Issues in 'run_20_newgroups.py' when load_embed = False

[dbl001]

1. vocab_size does not get set with load_embed = False
   E.g.

vocab_size = embed_matrix.shape[0] 

2. utils.load_preprocessed_data() returns 6 parameters (not 7) when load_embed = False

(idx_to_word, word_to_idx, freqs, pivot_ids,
 target_ids, doc_ids, **_embed_matrix_**) = utils.load_preprocessed_data(data_path, load_embed_matrix=load_embeds)

[dbl001]

Perhaps:

vocab_size = embed_matrix.shape[0] if load_embeds else len(idx_to_word)