---
license: apache-2.0
tags: 
- vision
- image-classification
---

# Kindwise Router Classifier

This model classifies images based on their content, acting as a "router" to
direct requests to the correct Kindwise service.  It automatically detects
whether an image contains human, insect, mushroom, or plant.

Th model is intended to be the first step in an image processing pipeline.
Instead of having each specialized service (e.g., insect, plant classification)
analyze every image, this model quickly determines the image's category. This
reduces latency and optimizes system resources.

## Technical Details and Formats

The model is available in two optimized formats for easy deployment:
- **TorchScript**: Optimized for production environments and server-side applications where performance and low latency are critical.
- **TensorFlow Lite**: Perfect for mobile devices and edge computing, where efficiency and minimal model size are key.

## Usage

Here is how to use this model to classify an image into one of the basic classes:

### PyTorch

```python
from huggingface_hub import hf_hub_download
import cv2
import numpy as np
import PIL.Image
import torch
import torchvision

DEVICE_NAME = 'cuda:0'
MODEL_PATH = hf_hub_download('kindwise/router.small', 'model.traced.pt')
CLASSES_PATH = hf_hub_download('kindwise/router.small', 'classes.txt')
IMAGE_PATH = '/tmp/photo.jpg' 

with open(CLASSES_PATH) as f:
    CLASSES = [line.strip() for line in f]
MODEL = torch.jit.load(MODEL_PATH).eval().to(DEVICE_NAME)


def resize_crop(image_data: np.ndarray, target_size: int = 480) -> np.ndarray | None:
    height, width, _ = image_data.shape
    # Determine the size of the square crop
    crop_size = min(height, width)
    # Calculate coordinates for center crop
    start_x = (width - crop_size) // 2
    start_y = (height - crop_size) // 2
    # Perform center crop
    cropped_img = image_data[
        start_y : start_y + crop_size,
        start_x : start_x + crop_size
    ]
    # Resize cropped image to target size
    return  cv2.resize(
        cropped_img,
        (target_size, target_size),
        interpolation=cv2.INTER_AREA,
    )

with torch.no_grad():
    image_array = np.array(PIL.Image.open(IMAGE_PATH))
    image_array_resized = resize_crop(image_array)
    image_tensor = torchvision.transforms.functional.to_tensor(image_array_resized).to(DEVICE_NAME)
    prediction = MODEL(image_tensor.unsqueeze(0)).squeeze(0).cpu().numpy()
    for i in (-prediction).argsort():
        print(f'{CLASSES[i]:>10}: {100 * prediction[i]:.1f}%')
```

Output:
```
          plant: 91.3%
unhealthy_plant: 53.3%
           crop: 16.2%
         insect: 0.4%
          human: 0.1%
       mushroom: 0.0%
```

###

### TensorFlow Lite

```python
from huggingface_hub import hf_hub_download
import numpy as np
import tensorflow as tf

MODEL_PATH = hf_hub_download('kindwise/router.small', 'model.tflite')  # or model.optimized.tflite
CLASSES_PATH = hf_hub_download('kindwise/router.small', 'classes.txt')

with open(CLASSES_PATH) as f:
    CLASSES = [line.strip() for line in f]
INTERPRETER = tf.lite.Interpreter(model_path=MODEL_PATH)
INTERPRETER.allocate_tensors()

image_array_resized = ... # see the previous example
tf_input = np.expand_dims(  # add batch dimension
    (image_array_resized / 255).astype(np.float32),  # image values in [0..1]
    0,
)
input_details = INTERPRETER.get_input_details()
output_details = INTERPRETER.get_output_details()
INTERPRETER.set_tensor(
    input_details[0]['index'],
    tf_input,
)
INTERPRETER.invoke()
logits = INTERPRETER.get_tensor(output_details[0]['index'])[0]
prediction = tf.nn.sigmoid(logits).numpy()
for i in (-prediction).argsort():
    print(f'{CLASSES[i]:>10}: {100 * prediction[i]:.1f}%')
```

Output:
```
          plant: 91.3%
unhealthy_plant: 53.3%
           crop: 16.2%
         insect: 0.4%
          human: 0.1%
       mushroom: 0.0%
```