* fix_auc in instag task

* fix_auc in instag task

* fix_auc in instag task

* fix opmaker error

* optmize default value of ins_tag

* fix multiary

* fix multiary

* reback ctr_metric_bundle

* reback ctr_metric_bundle

* for ci auc_test

* code style

* code style fix

* suit paddle

* suit paddle

* update code example

* complete Auc unittest

* set asdispensable

* set optional

* compatable and code style

* fix cu

* fix cu

* for ci win

* update unittests of auc

* update code doc by reviews

* change code doc by reviews