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UnifiedIO

This repo contains code to run models from our paper Unified-IO: A Unified Model for Vision, Language, and Multi-Modal Tasks.

Installation

Install jax, note this might require manually installing Cuda Toolkits and Cudnn toolkits if using GPUs.

Then install the supporting libraries with:

pip install -r requirements.txt

Model weights

Model weights can be found on aws:

To download run:

wget https://ai2-prior-uio.s3.us-west-2.amazonaws.com/public/model-weights-bin/small_1000k.bin -O small.bin

or download with aws-cli:

aws s3 cp s3://ai2-prior-uio/public/model-weights-bin/small_1000k.bin small.bin

Usage

Download an image to test on:

wget https://farm2.staticflickr.com/1362/1261465554_95741e918b_z.jpg -O dbg_img.png

Then tasks can done using the ModelRunner class:

from uio import runner
from PIL import Image
import numpy as np

model = runner.ModelRunner("small", "small.bin")

with Image.open("dbg_img.png") as img:
  image = np.array(img.convert('RGB'))

# Answer a VQA question, note this might take over a minute the first time it is 
# called while the function is compiled by jax
output = model.vqa(image, "What color is the sofa?")
print(output["text"])  # Should print `green`

This example can be run end-to-end by demo_script.py. ModelRunner supports many more tasks, examples can be seen in the demo notebook.

ModelRunner also provides a lower-level API that can be called with arbitrary text/image output and can generate text/image outputs, as well supporting batch input

out = model.run([image], ["What is the depth map of the image ?"], 
               output_text_len=1, generate_image=True, num_decodes=None)
depth_image = out["image"][0]

Demo notebook

More tasks are shown in demo.ipynb, this requires additionally install jupyter and matplotlib:

pip install matplotlib notebook

Then it can be run with:

jupyter notebook demo.ipynb

Just-in-time compilation

By default ModelRunner compiles the underlying inference calls the first time they are used, this results in faster performance at a one-time cost. This can be disabled by setting the compile parameter to false. You can set the environment variable JAX_LOG_COMPILES=1 to see when a function is being compiled.

Implementation Details

Running UnifiedIO on a task is a 4-step process:

  1. Convert tasks inputs into (image_input, prompt) pairs, the image_input can be None. This step is task-specific and involve things like selecting a prompt for the tasks or converting region locations into region location tokens that are then embedded in the prompt,
  2. Preprocess these components, done by utils.preprocess_image and converting the input prompt into tokens using a T5Tokenizer
  3. Running the model on these pre-processed input, done in model.py. This produces text tokens and/or a 256x256 image as output.
  4. Post-process the results, this step is task-specific and can involve converting the output tokens into text or image locations and/or resizing/cropping the output image.

In ModelRunner, run does steps 2 and 3 and the task-specific methods do steps 1 and 4 for various tasks.

The main neural network code itself can be found in modules.Transformer

Hardware requirements

We have run XL model on GPUs with 24GB of memory, lower memory GPUs should be able to run the smaller models but might not be able to run the XL model.

Citation

If you use this codebase, please cite:

@article{lu2022unified,
  title={Unified-IO: A Unified Model for Vision, Language, and Multi-Modal Tasks},
  author={Lu, Jiasen and Clark, Christopher and Zellers, Rowan and Mottaghi, Roozbeh and Kembhavi, Aniruddha},
  journal={arXiv preprint arXiv:2206.08916},
  year={2022}
}