class_docstr: Base class to calculate the loss during training.
  
  This implementation of :class:`torch.nn.Module` allows building
  the loss object from a configuration file.
docstr: Compute the loss for the provided sample.
  
  Refer to :class:`torch.nn.Module` for more details.
code: def forward(self, output, target):
      """
      Compute the loss for the provided sample.
  
      Refer to :class:`torch.nn.Module` for more details.
      """
      raise NotImplementedError
  
file_path: ClassyVision/classy_vision/losses/classy_loss.py
imports: from typing import Any, Dict
  import torch.nn
label_desc: Use image node_id 3 for calling the ClassyLoss obj's underlying member method code with example usage: obj.forward(output, target) without return types