shap-e-img2img

Shap-E#

Shap-E introduces a diffusion process that can generate a 3D image from a text prompt. It was introduced in Shap-E: Generating Conditional 3D Implicit Functions by Heewoo Jun and Alex Nichol from OpenAI.

Original repository of Shap-E can be found here: https://github.com/openai/shap-e.

The authors of Shap-E didn't author this model card. They provide a separate model card here.

Introduction#

The abstract of the Shap-E paper:

We present Shap-E, a conditional generative model for 3D assets. Unlike recent work on 3D generative models which produce a single output representation, Shap-E directly generates the parameters of implicit functions that can be rendered as both textured meshes and neural radiance fields. We train Shap-E in two stages: first, we train an encoder that deterministically maps 3D assets into the parameters of an implicit function; second, we train a conditional diffusion model on outputs of the encoder. When trained on a large dataset of paired 3D and text data, our resulting models are capable of generating complex and diverse 3D assets in a matter of seconds. When compared to Point-E, an explicit generative model over point clouds, Shap-E converges faster and reaches comparable or better sample quality despite modeling a higher-dimensional, multi-representation output space. We release model weights, inference code, and samples at this https URL.

Released checkpoints#

The authors released the following checkpoints:

• openai/shap-e: produces a 3D image from a text input prompt
• openai/shap-e-img2img: samples a 3D image from synthetic 2D image

Usage examples in 🧨 diffusers#

First make sure you have installed all the dependencies:

pip install transformers accelerate -q
pip install git+https://github.com/huggingface/diffusers@@shap-ee

Once the dependencies are installed, use the code below:

import torch
from diffusers import ShapEImg2ImgPipeline
from diffusers.utils import export_to_gif, load_image


ckpt_id = "openai/shap-e-img2img"
pipe = ShapEImg2ImgPipeline.from_pretrained(repo).to("cuda")

img_url = "https://hf.co/datasets/diffusers/docs-images/resolve/main/shap-e/corgi.png"
image = load_image(img_url)


generator = torch.Generator(device="cuda").manual_seed(0)
batch_size = 4
guidance_scale = 3.0

images = pipe(
    image, 
    num_images_per_prompt=batch_size, 
    generator=generator, 
    guidance_scale=guidance_scale,
    num_inference_steps=64, 
    size=256, 
    output_type="pil"
).images

gif_path = export_to_gif(images, "corgi_sampled_3d.gif")

Results#

| Image: Reference corgi image in 2D

| Image: Sampled image in 3D (one)

| Image: Sampled image in 3D (two)

| Reference corgi image in 2D | Sampled image in 3D (one) | Sampled image in 3D (two)

Training details#

Refer to the original paper.

Known limitations and potential biases#

Refer to the original model card.

Citation#

@misc{jun2023shape,
      title={Shap-E: Generating Conditional 3D Implicit Functions}, 
      author={Heewoo Jun and Alex Nichol},
      year={2023},
      eprint={2305.02463},
      archivePrefix={arXiv},
      primaryClass={cs.CV}
}