There are several parameters used in the paper, we tune these parameters on the validation set.
we set the number of category-specific topics per category and the number of shared topics in GNMFNC as (K s , K p ) = {(5, 2), (10, 4), (20, 8), (40, 16), (80, 32)}, resulting in K = {57, 114, 228, 456, 912} total number of topics.