Deprecate grad_overrides in OpFromGraph

pytensor/compile/builders.py

 """Define new Ops from existing Ops"""
 
+import warnings
 from collections import OrderedDict
 from collections.abc import Sequence
 from copy import copy
@@ -189,7 +190,7 @@ class OpFromGraph(Op, HasInnerGraph):
     - For overriding, it's recommended to provide pure functions (no side
       effects like setting global variable) as callable(s). The callable(s)
       supplied for overriding gradient/rop will be called only once at the
-      first call to grad/R_op, and will be converted to OpFromGraph instances.
+      first call to L_op/R_op, and will be converted to OpFromGraph instances.
 
     Examples
     --------
@@ -224,7 +225,7 @@ class OpFromGraph(Op, HasInnerGraph):
         e2 = op(x, y, z) + op(z, y, x)
         fn = function([x, y, z], [e2])
 
-    Example 3 override gradient
+    Example 3 override L_op
 
     .. code-block:: python
 
@@ -233,12 +234,15 @@ class OpFromGraph(Op, HasInnerGraph):
 
         x, y, z = pt.scalars('xyz')
         e = x + y * z
-        def rescale_dy(inps, grads):
+        def rescale_dy(inps, outputs, out_grads):
             x, y, z = inps
-            g, = grads
+            g, = out_grads
             return z*2
         op = OpFromGraph(
-            [x, y, z], [e], grad_overrides=['default', rescale_dy, 'default']
+            [x, y, z],
+            [e],
+            lop_overrides=['default', rescale_dy, 'default'],
+        )
         e2 = op(x, y, z)
         dx, dy, dz = grad(e2, [x, y, z])
         fn = function([x, y, z], [dx, dy, dz])
@@ -455,6 +459,10 @@ class OpFromGraph(Op, HasInnerGraph):
                 self.set_lop_overrides(lop_overrides)
                 self._lop_type = "lop"
         elif grad_overrides != "default":
+            warnings.warn(
+                "grad_overrides is deprecated in favor of lop_overrides. Using it will lead to an error in the future.",
+                FutureWarning,
+            )
             self.set_lop_overrides(grad_overrides)
             self._lop_type = "grad"
         else:

tests/compile/test_builders.py

@@ -181,8 +181,9 @@ class TestOpFromGraph(unittest_tools.InferShapeTester):
         dedz = vector("dedz")
         op_mul_grad = cls_ofg([x, y, dedz], go([x, y], [dedz]))
 
-        op_mul = cls_ofg([x, y], [x * y], grad_overrides=go)
-        op_mul2 = cls_ofg([x, y], [x * y], grad_overrides=op_mul_grad)
+        with pytest.warns(FutureWarning, match="grad_overrides is deprecated"):
+            op_mul = cls_ofg([x, y], [x * y], grad_overrides=go)
+            op_mul2 = cls_ofg([x, y], [x * y], grad_overrides=op_mul_grad)
 
         # single override case (function or OfG instance)
         xx, yy = vector("xx"), vector("yy")
@@ -209,9 +210,10 @@ class TestOpFromGraph(unittest_tools.InferShapeTester):
 
         w, b = vectors("wb")
         # we make the 3rd gradient default (no override)
-        op_linear = cls_ofg(
-            [x, w, b], [x * w + b], grad_overrides=[go1, go2, "default"]
-        )
+        with pytest.warns(FutureWarning, match="grad_overrides is deprecated"):
+            op_linear = cls_ofg(
+                [x, w, b], [x * w + b], grad_overrides=[go1, go2, "default"]
+            )
         xx, ww, bb = vector("xx"), vector("yy"), vector("bb")
         zz = pt_sum(op_linear(xx, ww, bb))
         dx, dw, db = grad(zz, [xx, ww, bb])
@@ -225,11 +227,12 @@ class TestOpFromGraph(unittest_tools.InferShapeTester):
         np.testing.assert_array_almost_equal(np.ones(16, dtype=config.floatX), dbv, 4)
 
         # NullType and DisconnectedType
-        op_linear2 = cls_ofg(
-            [x, w, b],
-            [x * w + b],
-            grad_overrides=[go1, NullType()(), DisconnectedType()()],
-        )
+        with pytest.warns(FutureWarning, match="grad_overrides is deprecated"):
+            op_linear2 = cls_ofg(
+                [x, w, b],
+                [x * w + b],
+                grad_overrides=[go1, NullType()(), DisconnectedType()()],
+            )
         zz2 = pt_sum(op_linear2(xx, ww, bb))
         dx2, dw2, db2 = grad(
             zz2,
@@ -339,13 +342,14 @@ class TestOpFromGraph(unittest_tools.InferShapeTester):
         def f1_back(inputs, output_gradients):
             return [output_gradients[0], disconnected_type()]
 
-        op = cls_ofg(
-            inputs=[x, y],
-            outputs=[f1(x, y)],
-            grad_overrides=f1_back,
-            connection_pattern=[[True], [False]],  # This is new
-            on_unused_input="ignore",
-        )  # This is new
+        with pytest.warns(FutureWarning, match="grad_overrides is deprecated"):
+            op = cls_ofg(
+                inputs=[x, y],
+                outputs=[f1(x, y)],
+                grad_overrides=f1_back,
+                connection_pattern=[[True], [False]],
+                on_unused_input="ignore",
+            )
 
         c = op(x, y)