add comments for _extends\graph_kernel\expanders\clip_by_norm_no_div_sum.py

src/mindspore2022/mindspore/python/mindspore/_extends/graph_kernel/expanders/clip_by_norm_no_div_sum.py

@@ -21,13 +21,28 @@ class ClipByNormNoDivSum(Expander):
     """ClipByNormNoDivSum expander"""
 
     def _expand(self, graph_builder):
+        """
+        对输入的张量进行计算，返回计算结果。
+
+        Args:
+            graph_builder (GraphBuilder): 图构建器对象，用于生成计算图。
+
+        Returns:
+            Tensor: 计算结果张量。
+
+        """
         input_x0, input_x1, input_x2, input_x3 = self.inputs
 
         # cal result
+        # 计算大于结果
         greater_res = graph_builder.emit('Greater', [input_x0, input_x1])
+        # 根据大于结果选择input_x0或input_x2
         select_res0 = graph_builder.emit('Select', [greater_res, input_x0, input_x2])
+        # 计算select_res0的平方根
         sqrt_res = graph_builder.emit('Sqrt', [select_res0])
+        # 根据大于结果选择sqrt_res或input_x0
         select_res1 = graph_builder.emit('Select', [greater_res, sqrt_res, input_x0])
+        # 计算select_res1和input_x3的最大值
         result = graph_builder.emit('Maximum', [select_res1, input_x3])
 
         return result