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.

Merge pull request !2070 from chenzupeng/r0.3

Merge pull request !1995 from lianliguang/r0.3

Merge pull request !1948 from zhaoting/r0.3

Merge pull request !2049 from panfengfeng/update_mobilenetv2_codes

Merge pull request !2041 from chenzhongming/r0.3

Merge pull request !2035 from guozhijian/add_zhwiki_enwiki_preprocess

Merge pull request !2025 from liubuyu/r0.3

Merge pull request !2033 from guozhijian/fix_seekg_failed

Merge pull request !2011 from chenzhongming/r0.3

Merge pull request !2001 from guozhijian/fix_MindDataset_distribute_bug