code: def forward(self, x, y):
      return x + y
  
file_path: PARL/parl/core/tests/model_base_test.py
imports: import unittest
  from parl.core.model_base import ModelBase
label_desc: Use image node_id 1 for calling the TestBaseModel obj's underlying member method code with example usage: obj.forward(x, y) and returns: unknown