[docs]: Add deepseek-v3.2 run tutorial (#1659)

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# Running DeepSeek V3.2 with SGLang and KT-Kernel
This tutorial demonstrates how to run DeepSeek V3.2 model inference using SGLang integrated with KT-Kernel for CPU-GPU heterogeneous inference. This setup enables efficient deployment of large MoE models by offloading experts to CPU.
## Table of Contents
- [Hardware Requirements](#hardware-requirements)
- [Prerequisites](#prerequisites)
- [Step 1: Download Model Weights](#step-1-download-model-weights)
- [Step 2: Quantize CPU Weights](#step-2-quantize-cpu-weights)
- [Step 3: Launch SGLang Server](#step-3-launch-sglang-server)
- [Step 4: Send Inference Requests](#step-4-send-inference-requests)
## Hardware Requirements
**Minimum Configuration:**
- **GPU**: NVIDIA L20 48GB (or equivalent with at least 27GB VRAM available)
- **CPU**: Intel Xeon with AMX support (e.g., Sapphire Rapids)
- **RAM**: At least 350GB system memory for INT4 quantization
- **Storage**: ~1TB for model weights (FP8 + INT4 quantized)
**Tested Configuration:**
- **GPU**: NVIDIA L20 48GB
- **CPU**: Intel(R) Xeon(R) Platinum 8488C
- **RAM**: 2TB DDR5
- **OS**: Linux (Ubuntu 20.04+ recommended)
## Prerequisites
Before starting, ensure you have:
1. **KT-Kernel installed** - Follow the [installation guide](./kt-kernel_intro.md#installation)
2. **SGLang installed** - Follow [SGLang integration steps](./kt-kernel_intro.md#integration-with-sglang)
3. **CUDA toolkit** - Compatible with your GPU (CUDA 11.8+ recommended)
4. **Hugging Face CLI** - For downloading models:
```bash
pip install huggingface-hub
```
## Step 1: Download Model Weights
DeepSeek V3.2 requires downloading model repositories:
1. **DeepSeek-V3.2**
2. **DeepSeek-V3.2-Speciale**
```bash
# Create a directory for models
mkdir -p /path/to/models
cd /path/to/models
# Download DeepSeek-V3.2 (FP8 weights for GPU)
huggingface-cli download deepseek-ai/DeepSeek-V3.2 \
--local-dir /path/to/deepseek-v3.2
# Download DeepSeek-V3.2-Speciale (if needed)
huggingface-cli download deepseek-ai/DeepSeek-V3.2-Speciale \
--local-dir /path/to/deepseek-v3.2-speciale
```
**Note:** Replace `/path/to/models` with your actual storage path throughout this tutorial.
## Step 2: Quantize CPU Weights
Convert the FP8 GPU weights to INT4 quantized CPU weights using the provided conversion script.
### Conversion Command
For a 2-NUMA system with 60 physical cores:
```bash
cd /path/to/ktransformers/kt-kernel
python scripts/convert_cpu_weights.py \
--input-path /path/to/deepseek-v3.2 \
--input-type fp8 \
--output /path/to/deepseek-v3.2-INT4 \
--quant-method int4 \
--cpuinfer-threads 60 \
--threadpool-count 2 \
--no-merge-safetensor
```
## Step 3: Launch SGLang Server
Start the SGLang server with KT-Kernel integration for CPU-GPU heterogeneous inference.
### Launch Command
For single NVIDIA L20 48GB + 2-NUMA CPU system:
```bash
python -m sglang.launch_server \
--host 0.0.0.0 \
--port 30000 \
--model /path/to/deepseek-v3.2 \
--kt-weight-path /path/to/deepseek-v3.2-INT4 \
--kt-cpuinfer 60 \
--kt-threadpool-count 2 \
--kt-num-gpu-experts 1 \
--attention-backend triton \
--trust-remote-code \
--mem-fraction-static 0.98 \
--chunked-prefill-size 4096 \
--max-running-requests 32 \
--max-total-tokens 40000 \
--served-model-name DeepSeek-V3.2 \
--enable-mixed-chunk \
--tensor-parallel-size 1 \
--enable-p2p-check \
--disable-shared-experts-fusion \
--kt-method AMXINT4
```
### Resource Usage
- **GPU VRAM:** ~27GB (for 1 GPU expert per layer + attention)
- **System RAM:** ~350GB (for INT4 quantized CPU experts)
## Step 4: Send Inference Requests
Once the server is running, you can send inference requests using the OpenAI-compatible API.
### Basic Chat Completion Request
```bash
curl -s http://localhost:30000/v1/chat/completions \
-H "Content-Type: application/json" \
-d '{
"model": "DeepSeek-V3.2",
"stream": false,
"messages": [
{"role": "user", "content": "hi"}
]
}'
```
### Example Response
```json
{
"id": "adbb44f6aafb4b58b167e42fbbb1eed3",
"object": "chat.completion",
"created": 1764675126,
"model": "DeepSeek-V3.2",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hi there! 👋 \n\nThanks for stopping by! How can I help you today? Feel free to ask me anything - I'm here to assist with questions, explanations, conversations, or whatever you need! 😊\n\nIs there something specific on your mind, or would you like to know more about what I can do?",
"reasoning_content": null,
"tool_calls": null
},
"logprobs": null,
"finish_reason": "stop",
"matched_stop": 1
}
],
"usage": {
"prompt_tokens": 5,
"total_tokens": 72,
"completion_tokens": 67,
"prompt_tokens_details": null,
"reasoning_tokens": 0
},
"metadata": {
"weight_version": "default"
}
}
```
## Additional Resources
- [KT-Kernel Documentation](../../../kt-kernel/README.md)
- [DeepSeek V3.2 Model Card](https://huggingface.co/deepseek-ai/DeepSeek-V3.2)
- [SGLang GitHub](https://github.com/sgl-project/sglang)