[inference]fix import bug and delete down useless init

[CjhHa1]

📌 Checklist before creating the PR

• I have created an issue for this PR for traceability
• The title follows the standard format: [doc/gemini/tensor/...]: A concise description
• I have added relevant tags if possible for us to better distinguish different PRs

🚨 Issue number

Link this PR to your issue with words like fixed to automatically close the linked issue upon merge

e.g. fixed #1234, closed #1234, resolved #1234

📝 What does this PR do?

Summarize your work here.
if you have any plots/diagrams/screenshots/tables, please attach them here.
This PR fix the import bugs and delete useless inits

💥 Checklist before requesting a review

• I have linked my PR to an issue (instruction)
• My issue clearly describes the problem/feature/proposal, with diagrams/charts/table/code if possible
• I have performed a self-review of my code
• I have added thorough tests.
• I have added docstrings for all the functions/methods I implemented

⭐️ Do you enjoy contributing to Colossal-AI?

• 🌝 Yes, I do.
• 🌚 No, I don't.

Tell us more if you don't enjoy contributing to Colossal-AI.

[github-actions]

The code coverage for the changed files is 11%.

Click me to view the complete report

Name                                                        Stmts   Miss  Cover
-------------------------------------------------------------------------------
colossalai/inference/tensor_parallel/modeling/__init__.py       4      4     0%
colossalai/inference/tensor_parallel/modeling/_utils.py        36     36     0%
colossalai/inference/tensor_parallel/modeling/llama.py        155    155     0%
colossalai/inference/tensor_parallel/policies/chatglm2.py      43     43     0%
colossalai/inference/tensor_parallel/policies/llama.py         49     49     0%
colossalai/kernel/triton/__init__.py                           16      3    81%
tests/test_infer/test_llama_infer.py                           40     15    62%
-------------------------------------------------------------------------------
TOTAL                                                         343    305    11%

[yuanheng-zhao]

LGTM, LLAMA benchmark works as usual

[github-actions]

The code coverage for the changed files is 11%.

Click me to view the complete report

Name                                                        Stmts   Miss  Cover
-------------------------------------------------------------------------------
colossalai/inference/tensor_parallel/modeling/__init__.py       4      4     0%
colossalai/inference/tensor_parallel/modeling/_utils.py        33     33     0%
colossalai/inference/tensor_parallel/modeling/llama.py        155    155     0%
colossalai/inference/tensor_parallel/policies/chatglm2.py      43     43     0%
colossalai/inference/tensor_parallel/policies/llama.py         49     49     0%
colossalai/kernel/triton/__init__.py                           16      3    81%
tests/test_infer/test_llama_infer.py                           40     15    62%
-------------------------------------------------------------------------------
TOTAL                                                         340    302    11%