Merge pull request !2291 from chenzhongming/r0.3

Merge pull request !2302 from Margaret_wangrui/r0.3

Merge pull request !2261 from jjfeing/r0.3_log

Merge pull request !2228 from yanghaitao/yht_get_dataset_size

Merge pull request !2099 from laiyongqiang/r0.3_summary

Merge pull request !2277 from xianwz/r0.3

Merge pull request !2232 from wandongdong/r0.3

Merge pull request !2248 from Margaret_wangrui/r0.3

Merge pull request !2196 from TronZhang/fix_log_level

Merge pull request !2195 from 王东旭/r0.3

fix FakeQuantPerLayer/FakeQuantPerLayerGrad symmetric bug and remove BNTrainingReduceGrad/BNTrainingUpdateGrad

Merge pull request !2172 from guozhijian/sync_fix_info

Merge pull request !2122 from guozhijian/add_set_dataset_size_for_minddataset

Merge pull request !2115 from chenzhongming/r0.3

Merge pull request !2115 from chenzhongming/r0.3

Merge pull request !2031 from gukecai/add-event-for-hcom

Merge pull request !2104 from chenzhongming/r0.3

Merge pull request !2090 from panfengfeng/resnet_quant_data_aug_change

Merge pull request !2079 from gongchen/r0.3_graph_kernel_clean

Merge pull request !2087 from panfengfeng/mobilenetv2_data_aug_change

Merge pull request !2082 from guozhijian/fix_padded_log_error

Merge pull request !2085 from chenzupeng/r0.3

Merge pull request !2073 from wandongdong/r0.3

- It provides a unified style to express graph and kernel for user.
- It provides a unified IR to represent graph and kernel for developer.
- It breaks the boundary between graph and kernel.
- It provides more opportunities to do compile optimization.