Check-in user guide for w4a16 LLM deployment (#224)

lvhan028 · web-flow · commit 8e8629de4973 · 2023-08-14T17:23:43.000+08:00
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diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ ______________________________________________________________________
 
 ## News 🎉
 
-- \[2023/08\] TurboMind supports 4-bit inference, 2.4x faster than FP16, the fastest open-source implementation🚀.
+- \[2023/08\] TurboMind supports 4-bit inference, 2.4x faster than FP16, the fastest open-source implementation🚀. Check [this](./docs/en/w4a16.md) guide for detailed info
 - \[2023/08\] LMDeploy has launched on the [HuggingFace Hub](https://huggingface.co/lmdeploy), providing ready-to-use 4-bit models.
 - \[2023/08\] LMDeploy supports 4-bit quantization using the [AWQ](https://arxiv.org/abs/2306.00978) algorithm.
 - \[2023/07\] TurboMind supports Llama-2 70B with GQA.
diff --git a/README_zh-CN.md b/README_zh-CN.md
@@ -13,7 +13,7 @@ ______________________________________________________________________
 
 ## 更新 🎉
 
-- \[2023/08\] TurboMind 支持 4-bit 推理，速度是 FP16 的 2.4 倍，是目前最快的开源实现🚀
+- \[2023/08\] TurboMind 支持 4-bit 推理，速度是 FP16 的 2.4 倍，是目前最快的开源实现🚀。部署方式请看[这里](./docs/zh_cn/w4a16.md)
 - \[2023/08\] LMDeploy 开通了 [HuggingFace Hub](https://huggingface.co/lmdeploy) ，提供开箱即用的 4-bit 模型
 - \[2023/08\] LMDeploy 支持使用 [AWQ](https://arxiv.org/abs/2306.00978) 算法进行 4-bit 量化
 - \[2023/07\] TurboMind 支持使用 GQA 的 Llama-2 70B 模型
diff --git a/benchmark/profile_generation.py b/benchmark/profile_generation.py
@@ -3,6 +3,7 @@
 import time
 from queue import Queue
 from threading import Thread
+from typing import List
 
 import fire
 import numpy as np
@@ -29,25 +30,29 @@ def infer(model, session_id: int, input_ids: str, output_seqlen: int,
             tokens.append(token)
 
         # TODO: ignore first token
-        first_token_latency = timestamps[0] - start
+        first_token_latency = np.round(timestamps[0] - start, 2)
         if len(timestamps) == 1:
-            token_latency = timestamps[0] - start
+            token_latency = np.round(timestamps[0] - start, 2)
             token = tokens[0]
         else:
-            token_latency = timestamps[-1] - timestamps[0]
+            token_latency = np.round(timestamps[-1] - timestamps[0], 2)
             token = tokens[-1] - tokens[0]
         stats.append([first_token_latency, token, token_latency])
     que.put((session_id, stats))
 
 
-def warmup(model, concurrency: int, output_seqlen: int, warmup_round: int = 4):
+def warmup(model,
+           concurrency: int,
+           input_ids: List[int],
+           output_seqlen: int,
+           warmup_round: int = 2):
     print('start to warmup ...')
 
     def _infer(model, session_id):
         chatbot = model.create_instance()
         for _ in range(warmup_round):
             for _ in chatbot.stream_infer(session_id,
-                                          input_ids=[1],
+                                          input_ids=input_ids,
                                           request_output_len=output_seqlen,
                                           sequence_start=True,
                                           sequence_end=True,
@@ -82,11 +87,12 @@ def main(model_path: str,
     tokenizer = Tokenizer(tokenizer_model_path)
     tm_model = TurboMind(model_path=model_path, tp=tp)
 
-    warmup(tm_model, concurrency, output_seqlen)
-
     # make up a prompt that can be tokenized into {input_seqlen} tokens
     prompt = '' if input_seqlen == 0 else 'hi' + ' hi' * (input_seqlen - 1)
     input_ids = tokenizer.encode(prompt)
+
+    warmup(tm_model, concurrency, input_ids, output_seqlen)
+
     que = Queue()
     procs = []
     _start = time.perf_counter()
@@ -134,7 +140,7 @@ def main(model_path: str,
           f'{first_token_latency_ave:.2f}s\ntoken latency(min, max, ave): '
           f'{token_latency_min:.2f}s, {token_latency_max:.2f}s, '
           f'{token_latency_ave:.2f}s\n'
-          f'throughput: {throughput} token/s\n{"-" * 50}')
+          f'throughput: {throughput:.2f} token/s\n{"-" * 50}')
 
 
 if __name__ == '__main__':
diff --git a/docs/en/serving.md b/docs/en/serving.md
@@ -34,19 +34,6 @@ bash workspace/service_docker_up.sh
 
 </details>
 
-<details open>
-<summary><b>7B with INT4 weight only quantization</b></summary>
-
-```shell
-python3 -m lmdeploy.serve.turbomind.deploy llama2 /path/to/llama-2-7b-chat-hf \
-    --model_format awq \
-    --group_size 128 \
-    --quant_path /path/to/awq-quant-weight.pt
-bash workspace/service_docker_up.sh
-```
-
-</details>
-
 ## Serving [LLaMA](https://github.com/facebookresearch/llama)
 
