-model:connect(a, b, c)
-model:connect(b, nn.Linear(10, 15), nn.ReLU(), d)
-model:connect(d, e)
-model:connect(c, d)
-model:connect(c, nn.Mul(-1), e)
+dag:connect(a, b, c)
+dag:connect(b, nn.Linear(10, 15), nn.ReLU(), d)
+dag:connect(c, d)
+dag:connect(c, e)