193 lines
6.0 KiB
Python
193 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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AI Vision 模块 - CLIP Vision Encoder ONNX 推理
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"""
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import os
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import json
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import time
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import numpy as np
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from PIL import Image
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import onnxruntime as ort
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# ============================================================================
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# 全局模型单例（项目启动时加载一次）
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# ============================================================================
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MODEL_PATH = os.path.join(os.path.dirname(__file__), '..', '..', 'models', 'clip_vision.onnx')
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# 加载选项：CPU 推理，禁用依赖库的启动开销
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_session_options = ort.SessionOptions()
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_session_options.graph_optimization_level = ort.GraphOptimizationLevel.ORT_ENABLE_ALL
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ort_session: ort.InferenceSession = None
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def load_clip_model():
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"""启动时调用：全局加载 CLIP Vision 模型"""
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global ort_session
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if ort_session is not None:
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return ort_session
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if not os.path.exists(MODEL_PATH):
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raise FileNotFoundError(f"CLIP Vision 模型未找到: {MODEL_PATH}")
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ort_session = ort.InferenceSession(MODEL_PATH, sess_options=_session_options, providers=['CPUExecutionProvider'])
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print(f"✅ [AI Vision] CLIP 模型加载成功: {MODEL_PATH}")
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return ort_session
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# ============================================================================
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# CLIP 预处理常量
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# ============================================================================
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# ImageNet 标准归一化（CLIP 官方）
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IMAGENET_MEAN = [0.485, 0.456, 0.406]
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IMAGENET_STD = [0.229, 0.224, 0.225]
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# 模型输入尺寸
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INPUT_SIZE = 224
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def _center_crop_and_resize(image: Image.Image) -> Image.Image:
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"""
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CLIP 官方预处理：中心裁剪抗干扰
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- 将图片最短边缩放到 224
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- 从正中间切取 224x224 区域
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"""
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w, h = image.size
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# 计算缩放后的目标尺寸
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if w < h:
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new_w = INPUT_SIZE
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new_h = int(h * INPUT_SIZE / w)
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else:
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new_h = INPUT_SIZE
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new_w = int(w * INPUT_SIZE / h)
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# 缩放
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image = image.resize((new_w, new_h), Image.BILINEAR)
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# 中心裁剪
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left = (new_w - INPUT_SIZE) // 2
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top = (new_h - INPUT_SIZE) // 2
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right = left + INPUT_SIZE
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bottom = top + INPUT_SIZE
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return image.crop((left, top, right, bottom))
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def _normalize(image_np: np.ndarray) -> np.ndarray:
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"""
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对 224x224x3 图像进行 CLIP 标准归一化
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image_np: shape (H, W, C), dtype uint8, 值域 [0, 255]
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返回: shape (C, H, W), dtype float32, 值域 [0, 1]
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"""
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# HWC -> CHW
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image_np = image_np.transpose(2, 0, 1).astype(np.float32) / 255.0
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# 归一化
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for i, (mean, std) in enumerate(zip(IMAGENET_MEAN, IMAGENET_STD)):
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image_np[i] = (image_np[i] - mean) / std
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return image_np
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# ============================================================================
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# 主函数：提取图像 embedding
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# ============================================================================
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def get_image_embedding(image_path: str) -> list:
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"""
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提取图像的 512 维 CLIP embedding 向量
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参数:
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image_path: 图像文件路径
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返回:
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list: 512 维浮点向量
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"""
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if ort_session is None:
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load_clip_model()
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# 1. 图片预处理
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image = Image.open(image_path).convert('RGB')
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image = _center_crop_and_resize(image)
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input_data = _normalize(np.array(image))
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input_data = np.expand_dims(input_data, axis=0) # [1, 3, 224, 224]
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# 2. 构造占位符输入 (关键修复)
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dummy_ids = np.zeros((1, 77), dtype=np.int64)
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dummy_mask = np.zeros((1, 77), dtype=np.int64)
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# 3. 传入模型进行推理
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# 注意: 模型输入名在你的模型里必须叫 'pixel_values', 'input_ids', 'attention_mask'
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# 如果报错找不到输入名，请打印 ort_session.get_inputs()[0].name 确认
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outputs = ort_session.run(
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['image_embeds'],
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{
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'input_ids': dummy_ids,
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'pixel_values': input_data.astype(np.float32),
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'attention_mask': dummy_mask
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}
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)
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return outputs[0][0].tolist()
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# ============================================================================
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# 通用向量提取工具：防呆、防错
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# ============================================================================
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def extract_and_embed(photo_source):
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if not photo_source:
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return None
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try:
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# 1. 提取基础字符串
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photo_source_str = str(photo_source).strip()
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raw_path = ""
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# 尝试剥掉 JSON 外壳
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try:
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parsed = json.loads(photo_source_str)
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if isinstance(parsed, list):
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raw_path = parsed[0] if parsed else ""
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elif isinstance(parsed, str):
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raw_path = parsed
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else:
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raw_path = str(parsed)
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except:
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raw_path = photo_source_str
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if not raw_path:
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return None
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# 2. 剥离出最纯净的文件名 (只取最后一段)
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pure_filename = raw_path.split('/')[-1]
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# 3. 【终极物理净化】强行抠掉所有多余的标点符号！
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# 哪怕传进来的是 123.jpg"] 或者是 "123.jpg"，全部洗干净
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pure_filename = pure_filename.replace('"', '').replace("'", "").replace('[', '').replace(']', '')
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# 4. 拼接真实的 Docker 物理路径
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file_path = os.path.join('/app/uploads', pure_filename)
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# 5. 加入重试机制 (最多等 3 秒)
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max_retries = 6
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for i in range(max_retries):
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if os.path.exists(file_path):
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# 文件找到了，开始提取向量
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vec = get_image_embedding(file_path)
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if isinstance(vec, np.ndarray):
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return vec.tolist()
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return vec
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else:
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print(f"[AI 识图等待] 第 {i+1} 次尝试，未找到文件 {file_path}，等待 0.5s...")
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time.sleep(0.5)
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print(f"[AI 识图警告] 彻底失败！经过等待依然未找到图片: {file_path}")
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except Exception as e:
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print(f"[AI 识图错误] 实时提取向量失败: {str(e)}")
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return None
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