GitLab

* add eval.

* extend DistTensor.

* fix.

* add barrier.

* add more print.

* add more checks in kvstore.

* fix lint.

* get all neighbors for eval.

* reorganize.

* fix.

* fix.

* fix.

* fix test.

* add reuse_if_exist.

* add test for reuse_if_exist.

* fix lint.

* fix bugs.

* fix.

* print errors of tcp socket.

* support delete tensors.

* fix lint.

* fix

* fix example
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