Fix some typos in python code

Author: Abhinav Arora

python/paddle/v2/fluid/framework.py

@@ -39,7 +39,7 @@ def dtype_is_floating(dtype):
     if not isinstance(dtype, core.DataType):
         dtype = convert_np_dtype_to_dtype_(dtype)
 
-    if (dtype == core.DataType.FP16 or dtype == core.DataType.FP16 or
+    if (dtype == core.DataType.FP16 or dtype == core.DataType.FP32 or
             dtype == core.DataType.FP64):
         return True
     else:

python/paddle/v2/fluid/layer_helper.py

@@ -120,7 +120,7 @@ def create_parameter(self, attr, shape, dtype, suffix='w',
         if initializer is not None:
             attr_copy['initializer'] = initializer
         else:
-            attr_copy['initializer'] = _get_default_initializer(dtype)
+            attr_copy['initializer'] = self._get_default_initializer(dtype)
         if attr_copy['name'] is None:
             attr_copy['name'] = unique_name(".".join([self.name, suffix]))
         self.startup_program.global_block().create_parameter(
@@ -204,8 +204,8 @@ def append_activation(self, input_var):
             attrs=act)
         return tmp
 
-    def _get_default_initializer(dtype):
-        if dtype is None or dtype_is_floating(dtype) == True:
+    def _get_default_initializer(self, dtype):
+        if dtype is None or dtype_is_floating(dtype) is True:
             return XavierInitializer()
         else:
             # For integer and boolean types, initialize with all zeros