fix exception bug and one_hot expand; test=develop

Author: phlrain

python/paddle/fluid/clip.py

@@ -21,6 +21,7 @@
 from . import layers
 from . import framework
 from . import core
+from .dygraph import not_support
 
 __all__ = [
     'ErrorClipByValue',
@@ -335,6 +336,7 @@ def _create_operators(self, param, grad):
         return param, new_grad
 
 
+@not_support
 def set_gradient_clip(clip, param_list=None, program=None):
     """
     To specify parameters that require gradient clip.

python/paddle/fluid/framework.py

@@ -655,7 +655,7 @@ def dtype(self):
     def lod_level(self):
         # TODO(minqiyang): Support lod_level in dygraph mode
         if in_dygraph_mode():
-            raise Exception, "Dygraph model DO NOT supprt lod"
+            raise Exception("Dygraph model DO NOT supprt lod")
         return self.desc.lod_level()
 
     @property

python/paddle/fluid/layers/nn.py

@@ -6576,6 +6576,7 @@ def one_hot(input, depth):
             inputs = {'X': input}
             attrs = {'depth': depth}
         else:
+            depth.stop_gradient = True
             inputs = {'X': input, 'depth_tensor': depth}
             attrs = {}
     helper.append_op(
@@ -9355,6 +9356,7 @@ def contain_tensor(expand_times):
             new_expand_times = []
             for ele in expand_times:
                 if isinstance(ele, Variable):
+                    ele.stop_gradient = True
                     new_expand_times.append(ele)
                 else:
                     assert (isinstance(ele, int))