Merge pull request !1157 from ms_yan/concat_dataset

Merge pull request !1126 from xiefangqi/voc_support_detection

change to use __add__ operation instead ds.concat

Merge pull request !1171 from fary86/adjust_onnx_related_uts

Merge pull request !1015 from candanzg/me_with_shape

Merge pull request !1026 from peixu_ren/custom_pp_ops

Merge pull request !1084 from SanjayChan/04quant

Merge pull request !1089 from ghzl/add-get-lr-base-on-parameter

Merge pull request !1069 from 李鸿章/context_manager

Merge pull request !1094 from zhouneng/add_vm_support_l2normalize

Signed-off-by: candanzg <zhangshucheng@huawei.com>

Merge pull request !1121 from lihongkang/master

Merge pull request !999 from liyong126/mindrecord_file_list

Merge pull request !1042 from jinyaohui/clean_pylint

Merge pull request !1082 from hewei/support_cont_break

To handle 'break' and 'continue' statement, a loop context is pushed
to a stack before we parse the loop body, and pop it after body parsed.
When a 'break', 'continue' statement is encountered, we retrieve current
loop contex from the stack, and let the current block jump to the end
block or header block;

For 'break' statement, we added an extra 'end_block' follow the 'after_block',
because 'after_block' is called from a ContionalJump in 'header_block', it can
not be set as jump target from other place. to support 'break', we let loop
body jump to the 'end_block' at the 'break' point. and 'after_block'
maybe a good place to handle loop 'else' clause in the future.

Handle 'pass' is simple, just bypass it when doing parse.

Merge pull request !1110 from lichen/fix_gatherv2_and_dataset_bug

Merge pull request !1038 from jinyaohui/clean_context

Merge pull request !1070 from liuxiao/ops-for-VM

Merge pull request !1056 from Xiaoda/memory-estimation-in-inference-phase

Merge pull request !1093 from yihuaijie/master

Merge pull request !683 from xychow/bypass-renorm-and-specialize-hypermap-parameter

Merge pull request !1062 from liuxiao/softplus-softplusgrad

Merge pull request !1050 from vlne-v1/I1GEPN-check-bprop-error-loss-scale-wrap

Merge pull request !997 from jiangjinsheng/log1p

Merge pull request !1017 from jinyaohui/context_opt

Merge pull request !766 from gongchen/nest_loop

Merge pull request !1065 from ghzl/improve-parameter-groups