code: def _get_pos_loss(self, pos_score):
      return self.loss_criterion(pos_score, 1)
  
imports: from ..base_loss import *
  from .tensor_models import *
  import torch
  import torch.nn.functional
label_desc: Use image node_id 2 for calling the LossGenerator obj's underlying member method code with example usage: obj._get_pos_loss(pos_score) and returns: self