add explicit paramter for infinite iterators

set appropriate value for num_epoch param for iteratos

fix long lines

remove trailing whitespace

fixed typo

remove comment

fixed comments

fixed test

Fix error msg of pythontokenizer

ci fix 1

fix ci 2

fix ci 3

fix ci 4

fix ci 5

fix ci 6

fix ci 7

change var name in CelebA from dataset_type to usage

address review cmts

fix cpp ut fail

change mode to usage in VOCDataset

fix cmts

fix ci test case fail

update cifar10 dataset
fixing missing error handling code in validator