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* refactor parallel action

* polish unit tests

* polish test_gpt

* update op unit tests

* update test model

* refactor colo-tensor and update linear op

* polish code

* polish code

* update ops and unit tests

* update unit tests

* polish code

* rename dist_spec module

* polish code

* polish code

* remove unneeded import

* fix pipelinable

* derive compute pattern from dist spec

* polish code

* add dist spec

* update linear op

* polish code

* polish code

* update embedding op

* polish unit tests

* polish unit tests

* polish comments

* polish code

* add test_dist_spec_mgr

* polish code

* refactor folder structure

* polish unit tests

* add get_process_group() for TensorSpec

* polish code

* refine linear and add function to ColoTensor

* add gather for layernorm

* polish

* polish

This reverts commit ac88de6d.

* revert zero tensors back

* [tensor] init row 1d linear