Down Sampling Result Never Used

Just found that in the twenty_newsgroups example, the downsampled word list is never used after calculation:

lda2vec/examples/twenty_newsgroups/data/preprocess.py

Line 46 in b7f4642

clean = corpus.subsample_frequent(pruned)

I fixed this by moving the downsampling to an earlier place and changing all the later "pruned" to "clean", but some preprocessing results like vocab.pkl, corpus.pkl, and vectors are still not influenced by the downsampling and the further solution (if needed) seems not straightforward.