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* refactor graph store for new kvstore.

* fix kvstore.

* fix.

* fix lint complains.

* add docstring.

* small fix in graph partition book.

* fix.

* remove tests

* disable sampling.

* Revert "disable sampling."

This reverts commit 70451008f61ff1481d5dadbf8bd199470aee559d.

* Revert "remove tests"

This reverts commit 1394364243bdd73b669abde6193a74e2cda5521d.