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LASSO correlation
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The least absolute shrinkage and selection operator (LASSO) is a regression technique using machine learning that tracks slow correlations among a large collection of time-domain data streams. For gravitational-wave detector characterisation, this technique is used to find correlations between environmental sensors and any noise in the primary strain channel.

.. currentmodule:: gwdetchar.lasso

The core :mod:`gwdetchar.lasso` module provides the following functions:

.. autosummary::

   find_outliers
   remove_outliers
   fit
   find_alpha
   remove_flat
   remove_bad

The :mod:`gwdetchar.lasso.plot` module also provides functions for efficiently writing plots of LASSO data products:

.. autosummary::

   plot.configure_mpl_tex
   plot.save_figure

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Command-line utility
====================

.. note::

   This utility requires authentication with `LIGO.ORG` credentials for archived frame data access.

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gwdetchar.lasso
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The :mod:`gwdetchar.lasso` command-line interface searches for long, slow correlations between one channel identified as a primary (typically gravitational-wave strain) and several other (typically thousands of) auxiliary channels. For a full explanation of the available command-line arguments and options, you can run

.. command-output:: python -m gwdetchar.lasso --help