class_docstr: Field-aware Factorization Machine base class.
class_docstr_tok: ["Field-aware","Factorization","Machine","base","class","."]
code: def _interaction_coefficient(self, combination):
      j1, j2 = combination
      return np.dot(
          self.latents[j1][self._field(j2)],
          self.latents[j2][self._field(j1)],
      )
  
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 FFM obj's underlying member method code with example usage: obj._interaction_coefficient(combination) and returns: np