docstr: Setup common members
          
docstr_tok: ["Setup","common","members"]
code: def setup_class(self):
      """Setup common members"""
      self.batch_size = 2
      self.max_len = 20
      self.codebook_size = 256
      self.codebook_dim = 64
      self.num_examples = 10
  
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 TestResidualVectorQuantizer obj's underlying member method code with example usage: obj.setup_class() without return types