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OpenAI-Compatible API Server
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<p><a href="zh/offline_inference.md">简体中文</a></p>
<h1 id="offline-inference">Offline Inference</h1>
<h2 id="1-usage">1. Usage</h2>
<p>FastDeploy supports offline inference by loading models locally and processing user data. Usage examples:</p>
<h3 id="chat-interface-llmchat">Chat Interface (LLM.chat)</h3>
<pre><code class="language-python">from fastdeploy import LLM, SamplingParams
msg1=[
{&quot;role&quot;: &quot;system&quot;, &quot;content&quot;: &quot;I'm a helpful AI assistant.&quot;},
{&quot;role&quot;: &quot;user&quot;, &quot;content&quot;: &quot;把李白的静夜思改写为现代诗&quot;},
]
msg2 = [
{&quot;role&quot;: &quot;system&quot;, &quot;content&quot;: &quot;I'm a helpful AI assistant.&quot;},
{&quot;role&quot;: &quot;user&quot;, &quot;content&quot;: &quot;Write me a poem about large language model.&quot;},
]
messages = [msg1, msg2]
# Sampling parameters
sampling_params = SamplingParams(top_p=0.95, max_tokens=6400)
# Load model
llm = LLM(model=&quot;ERNIE-4.5-0.3B&quot;, tensor_parallel_size=1, max_model_len=8192)
# Batch inference (internal request queuing and dynamic batching)
outputs = llm.chat(messages, sampling_params)
# Output results
for output in outputs:
prompt = output.prompt
generated_text = output.outputs.text
</code></pre>
<p>Documentation for <code>SamplingParams</code>, <code>LLM.generate</code>, <code>LLM.chat</code>, and output structure <code>RequestOutput</code> is provided below.</p>
<blockquote>
<p>Note: For reasoning models, when loading the model, you need to specify the reasoning_parser parameter. Additionally, during the request, you can toggle the reasoning feature on or off by configuring the <code>enable_thinking</code> parameter within <code>chat_template_kwargs</code>.</p>
</blockquote>
<pre><code class="language-python">from fastdeploy.entrypoints.llm import LLM
# 加载模型
llm = LLM(model=&quot;baidu/ERNIE-4.5-VL-28B-A3B-Paddle&quot;, tensor_parallel_size=1, max_model_len=32768, limit_mm_per_prompt={&quot;image&quot;: 100}, reasoning_parser=&quot;ernie-45-vl&quot;)
outputs = llm.chat(
messages=[
{&quot;role&quot;: &quot;user&quot;, &quot;content&quot;: [ {&quot;type&quot;: &quot;image_url&quot;, &quot;image_url&quot;: {&quot;url&quot;: &quot;https://paddlenlp.bj.bcebos.com/datasets/paddlemix/demo_images/example2.jpg&quot;}},
{&quot;type&quot;: &quot;text&quot;, &quot;text&quot;: &quot;图中的文物属于哪个年代&quot;}]}
],
chat_template_kwargs={&quot;enable_thinking&quot;: False})
# 输出结果
for output in outputs:
prompt = output.prompt
generated_text = output.outputs.text
reasoning_text = output.outputs.reasoning_content
</code></pre>
<h3 id="text-completion-interface-llmgenerate">Text Completion Interface (LLM.generate)</h3>
<pre><code class="language-python">from fastdeploy import LLM, SamplingParams
prompts = [
&quot;User: 帮我写一篇关于深圳文心公园的500字游记和赏析。\nAssistant: 好的。&quot;
]
# 采样参数
sampling_params = SamplingParams(top_p=0.95, max_tokens=6400)
# 加载模型
llm = LLM(model=&quot;baidu/ERNIE-4.5-21B-A3B-Base-Paddle&quot;, tensor_parallel_size=1, max_model_len=8192)
# 批量进行推理（llm内部基于资源情况进行请求排队、动态插入处理）
outputs = llm.generate(prompts, sampling_params)
# 输出结果
for output in outputs:
prompt = output.prompt
generated_text = output.outputs.text
</code></pre>
<blockquote>
<p>Note: Text completion interface, suitable for scenarios where users have predefined the context input and expect the model to output only the continuation content. No additional <code>prompt</code> concatenation will be added during the inference process.
