Alert Classification for the ALeRCE Broker System: The Real-time Stamp Classifier. - Rodrigo Carrasco-Davis; Esteban Reyes; Camilo Valenzuela; Francisco Förster; Pablo A. Estévez; Giuliano Pignata; Franz E. Bauer; Ignacio Reyes; Paula Sánchez-Sáez; Guillermo Cabrera-Vives; Susana Eyheramendy; Márcio Catelán; et al. (CoRR, 2020)