Delete not_none (facebook#3003)

Summary:
Pull Request resolved: facebook#3003

As titled

Reviewed By: saitcakmak, Balandat, paschai

Differential Revision: D65278088

ax/utils/common/tests/test_typeutils.py

@@ -14,17 +14,11 @@
     checked_cast_dict,
     checked_cast_list,
     checked_cast_optional,
-    not_none,
 )
 from ax.utils.common.typeutils_nonnative import numpy_type_to_python_type
 
 
 class TestTypeUtils(TestCase):
-    def test_not_none(self) -> None:
-        self.assertEqual(not_none("not_none"), "not_none")
-        with self.assertRaises(ValueError):
-            not_none(None)
-
     def test_checked_cast(self) -> None:
         self.assertEqual(checked_cast(float, 2.0), 2.0)
         with self.assertRaises(ValueError):

ax/utils/common/typeutils.py

@@ -15,23 +15,6 @@
 Y = TypeVar("Y")
 
 
-def not_none(val: T | None, message: str | None = None) -> T:
-    """
-    Unbox an optional type.
-
-    Args:
-      val: the value to cast to a non ``None`` type
-      message: optional override of the default error message
-    Returns:
-      V:  ``val`` when ``val`` is not ``None``
-    Throws:
-      ValueError if ``val`` is ``None``
-    """
-    if val is None:
-        raise ValueError(message or "Argument to `not_none` was None.")
-    return val
-
-
 def checked_cast(typ: type[T], val: V, exception: Exception | None = None) -> T:
     """
     Cast a value to a type (with a runtime safety check).