Update `apply_policy()` in `theano/gof/cc`.

This function expects policy to be lists (or tuples) of functions, but individual functions are sometimes passed directly.

Update `apply_policy()` in `theano/gof/cc`.
4449d5e8 · notoraptor · 780536f2 · 4449d5e8
--- a/theano/gof/cc.py
+++ b/theano/gof/cc.py
@@ -476,7 +476,8 @@ def apply_policy(policy, r, name, sub):
        C{policy[0](r) + policy[1](r) + ...}.
    """
-    if isinstance(policy, (list, tuple)):
+    if not isinstance(policy, (list, tuple)):
+        policy = [policy]
    ret = ""
    for sub_policy in policy:
        ret += sub_policy(r, name, sub)