diff --git a/python/taichi/lang/matrix.py b/python/taichi/lang/matrix.py
index 51399376a408d..91fbc748fac95 100644
--- a/python/taichi/lang/matrix.py
+++ b/python/taichi/lang/matrix.py
@@ -24,18 +24,13 @@ class Matrix(TaichiOperations):
     """The matrix class.
 
     Args:
-        n (Union[int, list, tuple], np.ndarray): the first dimension of a matrix.
+        n (Union[int, list, tuple, np.ndarray]): the first dimension of a matrix.
         m (int): the second dimension of a matrix.
         dt (DataType): the element data type.
     """
     is_taichi_class = True
 
-    def __init__(self,
-                 n=1,
-                 m=1,
-                 dt=None,
-                 disable_local_tensor=False,
-                 suppress_warning=False):
+    def __init__(self, n=1, m=1, dt=None, suppress_warning=False):
         self.local_tensor_proxy = None
         self.any_array_access = None
         self.grad = None
@@ -49,8 +44,7 @@ def __init__(self,
             elif not isinstance(n[0], Iterable):  # now init a Vector
                 if in_python_scope():
                     mat = [[x] for x in n]
-                elif disable_local_tensor or not ti.current_cfg(
-                ).dynamic_index:
+                elif not ti.current_cfg().dynamic_index:
                     mat = [[impl.expr_init(x)] for x in n]
                 else:
                     if not ti.is_extension_supported(
@@ -88,8 +82,7 @@ def __init__(self,
             else:  # now init a Matrix
                 if in_python_scope():
                     mat = [list(row) for row in n]
-                elif disable_local_tensor or not ti.current_cfg(
-                ).dynamic_index:
+                elif not ti.current_cfg().dynamic_index:
                     mat = [[impl.expr_init(x) for x in row] for row in n]
                 else:
                     if not ti.is_extension_supported(
@@ -1012,20 +1005,6 @@ def cols(cols):
         """
         return Matrix.rows(cols).transpose()
 
-    @classmethod
-    def empty(cls, n, m):
-        """Clear the matrix and fill None.
-
-        Args:
-            n (int): The number of the row of the matrix.
-            m (int): The number of the column of the matrix.
-
-        Returns:
-            :class:`~taichi.lang.matrix.Matrix`: A :class:`~taichi.lang.matrix.Matrix` instance filled with None.
-
-        """
-        return cls([[None] * m for _ in range(n)], disable_local_tensor=True)
-
     def __hash__(self):
         # TODO: refactor KernelTemplateMapper
         # If not, we get `unhashable type: Matrix` when
diff --git a/python/taichi/lang/struct.py b/python/taichi/lang/struct.py
index 4b336db477d1c..d0d0ee9a4290f 100644
--- a/python/taichi/lang/struct.py
+++ b/python/taichi/lang/struct.py
@@ -214,18 +214,6 @@ def to_dict(self):
         """
         return self.entries
 
-    @classmethod
-    def empty(cls, entries):
-        """Clear the struct and fill None.
-
-        Args:
-            members (Dict[str, DataType]): the names and data types for struct members.
-        Returns:
-            :class:`~taichi.lang.struct.Struct`: A :class:`~taichi.lang.struct.Struct` instance filled with None.
-
-        """
-        return cls({k: None for k in entries})
-
     @classmethod
     @python_scope
     def field(cls,
diff --git a/tests/python/test_ast_refactor.py b/tests/python/test_ast_refactor.py
index 6d12cd61846b6..c3d8f54d07779 100644
--- a/tests/python/test_ast_refactor.py
+++ b/tests/python/test_ast_refactor.py
@@ -849,8 +849,7 @@ def test_listcomp():
     @ti.func
     def identity(dt, n: ti.template()):
         return ti.Matrix([[ti.cast(int(i == j), dt) for j in range(n)]
-                          for i in range(n)],
-                         disable_local_tensor=1)
+                          for i in range(n)])
 
     @ti.kernel
     def foo(n: ti.template()) -> ti.i32: