diff --git a/src/mindspore2022/mindspore/python/mindspore/_extends/graph_kernel/expanders/dropout_grad.py b/src/mindspore2022/mindspore/python/mindspore/_extends/graph_kernel/expanders/dropout_grad.py
index ac7a011f..6293e4de 100644
--- a/src/mindspore2022/mindspore/python/mindspore/_extends/graph_kernel/expanders/dropout_grad.py
+++ b/src/mindspore2022/mindspore/python/mindspore/_extends/graph_kernel/expanders/dropout_grad.py
@@ -13,18 +13,36 @@
 # limitations under the License.
 # ===========================================================================
 """generate json desc for DropoutGrad"""
+# 导入Expander和ExpanderInfoValidator类
 from ._utils import Expander, ExpanderInfoValidator as VLD
 
 
+# 定义DropoutGrad类，继承自Expander类
 @VLD.check_all_formats_same
 @VLD.check_attrs('keep_prob')
 class DropoutGrad(Expander):
     """DropoutGrad expander"""
 
     def _expand(self, graph_builder):
+        """
+        对输入数据进行扩展操作。
+
+        Args:
+            graph_builder (GraphBuilder): 图构建器对象。
+
+        Returns:
+            Tensor: 扩展后的输入数据。
+
+        """
+        # 获取输入数据和掩码
         input_dy, input_mask = self.inputs
+        # 获取保持概率
         keep_prob = self.attrs['keep_prob']
+        # 计算保持概率的倒数
         r_keep_prob = graph_builder.value(input_dy.dtype, 1.0 / keep_prob)
+        # 计算输入数据和保持概率的乘积
         result = graph_builder.emit('Mul', [input_dy, r_keep_prob])
+        # 计算乘积和掩码的乘积
         result = graph_builder.emit('Mul', [result, input_mask])
+        # 返回结果
         return result