Merge pull request !951 from guozhijian/fix_read_by_columns

Merge pull request !982 from JesseKLee/bad_rc

Merge pull request !969 from liyong126/fix_mindrecord_pk_sampler

Merge pull request !974 from zhaoting/master

Merge pull request !968 from zhouneng/add_examples_for_nn

Merge pull request !965 from JichenZhao/globalbn_doc_fix

Merge pull request !937 from JoyLvliang/fix-set-output-addr-fail-in-gpu-pynative

Merge pull request !935 from zhangbuxue/develop_scatter_max_op_and_dock_ge

Merge pull request !970 from huanghui/update-print-log-level

Merge pull request !957 from jiangjinsheng/space_to_batch

Merge pull request !322 from chenweifeng/rmsprop

Merge pull request !323 from chenweifeng/concat

Merge pull request !324 from chenweifeng/slice

Merge pull request !372 from chenweifeng/batchmatmul

Merge pull request !502 from chenweifeng/gelu

Merge pull request !516 from chenweifeng/tanh

Merge pull request !945 from chenweifeng/unary

Merge pull request !812 from jinyaohui/train_eval

Merge pull request !962 from VectorSL/conv-init-update

Merge pull request !859 from Xiaoda/support-inferring-phase-parallel-strategy-searching

Merge pull request !934 from chenweifeng/broadcast

Merge pull request !955 from panfengfeng/panff/fix_code_format

Merge pull request !959 from liuxiao/ops-for-VM

Merge pull request !964 from Margaret_wangrui/master

Merge pull request !963 from chenfei_mindspore/fix-bug-of-too-big-static-mem

Merge pull request !966 from zhoufeng/me-ge-link-hccl

Merge pull request !637 from ghzl/learning-rate-make-group-mode