[legacy] clean up legacy code (#4743)

* [legacy] remove outdated codes of pipeline (#4692)

* [legacy] remove cli of benchmark and update optim (#4690)

* [legacy] remove cli of benchmark and update optim

* [doc] fix cli doc test

* [legacy] fix engine clip grad norm

* [legacy] remove outdated colo tensor (#4694)

* [legacy] remove outdated colo tensor

* [test] fix test import

* [legacy] move outdated zero to legacy (#4696)

* [legacy] clean up utils (#4700)

* [legacy] clean up utils

* [example] update examples

* [legacy] clean up amp

* [legacy] fix amp module

* [legacy] clean up gpc (#4742)

* [legacy] clean up context

* [legacy] clean core, constants and global vars

* [legacy] refactor initialize

* [example] fix examples ci

* [example] fix examples ci

* [legacy] fix tests

* [example] fix gpt example

* [example] fix examples ci

* [devops] fix ci installation

* [example] fix examples ci

colossalai/legacy/tensor/__init__.py

@@ -0,0 +1,17 @@
+from . import distspec
+from .compute_spec import ComputePattern, ComputeSpec
+from .dist_spec_mgr import DistSpecManager
+from .distspec import ReplicaSpec, ShardSpec
+from .process_group import ProcessGroup
+from .tensor_spec import ColoTensorSpec
+
+__all__ = [
+    'ComputePattern',
+    'ComputeSpec',
+    'distspec',
+    'DistSpecManager',
+    'ProcessGroup',
+    'ColoTensorSpec',
+    'ShardSpec',
+    'ReplicaSpec',
+]