Fix description for `--sample-without-replacement` option

fairseq/options.py

@@ -65,7 +65,7 @@ def add_optimization_args(parser):
                        help='weight decay')
     group.add_argument('--sample-without-replacement', default=0, type=int, metavar='N',
                        help='If bigger than 0, use that number of mini-batches for each epoch,'
-                            ' where each sample is drawn randomly with replacement from the'
+                            ' where each sample is drawn randomly without replacement from the'
                             ' dataset')
     return group