move Tensor require_global_access to NameCtx

#252

nn/base.py

@@ -102,8 +102,6 @@ class Tensor:
     or via :func:`get_extern_data` for external data.
     """
 
-    require_global_access = False
-
     def __init__(
         self,
         *,
@@ -505,8 +503,6 @@ class Parameter(Tensor):
     wrapping to ``VariableLayer`` in RETURNN.
     """
 
-    require_global_access = True
-
     def __init__(
         self,
         shape: Sequence[Dim],
@@ -538,6 +534,7 @@ def __init__(
         # The name_ctx object will be completed by this information later.
         # See Tensor.get_name_in_ctx().
         name_ctx = nn.NameCtx(name="<unnamed-param>", parent=None)
+        name_ctx.require_global_access = True
         data = Data("parameter", dim_tags=list(shape), dtype=dtype)
         layer_dict = {"class": "variable", "shape": list(shape), "param_name": "param"}
         if dtype is not None:

nn/naming.py

@@ -200,6 +200,7 @@ def __init__(
         self._subnet_main_output = None  # type: Optional[nn.Tensor]  # when this is via SubnetworkLayer
         self.virtual = virtual  # does not consume a layer name in RETURNN. see get_name_in_ctx
         self.can_access_children = can_access_children  # from outside
+        self.require_global_access = False  # from outside
         self.new_control_flow_ctx = new_control_flow_ctx
         self.children = {}  # type: Dict[str, NameCtx]
         self.extern_data = {}  # type: Dict[str, nn.Data]  # only for the root name ctx
@@ -441,7 +442,7 @@ def _auto_assign_parent(self, *, root: nn.NameCtx):
             if parent_module_calls:
                 parent_name_ctx = parent_module_calls[0]
                 sub_name = attr
-                if self.tensor.require_global_access and not parent_name_ctx.can_access_children_from_root:
+                if self.require_global_access and not parent_name_ctx.can_access_children_from_root:
                     sub_name = parent_name_ctx.name + "_" + sub_name
                     while not parent_name_ctx.can_access_children_from_root:
                         parent_name_ctx = parent_name_ctx.parent