8>, <01/30/2019> -- Bug fix for kNN (#158). v<0.7.8>, <03/14/2020> -- Add VAE (implemented by Dr Andrij Vasylenko). v<0.7.8>, <03/17/2020> -- Add LODA (adapted from tilitools).

The major improvement includes the addition of VAE and LODA, along with multiple minor fixes.
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v0.7.6(Dec 19, 2019)

v<0.7.6>, <12/18/2019> -- Update Isolation Forest and LOF to be consistent with sklearn 0.22. v<0.7.6>, <12/18/2019> -- Add Deviation-based Outlier Detection (LMDD).

The major update is about the compatibility fix for the newly released sklearn 0.22, and LMDD module built by @John-Almardeny
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v0.7.5(Oct 13, 2019)

This minor update includes the following items (most of them are bug fix and documentation improvement):

v<0.7.5>, <09/24/2019> -- Fix one dimensional data error in LSCP. v<0.7.5>, <10/13/2019> -- Document kNN and Isolation Forest's incoming changes. v<0.7.5>, <10/13/2019> -- SOD optimization (created by John-Almardeny in June). v<0.7.5>, <10/13/2019> -- Documentation updates.
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v0.7.0(Apr 30, 2019)
Multiple bug fixes are introduced:

Fix issue in CBLOF for n_cluster discrepancy.

Fix issue #23 that kNN fails with Mahalanobis distance.

Fix for sklearn new behaviour FutureWarning.

Improved documentation:

Update docs with media coverage.

Major documentation update for JMLR.

Add License info and show support to 996.ICU!

Redesign ReadMe for clarity.

Deprecate two key APIs: fit_predict and fit_predict_score.

Add some new utility functions, e.g., generate_data_clusters.
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v.0.6.7(Jan 29, 2019)
This release further improves package stability and comprehensiveness.

A set of new models are added:

LSCP: Locally Selective Combination of Parallel Outlier Ensembles

XGBOD: Extreme Boosting Based Outlier Detection (Supervised)

SO_GAAL: Single-Objective Generative Adversarial Active Learning

MO_GAAL: Multiple-Objective Generative Adversarial Active Learning

Bug fixes are also included, e.g., CBLOF.

Last but not least, a few functions/models are redesigned/optimized:

Docstring is refactored to numpydoc

LOCI is optimized with numba

visualize function is redesigned

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(JMLR' 19) A Python Toolbox for Scalable Outlier Detection (Anomaly Detection)

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Overview

Python Outlier Detection (PyOD)

Installation

API Cheatsheet & Reference

Model Save & Load

Fast Train with SUOD

Implemented Algorithms

Algorithm Benchmark

Quick Start for Outlier Detection

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Owner

Yue Zhao

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