Sum the timming

d3026c6f · Frederic Bastien · 34bec6f3 · d3026c6f
--- a/theano/gradient.py
+++ b/theano/gradient.py
@@ -560,7 +560,7 @@ def grad(cost, wrt, consider_constant=None,
        rval, = rval
    t1 = time.time()
    global grad_time
-    grad_time = t1 - t0
+    grad_time += t1 - t0
    return rval