code: def ckpt3(self, x, y):
      return self.linear2(x) + self.linear2(y)
  
imports: import pytest
  import torch
  import torch.nn.functional
  from torch.utils.checkpoint import checkpoint
  import colossalai
  from colossalai.fx import ColoTracer
  from colossalai.fx.graph_module import ColoGraphModule
  from colossalai.legacy.core import global_context
  from colossalai.testing import rerun_if_address_is_in_use, spawn
label_desc: Use image node_id 3 for calling the MyModule obj's underlying member method code with example usage: obj.ckpt3(x, y) and returns: unknown