Merge pull request !2559 from liuwenhao/rms

Merge pull request !2541 from leopz/master

Merge pull request !2549 from zyli2020/add_model_script_of_wide_deep_for_gpu

Merge pull request !2530 from Chong/zc

Merge pull request !2497 from lichen/fix_hccl_to_support_big_tensor

Merge pull request !2535 from amongo/FixPynativeTensorIndexing

Merge pull request !2543 from amongo/FixApplyRmsprop

Merge pull request !1393 from chenweifeng/adam_weight_decay

Merge pull request !2245 from hewei/decouple_tensor

Merge pull request !2411 from liuxiao/examples

Merge pull request !2517 from chenzhongming/quant

Merge pull request !2499 from yihuaijie/master

Merge pull request !2524 from guozhijian/fix_modify_mindrecord_field_to_image

Merge pull request !2528 from caifubi/clean-codex-and-code-review

Merge pull request !2428 from chenjianping/host_reduce

* change slice setitem to mixed procedure
* add testcase for slice assignment

Merge pull request !2485 from ougongchang/fix_summary_optimizer

Merge pull request !2521 from zhoufeng/disable-cuda9

Merge pull request !2512 from vlne-v1/I1LJMR-quant-the-top-level-add-op-prefix_name-check-error

Merge pull request !1950 from vlne-v1/move-flags-to-construct

Merge pull request !2518 from chenfei_mindspore/stop-in-tuple-get-item-of-update-call-real-input

Merge pull request !2503 from heleiwang/fix_misspell

Merge pull request !2408 from laiyongqiang/remove_reshape

Make sure record the first step data in SummaryCollector, and catch the ValueError when the loss is not a Scalar.

Merge pull request !2487 from caojian05/mindspore_master_bugfix

Signed-off-by: Nzhoufeng <zhoufeng54@huawei.com>