code: def export_context() -> infra.DiagnosticContext:
      global _context
      return _context
  
imports: from __future__ import annotations
  import contextlib
  import gzip
  from collections.abc import Generator
  from typing import List, Optional
  import torch
  from torch.onnx._internal.diagnostics import infra
  from torch.onnx._internal.diagnostics.infra import formatter, sarif
  from torch.onnx._internal.diagnostics.infra.sarif import version
  from torch.utils import cpp_backtrace
label_desc: Use image node_id 4 for calling a global function with example usage: export_context() and returns: _context