code: def forward(self, x):
      l1 = self.linear1(x)
      l2 = self.linear2(x)
      l3 = self.linear3(l1)
      l4 = self.linear4(l2)
      l5 = self.linear5(l3)
      return l4, l5
  
file_path: colossalai/tests/test_fx/test_graph_manipulation.py
imports: import torch
  from colossalai.fx import ColoTracer
  from colossalai.fx.passes.utils import assign_bfs_level_to_nodes, get_leaf, get_top
  from colossalai.testing import clear_cache_before_run
label_desc: Use image node_id 2 for calling the MLP obj's underlying member method code with example usage: obj.forward(x) and returns: l4,  l5