code: def register_loss(name, bypass_checks=False):
      """Registers a ClassyLoss subclass.
  
      This decorator allows Classy Vision to instantiate a subclass of
      ClassyLoss from a configuration file, even if the class itself is not
      part of the Classy Vision framework. To use it, apply this decorator to a
      ClassyLoss subclass, like this:
  
      .. code-block:: python
  
       @register_loss("my_loss")
       class MyLoss(ClassyLoss):
            ...
  
      To instantiate a loss from a configuration file, see
      :func:`build_loss`."""
  
      def register_loss_cls(cls):
          if not bypass_checks:
              if name in LOSS_REGISTRY:
                  msg = "Cannot register duplicate loss ({}). Already registered at \n{}\n"
                  raise ValueError(
                      msg.format(name, LOSS_REGISTRY_TB[name])
                  )
              if not issubclass(cls, ClassyLoss):
                  raise ValueError(
                      "Loss ({}: {}) must extend ClassyLoss".format(
                          name, cls.__name__
                      )
                  )
          tb = "".join(traceback.format_stack())
          LOSS_REGISTRY[name] = cls
          LOSS_CLASS_NAMES.add(cls.__name__)
          LOSS_REGISTRY_TB[name] = tb
          LOSS_CLASS_NAMES_TB[cls.__name__] = tb
          return cls
  
      return register_loss_cls
  
file_path: ClassyVision/classy_vision/losses/__init__.py
imports: import copy
  import traceback
  from pathlib import Path
  import torch
  import torch.nn.modules.loss
  from classy_vision.generic.registry_utils import import_all_modules
  from classy_vision.generic.util import log_class_usage
  from .classy_loss import ClassyLoss
  from .barron_loss import BarronLoss
  from .label_smoothing_loss import LabelSmoothingCrossEntropyLoss
  from .multi_output_sum_loss import MultiOutputSumLoss
  from .soft_target_cross_entropy_loss import SoftTargetCrossEntropyLoss
  from .sum_arbitrary_loss import SumArbitraryLoss
label_desc: Use image node_id 2 for calling a global function with example usage: register_loss(name, bypass_checks) and returns: register_loss_cls, cls