Description

Kats is a toolkit to analyze time series data, a lightweight, easy-to-use, and generalizable framework to perform time series analysis. Time series analysis is an essential component of Data Science and Engineering work at industry, from understanding the key statistics and characteristics, detecting regressions and anomalies, to forecasting future trends. Kats aims to provide the one-stop shop for time series analysis, including detection, forecasting, feature extraction/embedding, multivariate analysis, etc.

Kats is released by Facebook's Infrastructure Data Science team. It is available for download on PyPI.

Important links

• Homepage: https://facebookresearch.github.io/Kats/
• Kats Python package: https://pypi.org/project/kats/
• Facebook Engineering Blog Post: https://engineering.fb.com/2021/06/21/open-source/kats/
• Source code repository: https://github.com/facebookresearch/kats
• Contributing: https://github.com/facebookresearch/Kats/blob/master/CONTRIBUTING.md
• Tutorials: https://github.com/facebookresearch/Kats/tree/master/tutorials

Installation in Python

Kats is on PyPI, so you can use pip to install it.

bash pip install --upgrade pip pip install kats

If you need only a small subset of Kats, you can install a minimal version of Kats with bash MINIMAL_KATS=1 pip install kats which omits many dependencies (everything in test_requirements.txt). However, this will disable many functionalities and cause import kats to log warnings. See setup.py for full details and options.

Examples

Here are a few sample snippets from a subset of Kats offerings:

Forecasting

Using Prophet model to forecast the air_passengers data set.

```python import pandas as pd

from kats.consts import TimeSeriesData from kats.models.prophet import ProphetModel, ProphetParams

take air_passengers data as an example

airpassengersdf = pd.readcsv( "../kats/data/airpassengers.csv", header=0, names=["time", "passengers"], )

convert to TimeSeriesData object

airpassengersts = TimeSeriesData(airpassengersdf)

create a model param instance

params = ProphetParams(seasonality_mode='multiplicative') # additive mode gives worse results

create a prophet model instance

m = ProphetModel(airpassengersts, params)

fit model simply by calling m.fit()

m.fit()

make prediction for next 30 month

fcst = m.predict(steps=30, freq="MS") ```

Detection

Using CUSUM detection algorithm on simulated data set.

```python

import packages

import numpy as np import pandas as pd

from kats.consts import TimeSeriesData from kats.detectors.cusum_detection import CUSUMDetector

simulate time series with increase

np.random.seed(10) dfincrease = pd.DataFrame( { 'time': pd.daterange('2019-01-01', '2019-03-01'), 'increase':np.concatenate([np.random.normal(1,0.2,30), np.random.normal(2,0.2,30)]), } )

convert to TimeSeriesData object

timeseries = TimeSeriesData(df_increase)

run detector and find change points

change_points = CUSUMDetector(timeseries).detector() ```

TSFeatures

We can extract meaningful features from the given time series data

```python

Initiate feature extraction class

import pandas as pd from kats.consts import TimeSeriesData from kats.tsfeatures.tsfeatures import TsFeatures

take air_passengers data as an example

airpassengersdf = pd.readcsv( "../kats/data/airpassengers.csv", header=0, names=["time", "passengers"], )

convert to TimeSeriesData object

airpassengersts = TimeSeriesData(airpassengersdf)

calculate the TsFeatures

features = TsFeatures().transform(airpassengersts) ```

Citing Kats

If you use Kats in your work or research, please use the following BibTeX entry.

@software{Jiang_KATS_2022, author = {Jiang, Xiaodong and Srivastava, Sudeep and Chatterjee, Sourav and Yu, Yang and Handler, Jeffrey and Zhang, Peiyi and Bopardikar, Rohan and Li, Dawei and Lin, Yanjun and Thakore, Uttam and Brundage, Michael and Holt, Ginger and Komurlu, Caner and Nagalla, Rakshita and Wang, Zhichao and Sun, Hechao and Gao, Peng and Cheung, Wei and Gao, Jun and Wang, Qi and Guerard, Marius and Kazemi, Morteza and Chen, Yulin and Zhou, Chong and Lee, Sean and Laptev, Nikolay and Levendovszky, Tihamér and Taylor, Jake and Qian, Huijun and Zhang, Jian and Shoydokova, Aida and Singh, Trisha and Zhu, Chengjun and Baz, Zeynep and Bergmeir, Christoph and Yu, Di and Koylan, Ahmet and Jiang, Kun and Temiyasathit, Ploy and Yurtbay, Emre}, license = {MIT License}, month = {3}, title = {{Kats}}, url = {https://github.com/facebookresearch/Kats}, version = {0.2.0}, year = {2022} }

Changelog

Version 0.2.0

• Forecasting
  • Added global model, a neural network forecasting model
  • Added global model tutorial
  • Consolidated backtesting APIs and some minor bug fixes
• Detection
  • Added model optimizer for anomaly/ changepoint detection
  • Added evaluators for anomaly/changepoint detection
  • Improved simulators, to build synthetic data and inject anomalies
  • Added new detectors: ProphetTrendDetector, Dynamic Time Warping based detectors
  • Support for meta-learning, to recommend anomaly detection algorithms and parameters for your dataset
  • Standardized API for some of our legacy detectors: OutlierDetector, MKDetector
  • Support for Seasonality Removal in StatSigDetector
• TsFeatures
  • Added time-based features
• Others
  • Bug fixes, code coverage improvement, etc.

Version 0.1.0

• Initial release

Contributors

Kats is currentely maintaned by community with the main contributions and leading from Nickolai Kniazev and Peter Shaffery

Kats is a project with several skillful researchers and engineers contributing to it. Kats was started and built by Xiaodong Jiang with major contributions coming from many talented individuals in various forms and means. A non-exhaustive but growing list needs to mention: Sudeep Srivastava, Sourav Chatterjee, Jeff Handler, Rohan Bopardikar, Dawei Li, Yanjun Lin, Yang Yu, Michael Brundage, Caner Komurlu, Rakshita Nagalla, Zhichao Wang, Hechao Sun, Peng Gao, Wei Cheung, Jun Gao, Qi Wang, Morteza Kazemi, Tihamér Levendovszky, Jian Zhang, Ahmet Koylan, Kun Jiang, Aida Shoydokova, Ploy Temiyasathit, Sean Lee, Nikolay Pavlovich Laptev, Peiyi Zhang, Emre Yurtbay, Daniel Dequech, Rui Yan, William Luo, Marius Guerard, Pietari Pulkkinen, Uttam Thakore, Trisha Singh, Huijun Qian, Chengjun Zhu, Di Yu, Zeynep Erkin Baz, and Christoph Bergmeir.

License

Kats is licensed under the MIT license.