Fix crash in Lop

Fix Lop to comply with new requirement that theano.grad's known_grad argument be an OrderedDict.

Fix crash in Lop
1838beb3 · Yann N. Dauphin · GitHub · aecbbb99 · 1838beb3
--- a/theano/gradient.py
+++ b/theano/gradient.py
@@ -345,7 +345,7 @@ def Lop(f, wrt, eval_points, consider_constant=None,
        wrt = [wrt]
    assert len(f) == len(grads)
-    known = dict(izip(f, grads))
+    known = OrderedDict(izip(f, grads))
    ret = grad(cost=None, known_grads=known,
               consider_constant=consider_constant, wrt=wrt,