why randomly select one subject in data_loader.py

[HJHjiahao]

In line 108 of your data_loader.py, why only select one subject instead of performing subsequent operations on all subjects? Thanks in advance!

[1qingqing1]

i have the same question. Do you know why now?

[yongqsarah]

I have the same question.

[huyidu]

for batch ?

[peter-xbs]

如果这里不进行采样的话，后续代码的实现会有复杂很多；整体应该是为了实现上更加简洁