code: def set_default_context(ctx):
      """
      Set the default context.
  
      Note:
          It cannot be called inside any `context_scope`.
  
      Args:
          ctx (Context): A Context.
  
      """
      global context_level
      global current_ctx
      assert (
          context_level == 0
      ), "It cannot be called inside any context_scope."
      current_ctx = ctx
  
imports: from __future__ import absolute_import
  from contextlib import contextmanager
  from .variable import Context
label_desc: Use image node_id 2 for calling a global function with example usage: set_default_context(ctx) without return types