Merge pull request !2617 from ougongchang/fix_collect_freq_r0.5

Merge pull request !2596 from zhoufeng/assign-order-before-jump-r0.5

Merge pull request !2613 from yanghaitao/yht_fastrcnn_0.5

Before, we only decide whether to collect data by current step,
it will not work well in dataset sink mode, so we check to see
if it's a dataset sink mode, and decide whether to collect data.

!2469 add pretrain for lstm & vgg16 and remove lstm/vgg16/googlenet from directory 'mindspore/model_zoo'
Merge pull request !2469 from caojian05/ms_master_dev

Merge pull request !2577 from Chong/r5

Merge pull request !2581 from TronZhang/add_test_lamb_r0.5

Merge pull request !2597 from DeshiChen/0624_akg_batmatmul_r0.5

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

Merge pull request !2588 from chenzhongming/r0.5

Merge pull request !2573 from jinyaohui/print

Merge pull request !2575 from ms_yan/r0.5_GetTensor

Merge pull request !2496 from 李鸿章/callback

Merge pull request !2571 from jinyaohui/backend

Merge pull request !2555 from chenzhongming/r0.5

Merge pull request !2536 from chenfei_mindspore/stop-in-tuple-get-item-of-update-call-real-input

Merge pull request !2486 from ougongchang/fix_summary_optimizer_r0.5

Merge pull request !2516 from lilei/save_file

Merge pull request !2522 from wukesong/wks-r0.5

Merge pull request !2507 from heleiwang/r0.5_fix_misspell

Merge pull request !2513 from laiyongqiang/r0.5

Merge pull request !2525 from liuwenhao/r0.5

Merge pull request !2523 from zhoufeng/disable-cuda9-r0.5

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

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

Merge pull request !2509 from zhoufeng/graph-kernel-use-control-sink-r0.5