An open source project from Data to AI Lab at MIT.

Orion

A machine learning library for unsupervised time series anomaly detection.

Important Links
💻 Website	Check out the Sintel Website for more information about the project.
📖 Documentation	Quickstarts, User and Development Guides, and API Reference.
⭐ Tutorials	Checkout our notebooks
Repository	The link to the Github Repository of this library.
📜 License	The repository is published under the MIT License.
Community	Join our Slack Workspace for announcements and discussions.

Overview

Orion is a machine learning library built for unsupervised time series anomaly detection. With a given time series data, we provide a number of “verified” ML pipelines (a.k.a Orion pipelines) that identify rare patterns and flag them for expert review.

The library makes use of a number of automated machine learning tools developed under Data to AI Lab at MIT.

Read about using an Orion pipeline on NYC taxi dataset in a blog series:

Part 1: Learn about unsupervised time series anomaly detection	Part 2: Learn how we use GANs to solving the problem?	Part 3: How does one evaluate anomaly detection pipelines?

Notebooks: Discover Orion through colab by launching our notebooks!

Quickstart

Install with pip

The easiest and recommended way to install Orion is using pip:

pip install orion-ml

This will pull and install the latest stable release from PyPi.

In the following example we show how to use one of the Orion Pipelines.

Fit an Orion pipeline

We will load a demo data for this example:

from orion.data import load_signal

train_data = load_signal('S-1-train')
train_data.head()

which should show a signal with timestamp and value.

    timestamp     value
0  1222819200 -0.366359
1  1222840800 -0.394108
2  1222862400  0.403625
3  1222884000 -0.362759
4  1222905600 -0.370746

In this example we use aer pipeline and set some hyperparameters (in this case training epochs as 5).

from orion import Orion

hyperparameters = {
    'orion.primitives.aer.AER#1': {
        'epochs': 5,
        'verbose': True
    }
}

orion = Orion(
    pipeline='aer',
    hyperparameters=hyperparameters
)

orion.fit(train_data)

Detect anomalies using the fitted pipeline

Once it is fitted, we are ready to use it to detect anomalies in our incoming time series:

new_data = load_signal('S-1-new')
anomalies = orion.detect(new_data)

⚠️ Depending on your system and the exact versions that you might have installed some WARNINGS may be printed. These can be safely ignored as they do not interfere with the proper behavior of the pipeline.

The output of the previous command will be a pandas.DataFrame containing a table of detected anomalies:

        start         end  severity
0  1402012800  1403870400  0.122539

Leaderboard

In every release, we run Orion benchmark. We maintain an up-to-date leaderboard with the current scoring of the verified pipelines according to the benchmarking procedure.

We run the benchmark on 11 datasets with their known grounth truth. We record the score of the pipelines on each datasets. To compute the leaderboard table, we showcase the number of wins each pipeline has over the ARIMA pipeline.

Pipeline	Outperforms ARIMA
AER	10
TadGAN	7
LSTM Dynamic Thresholding	7
LSTM Autoencoder	6
Dense Autoencoder	6
VAE	6
GANF	6
Azure	0

You can find the scores of each pipeline on every signal recorded in the details Google Sheets document. The summarized results can also be browsed in the following summary Google Sheets document.

Resources

Additional resources that might be of interest:

• Learn about benchmarking pipelines.
• Read about pipeline evaluation.
• Find out more about TadGAN.

Citation

If you use AER for your research, please consider citing the following paper:

Lawrence Wong, Dongyu Liu, Laure Berti-Equille, Sarah Alnegheimish, Kalyan Veeramachaneni. AER: Auto-Encoder with Regression for Time Series Anomaly Detection.

@inproceedings{wong2022aer,
  title={AER: Auto-Encoder with Regression for Time Series Anomaly Detection},
  author={Wong, Lawrence and Liu, Dongyu and Berti-Equille, Laure and Alnegheimish, Sarah and Veeramachaneni, Kalyan},
  booktitle={2022 IEEE International Conference on Big Data (IEEE BigData)},
  pages={1152-1161},
  doi={10.1109/BigData55660.2022.10020857},
  organization={IEEE},
  year={2022}
}

If you use TadGAN for your research, please consider citing the following paper:

Alexander Geiger, Dongyu Liu, Sarah Alnegheimish, Alfredo Cuesta-Infante, Kalyan Veeramachaneni. TadGAN - Time Series Anomaly Detection Using Generative Adversarial Networks.

@inproceedings{geiger2020tadgan,
  title={TadGAN: Time Series Anomaly Detection Using Generative Adversarial Networks},
  author={Geiger, Alexander and Liu, Dongyu and Alnegheimish, Sarah and Cuesta-Infante, Alfredo and Veeramachaneni, Kalyan},
  booktitle={2020 IEEE International Conference on Big Data (IEEE BigData)},
  pages={33-43},
  doi={10.1109/BigData50022.2020.9378139},
  organization={IEEE},
  year={2020}
}

If you use Orion which is part of the Sintel ecosystem for your research, please consider citing the following paper:

Sarah Alnegheimish, Dongyu Liu, Carles Sala, Laure Berti-Equille, Kalyan Veeramachaneni. Sintel: A Machine Learning Framework to Extract Insights from Signals.

@inproceedings{alnegheimish2022sintel,
  title={Sintel: A Machine Learning Framework to Extract Insights from Signals},
  author={Alnegheimish, Sarah and Liu, Dongyu and Sala, Carles and Berti-Equille, Laure and Veeramachaneni, Kalyan},  
  booktitle={Proceedings of the 2022 International Conference on Management of Data},
  pages={1855–1865},
  numpages={11},
  publisher={Association for Computing Machinery},
  doi={10.1145/3514221.3517910},
  series={SIGMOD '22},
  year={2022}
}