Galactos: computing the anisotropic 3-point correlation function for 2 billion galaxies. - Brian Friesen; Md. Mostofa Ali Patwary; Brian Austin; Nadathur Satish; Zachary Slepian; Narayanan Sundaram; Deborah Bard; Daniel J. Eisenstein; Jack Deslippe; Pradeep Dubey; Prabhat (SC, 2017)