Remove assert in a test that isn't well taught. It give random tests failure.

theano/tensor/tests/test_gc.py

@@ -53,10 +53,10 @@ def test_gc_never_pickles_temporaries():
         len_pre_f = len(cPickle.dumps(f))
         len_pre_g = len(cPickle.dumps(g))
 
-        # should be no difference at first
-        # In future, FunctionMaker might pickle linker-dependent stuff and make
-        # this assertion fail.
-        assert len_pre_f == len_pre_g
+        # We can't compare the content or the length of the string
+        # between f and g. 2 reason, we store some timming information
+        # in float. They won't be the same each time. Different float
+        # can have different lenght when printed.
 
         def a(fn):
             return len(cPickle.dumps(fn.maker))