Source code for

Anomaly detection in the Zwicky Transient Facility DR3

This guide allows you to use the ZTF anomaly detection tool presented by Malanchev et al., 2020.

Package installation

Install current version by

pip install git+https://github.com/snad-space/zwad

Development

Before working with the code, the package should be installed in the development mode:

git clone [email protected]:snad-space/zwad.git
cd zwad
pip install -e .

Data download

Light curve feature data for ZTF DR3 fields used in the research are available on Zenodo. You can download it from the website or by:

cd data
zwad-zenodo

Example

# Run one algorithm
zwadp -c iso --oid oid_m31.dat --feature feature_m31.dat > m31_iso.csv

# zwadp uses only one core by default. Number of parallel
# jobs may be increased with the -j option.
zwadp -c iso -j 4 --oid oid_m31.dat --feature feature_m31.dat > m31_iso.csv

# Run a few more algorithms
for ALGO in iso lof gmm svm; do
  zwadp -c ${ALGO} --oid oid_m31.dat --feature feature_m31.dat > m31_${ALGO}.csv
done

# Combine data-sets:
zwadp -c iso --oid oid_m31.dat --oid fakes/oid_m31_fake.dat --feature feature_m31.dat --feature fakes/feature_m31_fake.dat > m31_iso_fake.csv

# See the help
zwadp -h

Active anomaly detection

Lets use the same data from Zenodo.

cd data
zwad-zenodo

It is better to create temporary directory to run active anomaly detection:

mkdir ../tmp
cd ../tmp

# Run AAD algorithm with M31 dataset
zwaad --random_seed 42 --budget 4 --oid ../data/oid_m31.dat --feature ../data/feature_m31.dat --feature-names ../data/feature_m31.name --anomalies my_anomalies.txt aad

The script output may be as the following:

Check https://ztf.snad.space/dr4/view/695211400088968 for details
Is 695211400088968 anomaly? [y/N]: y

It is waiting for our decision now. Let us decide that 695211400088968 is an anomaly and continue:

Check https://ztf.snad.space/dr4/view/695211400088968 for details
Is 695211400088968 anomaly? [y/N]: y
Check https://ztf.snad.space/dr4/view/695211400053697 for details
Is 695211400053697 anomaly? [y/N]: n
Check https://ztf.snad.space/dr4/view/695211100037499 for details
Is 695211100037499 anomaly? [y/N]: n
Check https://ztf.snad.space/dr4/view/695211200008024 for details
Is 695211200008024 anomaly? [y/N]: y

Now we have examined all four samples within our budget.

# Check found anomalies
cat my_anomalies.txt
695211400088968
695211200008024

Related repositories

• SNAD ZTF DR web-viewer
• Light-curve features
• SNAD ZTF DR API
• SNAD Light-curve feature API
• SNAD OGLE-III metadata API
• SNAD ZTF Periodic Catalog API