Remove the old sparse_grad interface.

theano/sparse/tests/test_basic.py

@@ -450,22 +450,6 @@ class TestConstructSparseFromList(unittest.TestCase):
         g = theano.grad(sub.sum(), m)
         assert isinstance(g.owner.op, tensor.AdvancedIncSubtensor1)
 
-        # Test that we create a sparse grad when asked
-        # OLD INTERFACE
-        m = theano.tensor.matrix()
-        sub = m[v]
-        m.type.sparse_grad = True
-        g = theano.grad(sub.sum(), m)
-        assert isinstance(g.owner.op, ConstructSparseFromList)
-
-        # Test that we create a sparse grad when asked
-        # OLD INTERFACE CONSEQUENCE
-        m = theano.tensor.matrix()
-        sub = m[v]
-        sub.type.sparse_grad = True
-        g = theano.grad(sub.sum(), m)
-        assert isinstance(g.owner.op, ConstructSparseFromList)
-
         # Test that we create a sparse grad when asked
         # USER INTERFACE
         m = theano.tensor.matrix()

theano/tensor/subtensor.py

@@ -1567,14 +1567,7 @@ class AdvancedSubtensor1(Op):
         x, ilist = inputs
         gz, = grads
         assert len(inputs) == 2
-        sparse = False
-        if getattr(x.type, 'sparse_grad', False):
-            sparse = True
-            warnings.warn(
-                "DEPRECATION WARNING: AdvancedSubtensor1, you are using"
-                " an old interface to the sparse grad. You should use"
-                " theano.sparse_grad(a_tensor[an_int_vector]). ")
-        if sparse or self.sparse_grad:
+        if self.sparse_grad:
             if x.type.ndim != 2:
                 raise TypeError(
                     "AdvancedSubtensor1: you can't take the sparse grad"