code: def setup_class(self):
      self.batch_size = 2
      self.in_channels = 4
      self.max_len = 4
  
imports: import pytest
  import torch
  from nemo.collections.tts.modules.audio_codec_modules import CodecActivation, Conv1dNorm, ConvTranspose1dNorm, FiniteScalarQuantizer, GroupFiniteScalarQuantizer, get_down_sample_padding
  from nemo.collections.tts.modules.encodec_modules import GroupResidualVectorQuantizer, ResidualVectorQuantizer
label_desc: Use image node_id 1 for calling the TestCodecActivation obj's underlying member method code with example usage: obj.setup_class() without return types