code: def gpt2_attention_mask_func(self, attention_scores, ltor_mask):
      attention_scores.masked_fill_(ltor_mask, -10000.0)
      return attention_scores
  
file_path: H2O/h2o_flexgen/benchmark/third_party/DeepSpeed/tests/unit/megatron_model.py
imports: import torch
  import os
  import sys
  import math
  from .common import get_test_path
  from deepspeed.pipe import PipelineModule, LayerSpec
label_desc: Use image node_id 2 for calling the MockGPT2ModelPipe obj's underlying member method code with example usage: obj.gpt2_attention_mask_func(attention_scores, ltor_mask) and returns: attention_scores