Chuyển đến nội dung chính

第 3 課:AI 技術堆疊 — 擴散模型、視覺模型、LLM 和 MLOps

選擇並比較技術堆疊:Stable Diffusion XL 與 FLUX、ControlNet、CLIP、Segment Anything、身體估計模型。使用 MLflow、權重和偏差設定 MLOps 管道。

🧠 人工智慧與機器學習 — 第 2 課 第 3 課:AI 技術堆疊 — 擴散模型, 視覺模型、LLM 和 MLOps

人工智慧在行動:建構時尚和按需印刷的人工智慧平台

第1部分:AI系統架構與平台

亞洲開發網

簡介

在開始編碼之前,您需要為每個模組選擇正確的人工智慧模型和工具。本文將詳細比較這些選項,解釋為什麼選擇模型 X 而不是模型 Y,並設定 MLOps 環境來管理整個生命週期。


1. AI 模型圖 — 哪個模型適用於哪個問題?

┌─────────────────────────────────────────────────────────────┐
│                   Fashion AI Platform — Model Map                │
├──────────────────┬──────────────────────────────────────────┤
│ Module           │ AI Models                                │
├──────────────────┼──────────────────────────────────────────┤
│ Design Gen       │ SDXL / FLUX, ControlNet, IP-Adapter      │
│ Image Analysis   │ CLIP, DINOv2                              │
│ Editing          │ InstructPix2Pix, Instruct-Diffusion      │
│ Typography       │ TextDiffuser, GlyphControl               │
│ Personalization  │ CLIP (embeddings), Rec model              │
│ Size Recommend   │ Custom ML (XGBoost / LightGBM)           │
│ Body Estimation  │ MediaPipe, OpenPose, SMPL-X               │
│ Garment Render   │ Cloth simulation, PyTorch3D               │
│ Auto-Tagging     │ CLIP zero-shot, fine-tuned ViT           │
│ Upscaling        │ Real-ESRGAN, SwinIR                       │
│ Product Copy     │ GPT-4o / Claude API / local LLM           │
│ Content Mod.     │ CLIP + NSFW classifier                    │
└──────────────────┴──────────────────────────────────────────┘

2. 擴散模型 — SDXL、FLUX 與 SD3

###詳細對比

特性標清1.5SDXLSD3通量.1
解析度512x512512x512 1024x10241024x1024 1024x10241024x1024 1024x1024+
架構大學網UNet(大)MMDiT整流流
顯存〜4GB〜6.5GB〜12GB〜12GB
速度快中慢中
品質好很好優秀優秀
文字渲染可憐平均好很好
微調簡單、便宜平均困難平均
控制網成熟成熟早期成長
許可證開啟開啟門控混合

時尚AI平台推薦

Primary:   SDXL + LoRA fine-tuned cho fashion
           → Ecosystem mature, ControlNet đầy đủ, fine-tune dễ

Secondary: FLUX.1 Dev
           → Text rendering tốt hơn (quan trọng cho typography trên áo)

Fallback:  SD 1.5 + LoRA
           → Nhanh, nhẹ, dùng cho preview nhanh

為什麼選擇 SDXL 為 MVP?

  1. 完整的 ControlNet 生態系統 — 服裝感知放置所需
  2. IP 適配器 穩定 — 影像參考所需
  3. LoRA 微調 便宜且快速 — 可以在幾個小時內在 1x A100 上進行訓練 4.豐富的社群模特兒-多種LoRA時尚可供選擇
  4. 擴散器庫 全面支持

3. 視覺模型

CLIP(對比語言-影像預訓練)

# CLIP — backbone cho nhiều module
from transformers import CLIPModel, CLIPProcessor

# Use cases trong Fashion AI Platform:
# 1. Style analysis: Encode ảnh user upload → style vector
# 2. Auto-tagging: Zero-shot classification
# 3. Design search: Semantic similarity
# 4. Content moderation: NSFW detection

model = CLIPModel.from_pretrained("openai/clip-vit-large-patch14-336")
processor = CLIPProcessor.from_pretrained("openai/clip-vit-large-patch14-336")

變體:

