class_docstr: Abstract implementation of score function.
      
class_docstr_tok: ["Abstract","implementation","of","score","function","."]
code: def __call__(self, head, rel, tail):
      raise NotImplementedError("foward of ScoreFunc not implemented!")
  
imports: import math
  import numpy
  from numpy.random import RandomState
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle.nn.functional import log_sigmoid
label_desc: Use image node_id 2 for calling the ScoreFunc obj's underlying member method code with example usage: obj.__call__(head, rel, tail) without return types