code: def test_cpu_forward(self):
      # we can't currently do this because the global memory buffer is on GPU
      pass
  
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 6 for calling the TestRetroAttention obj's underlying member method code with example usage: obj.test_cpu_forward() without return types