82 releases
new 0.5.4 | Mar 15, 2023 |
---|---|
0.5.2 | Nov 10, 2022 |
0.5.0 | Jun 14, 2022 |
0.4.1 | Dec 10, 2021 |
0.1.8 | Oct 29, 2019 |
#36 in Science
2,452 downloads per month
1.5MB
10K
SLoC
light-curve-feature
light-curve-feature
is a part of light-curve
family that
implements extraction of numerous light curve features used in astrophysics.
If you are looking for Python bindings for this package, please see https://github.com/light-curve/light-curve-python
All features are available in Feature enum, and the recommended way to extract multiple features at
once is FeatureExtractor struct built from a Vec<Feature>
. Data is represented by
TimeSeries struct built from time, magnitude (or flux) and weight arrays, all having the same length. Note
that multiple features interpret weight array as inversed squared observation errors.
use light_curve_feature::prelude::*;
// Let's find amplitude and reduced Chi-squared of the light curve
let fe = FeatureExtractor::from_features(vec![
Amplitude::new().into(),
ReducedChi2::new().into()
]);
// Define light curve
let time = [0.0, 1.0, 2.0, 3.0, 4.0];
let magn = [-1.0, 2.0, 1.0, 3.0, 4.5];
let weights = [5.0, 10.0, 2.0, 10.0, 5.0]; // inverse squared magnitude errors
let mut ts = TimeSeries::new(&time, &magn, &weights);
// Get results and print
let result = fe.eval(&mut ts)?;
let names = fe.get_names();
println!("{:?}", names.iter().zip(result.iter()).collect::<Vec<_>>());
# Ok::<(), EvaluatorError>(())
There are a couple of meta-features, which transform a light curve before feature extraction. For example Bins feature accumulates data inside time-windows and extracts features from this new light curve.
use light_curve_feature::prelude::*;
use ndarray::Array1;
// Define features, "raw" MaximumSlope and binned with zero offset and 1-day window
let max_slope: Feature<_> = MaximumSlope::default().into();
let bins: Feature<_> = {
let mut bins = Bins::new(1.0, 0.0);
bins.add_feature(max_slope.clone());
bins.into()
};
let fe = FeatureExtractor::from_features(vec![max_slope, bins]);
// Define light curve
let time = [0.1, 0.2, 1.1, 2.1, 2.1];
let magn = [10.0, 10.1, 10.5, 11.0, 10.9];
// We don't need weight for MaximumSlope, this would assign unity weight
let mut ts = TimeSeries::new_without_weight(&time, &magn);
// Get results and print
let result = fe.eval(&mut ts)?;
println!("{:?}", result);
# Ok::<(), EvaluatorError>(())
Cargo features
The crate is configured with the following Cargo features:
ceres-system
andceres-source
- enable Ceres Solver support for non-linear fitting. The former uses system-wide installation of Ceres, the latter builds Ceres from source and links it statically. The latter overrides the former. Seeceres-solver-rs
crate for detailsfftw-system
,fftw-source
(enabled by default) andfftw-mkl
- enable FFTW support for Fourier transforms needed byPeriodogram
. The first uses system-wide installation of FFTW, the second builds FFTW from source and links it statically, the last downloads and links statically Intel MKL instead of FFTW.gsl
- enables GNU Scientific Library support for non-linear fitting.default
- enablesfftw-source
feature only, has no side effects.
Citation
If you found this project useful for your research please cite Malanchev et al., 2021
@ARTICLE{2021MNRAS.502.5147M,
author = {{Malanchev}, K.~L. and {Pruzhinskaya}, M.~V. and {Korolev}, V.~S. and {Aleo}, P.~D. and {Kornilov}, M.~V. and {Ishida}, E.~E.~O. and {Krushinsky}, V.~V. and {Mondon}, F. and {Sreejith}, S. and {Volnova}, A.~A. and {Belinski}, A.~A. and {Dodin}, A.~V. and {Tatarnikov}, A.~M. and {Zheltoukhov}, S.~G. and {(The SNAD Team)}},
title = "{Anomaly detection in the Zwicky Transient Facility DR3}",
journal = {\mnras},
keywords = {methods: data analysis, astronomical data bases: miscellaneous, stars: variables: general, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Solar and Stellar Astrophysics},
year = 2021,
month = apr,
volume = {502},
number = {4},
pages = {5147-5175},
doi = {10.1093/mnras/stab316},
archivePrefix = {arXiv},
eprint = {2012.01419},
primaryClass = {astro-ph.IM},
adsurl = {https://ui.adsabs.harvard.edu/abs/2021MNRAS.502.5147M},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
Dependencies
~8–13MB
~258K SLoC