class_docstr: Factorization machine base class.
class_docstr_tok: ["Factorization","machine","base","class","."]
code: def _interaction_coefficient(self, combination):
      j1, j2 = combination
      return np.dot(self.latents[j1], self.latents[j2])
  
imports: from __future__ import annotations
  import collections
  import functools
  import itertools
  import numpy
  from river import base, optim, utils
  from .base import BaseFM
label_desc: Use image node_id 6 for calling the FM obj's underlying member method code with example usage: obj._interaction_coefficient(combination) and returns: np