code: def setup(app):
      app.add_directive("math_symbol_table", MathSymbolTableDirective)
  
      metadata = {
          "parallel_read_safe": True,
          "parallel_write_safe": True,
      }
      return metadata
  
file_path: matplotlib/doc/sphinxext/math_symbol_table.py
imports: import re
  from docutils.parsers.rst import Directive
  from matplotlib import _mathtext, _mathtext_data
label_desc: Use image node_id 2 for calling a global function with example usage: setup(app) and returns: metadata