 Weights for the LLaMA models can be obtained from by filling out [this form](https://docs.google.com/forms/d/e/1FAIpQLSfqNECQnMkycAp2jP4Z9TFX0cGR4uf7b_fBxjY_OjhJILlKGA/viewform)
diff --git a/docs/en/w4a16.md b/docs/en/w4a16.md
@@ -0,0 +1,101 @@
+# W4A16 LLM Model Deployment
+
+LMDeploy supports LLM model inference of 4-bit weight, with the minimum requirement for NVIDIA graphics cards being sm80, such as A10, A100, Geforce 30/40 series.
+
+Before proceeding with the inference, please ensure that lmdeploy(>=v0.0.4) is installed.
+
+```shell
+pip install lmdeploy
+```
+
+## 4-bit LLM model Inference
+
+You can download the pre-quantized 4-bit weight models from LMDeploy's [model zoo](https://huggingface.co/lmdeploy) and conduct inference using the following command.
+
+Alternatively, you can quantize 16-bit weights to 4-bit weights following the ["4-bit Weight Quantization"](#4-bit-weight-quantization) section, and then perform inference as per the below instructions.
+
+Take the 4-bit Llama-2-chat-7B model from the model zoo as an example:
+
+```shell
+git-lfs install
+git clone https://huggingface.co/lmdeploy/llama2-chat-7b-w4
+```
+
+As demonstrated in the command below, first convert the model's layout using `turbomind.deploy`, and then you can interact with the AI assistant in the terminal
+
+```shell
+
+## Convert the model's layout and store it in the default path, ./workspace.
+python3 -m lmdeploy.serve.turbomind.deploy \
+    --model-name llama2 \
+    --model-path ./llama2-chat-7b-w4 \
+    --model-format awq \
+    --group-size 128
+
+## inference
+python3 -m lmdeploy.turbomind.chat ./workspace
+```
+
+## Serve with gradio
+
+If you wish to interact with the model via web ui, please initiate the gradio server as indicated below:
+
+```shell
+python3 -m lmdeploy.serve.turbomind ./workspace --server_name {ip_addr} ----server_port {port}
+```
+
+Subsequently, you can open the website `http://{ip_addr}:{port}` in your browser and interact with the model
+
+## Inference Performance
+
+We benchmarked the Llama-2-7B-chat and Llama-2-13B-chat models with 4-bit quantization on NVIDIA GeForce RTX 4090 using [profile_generation.py](https://github.com/InternLM/lmdeploy/blob/main/benchmark/profile_generation.py). And we measure the token generation throughput (tokens/s) by setting a single prompt token and generating 512 tokens. All the results are measured for single batch inference.
+
+| model            | llm-awq | mlc-llm | turbomind |
+| ---------------- | ------- | ------- | --------- |
+| Llama-2-7B-chat  | 112.9   | 159.4   | 206.4     |
+| Llama-2-13B-chat | N/A     | 90.7    | 115.8     |
+
+Memory (GB) comparison results between 4-bit and 16-bit model with context size 2048 and 4096 respectively,
+
+| model            | 16bit(2048) | 4bit(2048) | 16bit(4096) | 4bit(4096) |
+| ---------------- | ----------- | ---------- | ----------- | ---------- |
+| Llama-2-7B-chat  | 15.1        | 6.3        | 16.2        | 7.5        |
+| Llama-2-13B-chat | OOM         | 10.3       | OOM         | 12.0       |
+
+```shell
+python benchmark/profile_generation.py \
+  ./workspace \
+  --concurrency 1 --input_seqlen 1 --output_seqlen 512
+```
+
+## 4-bit Weight Quantization
+
+It includes two steps:
+
+- generate quantization parameter
+- quantize model according to the parameter
+
+### Step 1: Generate Quantization Parameter
+
+```shell
+python3 -m lmdeploy.lite.apis.calibrate \
+  --model $HF_MODEL \
+  --calib_dataset 'c4' \             # Calibration dataset, supports c4, ptb, wikitext2, pileval
+  --calib_samples 128 \              # Number of samples in the calibration set, if memory is insufficient, you can appropriately reduce this
+  --calib_seqlen 2048 \              # Length of a single piece of text, if memory is insufficient, you can appropriately reduce this
