Why batchsize is 1 by default

[darknli]

Thank you for your code! We know that generally larger batchsize is more beneficial to the result,I have seen that the batchsize of many open source code for split tasks is set to 1 by default, but why?Looking forward to your reply!

[JianqiangWan]

Performance is good when the batchsize is set to 1, larger may be better, but you need to pad the input image to a uniform size to form a larger batch.