code: def copy_stream(length, low=2, high=15, n=1):
      """Generate `n` random sequences of length `length` and yield with copies."""
      while True:
          res = []
          for _ in range(n):
              seq = np.random.randint(
                  low, high, size=(length,), dtype=np.int32
              )
              res.extend([seq, seq])
          yield res
  
file_path: trax/trax/rl/envs/data_envs.py
imports: import gym
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: copy_stream(length, low, high, n) without return types