型號參數影像尺寸速度準確度
ViT-B/32151M224224快好
ViT-L/14428M224224平均很好
ViT-L/14@336428M336336慢一點優
西格利普878M384384慢最先進的

建議: ViT-L/14@336 — 平衡的準確性/速度,足以進行風格分析和標記。

控制網

ControlNet variants cần cho Fashion AI Platform:

1. controlnet-canny
   → Garment edge detection, layout placement

2. controlnet-depth
   → 3D-aware design placement trên áo

3. controlnet-seg (segmentation)
   → Phân vùng áo: front, back, sleeve

4. controlnet-inpaint
   → Edit vùng cụ thể của design

5. controlnet-pose (OpenPose)
   → Virtual try-on, body-aware rendering

IP 適配器

# IP-Adapter — dùng image reference để guide generation
# Thay vì chỉ dùng text prompt, kết hợp reference image

from diffusers import StableDiffusionXLPipeline
from ip_adapter import IPAdapterXL

# Load IP-Adapter
ip_adapter = IPAdapterXL(
    pipe, "ip-adapter-plus_sdxl_vit-h.safetensors"
)

# Generate với image reference
result = ip_adapter.generate(
    prompt="minimalist streetwear t-shirt design",
    pil_image=reference_image,    # Style reference
    scale=0.6,                     # Influence strength
    num_images=4,                  # 4 variations
)

4. 人體與服裝模型

MediaPipe 姿勢

import mediapipe as mp

# Lightweight, chạy trên CPU
# 33 body landmarks → estimate body proportions
# Phù hợp cho: size recommendation, basic body shape

mp_pose = mp.solutions.pose
pose = mp_pose.Pose(
    static_image_mode=True,
    model_complexity=2,     # 0, 1, or 2
    min_detection_confidence=0.5
)

SMPL-X(虛擬試穿的人體模型)

# SMPL-X — parametric body model
# Input: body shape parameters (β) + pose parameters (θ)
# Output: 3D mesh (10,475 vertices)

import smplx

body_model = smplx.create(
    model_path="models/smplx",
    model_type="smplx",
    gender="neutral",
    num_betas=10,        # Body shape parameters
    num_expression_coeffs=10,
)

# Generate body mesh from measurements
body_params = measurements_to_smplx_params(
    height=172, weight=70,
    chest=95, waist=80, shoulder=45
)
output = body_model(**body_params)
vertices = output.vertices  # (10475, 3)

5. 法學碩士整合

法學碩士在時尚人工智慧平台中的用例

使用案例型號延遲成本
即時增強GPT-4o / 克勞德1–3 秒低
產品標題/描述GPT-4o / 克勞德2–5 秒低
編輯意圖解析GPT-4o-迷你<1sVery low
Style descriptionLocal LLM (Mistral 7B)1–2sFree
Content moderationGPT-4o-mini<1sVery low

Prompt Enhancement Pipeline

ENHANCE_PROMPT = """
You are a fashion design AI assistant for a t-shirt print-on-demand platform.

Given the user's design prompt, enhance it to produce better t-shirt designs:
1. Add specific style details (art style, color palette)
2. Add print-quality keywords (high resolution, vector, clean lines)
3. Keep the core concept intact
4. Add "t-shirt design, isolated on transparent background"

User prompt: {user_prompt}
Enhanced prompt:
"""

6. MLOps Pipeline

Experiment Tracking (MLflow / Weights & Biases)

import mlflow

# Track mỗi lần fine-tune model
with mlflow.start_run(run_name="sdxl-fashion-lora-v2.1"):
    mlflow.log_params({
        "base_model": "stabilityai/sdxl-base-1.0",
        "lora_rank": 32,
        "learning_rate": 1e-4,
        "train_steps": 5000,
        "dataset_size": 10000,
        "resolution": 1024,
    })

    # Train
    model = train_lora(config)

    # Evaluate
    fid_score = evaluate_fid(model, test_set)
    clip_score = evaluate_clip_score(model, test_prompts)
    user_pref = run_human_eval(model, eval_set)

    mlflow.log_metrics({
        "fid_score": fid_score,
        "clip_score": clip_score,
        "user_preference_rate": user_pref,
    })

