kremetart

Kalman Real-time Evidence Monitoring Extractor for TART.

Holoscan-driven applications to image — and, in time, detect transients in — data from the Transient Array Radio Telescope (TART). The streaming inference machinery is GPU-resident (CuPy + Holoscan); a CUDA GPU is highly recommended.

Installation

pip install kremetart          # lightweight: hip-cargo + typer only
pip install "kremetart[full]"  # full native stack (CuPy/Holoscan, healpy, xarray, tart-tools, …)

The lightweight install is enough to invoke any command: when the heavy native deps are absent, the CLI transparently dispatches the command into the project's container image. The full install runs everything natively.

Usage

kremetart --help

Producing a movie from the test data

The bundled TART snapshots under tests/data/ are gitignored and fetched on demand from Google Drive the first time you run the test suite. Populate them once (set KREMETART_OFFLINE=1 to skip the download):

uv run pytest tests/test_smoovie.py -q

Then render the snapshots into a HEALPix all-sky movie with smoovie (needs a CUDA GPU and ffmpeg on PATH). smoovie images one frame per sub-integration — the bundled data is nine ~1-minute snapshots of ~1-second sub-integrations, i.e. 540 frames — so render the whole sequence at a watchable frame rate:

uv run kremetart smoovie --hdf-dir tests/data --movie /tmp/tart.mp4 --nside 64 --fps 12 --correct-gains --overlay-catalog

Rendering dominates the runtime (~0.8 s/frame for the three movies), so the full 540-frame render takes a few minutes. For a quick look, cap the number of frames with --nframes — but note this caps the total imaged sub-integrations, and only a few seconds of sky barely moves, so use a generous value (e.g. the first ~2 minutes of sky):

uv run kremetart smoovie --hdf-dir tests/data --movie /tmp/preview.mp4 --nside 64 --fps 12 --nframes 120 --correct-gains --overlay-catalog

Either command writes the dirty all-sky movie (/tmp/tart.mp4) alongside *.filtered.mp4 (the IWP filtered flux), *.znorm.mp4 (the normalised innovation), and a durable *.zarr holding the dirty/filtered/znorm (TIME, PIX) maps. smoovie refuses to overwrite an existing <movie>.zarr — pass --overwrite to replace it. It works on any directory of TART *.hdf snapshots; see kremetart smoovie --help for all options.