From e72e78e2ec4b8cbd671329b250b35344cf817bcb Mon Sep 17 00:00:00 2001
From: anzhengqi <anzhengqi.huawei.com>
Date: Fri, 7 Aug 2020 20:06:50 +0800
Subject: [PATCH] update api document

---
 mindspore/dataset/transforms/c_transforms.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mindspore/dataset/transforms/c_transforms.py b/mindspore/dataset/transforms/c_transforms.py
index 41a31e7c50..0f3c8d145b 100644
--- a/mindspore/dataset/transforms/c_transforms.py
+++ b/mindspore/dataset/transforms/c_transforms.py
@@ -31,7 +31,10 @@ class OneHot(cde.OneHotOp):
     Tensor operation to apply one hot encoding.
 
     Args:
-        num_classes (int): Number of classes of the label.
+        num_classes (int): Number of classes of the label, it should be bigger than feature size.
+
+    Raises:
+        RuntimeError: feature size is bigger than num_classes.
     """
 
     @check_num_classes