code: def dict_from_expr(expr, **args):
      """Transform an expression into a multinomial form."""
      rep, opt = _dict_from_expr(expr, build_options(args))
      return rep, opt.gens
  
imports: from __future__ import annotations
  from sympy.external.gmpy import GROUND_TYPES
  from sympy.core import S, Add, Mul, Pow, Eq, Expr, expand_mul, expand_multinomial
  from sympy.core.exprtools import decompose_power, decompose_power_rat
  from sympy.core.numbers import _illegal
  from sympy.polys.polyerrors import PolynomialError, GeneratorsError
  from sympy.polys.polyoptions import build_options
  import re
label_desc: Use image node_id 13 for calling a global function with example usage: dict_from_expr(expr) and returns: rep,  opt