Replaces the default "Dec1", "Dec2", ... (decoder / X1 columns
and Cp/Cn/C rows) and "Enc1", "Enc2", ... (encoder / X2 rows and
Cp/Cn/C columns) with user-supplied labels. Propagates to coefficients
tables if present (e.g., from nmfae.inference).
References
Ding, C. H. Q., Li, T., & Jordan, M. I. (2010). Convex and semi-nonnegative matrix factorizations. IEEE Transactions on Pattern Analysis and Machine Intelligence, 32(1), 45–55.