Allow BNComposite to be inplace

theano/scalar/basic.py

@@ -3329,6 +3329,8 @@ class Composite(ScalarOp):
     Composite depends on all the Ops in its graph having C code.
 
     """
+    __props__ = ('inputs', 'outputs')
+
     def __str__(self):
         return self.name
 
@@ -3339,7 +3341,8 @@ class Composite(ScalarOp):
         This fct allow fix patch this.
 
         """
-        out = self.__class__(self.inputs, self.outputs)
+        d = dict([(k, getattr(self, k)) for k in self.__props__])
+        out = self.__class__(**d)
         if name:
             out.name = name
         else:

theano/tensor/nnet/bn.py

@@ -4,8 +4,10 @@ from theano.scalar import add, sub, true_div, mul
 
 
 class BNComposite(Composite):
+    __props__ = ('dtype',)
 
     def __init__(self, dtype):
+        self.dtype = dtype
         x = theano.scalar.Scalar(dtype=dtype).make_variable()
         mean = theano.scalar.Scalar(dtype=dtype).make_variable()
         std = theano.scalar.Scalar(dtype=dtype).make_variable()