Compile now can attach arbitrary data to an entry (#2634)

python/tests/test_compile.py

@@ -1064,6 +1064,57 @@ class TestCompile(mlx_tests.MLXTestCase):
         out = fun(mx.array(1.0), mx.array(2.0))
         self.assertEqual(out.item(), 3.0)
 
+    def test_compile_changing_outputs(self):
+        @mx.compile
+        def fun(x, y):
+            if y is None:
+                return 2 * x
+            elif (
+                isinstance(x, mx.array)
+                and isinstance(y, mx.array)
+                and x.dtype == y.dtype == mx.float32
+            ):
+                return [x + y]
+            elif y.dtype == mx.bool_:
+                return {"a": x, "b": y * x}
+            else:
+                return None
+
+        a = fun(mx.array(1.0), mx.array(2.0))
+        self.assertTrue(isinstance(a, list))
+        self.assertEqual(a[0].item(), 3.0)
+
+        b = fun(mx.array(1.0), mx.array(True))
+        self.assertTrue(isinstance(b, dict))
+        self.assertEqual(b["a"].item(), 1.0)
+        self.assertEqual(b["b"].item(), 1.0)
+
+        c = fun(mx.array(1.0), None)
+        self.assertTrue(isinstance(c, mx.array))
+        self.assertEqual(c.item(), 2.0)
+
+        d = fun(False, mx.array(1.0))
+        self.assertTrue(d is None)
+
+    def test_compile_changing_outputs_with_state(self):
+        state = [mx.array(1.0)]
+
+        @partial(mx.compile, inputs=state, outputs=state)
+        def fun(y):
+            x = state[0]
+            if y.dtype == mx.float32:
+                state[0] = 2 * y
+                return [x, y, x + y]
+            elif y.dtype == mx.int32:
+                state[0] *= 2
+                return x + y
+
+        for i in range(10):
+            fun(mx.array(1.0))
+            fun(mx.array(1))
+
+        self.assertEqual(state[0].item(), 4)
+
 
 if __name__ == "__main__":
     mlx_tests.MLXTestRunner()