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Salesforce/blip2-opt-2.7b

A Hugging Face model card for BLIP-2, an image-text-to-text model based on OPT-2. 7b, with usage examples, memory requirements, and notes on bias and ethical considerations.

BLIP-2, OPT-2.7b, pre-trained only

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Key points

  • Image-text-to-text model
  • Based on BLIP-2 and OPT-2.7b
  • Tasks listed: image captioning, visual question answering, chat-like conversations

Salesforce / blip2-opt-2.7b like 447 Follow Salesforce AI Research 2.43k

Image-Text-to-Text

arxiv: 2301.12597

License: mit

Model card Files Files and versions xet

Libraries Transformers How to use Salesforce/blip2-opt-2.7b with Transformers: # Use a pipeline as a high-level helper from transformers import pipeline pipe = pipeline("image-text-to-text", model="Salesforce/blip2-opt-2.7b") # Load model directly from transformers import AutoProcessor, AutoModelForMultimodalLM processor = AutoProcessor.from_pretrained("Salesforce/blip2-opt-2.7b") model = AutoModelForMultimodalLM.from_pretrained("Salesforce/blip2-opt-2.7b", device_map="auto") Notebooks Google Colab Kaggle Local Apps Settings vLLM How to use Salesforce/blip2-opt-2.7b with vLLM: Install from pip and serve model # Install vLLM from pip: pip install vllm # Start the vLLM server: vllm serve "Salesforce/blip2-opt-2.7b" # Call the server using curl (OpenAI-compatible API): curl -X POST "http://localhost:8000/v1/completions" \ -H "Content-Type: application/json" \ --data '{ "model": "Salesforce/blip2-opt-2.7b", "prompt": "Once upon a time,", "max_tokens": 512, "temperature": 0.5 }' Use Docker docker model run hf.co/Salesforce/blip2-opt-2.7b SGLang How to use Salesforce/blip2-opt-2.7b with SGLang: Install from pip and serve model # Install SGLang from pip: pip install sglang # Start the SGLang server: python3 -m sglang.launch_server \ --model-path "Salesforce/blip2-opt-2.7b" \ --host 0.0.0.0 \ --port 30000 # Call the server using curl (OpenAI-compatible API): curl -X POST "http://localhost:30000/v1/completions" \ -H "Content-Type: application/json" \ --data '{ "model": "Salesforce/blip2-opt-2.7b", "prompt": "Once upon a time,", "max_tokens": 512, "temperature": 0.5 }' Use Docker images docker run --gpus all \ --shm-size 32g \ -p 30000:30000 \ -v ~/.cache/huggingface:/root/.cache/huggingface \ --env "HF_TOKEN=<secret>" \ --ipc=host \ lmsysorg/sglang:latest \ python3 -m sglang.launch_server \ --model-path "Salesforce/blip2-opt-2.7b" \ --host 0.0.0.0 \ --port 30000 # Call the server using curl (OpenAI-compatible API): curl -X POST "http://localhost:30000/v1/completions" \ -H "Content-Type: application/json" \ --data '{ "model": "Salesforce/blip2-opt-2.7b", "prompt": "Once upon a time,", "max_tokens": 512, "temperature": 0.5 }' Docker Model Runner How to use Salesforce/blip2-opt-2.7b with Docker Model Runner: docker model run hf.co/Salesforce/blip2-opt-2.7b

BLIP-2, OPT-2.7b, pre-trained only

BLIP-2 model, leveraging OPT-2.7b (a large language model with 2.7 billion parameters). It was introduced in the paper BLIP-2: Bootstrapping Language-Image Pre-training with Frozen Image Encoders and Large Language Models by Li et al. and first released in this repository.

Disclaimer: The team releasing BLIP-2 did not write a model card for this model so this model card has been written by the Hugging Face team.

Model description

BLIP-2 consists of 3 models: a CLIP-like image encoder, a Querying Transformer (Q-Former) and a large language model.

The authors initialize the weights of the image encoder and large language model from pre-trained checkpoints and keep them frozen while training the Querying Transformer, which is a BERT-like Transformer encoder that maps a set of "query tokens" to query embeddings, which bridge the gap between the embedding space of the image encoder and the large language model.

The goal for the model is simply to predict the next text token, giving the query embeddings and the previous text.

This allows the model to be used for tasks like:

  • image captioning
  • visual question answering (VQA)
  • chat-like conversations by feeding the image and the previous conversation as prompt to the model

Direct Use and Downstream Use

You can use the raw model for conditional text generation given an image and optional text. See the model hub to look for fine-tuned versions on a task that interests you.

Bias, Risks, Limitations, and Ethical Considerations

BLIP2-OPT uses off-the-shelf OPT as the language model. It inherits the same risks and limitations as mentioned in Meta's model card.

Like other large language models for which the diversity (or lack thereof) of training data induces downstream impact on the quality of our model, OPT-175B has limitations in terms of bias and safety. OPT-175B can also have quality issues in terms of generation diversity and hallucination. In general, OPT-175B is not immune from the plethora of issues that plague modern large language models.

BLIP2 is fine-tuned on image-text datasets (e.g. LAION ) collected from the internet. As a result the model itself is potentially vulnerable to generating equivalently inappropriate content or replicating inherent biases in the underlying data.

BLIP2 has not been tested in real world applications. It should not be directly deployed in any applications. Researchers should first carefully assess the safety and fairness of the model in relation to the specific context they’re being deployed within.

