code: def _prune_heads(self, heads_to_prune):
      raise NotImplementedError
  
imports: from ane_transformers.reference.layer_norm import LayerNormANE
  import torch
  import torch.nn
  from transformers.models.distilbert import modeling_distilbert
label_desc: Use image node_id 2 for calling the DistilBertModel obj's underlying member method code with example usage: obj._prune_heads(heads_to_prune) without return types