code: def forward(self, waveform: torch.Tensor) -> torch.Tensor:
      result, _ = self.encoder(waveform)
      return result[0]
  
imports: import argparse
  import logging
  import os
  from typing import Tuple
  import fairseq
  import torch
  import torchaudio
  from greedy_decoder import Decoder
  from torch.utils.mobile_optimizer import optimize_for_mobile
  from torchaudio.models.wav2vec2.utils.import_fairseq import import_fairseq_model
label_desc: Use image node_id 2 for calling the Encoder obj's underlying member method code with example usage: obj.forward(waveform) and returns: result