code: def forward(self, input_ids=None, attention_mask=None):
      if attention_mask is not None:
          extended_attention_mask = self.bert_extended_attention_mask(
              attention_mask
          )
      else:
          extended_attention_mask = None
  
      if input_ids is not None:
          position_ids = self.bert_position_ids(input_ids)
      else:
          position_ids = None
      return position_ids, extended_attention_mask
  
file_path: colossalai/examples/tutorial/sequence_parallel/model/layers/preprocess.py
imports: import torch
  import torch.nn
  from colossalai.legacy.context.parallel_mode import ParallelMode
  from colossalai.legacy.core import global_context
label_desc: Use image node_id 4 for calling the PreProcessor obj's underlying member method code with example usage: obj.forward(input_ids, attention_mask) and returns: position_ids,  extended_attention_mask