IndexError when run the flow/envs/ring/lane_change_accel

[17150934]

when I run the flow/envs/ring/lane_change_accel,there is an error:

Traceback (most recent call last): File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/tune/trial_runner.py", line 426, in _process_trial result = self.trial_executor.fetch_result(trial) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/tune/ray_trial_executor.py", line 378, in fetch_result result = ray.get(trial_future[0], DEFAULT_GET_TIMEOUT) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/worker.py", line 1457, in get raise value.as_instanceof_cause() ray.exceptions.RayTaskError(IndexError): ray::PPO.train() (pid=5690, ip=192.168.6.112) File "python/ray/_raylet.pyx", line 636, in ray._raylet.execute_task File "python/ray/_raylet.pyx", line 619, in ray._raylet.execute_task.function_executor File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/agents/trainer.py", line 444, in train raise e File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/agents/trainer.py", line 433, in train result = Trainable.train(self) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/tune/trainable.py", line 176, in train result = self._train() File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/agents/trainer_template.py", line 129, in _train fetches = self.optimizer.step() File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/optimizers/multi_gpu_optimizer.py", line 140, in step self.num_envs_per_worker, self.train_batch_size) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/optimizers/rollout.py", line 29, in collect_samples next_sample = ray_get_and_free(fut_sample) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/utils/memory.py", line 33, in ray_get_and_free result = ray.get(object_ids) ray.exceptions.RayTaskError(IndexError): ray::RolloutWorker.sample() (pid=5766, ip=192.168.6.112) File "python/ray/_raylet.pyx", line 636, in ray._raylet.execute_task File "python/ray/_raylet.pyx", line 619, in ray._raylet.execute_task.function_executor File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/evaluation/rollout_worker.py", line 471, in sample batches = [self.input_reader.next()] File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/evaluation/sampler.py", line 56, in next batches = [self.get_data()] File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/evaluation/sampler.py", line 99, in get_data item = next(self.rollout_provider) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/evaluation/sampler.py", line 340, in _env_runner base_env.send_actions(actions_to_send) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/env/base_env.py", line 332, in send_actions self.vector_env.vector_step(action_vector) File "/home/vcdc/anaconda3/envs/flow/lib/python3.7/site-packages/ray/rllib/env/vector_env.py", line 110, in vector_step obs, r, done, info = self.envs[i].step(actions[i]) File "/home/vcdc/flow/flow/envs/base.py", line 364, in step self.apply_rl_actions(rl_actions) File "/home/vcdc/flow/flow/envs/base.py", line 616, in apply_rl_actions self._apply_rl_actions(rl_clipped) File "/home/vcdc/flow/flow/envs/ring/lane_change_accel.py", line 151, in _apply_rl_actions np.array([0] * sum(non_lane_changing_veh)) IndexError: boolean index did not match indexed array along dimension 0; dimension is 0 but corresponding boolean dimension is 1

i do not know what the code(

non_lane_changing_veh = \ [self.time_counter <= self.env_params.additional_params["lane_change_duration"]

• self.k.vehicle.get_last_lc(veh_id) for veh_id in sorted_rl_ids]

) means,because non_lane_changing_veh does not look like an integer. Anybody tell me what is wrong, I think the code is not correct