code: def output_types(self):
      return {
          "loss": NeuralType(elements_type=LossType()),
      }
  
imports: import torch
  import torch.nn.functional
  from nemo.collections.tts.modules.transformer import mask_from_lens
  from nemo.core.classes import Loss, typecheck
  from nemo.core.neural_types.elements import LengthsType, LossType, MelSpectrogramType, RegressionValuesType, TokenDurationType, TokenLogDurationType
  from nemo.core.neural_types.neural_type import NeuralType
label_desc: Use image node_id 2 for calling the MelLoss obj's underlying member method code with example usage: obj.output_types() and returns: dict