Don't create tf.Variables for label smoothing
Don't create tf.Variables for label smoothing

EdinburghNLP/nematus,rsennrich/nematus,EdinburghNLP/nematus,rsennrich/nematus,rsennrich/nematus,rsennrich/nematus,EdinburghNLP/nematus,rsennrich/nematus,EdinburghNLP/nematus,EdinburghNLP/nematus,rsennrich/nematus,EdinburghNLP/nematus