Change behavior of helper set/inc to act on an indexed variable directly

pytensor/tensor/variable.py

@@ -824,25 +824,35 @@ class _tensor_py_operators:
         """Return selected slices only."""
         return pt.extra_ops.compress(self, a, axis=axis)
 
-    def set(self, idx, y, **kwargs):
-        """Return a copy of self with the indexed values set to y.
+    def set(self, y, **kwargs):
+        """Return a copy of the variable indexed by self with the indexed values set to y.
 
-        Equivalent to set_subtensor(self[idx], y). See docstrings for kwargs.
+        Equivalent to set_subtensor(self, y). See docstrings for kwargs.
+
+        Raises
+        ------
+        TypeError:
+            If self is not the result of a subtensor operation
 
         Examples
         --------
         >>> import pytensor.tensor as pt
         >>>
         >>> x = pt.ones((3,))
-        >>> out = x.set(1, 2)
+        >>> out = x[1].set(2)
         >>> out.eval()  # array([1., 2., 1.])
         """
-        return pt.subtensor.set_subtensor(self[idx], y, **kwargs)
+        return pt.subtensor.set_subtensor(self, y, **kwargs)
+
+    def inc(self, y, **kwargs):
+        """Return a copy of the variable indexed by self with the indexed values incremented by y.
 
-    def inc(self, idx, y, **kwargs):
-        """Return a copy of self with the indexed values incremented by y.
+        Equivalent to inc_subtensor(self, y). See docstrings for kwargs.
 
-        Equivalent to inc_subtensor(self[idx], y). See docstrings for kwargs.
+        Raises
+        ------
+        TypeError:
+            If self is not the result of a subtensor operation
 
         Examples
         --------
@@ -850,10 +860,10 @@ class _tensor_py_operators:
         >>> import pytensor.tensor as pt
         >>>
         >>> x = pt.ones((3,))
-        >>> out = x.inc(1, 2)
+        >>> out = x[1].inc(2)
         >>> out.eval()  # array([1., 3., 1.])
         """
-        return pt.inc_subtensor(self[idx], y, **kwargs)
+        return pt.inc_subtensor(self, y, **kwargs)
 
 
 class TensorVariable(

tests/tensor/test_variable.py

@@ -438,8 +438,8 @@ class TestTensorInstanceMethods:
         idx = [0]
         y = 5
 
-        assert equal_computations([x.set(idx, y)], [set_subtensor(x[idx], y)])
-        assert equal_computations([x.inc(idx, y)], [inc_subtensor(x[idx], y)])
+        assert equal_computations([x[:, idx].set(y)], [set_subtensor(x[:, idx], y)])
+        assert equal_computations([x[:, idx].inc(y)], [inc_subtensor(x[:, idx], y)])
 
     def test_set_item_error(self):
         x = matrix("x")