fix to not update on dev set for dynet version

Author: Danish Pruthi

04-efficiency/wordemb-skip-binary.py

@@ -93,7 +93,6 @@ def calc_sent_loss(sent):
     my_loss = calc_sent_loss(sent)
     dev_loss += my_loss.value()
     dev_words += len(sent)
-    trainer.update()
   print("iter %r: dev loss/word=%.4f, ppl=%.4f, time=%.2fs" % (ITER, dev_loss/dev_words, math.exp(dev_loss/dev_words), time.time()-start))
 
   print("saving embedding files")

04-efficiency/wordemb-skip-ns.py

@@ -104,7 +104,6 @@ def calc_sent_loss(sent):
     my_loss = calc_sent_loss(sent)
     dev_loss += my_loss.value()
     dev_words += len(sent)
-    trainer.update()
   print("iter %r: dev loss/word=%.4f, ppl=%.4f, time=%.2fs" % (ITER, dev_loss/dev_words, math.exp(dev_loss/dev_words), time.time()-start))
 
   print("saving embedding files")