Creates a node that row-binds the H factors from multiple branches. Allows combining branches with different ranks into a single higher-dimensional representation: k_out = k_1 + k_2 + ...
Examples
data(aml)
inp <- factor_input(aml)
branch1 <- nmf_layer(inp, k = 3)
branch2 <- nmf_layer(inp, k = 5)
combined <- factor_concat(branch1, branch2)