* Fix SM Model reproducibility bug
vocab is in different order every time, causing unseen words to use
different random states
* Make requirements.txt usable from conda and pip
The existing torch requirement does not work with conda or pip.
Also upgrade pytorch version while we are at it.
With the line as-was the vocab cache was stored as b'the' rather than the, meaning that word2vec wasn't found for terms causing massive performance loss (AP 0.71 cf 0.77).
Matt Crane