Fix bug in `assert_size_argument_jax_compatible`

pytensor/link/jax/dispatch/random.py

@@ -45,8 +45,10 @@ def assert_size_argument_jax_compatible(node):
 
     """
     size = node.inputs[1]
-    size_op = size.owner.op
-    if not isinstance(size_op, (Shape, Shape_i, JAXShapeTuple)):
+    size_node = size.owner
+    if (size_node is not None) and (
+        not isinstance(size_node.op, (Shape, Shape_i, JAXShapeTuple))
+    ):
         raise NotImplementedError(SIZE_NOT_COMPATIBLE)
 
 

tests/link/jax/test_random.py

@@ -693,6 +693,18 @@ def test_random_concrete_shape():
     assert jax_fn(np.ones((2, 3))).shape == (2, 3)
 
 
+def test_random_concrete_shape_from_param():
+    rng = shared(np.random.RandomState(123))
+    x_at = at.dmatrix()
+    out = at.random.normal(x_at, 1, rng=rng)
+    with pytest.warns(
+        UserWarning,
+        match="The RandomType SharedVariables \[.+\] will not be used"
+    ):
+        jax_fn = function([x_at], out, mode=jax_mode)
+    assert jax_fn(np.ones((2, 3))).shape == (2, 3)
+
+
 def test_random_concrete_shape_subtensor():
     """JAX should compile when a concrete value is passed for the `size` parameter.