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---
datasets:
- timm/imagenet-22k-wds
library_name: transformers
license: cc-by-nc-4.0
---
# I-JEPA Model (Giant, fine-tuned on IN22K)
**I-JEPA** is a method for self-supervised learning. At a high level, I-JEPA predicts the representations of part of an image from the representations of other parts of the same image:
1. without relying on pre-specified invariances to hand-crafted data transformations, which tend to be biased for particular downstream tasks,
2. and without having the model fill in pixel-level details, which tend to result in learning less semantically meaningful representations.
## How does it work?
As opposed to generative methods that have a pixel decoder, I-JEPA has a predictor that makes predictions in latent space.
The predictor in I-JEPA can be seen as a primitive (and restricted) world-model that is able to model spatial uncertainty in a static image from a partially observable context.
This world model is semantic in the sense that it predicts high level information about unseen regions in the image, rather than pixel-level details.
We trained a stochastic decoder that maps the I-JEPA predicted representations back in pixel space as sketches.
The model correctly captures positional uncertainty and produces high-level object parts with the correct pose (e.g., dog’s head, wolf’s front legs).
## Intended uses & limitations
I-JEPA can be used for image classification or feature extraction. This checkpoint in specific is intended for **Feature Extraction**.
## How to use
Here is how to use this model for image feature extraction:
```python
import requests
from PIL import Image
from torch.nn.functional import cosine_similarity
from transformers import AutoModel, AutoProcessor
url_1 = "http://images.cocodataset.org/val2017/000000039769.jpg"
url_2 = "http://images.cocodataset.org/val2017/000000219578.jpg"
image_1 = Image.open(requests.get(url_1, stream=True).raw)
image_2 = Image.open(requests.get(url_2, stream=True).raw)
model_id = "jmtzt/ijepa_vitg16_22k"
processor = AutoProcessor.from_pretrained(model_id)
model = AutoModel.from_pretrained(model_id)
def infer(image):
inputs = processor(image, return_tensors="pt")
outputs = model(**inputs)
return outputs.last_hidden_state.mean(dim=1)
embed_1 = infer(image_1)
embed_2 = infer(image_2)
similarity = cosine_similarity(embed_1, embed_2)
print(similarity)
```
### BibTeX entry and citation info
If you use I-JEPA or this code in your work, please cite:
```
@article{assran2023self,
title={Self-Supervised Learning from Images with a Joint-Embedding Predictive Architecture},
author={Assran, Mahmoud and Duval, Quentin and Misra, Ishan and Bojanowski, Piotr and Vincent, Pascal and Rabbat, Michael and LeCun, Yann and Ballas, Nicolas},
journal={arXiv preprint arXiv:2301.08243},
year={2023}
}
``` |