For the <code>chat</code> model, it is recommended to use the Chat Interface (<code>LLM.chat</code>).</p>
</blockquote>
<p>For multimodal models, such as <code>baidu/ERNIE-4.5-VL-28B-A3B-Paddle</code>, when calling the <code>generate interface</code>, you need to provide a prompt that includes images. The usage is as follows:</p>
<pre><code class="language-python">import io
import requests
from PIL import Image
from fastdeploy.entrypoints.llm import LLM
from fastdeploy.engine.sampling_params import SamplingParams
from fastdeploy.input.ernie4_5_tokenizer import Ernie4_5Tokenizer
PATH = &quot;baidu/ERNIE-4.5-VL-28B-A3B-Paddle&quot;
tokenizer = Ernie4_5Tokenizer.from_pretrained(PATH)
messages = [
{
&quot;role&quot;: &quot;user&quot;,
&quot;content&quot;: [
{&quot;type&quot;:&quot;image_url&quot;, &quot;image_url&quot;: {&quot;url&quot;:&quot;https://paddlenlp.bj.bcebos.com/datasets/paddlemix/demo_images/example2.jpg&quot;}},
{&quot;type&quot;:&quot;text&quot;, &quot;text&quot;:&quot;图中的文物属于哪个年代&quot;}
]
}
]
prompt = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
images, videos = [], []
for message in messages:
content = message[&quot;content&quot;]
if not isinstance(content, list):
continue
for part in content:
if part[&quot;type&quot;] == &quot;image_url&quot;:
url = part[&quot;image_url&quot;][&quot;url&quot;]
image_bytes = requests.get(url).content
img = Image.open(io.BytesIO(image_bytes))
images.append(img)
elif part[&quot;type&quot;] == &quot;video_url&quot;:
url = part[&quot;video_url&quot;][&quot;url&quot;]
video_bytes = requests.get(url).content
videos.append({
&quot;video&quot;: video_bytes,
&quot;max_frames&quot;: 30
})
sampling_params = SamplingParams(temperature=0.1, max_tokens=6400)
llm = LLM(model=PATH, tensor_parallel_size=1, max_model_len=32768, limit_mm_per_prompt={&quot;image&quot;: 100}, reasoning_parser=&quot;ernie-45-vl&quot;)
outputs = llm.generate(prompts={
&quot;prompt&quot;: prompt,
&quot;multimodal_data&quot;: {
&quot;image&quot;: images,
&quot;video&quot;: videos
}
}, sampling_params=sampling_params)
# 输出结果
for output in outputs:
prompt = output.prompt
generated_text = output.outputs.text
reasoning_text = output.outputs.reasoning_content
</code></pre>
<blockquote>
<p>Note: The <code>generate interface</code> does not currently support passing parameters to control the thinking function (on/off). It always uses the model's default parameters.</p>
</blockquote>
<h2 id="2-api-documentation">2. API Documentation</h2>
<h3 id="21-fastdeployllm">2.1 fastdeploy.LLM</h3>
<p>For <code>LLM</code> configuration, refer to <a href="../parameters/">Parameter Documentation</a>.</p>
<blockquote>
<p>Configuration Notes:</p>
<ol>
<li><code>port</code> and <code>metrics_port</code> is only used for online inference.</li>
<li>After startup, the service logs KV Cache block count (e.g. <code>total_block_num:640</code>). Multiply this by block_size (default 64) to get total cacheable tokens.</li>
<li>Calculate <code>max_num_seqs</code> based on cacheable tokens. Example: avg input=800 tokens, output=500 tokens, blocks=640 → <code>kv_cache_ratio = 800/(800+500)=0.6</code>, <code>max_seq_len = 640*64/(800+500)=31</code>.</li>
</ol>
</blockquote>
<h3 id="22-fastdeployllmchat">2.2 fastdeploy.LLM.chat</h3>
<ul>
<li>messages(list[dict],list[list[dict]]): Input messages (batch supported)</li>
