layer fixes (#14591)

* layer fixes test=develop

* follow update test=develop

python/paddle/fluid/layers/layer_function_generator.py

@@ -20,7 +20,7 @@ import string
 
 from six.moves import cStringIO
 from ..proto import framework_pb2
-from ..framework import OpProtoHolder, Variable
+from ..framework import OpProtoHolder, Variable, core, convert_np_dtype_to_dtype_
 from ..layer_helper import LayerHelper
 
 __all__ = [
@@ -178,6 +178,15 @@ def generate_layer_fn(op_type):
                         "operator {0} must input same dtype. {1} vs {2}".format(
                             op_type, dtype, each.dtype))
 
+        if dtype is None:
+            arg_dtype = kwargs.get("dtype")
+            if arg_dtype:
+                if not isinstance(arg_dtype, core.VarDesc.VarType):
+                    dtype = convert_np_dtype_to_dtype_(arg_dtype)
+                else:
+                    dtype = arg_dtype
+            else:
+                dtype = core.VarDesc.VarType.FP32
         return dtype
 
     def func(*args, **kwargs):

python/paddle/fluid/layers/tensor.py

@@ -622,7 +622,7 @@ def reverse(x, axis):
     out = helper.create_variable_for_type_inference(dtype=x.dtype)
     helper.append_op(
         type='reverse',
-        inputs={'Input': x},
+        inputs={'X': x},
         outputs={'Out': [out]},
         attrs={'axis': axis})
     return out