code: def original_layer_class():
      return MBartDecoderLayer
  
imports: from transformers.models.mbart.modeling_mbart import MBartDecoderLayer, MBartEncoderLayer
  from parallelformers.policies.base import Layer, Policy
  from parallelformers.transformers.modeling_bart import BartAttention_
  from parallelformers.utils.dist_utils import AllReduceLinear
label_desc: Use image node_id 7 for calling the MBartDecoderPolicy obj's underlying member method code with example usage: obj.original_layer_class() and returns: MBartDecoderLayer