+  --work_dir $WORK_DIR \             # Folder storing Pytorch format quantization statistics parameters and post-quantization weight
+```
+
+### Step2: Quantize Weights
+
+LMDeploy employs AWQ algorithm for model weight quantization.
+
+```shell
+python3 -m lmdeploy.lite.apis.auto_awq \
+  --model $HF_MODEL \
+  --w_bits 4 \                       # Bit number for weight quantization
+  --w_group_size 128 \               # Group size for weight quantization statistics
+  --work_dir $WORK_DIR \             # Directory saving quantization parameters from Step 1
+```
+
+After the quantization is complete, the quantized model is saved to `$WORK_DIR`. Then you can proceed with model inference according to the instructions in the ["4-Bit Weight Model Inference"](#4-bit-llm-model-inference) section.
diff --git a/docs/zh_cn/w4a16.md b/docs/zh_cn/w4a16.md
@@ -0,0 +1,97 @@
+# W4A16 LLM 模型部署
+
+LMDeploy 支持 4bit 权重模型的推理，**对 NVIDIA 显卡的最低要求是 sm80**，比如A10，A100，Gerforce 30/40系列。
+
+在推理之前，请确保安装了 lmdeploy，版本 >= v0.0.4
+
+```shell
+pip install lmdeploy
+```
+
+## 4bit 权重模型推理
+
+你可以直接从 LMDeploy 的 [model zoo](https://huggingface.co/lmdeploy) 下载已经量化好的 4bit 权重模型，直接使用下面的命令推理。也可以根据["4bit 权重量化"](#4bit-权重量化)章节的内容，把 16bit 权重量化为 4bit 权重，然后再按下述说明推理
+
+以 4bit 的 Llama-2-chat-7B 模型为例，可以从 model zoo 直接下载：
+
+```shell
+git-lfs install
+git clone https://huggingface.co/lmdeploy/llama2-chat-7b-w4
+```
+
+执行以下命令，即可在终端与模型对话：
+
+```shell
+
+## 转换模型的layout，存放在默认路径 ./workspace 下
+python3 -m lmdeploy.serve.turbomind.deploy \
+    --model-name llama2 \
+    --model-path ./llama2-chat-7b-w4 \
+    --model-format awq \
+    --group-size 128
+
+## 推理
+python3 -m lmdeploy.turbomind.chat ./workspace
+```
+
+## 启动 gradio 服务
+
+如果想通过 webui 与模型对话，请执行以下命令启动 gradio 服务
+
+```shell
+python3 -m lmdeploy.serve.turbomind ./workspace --server_name {ip_addr} ----server_port {port}
+```
+
+然后，在浏览器中打开 http://{ip_addr}:{port}，即可在线对话
+
+## 推理速度
+
+我们在 NVIDIA GeForce RTX 4090 上使用 [profile_generation.py](https://github.com/InternLM/lmdeploy/blob/main/benchmark/profile_generation.py)，分别测试了 4-bit Llama-2-7B-chat 和 Llama-2-13B-chat 模型的 token 生成速度。测试配置为 batch size = 1，(prompt_tokens, completion_tokens) = (1, 512)
+
+| model            | llm-awq | mlc-llm | turbomind |
+| ---------------- | ------- | ------- | --------- |
+| Llama-2-7B-chat  | 112.9   | 159.4   | 206.4     |
+| Llama-2-13B-chat | N/A     | 90.7    | 115.8     |
+
+上述两个模型的16bit 和 4bit 权重，分别使用 turbomind 推理时，各自在context size 为 2048 和 4096 配置下，所占的显存对比如下：
+
+| model            | 16bit(2048) | 4bit(2048) | 16bit(4096) | 4bit(4096) |
+| ---------------- | ----------- | ---------- | ----------- | ---------- |
+| Llama-2-7B-chat  | 15.1        | 6.3        | 16.2        | 7.5        |
+| Llama-2-13B-chat | OOM         | 10.3       | OOM         | 12.0       |
+
+```shell
+python benchmark/profile_generation.py \
+  ./workspace \
+  --concurrency 1 --input_seqlen 1 --output_seqlen 512
+```
+
+## 4bit 权重量化
+
+4bit 权重量化包括 2 步：
+
+- 生成量化参数
+- 根据量化参数，量化模型权重
+
+### 第一步：生成量化参数
+
+```shell
+python3 -m lmdeploy.lite.apis.calibrate \
+  --model $HF_MODEL \
+  --calib_dataset 'c4' \             # 校准数据集，支持 c4, ptb, wikitext2, pileval
+  --calib_samples 128 \              # 校准集的样本数，如果显存不够，可以适当调小
+  --calib_seqlen 2048 \              # 单条的文本长度，如果显存不够，可以适当调小
+  --work_dir $WORK_DIR \             # 保存 Pytorch 格式量化统计参数和量化后权重的文件夹
+```
+
+### 第二步：量化权重模型
+
+LMDeploy 使用 AWQ 算法对模型权重进行量化。在执行下面的命令时，需要把步骤1的`$WORK_DIR`传入。量化结束后，权重文件也会存放在这个目录中。然后就可以根据 ["4bit权重模型推理"](#4bit-权重模型推理)章节的说明，进行模型推理。
+
+```shell
+python3 -m lmdeploy.lite.apis.auto_awq \
+  --model $HF_MODEL \
+  --w_bits 4 \                       # 权重量化的 bit 数
+  --w_group_size 128 \               # 权重量化分组统计尺寸
+  --work_dir $WORK_DIR \             # 步骤 1 保存量化参数的目录
+```
