Test data padding does not match world_size?

[chujiezheng]

I encountered a problem that the padded test data here

verl/verl/trainer/ppo/ray_trainer.py

Lines 418 to 419 in 9fca71d

	test_gen_batch_padded, pad_size = pad_dataproto_to_divisor(test_gen_batch, self.actor_rollout_wg.world_size)
	test_output_gen_batch_padded = self.actor_rollout_wg.generate_sequences(test_gen_batch_padded)

cannot be dispatched properly (AssertionError: only support equal chunk.)

verl/verl/single_controller/base/decorator.py

Lines 275 to 276 in 9fca71d

	splitted_args, splitted_kwargs = _split_args_kwargs_data_proto(worker_group.world_size, *args, **kwargs)
	return splitted_args, splitted_kwargs

So I wonder whether the divisor self.actor_rollout_wg.world_size is the same as the chunk number worker_group.world_size?

[vermouth1992]

Fix in #150