class_docstr: Logsigmoid Loss
  -\log(rac{1}{1 + \exp(-l_i \cdot f(t_i))})
  l_i : label i from {-1, 1}
  f : score
  t_i : triple i
code: def __init__(self):
      super(BaseLogsigmoidLoss, self).__init__()
  
label_desc: Use image node_id 1 to create a new BaseLogsigmoidLoss object from inherited base classes: BaseLoss with example: obj = BaseLogsigmoidLoss()