Update ml-agents/mlagents/trainers/tests/torch/saver/test_saver_reward_providers.py

ml-agents/mlagents/trainers/tests/torch/saver/test_saver_reward_providers.py

     saver2 = TorchSaver(trainer_settings, path1, load=True)
     saver2.register(policy2)
     saver2.register(optimizer2)
-    saver2.initialize_or_load(policy2)
     saver2.initialize_or_load()  # This is to load the optimizers
 
     # assert the models have the same weights