Merge pull request !3659 from meixiaowei/r0.6

Merge pull request !3558 from guozhijian/fix_dataset_none_hung

Merge pull request !3586 from guansongsong/gss/fix_python_api_for_r0.6

Merge pull request !3584 from guansongsong/gss/fix_cache

Merge pull request !3632 from Kang/r0.6

Merge pull request !3604 from peixu_ren/r0.6

Merge pull request !3663 from ZPaC/r0.6-fix-sgd

Merge pull request !3652 from panfengfeng/add_epoch_num_description

Merge pull request !3634 from lianliguang/r0.6

Merge pull request !3646 from liyong126/r0.6_fix_minrecord_bug

Merge pull request !3639 from yanghaitao/yht_generator_timeout_r0.6

Merge pull request !3640 from zhangbuxue/support_bprop_for_const_in_pynative_and_develop_stridedslice_and_isinstance

Merge pull request !3633 from panfengfeng/fix_dataset_train_gil_of_gpu

Merge pull request !3641 from looop5/akg_r0.6

Merge pull request !3623 from vlne-v1/amp_doc_r0.6

Merge pull request !3626 from guozhijian/fix_device_occupied_tdt_hung_r0.6

Merge pull request !3629 from xiefangqi/md_fix_numpyslice_r0.6

Merge pull request !3589 from guansongsong/fix_cache_core_for_r0.6

Merge pull request !3579 from meixiaowei/r0.6

Merge pull request !3566 from ms_yan/r0.6_api_format

Merge pull request !3599 from riemann_penn/merge_fix_sparse_doc_to_r0.6

Merge pull request !3595 from jinyaohui/sink_size

Merge pull request !3582 from xiefangqi/r0.6

Merge pull request !3572 from liyong126/r0.6_fix_save_pydoc_log

Merge pull request !3580 from gziyan/fix_allreduce_fusion

Merge pull request !3533 from dinghao/r0.6