README.md

---
metrics:
- accuracy
pipeline_tag: image-classification
base_model: google/vit-base-patch16-384
model-index:
- name: AdamCodd/vit-base-nsfw-detector
  results:
  - task:
      type: image-classification
      name: Image Classification
    metrics:
    - type: accuracy
      value: 0.9654
      name: Accuracy
    - type: AUC
      value: 0.9948
    - type: loss
      value: 0.0937
      name: Loss
license: apache-2.0
tags:
- transformers.js
- transformers
- nlp
---

# vit-base-nsfw-detector

This model is a fine-tuned version of [vit-base-patch16-384](https://huggingface.co/google/vit-base-patch16-384) on around 25_000 images (drawings, photos...).
It achieves the following results on the evaluation set:
- Loss: 0.0937
- Accuracy: 0.9654

**<u>New [07/30]</u>**: I created a new ViT model specifically to detect NSFW/SFW images for stable diffusion usage (read the disclaimer below for the reason): [**AdamCodd/vit-nsfw-stable-diffusion**](https://huggingface.co/AdamCodd/vit-nsfw-stable-diffusion).

**Disclaimer**: This model wasn't made with generative images in mind! There is no generated image in the dataset used here, and it performs significantly worse on generative images, which will require another ViT model specifically trained on generative images. Here are the model's actual scores for generative images to give you an idea:
- Loss: 0.3682 (↑ 292.95%)
- Accuracy: 0.8600 (↓ 10.91%)
- F1: 0.8654
- AUC: 0.9376 (↓ 5.75%)
- Precision: 0.8350
- Recall: 0.8980

## Model description

The Vision Transformer (ViT) is a transformer encoder model (BERT-like) pretrained on a large collection of images in a supervised fashion, namely ImageNet-21k, at a resolution of 224x224 pixels. Next, the model was fine-tuned on ImageNet (also referred to as ILSVRC2012), a dataset comprising 1 million images and 1,000 classes, at a higher resolution of 384x384.

## Intended uses & limitations

There are two classes: SFW and NSFW. The model has been trained to be restrictive and therefore classify "sexy" images as NSFW. That is, if the image shows cleavage or too much skin, it will be classified as NSFW. This is normal.

Usage for a local image:
```python
from transformers import pipeline
from PIL import Image

img = Image.open("<path_to_image_file>")
predict = pipeline("image-classification", model="AdamCodd/vit-base-nsfw-detector")
predict(img)
```

Usage for a distant image:
```python
from transformers import ViTImageProcessor, AutoModelForImageClassification
from PIL import Image
import requests

url = 'http://images.cocodataset.org/val2017/000000039769.jpg'
image = Image.open(requests.get(url, stream=True).raw)
processor = ViTImageProcessor.from_pretrained('AdamCodd/vit-base-nsfw-detector')
model = AutoModelForImageClassification.from_pretrained('AdamCodd/vit-base-nsfw-detector')
inputs = processor(images=image, return_tensors="pt")
outputs = model(**inputs)
logits = outputs.logits

predicted_class_idx = logits.argmax(-1).item()
print("Predicted class:", model.config.id2label[predicted_class_idx])
# Predicted class: sfw
```

Usage with Transformers.js (Vanilla JS):
```js
/* Instructions:
* - Place this script in an HTML file using the <script type="module"> tag.
* - Ensure the HTML file is served over a local or remote server (e.g., using Python's http.server, Node.js server, or similar).
* - Replace 'https://example.com/path/to/image.jpg' in the classifyImage function call with the URL of the image you want to classify.
*
* Example of how to include this script in HTML:
* <script type="module" src="path/to/this_script.js"></script>
*
* This setup ensures that the script can use imports and perform network requests without CORS issues.
*/
import { pipeline, env } from 'https://cdn.jsdelivr.net/npm/@xenova/[email protected]';

// Since we will download the model from HuggingFace Hub, we can skip the local model check
env.allowLocalModels = false;

// Load the image classification model
const classifier = await pipeline('image-classification', 'AdamCodd/vit-base-nsfw-detector');

// Function to fetch and classify an image from a URL
async function classifyImage(url) {
  try {
    const response = await fetch(url);
    if (!response.ok) throw new Error('Failed to load image');

    const blob = await response.blob();
    const image = new Image();
    const imagePromise = new Promise((resolve, reject) => {
      image.onload = () => resolve(image);
      image.onerror = reject;
      image.src = URL.createObjectURL(blob);
    });

    const img = await imagePromise; // Ensure the image is loaded
    const classificationResults = await classifier([img.src]); // Classify the image
    console.log('Predicted class: ', classificationResults[0].label);
  } catch (error) {
    console.error('Error classifying image:', error);
  }
}

// Example usage
classifyImage('https://example.com/path/to/image.jpg');
// Predicted class: sfw
```


The model has been trained on a variety of images (realistic, 3D, drawings), yet it is not perfect and some images may be wrongly classified as NSFW when they are not. Additionally, please note that using the quantized ONNX model within the transformers.js pipeline will slightly reduce the model's accuracy.
You can find a toy implementation of this model with Transformers.js [here](https://github.com/AdamCodd/media-random-generator).

## Training and evaluation data

More information needed

## Training procedure

### Training hyperparameters

The following hyperparameters were used during training:
- learning_rate: 3e-05
- train_batch_size: 32
- eval_batch_size: 32
- seed: 42
- optimizer: Adam with betas=(0.9,0.999) and epsilon=1e-08
- num_epochs: 1

### Training results

- Validation Loss: 0.0937
- Accuracy: 0.9654, 
- AUC: 0.9948

[Confusion matrix](https://huggingface.co/AdamCodd/vit-base-nsfw-detector/resolve/main/confusion_matrix.png) (eval):

[1076   37]

[  60 1627]

### Framework versions

- Transformers 4.36.2
- Evaluate 0.4.1

If you want to support me, you can [here](https://ko-fi.com/adamcodd).