请给出两个中等量级的Keras模型，专注于图像识别
user
```json
{
  "models": [
    {
      "name": "CNN Model",
      "description": "A simple Convolutional Neural Network (CNN) model for image recognition.",
      "layers": [
        {"type": "Conv2D", "filters": 32, "kernel_size": 3, "activation": "relu"},
        {"type": "MaxPooling2D", "pool_size": 2},
        {"type": "Conv2D", "filters": 64, "kernel_size": 3, "activation": "relu"},
        {"type": "MaxPooling2D", "pool_size": 2},
        {"type": "Flatten"},
        {"type": "Dense", "units": 128, "activation": "relu"},
        {"type": "Dense", "units": 10, "activation": "softmax"}
      ]
    },
    {
      "name": "ResNet50",
      "description": "A pre-trained ResNet50 model for image recognition.",
      "layers": [
        {"type": "ResNet50", "weights": "imagenet", "include_top": false},
        {"type": "GlobalAveragePooling2D"},
        {"type": "Dense", "units": 1024, "activation": "relu"},
        {"type": "Dense", "units": 10, "activation": "softmax"}
      ]
    }
  ]
}
```
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