class_docstr: Logistic Loss
  \log(1 + \exp(-l_i \cdot f(t_i)))
  l_i : label i from {-1, 1}
  f : score function
  t_i : triple i
code: def __call__(self, score, label):
      pass
  
label_desc: Use image node_id 2 for calling the BaseLogisticLoss obj's underlying member method code with example usage: obj.__call__(score, label) without return types