code: def _flatten_list(l):
      assert isinstance(l, (list, tuple))
      assert len(l) > 0
      assert all([len(l_) > 0 for l_ in l])
  
      return [l__ for l_ in l for l__ in l_]
  
file_path: baselines/baselines/common/vec_env/subproc_vec_env.py
imports: import multiprocessing
  import numpy
  from .vec_env import VecEnv, CloudpickleWrapper, clear_mpi_env_vars
label_desc: Use image node_id 3 for calling a global function with example usage: _flatten_list(l) and returns: unknown