code: def get_config(cls):
      return RetroConfig(
          num_layers=12,
          hidden_size=16,
          num_attention_heads=4,
          use_cpu_initialization=True,
          retro_num_neighbors=2,
          retro_preprocess=types.SimpleNamespace(
              retro_gpt_chunk_length=4,
              retro_gpt_retrieved_length=8,
          ),
      )
  
file_path: megatron-lm/tests/unit_tests/transformer/test_retro_attention.py
imports: import torch
  import types
  from megatron.core.models.retro import RetroConfig, get_retro_decoder_block_spec
  from megatron.core.models.retro.decoder_attention import RetroDecoderCrossAttention, RetroDecoderBiasDropoutAdd
  from megatron.core.models.retro.encoder_attention import RetroEncoderCrossAttention, RetroEncoderBiasDropoutAdd, RetroEncoderLayerNorm
  from megatron.core.tensor_parallel.random import model_parallel_cuda_manual_seed
  from megatron.core.transformer.transformer_block import TransformerBlock
  from tests.unit_tests.test_utilities import Utils
label_desc: Use image node_id 1 for calling the TestRetroAttention obj's underlying member method code with example usage: obj.get_config(cls) and returns: RetroConfig