release initial code

Co-authored-by: Ying Sheng <sqy1415@gmail.com>
Co-authored-by: Liangsheng Yin <hnyls2002@gmail.com>
Co-authored-by: Zhiqiang Xie <xiezhq@stanford.edu>
Co-authored-by: parasol-aser <3848358+parasol-aser@users.noreply.github.com>
Co-authored-by: LiviaSun <33578456+ChuyueSun@users.noreply.github.com>
Co-authored-by: Cody Yu <hao.yu.cody@gmail.com>

benchmark/hellaswag/README.md

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+## Download data
+```
+wget https://raw.githubusercontent.com/rowanz/hellaswag/master/data/hellaswag_val.jsonl
+```
+
+## Run benchmark
+
+### Benchmark sglang
+```
+python -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000
+```
+
+```
+python3 bench_sglang.py --num-questions 200
+```
+
+
+### Benchmark vllm
+```
+python3 -m vllm.entrypoints.api_server --tokenizer-mode auto --model meta-llama/Llama-2-7b-chat-hf --disable-log-requests --port 21000
+```
+
+```
+python3 bench_other.py --num-questions 200 --backend vllm
+```
+
+
+### Benchmark lightllm
+```
+# A10G
+python -m lightllm.server.api_server --tokenizer_mode auto --model_dir ~/model_weights/llama-2-7b-chat-hf --max_total_token_num 16000 --port 22000
+```
+
+```
+python3 bench_other.py --num-questions 200 --backend lightllm
+```
+
+
+### Benchmark guidance
+```
+CUDA_VISIBLE_DEVICES=0,1 python3 bench_other.py --num-questions 200 --backend guidance --parallel 1
+```
+
+
+### Benchmark lmql
+```
+lmql serve-model meta-llama/Llama-2-7b-chat-hf --cuda --port 23000
+```
+
+```
+python3 bench_other.py --num-questions 200 --backend lmql --port 23000 --parallel 1
+```