Merge pull request !7730 from luoyang/c-api-pyfunc

1. Start the child process in the init phase
2. At the beginning of each epoch, the child process is not recreated, but the child process created at the beginning is used

Merge pull request !6905 from lixiachen/CacheOp_dev

Merge pull request !6017 from ZiruiWu/per_batch_map_multi_col

Merge pull request !5930 from Jamie/CacheOp_dev

decided to use project after batch as well

per_batch_map 1->x colunm works

add more test case

add test cases, project after map

col order hahaah

fix ci

add test cases

addr review cmts

ci

fix build err

fix test case failure

ci

Merge pull request !6301 from nhussain/c_py_compose

Leaf ops do self-reset.

embed python compose op

add implicit compose op

more tests

Merge pull request !6588 from yanghaitao/yht_protect_pyfunc_timeout

Merge pull request !6576 from heleiwang/mod_tfrecord_api

Merge pull request !6472 from yanghaitao/yht_celeba_get_dataset_size

Merge pull request !6479 from yanghaitao/yht_bucket_batch_ci

Merge pull request !6451 from yanghaitao/yht_celeba_log

Merge pull request !6346 from yanghaitao/yht_pyfunc_timeout

Merge pull request !6221 from anzhengqi/stop-send-at-eos

Merge pull request !6113 from xiefangqi/md_unify_seed

Merge pull request !6142 from xiefangqi/md_fix_map_issue

Merge pull request !6090 from lixiachen/disable_cache

fix CI

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

change ImagefolderDV2 name

change ds.transforms.vision to ds.vision

change batch api to match map api more closely

compose op changes

test_pylint

remove compose op from vision, move to transform module, refactor map and batch to use column_order