[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* [legacy] remove outdated codes of pipeline (#4692)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* [legacy] remove outdated colo tensor (#4694)

* [legacy] remove outdated colo tensor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* [legacy] move outdated zero to legacy (#4696)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

.github/workflows/doc_test_on_pr.yml

@@ -89,7 +89,7 @@ jobs:
       - name: Install ColossalAI
         run: |
           source activate pytorch
-          pip install -v .
+          CUDA_EXT=1 pip install -v .
 
       - name: Test the Doc
         run: |

.github/workflows/doc_test_on_schedule.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Install ColossalAI
         run: |
-          pip install -v .
+          CUDA_EXT=1 pip install -v .
 
       - name: Install Doc Test Requirements
         run: |

.github/workflows/example_check_on_dispatch.yml

@@ -53,7 +53,7 @@ jobs:
         uses: actions/checkout@v3
       - name: Install Colossal-AI
         run: |
-          pip install -v .
+          CUDA_EXT=1 pip install -v .
       - name: Test the example
         run: |
           dir=${{ matrix.directory }}

.github/workflows/example_check_on_pr.yml

@@ -88,7 +88,7 @@ jobs:
 
       - name: Install Colossal-AI
         run: |
-          pip install -v .
+          CUDA_EXT=1 pip install -v .
 
       - name: Test the example
         run: |

.github/workflows/example_check_on_schedule.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Install Colossal-AI
         run: |
-          pip install -v .
+          CUDA_EXT=1 pip install -v .
 
       - name: Traverse all files
         run: |