code: def f(v):
      frame_number, ip_dst, ip_proto = tf.io.decode_csv(
          v, [[0], [""], [0]], field_delim="\t"
      )
      return frame_number, ip_dst, ip_proto
  
label_desc: Use image node_id 1 for calling a global function with example usage: f(v) and returns: frame_number,  ip_dst,  ip_proto