Test the complete fix gh-689

theano/tensor/tests/test_opt.py

@@ -1207,6 +1207,36 @@ class test_fusion(unittest.TestCase):
         # Test it on some dummy values
         f(*[range(i, 4 + i) for i in range(35)])
 
+    def test_pickle_big_fusion(self):
+        """In the past, pickle of Composite generated in tha case
+        crashed with max recusion limit. So we where not able to
+        generate C code in that case.
+
+        """
+        factors = []
+        sd = tensor.dscalar()
+        means = tensor.dvector()
+
+        cst_05 = theano.tensor.constant(.5)
+        cst_m05 = theano.tensor.constant(2)
+        cst_2 = theano.tensor.constant(2)
+        cst_m2 = theano.tensor.constant(-2)
+        ones = theano.tensor.constant(numpy.ones(10))
+        n = 85
+        if theano.config.mode in ["DebugMode", "DEBUG_MODE"]:
+            n = 10
+
+        for i in range(n):
+            f = (cst_m05 * sd ** cst_m2 * (ones - means[i]) ** cst_2 +
+                 cst_05 * tensor.log(cst_05 * (sd ** cst_m2) / numpy.pi))
+            factors.append(tensor.sum(f))
+
+        logp = tensor.add(*factors)
+
+        vars = [sd, means]
+        dlogp = function(vars, [theano.grad(logp, v) for v in vars])
+        dlogp(2, numpy.random.rand(n))
+
     def speed_fusion(self, shared_fn=shared, gpu=False, s=None):
         """
         param type s: a slice object