Experiments of OCR CTC on parallel executor

[wanghaoshuang]

ID	batch_size	GPUs	max_average_window	average_window	time_per_pass	state
1	32	4	15000	0.15	1,735.663s	running
2	32	1	15000	0.15	1,747.921s	running
3	128	4	3750	0.04

Details: https://docs.google.com/spreadsheets/d/13FTzN55CS8K8jvd2jyBI__PjGuuwBT3l6f4INLCTyRs/edit?usp=sharing