remove shlex.quote in scripts/spm_train.py (#972)

Summary:
to resolve the issue https://github.com/pytorch/fairseq/issues/971
Pull Request resolved: https://github.com/pytorch/fairseq/pull/972

Differential Revision: D16892827

Pulled By: myleott

fbshipit-source-id: baf277961f1e292f4593eefe31e3541aa9d0d8c4

scripts/spm_train.py

@@ -7,11 +7,10 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 
-import shlex
 import sys
 
 import sentencepiece as spm
 
 
 if __name__ == "__main__":
-    spm.SentencePieceTrainer.Train(" ".join(map(shlex.quote, sys.argv[1:])))
+    spm.SentencePieceTrainer.Train(" ".join(sys.argv[1:]))