void hurting declarative performance

test=develop

python/paddle/fluid/framework.py

@@ -213,7 +213,7 @@ def _debug_string_(proto, throw_on_error=True):
     return proto.__str__()
 
 
-class Variable(core.VarBase):
+class Variable(object):
     """
     In Fluid, every input and output of an operator is a variable. In most
     cases, variables are used for holding different kinds of data or training
@@ -277,7 +277,6 @@ class Variable(core.VarBase):
                  stop_gradient=False,
                  is_data=False,
                  **kwargs):
-        core.VarBase.__init__(self)
         self.block = block
         self.error_clip = error_clip
 
@@ -357,6 +356,9 @@ class Variable(core.VarBase):
         self.op = None
         self.stop_gradient = stop_gradient
         self.is_data = is_data
+        if _in_imperative_mode():
+            self._ivar = core.VarBase()
+            self._ivar.desc = self.desc
 
     def _numpy(self):
         scope = _imperative_tracer().get_scope(self.block.desc)
@@ -365,10 +367,10 @@ class Variable(core.VarBase):
 
     def _backward(self):
         scope = _imperative_tracer().get_scope(self.block.desc)
-        self._run_backward(scope)
+        self._ivar._run_backward(scope)
 
     def _gradient(self):
-        return np.array(self._grad())
+        return np.array(self._ivar._grad())
 
     def __str__(self):
         return self.to_string(True)
@@ -516,7 +518,7 @@ class OpProtoHolder(object):
         }
 
 
-class Operator(core.OpBase):
+class Operator(object):
     """
     In Fluid, all the operation are represented by Operator, and Operator
     is regarded as a build in an instruction of a Block. Users can use the
@@ -572,7 +574,6 @@ class Operator(core.OpBase):
                  inputs=None,
                  outputs=None,
                  attrs=None):
-        core.OpBase.__init__(self)
         self.block = block
         self.desc = desc
         # note: not add self.attrs here:
@@ -612,7 +613,6 @@ class Operator(core.OpBase):
                     return True
             return False
 
-        self.inputs = []
         if inputs is not None:
             for in_proto in proto.inputs:
                 found = find_name(inputs, in_proto.name)
@@ -639,13 +639,6 @@ class Operator(core.OpBase):
                 else:
                     self.desc.set_input(in_proto.name, [])
 
-            for inp in inputs.values():
-                if isinstance(inp, Variable):
-                    self.inputs.append(inp)
-                elif isinstance(inp, list) or isinstance(inp, tuple):
-                    self.inputs.extend(inp[:])
-
-        self.outputs = []
         if outputs is not None:
             given = set()
             need = set()
@@ -674,12 +667,6 @@ class Operator(core.OpBase):
                     arg.op = self
                 self.desc.set_output(out_proto.name, out_arg_names)
 
-            for out in outputs.values():
-                if isinstance(out, Variable):
-                    self.outputs.append(out)
-                elif isinstance(out, list) or isinstance(out, tuple):
-                    self.outputs.extend(out[:])
-
         if op_attrs is not None:
             if not isinstance(op_attrs, dict):
                 raise TypeError("'attrs' should be a dict.")
@@ -694,6 +681,23 @@ class Operator(core.OpBase):
         if self._has_kernel(type):
             self.desc.infer_var_type(self.block.desc)
             self.desc.infer_shape(self.block.desc)
+        if _in_imperative_mode():
+            self.iop = core.OpBase()
+            self.iop.desc = self.desc
+            self.inputs = []
+            if inputs is not None:
+                for inp in inputs.values():
+                    if isinstance(inp, Variable):
+                        self.inputs.append(inp)
+                    elif isinstance(inp, list) or isinstance(inp, tuple):
+                        self.inputs.extend(inp[:])
+            self.outputs = []
+            if outputs is not None:
+                for out in outputs.values():
+                    if isinstance(out, Variable):
+                        self.outputs.append(out)
+                    elif isinstance(out, list) or isinstance(out, tuple):
+                        self.outputs.extend(out[:])
 
     def _has_kernel(self, op_type):
         return op_type not in self.OP_WITHOUT_KERNEL_SET
@@ -1246,7 +1250,8 @@ class Block(object):
         op_desc = self.desc.append_op()
         op = Operator(block=self, desc=op_desc, *args, **kwargs)
         if _in_imperative_mode():
-            _imperative_tracer().trace(op, op.inputs, op.outputs, self.desc)
+            _imperative_tracer().trace(op.iop, [v._ivar for v in op.inputs],
+                                       [v._ivar for v in op.outputs], self.desc)
         self.ops.append(op)
         return op