code: def compression_channels(self) -> int:
      return self._compression_channels
  
imports: from typing import List, Optional
  import torch
  import torch.nn
  from compressai.layers import GDN, AttentionBlock
  from neural.layers_utils import make_conv, make_deconv
  from torch import Tensor
label_desc: Use image node_id 2 for calling the ConvGDNAnalysis obj's underlying member method code with example usage: obj.compression_channels() and returns: self