enginex-mlu370-any2any/transformers/docs/source/en/model_doc/florence2.md

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*This model was released on 2024-06-16 and added to Hugging Face Transformers on 2025-08-20.*

# Florence-2

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## Overview

[Florence-2](https://huggingface.co/papers/2311.06242) is an advanced vision foundation model that uses a prompt-based approach to handle a wide range of vision and vision-language tasks. Florence-2 can interpret simple text prompts to perform tasks like captioning, object detection, and segmentation. It leverages the FLD-5B dataset, containing 5.4 billion annotations across 126 million images, to master multi-task learning. The model's sequence-to-sequence architecture enables it to excel in both zero-shot and fine-tuned settings, proving to be a competitive vision foundation model.

You can find all the original Florence-2 checkpoints under the [Florence-2](https://huggingface.co/models?other=florence-2) collection.

> [!TIP]
> This model was contributed by [ducviet00](https://huggingface.co/ducviet00).
> Click on the Florence-2 models in the right sidebar for more examples of how to apply Florence-2 to different vision and language tasks.

The example below demonstrates how to perform object detection with [`Pipeline`] or the [`AutoModel`] class.

<hfoptions id="usage">
<hfoption id="Pipeline">

```py
import torch
import requests
from PIL import Image
from transformers import pipeline

pipeline = pipeline(
    "image-text-to-text",
    model="florence-community/Florence-2-base",
    device=0,
    dtype=torch.bfloat16
)

pipeline(
    "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/tasks/car.jpg?download=true",
    text="<OD>"
)
```

</hfoption>
<hfoption id="AutoModel">

```py
import torch
import requests
from PIL import Image
from transformers import AutoProcessor, Florence2ForConditionalGeneration

url = "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/tasks/car.jpg?download=true"
image = Image.open(requests.get(url, stream=True).raw).convert("RGB")

model = Florence2ForConditionalGeneration.from_pretrained("microsoft/Florence-2-base", dtype=torch.bfloat16, device_map="auto")
processor = AutoProcessor.from_pretrained("microsoft/Florence-2-base")

task_prompt = "<OD>"
inputs = processor(text=task_prompt, images=image, return_tensors="pt").to(model.device)

generated_ids = model.generate(
    **inputs,
    max_new_tokens=1024,
    num_beams=3,
)
generated_text = processor.batch_decode(generated_ids, skip_special_tokens=False)[0]

image_size = image.size
parsed_answer = processor.post_process_generation(generated_text, task=task_prompt, image_size=image_size)
print(parsed_answer)
```

</hfoption>
</hfoptions>

Quantization reduces the memory burden of large models by representing the weights in a lower precision. Refer to the [Quantization](../quantization/overview) overview for more available quantization backends.

The example below uses [bitsandbytes](../quantization/bitsandbytes) to quantize the model to 4-bit.

```py
# pip install bitsandbytes
import torch
import requests
from PIL import Image
from transformers import AutoProcessor, Florence2ForConditionalGeneration, BitsAndBytesConfig

quantization_config = BitsAndBytesConfig(load_in_4bit=True)

model = Florence2ForConditionalGeneration.from_pretrained(
    "microsoft/Florence-2-large",
    dtype=torch.bfloat16,
    device_map="auto",
    quantization_config=quantization_config
)
processor = AutoProcessor.from_pretrained("microsoft/Florence-2-large")

url = "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/tasks/car.jpg?download=true"
image = Image.open(requests.get(url, stream=True).raw).convert("RGB")

task_prompt = "<OD>"
inputs = processor(text=task_prompt, images=image, return_tensors="pt").to(model.device, torch.bfloat16)

generated_ids = model.generate(
    **inputs,
    max_new_tokens=1024,
    num_beams=3,
)
generated_text = processor.batch_decode(generated_ids, skip_special_tokens=False)[0]

image_size = image.size
parsed_answer = processor.post_process_generation(generated_text, task=task_prompt, image_size=image_size)

print(parsed_answer)
```

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## Notes

- Florence-2 is a prompt-based model. You need to provide a task prompt to tell the model what to do. Supported tasks are:
    - `<OCR>`
    - `<OCR_WITH_REGION>`
    - `<CAPTION>`
    - `<DETAILED_CAPTION>`
    - `<MORE_DETAILED_CAPTION>`
    - `<OD>`
    - `<DENSE_REGION_CAPTION>`
    - `<CAPTION_TO_PHRASE_GROUNDING>`
    - `<REFERRING_EXPRESSION_SEGMENTATION>`
    - `<REGION_TO_SEGMENTATION>`
    - `<OPEN_VOCABULARY_DETECTION>`
    - `<REGION_TO_CATEGORY>`
    - `<REGION_TO_DESCRIPTION>`
    - `<REGION_TO_OCR>`
    - `<REGION_PROPOSAL>`
- The raw output of the model is a string that needs to be parsed. The [`Florence2Processor`] has a [`~Florence2Processor.post_process_generation`] method that can parse the string into a more usable format, like bounding boxes and labels for object detection.

## Resources

- [Florence-2 technical report](https://huggingface.co/papers/2311.06242)
- [Jupyter Notebook for inference and visualization of Florence-2-large model](https://huggingface.co/microsoft/Florence-2-large/blob/main/sample_inference.ipynb)

## Florence2VisionConfig

[[autodoc]] Florence2VisionConfig

## Florence2Config

[[autodoc]] Florence2Config

## Florence2Processor

[[autodoc]] Florence2Processor

## Florence2Model

[[autodoc]] Florence2Model
    - forward

## Florence2ForConditionalGeneration

[[autodoc]] Florence2ForConditionalGeneration
    - forward

## Florence2VisionBackbone

[[autodoc]] Florence2VisionBackbone
    - forward