class_docstr: A wrapper around an ensemble of models.
class_docstr_tok: ["A","wrapper","around","an","ensemble","of","models","."]
code: def initialize_output_tokens(self, encoder_outs, src_tokens):
      # LevT doesn't do length prediction.
      return self.models[0].initialize_output_tokens(
          encoder_outs[0], src_tokens
      )
  
imports: import math
  import torch
  import torch.nn.functional
  from fairseq.models.nat import _apply_del_words, _apply_ins_masks, _apply_ins_words, _fill, _skip, _skip_encoder_out
label_desc: Use image node_id 6 for calling the EnsembleLevT obj's underlying member method code with example usage: obj.initialize_output_tokens(encoder_outs, src_tokens) and returns: self