Support for get_constant to return ndarrays not only scalars.

theano/tensor/basic.py

@@ -409,9 +409,12 @@ def _allclose(a, b):
 
     return numpy.allclose(a,b, atol=atol, rtol=rtol)
 
-def get_constant_value(v):
+def get_constant_value(v, return_ndarray = False):
     """return the constant scalar(0-D) value underlying variable `v`
 
+    If ``return_ndarray`` is True, it also returns numpy ndarrays if this is
+    the content of the constant.
+
     If v is the output of dimshuffles, fills, allocs, rebroadcasts, cast
     this function digs through them.
 
@@ -426,10 +429,12 @@ def get_constant_value(v):
         # it is not a constant, but in some cases it *could* be replaced with one.
         # Note that this would have an effect on the broadcasting of inputs and so on
         try:
+            if return_ndarray and isinstance(v.data, numpy.ndarray):
+                return v.data
             numpy.complex(v.data) #works for all numeric scalars
             return v.data
         except:
-            raise TypeError('v.data is non-numeric', v)
+            raise TypeError('v.data is non-numeric or non-scalar', v)
     if v.owner:
         if isinstance(v.owner.op, Alloc):
             return get_constant_value(v.owner.inputs[0])