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*This model was published in HF papers on 2023-06-16 and contributed to Hugging Face Transformers on 2023-10-13.*

# OWLv2


## Overview

OWLv2 was proposed in [Scaling Open-Vocabulary Object Detection](https://huggingface.co/papers/2306.09683) by Matthias Minderer, Alexey Gritsenko, Neil Houlsby. OWLv2 scales up [OWL-ViT](owlvit) using self-training, which uses an existing detector to generate pseudo-box annotations on image-text pairs. This results in large gains over the previous state-of-the-art for zero-shot object detection.

The abstract from the paper is the following:

*Open-vocabulary object detection has benefited greatly from pretrained vision-language models, but is still limited by the amount of available detection training data. While detection training data can be expanded by using Web image-text pairs as weak supervision, this has not been done at scales comparable to image-level pretraining. Here, we scale up detection data with self-training, which uses an existing detector to generate pseudo-box annotations on image-text pairs. Major challenges in scaling self-training are the choice of label space, pseudo-annotation filtering, and training efficiency. We present the OWLv2 model and OWL-ST self-training recipe, which address these challenges. OWLv2 surpasses the performance of previous state-of-the-art open-vocabulary detectors already at comparable training scales (~10M examples). However, with OWL-ST, we can scale to over 1B examples, yielding further large improvement: With an L/14 architecture, OWL-ST improves AP on LVIS rare classes, for which the model has seen no human box annotations, from 31.2% to 44.6% (43% relative improvement). OWL-ST unlocks Web-scale training for open-world localization, similar to what has been seen for image classification and language modelling.*

<img src="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/model_doc/owlv2_overview.png"
alt="drawing" width="600"/>

<small> OWLv2 high-level overview. Taken from the <a href="https://huggingface.co/papers/2306.09683">original paper</a>. </small>

This model was contributed by [nielsr](https://huggingface.co/nielsr).
The original code can be found [here](https://github.com/google-research/scenic/tree/main/scenic/projects/owl_vit).

## Usage example

OWLv2 is, just like its predecessor [OWL-ViT](owlvit), a zero-shot text-conditioned object detection model. OWL-ViT uses [CLIP](clip) as its multi-modal backbone, with a ViT-like Transformer to get visual features and a causal language model to get the text features. To use CLIP for detection, OWL-ViT removes the final token pooling layer of the vision model and attaches a lightweight classification and box head to each transformer output token. Open-vocabulary classification is enabled by replacing the fixed classification layer weights with the class-name embeddings obtained from the text model. The authors first train CLIP from scratch and fine-tune it end-to-end with the classification and box heads on standard detection datasets using a bipartite matching loss. One or multiple text queries per image can be used to perform zero-shot text-conditioned object detection.

[`Owlv2ImageProcessor`] can be used to resize (or rescale) and normalize images for the model and [`CLIPTokenizer`] is used to encode the text. [`Owlv2Processor`] wraps [`Owlv2ImageProcessor`] and [`CLIPTokenizer`] into a single instance to both encode the text and prepare the images. The following example shows how to perform object detection using [`Owlv2Processor`] and [`Owlv2ForObjectDetection`].

```python
import requests
from PIL import Image
import torch

from transformers import Owlv2Processor, Owlv2ForObjectDetection

processor = Owlv2Processor.from_pretrained("google/owlv2-base-patch16-ensemble")
model = Owlv2ForObjectDetection.from_pretrained("google/owlv2-base-patch16-ensemble", device_map="auto")

url = "http://images.cocodataset.org/val2017/000000039769.jpg"
image = Image.open(requests.get(url, stream=True).raw)
text_labels = [["a photo of a cat", "a photo of a dog"]]
inputs = processor(text=text_labels, images=image, return_tensors="pt").to(model.device)
outputs = model(**inputs)

# Target image sizes (height, width) to rescale box predictions [batch_size, 2]
target_sizes = torch.tensor([(image.height, image.width)])
# Convert outputs (bounding boxes and class logits) to Pascal VOC format (xmin, ymin, xmax, ymax)
results = processor.post_process_grounded_object_detection(
    outputs=outputs, target_sizes=target_sizes, threshold=0.1, text_labels=text_labels
)
# Retrieve predictions for the first image for the corresponding text queries
result = results[0]
boxes, scores, text_labels = result["boxes"], result["scores"], result["text_labels"]
for box, score, text_label in zip(boxes, scores, text_labels):
    box = [round(i, 2) for i in box.tolist()]
    print(f"Detected {text_label} with confidence {round(score.item(), 3)} at location {box}")
Detected a photo of a cat with confidence 0.614 at location [341.67, 23.39, 642.32, 371.35]
Detected a photo of a cat with confidence 0.665 at location [6.75, 51.96, 326.62, 473.13]
```

## Resources

- A demo notebook on using OWLv2 for zero- and one-shot (image-guided) object detection can be found [here](https://github.com/NielsRogge/Transformers-Tutorials/tree/master/OWLv2).
- [Zero-shot object detection task guide](../tasks/zero_shot_object_detection)

<Tip>

The architecture of OWLv2 is identical to [OWL-ViT](owlvit), however the object detection head now also includes an objectness classifier, which predicts the (query-agnostic) likelihood that a predicted box contains an object (as opposed to background). The objectness score can be used to rank or filter predictions independently of text queries.
Usage of OWLv2 is identical to [OWL-ViT](owlvit) with a new, updated image processor ([`Owlv2ImageProcessor`]).

</Tip>

## Owlv2Config

[[autodoc]] Owlv2Config

## Owlv2TextConfig

[[autodoc]] Owlv2TextConfig

## Owlv2VisionConfig

[[autodoc]] Owlv2VisionConfig

## Owlv2ImageProcessor

[[autodoc]] Owlv2ImageProcessor
    - preprocess
    - post_process_object_detection
    - post_process_image_guided_detection

## Owlv2ImageProcessorPil

[[autodoc]] Owlv2ImageProcessorPil
    - preprocess
    - post_process_object_detection
    - post_process_image_guided_detection

## Owlv2Processor

[[autodoc]] Owlv2Processor
    - __call__
    - post_process_grounded_object_detection
    - post_process_image_guided_detection

## Owlv2Model

[[autodoc]] Owlv2Model
    - forward
    - get_text_features
    - get_image_features

## Owlv2TextModel

[[autodoc]] Owlv2TextModel
    - forward

## Owlv2VisionModel

[[autodoc]] Owlv2VisionModel
    - forward

## Owlv2ForObjectDetection

[[autodoc]] Owlv2ForObjectDetection
    - forward
    - image_guided_detection