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Memory requirements

  • float32: 14.43 GB total size
  • float16/bfloat16: 7.21 GB total size
  • int8: 3.61 GB total size
  • int4: 1.8 GB total size

Ethical Considerations

This release is for research purposes only in support of an academic paper. Our models, datasets, and code are not specifically designed or evaluated for all downstream purposes. We strongly recommend users evaluate and address potential concerns related to accuracy, safety, and fairness before deploying this model. We encourage users to consider the common limitations of AI, comply with applicable laws, and leverage best practices when selecting use cases, particularly for high-risk scenarios where errors or misuse could significantly impact people’s lives, rights, or safety. For further guidance on use cases, refer to our AUP and AI AUP.

How to use

For code examples, we refer to the documentation.

Memory requirements

The memory requirements differ based on the precision one uses. One can use 4-bit inference using Bitsandbytes, which greatly reduce the memory requirements.

dtypeLargest Layer or Residual GroupTotal SizeTraining using Adam
float32490.94 MB14.43 GB57.72 GB
float16/bfloat16245.47 MB7.21 GB28.86 GB
int8122.73 MB3.61 GB14.43 GB
int461.37 MB1.8 GB7.21 GB

Running the model on CPU

Click to expand

python 
import requests
from PIL import Image
from transformers import Blip2Processor, Blip2ForConditionalGeneration

processor = Blip2Processor.from_pretrained("Salesforce/blip2-opt-2.7b")
model = Blip2ForConditionalGeneration.from_pretrained("Salesforce/blip2-opt-2.7b")

img_url = 'https://storage.googleapis.com/sfr-vision-language-research/BLIP/demo.jpg'
raw_image = Image.open(requests.get(img_url, stream=True).raw).convert('RGB')

question = "how many dogs are in the picture?"
inputs = processor(raw_image, question, return_tensors="pt")

out = model.generate(**inputs)
print(processor.decode(out[0], skip_special_tokens=True).strip())

Running the model on GPU

In full precision

python 
# pip install accelerate
import requests
from PIL import Image
from transformers import Blip2Processor, Blip2ForConditionalGeneration

processor = Blip2Processor.from_pretrained("Salesforce/blip2-opt-2.7b")
model = Blip2ForConditionalGeneration.from_pretrained("Salesforce/blip2-opt-2.7b", device_map="auto")

img_url = 'https://storage.googleapis.com/sfr-vision-language-research/BLIP/demo.jpg'
raw_image = Image.open(requests.get(img_url, stream=True).raw).convert('RGB')

question = "how many dogs are in the picture?"
inputs = processor(raw_image, question, return_tensors="pt").to("cuda")

out = model.generate(**inputs)
print(processor.decode(out[0], skip_special_tokens=True).strip())

In half precision (float16)

python 
# pip install accelerate
import torch
import requests
from PIL import Image
from transformers import Blip2Processor, Blip2ForConditionalGeneration

processor = Blip2Processor.from_pretrained("Salesforce/blip2-opt-2.7b")
model = Blip2ForConditionalGeneration.from_pretrained("Salesforce/blip2-opt-2.7b", torch_dtype=torch.float16, device_map="auto")

img_url = 'https://storage.googleapis.com/sfr-vision-language-research/BLIP/demo.jpg'
raw_image = Image.open(requests.get(img_url, stream=True).raw).convert('RGB')

question = "how many dogs are in the picture?"
inputs = processor(raw_image, question, return_tensors="pt").to("cuda", torch.float16)

out = model.generate(**inputs)
print(processor.decode(out[0], skip_special_tokens=True).strip())

In 8-bit precision (int8)

python 
# pip install accelerate bitsandbytes
import torch
import requests
from PIL import Image
from transformers import Blip2Processor, Blip2ForConditionalGeneration

processor = Blip2Processor.from_pretrained("Salesforce/blip2-opt-2.7b")
model = Blip2ForConditionalGeneration.from_pretrained("Salesforce/blip2-opt-2.7b", load_in_8bit=True, device_map="auto")

img_url = 'https://storage.googleapis.com/sfr-vision-language-research/BLIP/demo.jpg'
raw_image = Image.open(requests.get(img_url, stream=True).raw).convert('RGB')

question = "how many dogs are in the picture?"
inputs = processor(raw_image, question, return_tensors="pt").to("cuda", torch.float16)

out = model.generate(**inputs)
print(processor.decode(out[0], skip_special_tokens=True).strip())
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Model size

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Tensor type

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BLIP2 models

Collection

A collection of all BLIP2 models! • 5 items • Updated Oct 31, 2025 • 21

Paper for Salesforce/blip2-opt-2.7b

BLIP-2: Bootstrapping Language-Image Pre-training with Frozen Image Encoders and Large Language Models

Paper • 2301.12597 • Published Jan 30, 2023 • 3

Salesforce / blip2-opt-2.7b like 447 Follow Salesforce AI Research 2.43k

Model card Files Files and versions xet

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BLIP-2, OPT-2.7b, pre-trained only

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Model description

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Direct Use and Downstream Use

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Bias, Risks, Limitations, and Ethical Considerations

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Ethical Considerations

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Model tree for Salesforce/blip2-opt-2.7b

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Spaces using Salesforce/blip2-opt-2.7b 100

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Collection including Salesforce/blip2-opt-2.7b

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Paper for Salesforce/blip2-opt-2.7b

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Original source

Credits

Original source

Salesforce/blip2-opt-2.7b · Hugging Face

huggingface.co

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