Polish code

test=develop

Author: velconia

python/paddle/fluid/layers/nn.py

@@ -5830,24 +5830,25 @@ def rank_loss(label, left, right, name=None):
 
 def margin_rank_loss(label, left, right, margin=0.1, name=None):
     """
-    Margin Rank loss layer for rank problem, which comparing left value and right value be passed in.
-    The rank loss can be defined as below equation:
+    Margin Ranking Loss Layer for ranking problem,
+    which compare left score and right score passed in.
+    The ranking loss can be defined as following equation:
 
     .. math::
 
         rank\_loss &= max(0, -label * (left - right) + margin)
 
     Args:
-       label (Variable): Indicats whether left higher than (right + margin) or not.
-       left (Variable): rank score for left.
-       right (Variable): rank score for right.
-       margin (float): Indicates the margin to be added to right
+       label (Variable): Indicates whether the left is ranked higher than the right or not.
+       left (Variable): ranking score for left.
+       right (Variable): ranking score for right.
+       margin (float): Indicates the given margin to be added to right
        name (str|None): A name for this layer (optional). If set None, the layer
                        will be named automatically.
     Returns:
-       list: The value of rank loss.
+       list: The Variable of ranking loss.
     Raises:
-       ValueError: Any of label, left, and right is not a variable.
+       ValueError: Any of label, left, and right is not a Variable.
     Examples:
         .. code-block:: python
            label = fluid.layers.data(name="label", shape=[4, 1], dtype="float32")
@@ -5862,8 +5863,8 @@ def margin_rank_loss(label, left, right, margin=0.1, name=None):
         raise ValueError("The left should be a Variable")
     if not (isinstance(right, Variable)):
         raise ValueError("The right should be a Variable")
-    out = helper.create_tmp_variable("float32")
-    act = helper.create_tmp_variable("float32")
+    out = helper.create_tmp_variable(left.dtype)
+    act = helper.create_tmp_variable(left.dtype)
     helper.append_op(
         type='margin_rank_loss',
         inputs={"Label": label,