<li>sampling_params: See 2.4 for parameter details</li>
<li>use_tqdm: Enable progress visualization</li>
<li>chat_template_kwargs(dict): Extra template parameters (currently supports enable_thinking(bool))
<em>usage example: <code>chat_template_kwargs={"enable_thinking": False}</code></em></li>
</ul>
<h3 id="23-fastdeployllmgenerate">2.3 fastdeploy.LLM.generate</h3>
<ul>
<li>prompts(str, list[str], list[int], list[list[int]], dict[str, Any], list[dict[str, Any]]): : Input prompts (batch supported), accepts decoded token ids
<em>example of using a dict-type parameter: <code>prompts={"prompt": prompt, "multimodal_data": {"image": images}}</code></em></li>
<li>sampling_params: See 2.4 for parameter details</li>
<li>use_tqdm: Enable progress visualization</li>
</ul>
<h3 id="24-fastdeploysamplingparams">2.4 fastdeploy.SamplingParams</h3>
<ul>
<li>presence_penalty(float): Penalizes repeated topics (positive values reduce repetition)</li>
<li>frequency_penalty(float): Strict penalty for repeated tokens</li>
<li>repetition_penalty(float): Direct penalty for repeated tokens (&gt;1 penalizes, &lt;1 encourages)</li>
<li>temperature(float): Controls randomness (higher = more random)</li>
<li>top_p(float): Probability threshold for token selection</li>
<li>top_k(int): Number of tokens considered for sampling</li>
<li>min_p(float): Minimum probability relative to the maximum probability for a token to be considered (&gt;0 filters low-probability tokens to improve quality)</li>
<li>max_tokens(int): Maximum generated tokens (input + output)</li>
<li>min_tokens(int): Minimum forced generation length</li>
<li>bad_words(list[str]): Prohibited words</li>
</ul>
<h3 id="25-fastdeployenginerequestrequestoutput">2.5 fastdeploy.engine.request.RequestOutput</h3>
<ul>
<li>request_id(str): Request identifier</li>
<li>prompt(str): Input content</li>
<li>prompt_token_ids(list[int]): Tokenized input</li>
<li>outputs(fastdeploy.engine.request.CompletionOutput): Results</li>
<li>finished(bool): Completion status</li>
<li>metrics(fastdeploy.engine.request.RequestMetrics): Performance metrics</li>
<li>num_cached_tokens(int): Cached token count (only valid when enable_prefix_caching``` is enabled)</li>
<li>num_input_image_tokens(int): Number of input image tokens.</li>
<li>num_input_video_tokens(int): Number of input video tokens.</li>
<li>error_code(int): Error code</li>
<li>error_msg(str): Error message</li>
</ul>
<h3 id="26-fastdeployenginerequestcompletionoutput">2.6 fastdeploy.engine.request.CompletionOutput</h3>
<ul>
<li>index(int): Batch index</li>
<li>send_idx(int): Request token index</li>
<li>token_ids(list[int]): Output tokens</li>
<li>text(str): Decoded text</li>
<li>reasoning_content(str): (X1 model only) Chain-of-thought output</li>
</ul>
<h3 id="27-fastdeployenginerequestrequestmetrics">2.7 fastdeploy.engine.request.RequestMetrics</h3>
<ul>
<li>arrival_time(float): Request receipt time</li>
<li>inference_start_time(float): Inference start time</li>
<li>first_token_time(float): First token latency</li>
<li>time_in_queue(float): Queuing time</li>
<li>model_forward_time(float): Forward pass duration</li>
<li>model_execute_time(float): Total execution time (including preprocessing)</li>
</ul>
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