use cls_batch_num replace rec_batch_num (#1298)

tools/infer/predict_cls.py

@@ -37,7 +37,7 @@ logger = get_logger()
 class TextClassifier(object):
     def __init__(self, args):
         self.cls_image_shape = [int(v) for v in args.cls_image_shape.split(",")]
-        self.cls_batch_num = args.rec_batch_num
+        self.cls_batch_num = args.cls_batch_num
         self.cls_thresh = args.cls_thresh
         self.use_zero_copy_run = args.use_zero_copy_run
         postprocess_params = {