code: def test_plus(self):
      self.start_tests(name="plus")
  
      optimizer = dict(
          type="plus",
          optimizer1=dict(type="adam", learning_rate=1e-3),
          optimizer2=dict(type="adagrad", learning_rate=1e-3),
      )
      self.unittest(optimizer=optimizer)
  
file_path: tensorforce/test/test_optimizers.py
imports: import unittest
  from test.unittest_base import UnittestBase
label_desc: Use image node_id 4 for calling the TestOptimizers obj's underlying member method code with example usage: obj.test_plus() without return types