week5: tsne usage for nlp

[NickVeld]

1. tsne has not a "transform" functionality thus it can not be used for counting embedding of a new entry thus the query neighbors can not be found in embedded space (assume that the query is not in training data)
   (however, the task does not demand on using tsne, but it is not obvious)

2. the seminar notebook encourage to use TSNE with verbose 100 or 1000, but the running time blow up from a few seconds to unknown (I lost my patience after 10 minutes). May be put some warning about it to students?