Add API example for logical ops and clip ops

test=develop

python/paddle/fluid/layers/nn.py

@@ -7702,6 +7702,15 @@ def logical_and(x, y, out=None, name=None):
 
     Returns:
         out(${out_type}): ${out_comment}
+
+    Examples:
+        .. code-block:: python
+
+            left = fluid.layers.data(
+                name='left', shape=[1], dtype='int32')
+            right = fluid.layers.data(
+                name='right', shape=[1], dtype='int32')
+            result = fluid.layers.logical_and(x=left, y=right)
     """
 
     return _logical_op(
@@ -7721,6 +7730,15 @@ def logical_or(x, y, out=None, name=None):
 
     Returns:
         out(${out_type}): ${out_comment}
+
+    Examples:
+        .. code-block:: python
+
+            left = fluid.layers.data(
+                name='left', shape=[1], dtype='int32')
+            right = fluid.layers.data(
+                name='right', shape=[1], dtype='int32')
+            result = fluid.layers.logical_or(x=left, y=right)
     """
 
     return _logical_op(
@@ -7740,6 +7758,15 @@ def logical_xor(x, y, out=None, name=None):
 
     Returns:
         out(${out_type}): ${out_comment}
+
+    Examples:
+        .. code-block:: python
+
+            left = fluid.layers.data(
+                name='left', shape=[1], dtype='int32')
+            right = fluid.layers.data(
+                name='right', shape=[1], dtype='int32')
+            result = fluid.layers.logical_xor(x=left, y=right)
     """
 
     return _logical_op(
@@ -7758,6 +7785,13 @@ def logical_not(x, out=None, name=None):
 
     Returns:
         out(${out_type}): ${out_comment}
+
+    Examples:
+        .. code-block:: python
+
+            left = fluid.layers.data(
+                name='left', shape=[1], dtype='int32')
+            result = fluid.layers.logical_not(x=left)
     """
 
     return _logical_op(
@@ -7777,6 +7811,13 @@ def clip(x, min, max, name=None):
 
     Returns:
         out(${out_type}): ${out_comment}
+
+    Examples:
+        .. code-block:: python
+
+            input = fluid.layers.data(
+                name='data', shape=[1], dtype='float32')
+            reward = fluid.layers.clip(x=input, min=-1.0, max=1.0)
     """
 
     helper = LayerHelper("clip", **locals())
@@ -7809,6 +7850,13 @@ def clip_by_norm(x, max_norm, name=None):
 
     Returns:
         out(${out_type}): ${out_comment}
+
+    Examples:
+        .. code-block:: python
+
+            input = fluid.layers.data(
+                name='data', shape=[1], dtype='float32')
+            reward = fluid.layers.clip_by_norm(x=input, max_norm=1.0)
     """
 
     helper = LayerHelper("clip_by_norm", **locals())