class_docstr: Code generator of fast monomial arithmetic functions. 
class_docstr_tok: ["Code","generator","of","fast","monomial","arithmetic","functions","."]
code: def __init__(self, ngens):
      self.ngens = ngens
  
imports: from itertools import combinations_with_replacement, product
  from textwrap import dedent
  from sympy.core import Mul, S, Tuple, sympify
  from sympy.polys.polyerrors import ExactQuotientFailed
  from sympy.polys.polyutils import PicklableWithSlots, dict_from_expr
  from sympy.utilities import public
  from sympy.utilities.iterables import is_sequence, iterable
label_desc: Use image node_id 1 to create a new MonomialOps object  with example: obj = MonomialOps(ngens)