fix broken args\n\nFor multiple long options python takes the first a…

…s attribute name by default. The latest commit swapped the order of options that causes the script an error. Added dest option to explicitly specify the valid attribute name (pytorch#454)

imagenet/main.py

@@ -43,11 +43,12 @@
                          'batch size of all GPUs on the current node when '
                          'using Data Parallel or Distributed Data Parallel')
 parser.add_argument('--lr', '--learning-rate', default=0.1, type=float,
-                    metavar='LR', help='initial learning rate')
+                    metavar='LR', help='initial learning rate', dest='lr')
 parser.add_argument('--momentum', default=0.9, type=float, metavar='M',
                     help='momentum')
 parser.add_argument('--wd', '--weight-decay', default=1e-4, type=float,
-                    metavar='W', help='weight decay (default: 1e-4)')
+                    metavar='W', help='weight decay (default: 1e-4)',
+                    dest='weight_decay')
 parser.add_argument('-p', '--print-freq', default=10, type=int,
                     metavar='N', help='print frequency (default: 10)')
 parser.add_argument('--resume', default='', type=str, metavar='PATH',