code: def flatten(l):
      """Merges a list of lists into a single list."""
      return [item for sublist in l for item in sublist]
  
file_path: PaddleHub/modules/video/classification/videotag_tsn_lstm/resource/metrics/youtube8m/eval_util.py
imports: import datetime
  import numpy
  from .None import mean_average_precision_calculator
  from .None import average_precision_calculator
label_desc: Use image node_id 1 for calling a global function with example usage: flatten(l) and returns: unknown