    # Register model
    mlflow.pytorch.log_model(model, "model")

Model Deployment Pipeline

# CI/CD cho AI models
# .github/workflows/model-deploy.yml

name: Deploy AI Model
on:
  workflow_dispatch:
    inputs:
      model_name:
        description: 'Model to deploy'
        required: true
      model_version:
        description: 'Version to deploy'
        required: true

jobs:
  validate:
    runs-on: gpu-runner
    steps:
      - name: Run quality checks
        run: |
          python scripts/validate_model.py \
            --model ${{ inputs.model_name }} \
            --version ${{ inputs.model_version }} \
            --min-fid 20 \
            --min-clip-score 0.25

  canary:
    needs: validate
    steps:
      - name: Deploy canary (5% traffic)
        run: |
          kubectl set image deployment/$MODEL \
            model=$IMAGE:$VERSION
          kubectl annotate deployment/$MODEL \
            traffic-split="95:current,5:canary"

  promote:
    needs: canary
    steps:
      - name: Monitor for 1 hour
        run: python scripts/monitor_canary.py --duration 3600
      - name: Promote to 100%
        run: |
          kubectl annotate deployment/$MODEL \
            traffic-split="100:new"

7. Development Environment Setup

Requirements

# requirements-ai.txt
torch>=2.2.0
火炬視覺>=0.17.0
擴散器>=0.27.0
變形金剛>=4.40.0
加速>=0.28.0
安全張量>=0.4.0
xformers>=0.0.25
ip 適配器>=1.0.0
controlnet-aux>=0.0.8
媒體管道>=0.10.0
smplx>=0.1.28
修剪網格>=4.0.0
onnxruntime-gpu>=1.17.0
毫升流量>=2.12.0
萬寶>=0.16.0
芹菜>=5.3.0
redis>=5.0.0
fastapi>=0.110.0
枕頭>=10.3.0
opencv-python>=4.9.0
scikit-learn>=1.4.0

Docker Setup cho AI Worker

來自 nvidia/cuda:12.1.1-cudnn8-runtime-ubuntu22.04

#Python環境
運行 apt-get update && apt-get install -y python3.11 python3-pip
複製requirements-ai.txt。
運行 pip install -r requests-ai.txt

# 預先下載模型
運行 python3 -c "
從擴散器導入 StableDiffusionXLPipeline
StableDiffusionXLPipeline.from_pretrained(
    'stabilityai/stable-diffusion-xl-base-1.0',
    cache_dir='/模型'
)
」

複製。 /應用程式
工作目錄/應用程式
CMD [“celery”,“-A”,“工人”,“工人”,“--pool=solo”,“-Q”,“gpu_tasks”]

8. Cost Estimation

GPU 雲端成本(參考)

ProviderGPU$/hourUse case
RunPodA100 80GB$1.64Design generation
LambdaA100 40GB$1.10Fine-tuning
RunPodA10G$0.50Try-on, editing
RunPodT4$0.20Tagging, upscaling
AWSg5.xlarge (A10G)$1.00Production serving

估算營運成本

1000 個設計/天:
├── 設計生成:500 GPU 分鐘 (A100) = ~14 美元/天
├── 編按:200 GPU 分鐘 (A100) = ~$5/天
├── 試試渲染:300 GPU 分鐘 (A10G) = ~$2.5/天
├── 標記與升級:100 GPU 分鐘 (T4) = ~$0.3/天
├── LLM API 呼叫:2000 次呼叫 = ~$2/天
└── 總計:~$24/天 = ~$720/月

總結

時尚人工智慧平台的技術堆疊:

層選擇原因
影像生成SDXL + LoRA生態系統成熟,微調輕鬆
控制ControlNet + IP 轉接器服裝感知放置
願景剪輯 ViT-L/14@336多用途:分析、標記、搜尋
身體MediaPipe + SMPL-X輕量級估算+詳細3D
法學碩士GPT-4o API + Mistral 7B 本地用於生產副本的 API,本地實時
高檔真實-ESRGAN最佳印刷品質
MLOpsMLflow + W&B實驗追蹤+模型註冊
服務海衛一+芹菜多模型服務+非同步

下一篇文章將開始建立第一個人工智慧模組 - 文字到設計,具有針對時尚進行微調的穩定擴散。