op_id,op_type,num_workers,output_queue_size,output_queue_average_size,output_queue_length,output_queue_usage_rate,sample_interval,parent_id,children_id
0,Batch,4,,,,,10,,[1]
1,Shuffle,1,"[10, 20, 30]",20.0,64,0.3125,10,0,"[2, 3]"
2,TFReader,4,"[10, 20, 30]",20.0,64,0.3125,10,1,
3,TFReader,4,"[10, 20, 30]",20.0,64,0.3125,10,1,