GitHub - Exceltior/DALLE2-pytorch: Implementation of DALL-E 2, OpenAI's updated text-to-image synthesis neural network, in Pytorch

DALL-E 2 - Pytorch

Implementation of DALL-E 2, OpenAI's updated text-to-image synthesis neural network, in Pytorch.

Yannic Kilcher summary | AssemblyAI explainer

The main novelty seems to be an extra layer of indirection with the prior network (whether it is an autoregressive transformer or a diffusion network), which predicts an image embedding based on the text embedding from CLIP. Specifically, this repository will only build out the diffusion prior network, as it is the best performing variant (but which incidentally involves a causal transformer as the denoising network 😂)

This model is SOTA for text-to-image for now.

Please join if you are interested in helping out with the replication

There was enough interest for a Jax version. I will also eventually extend this to text to video, once the repository is in a good place.

Install

$ pip install dalle2-pytorch

Usage

To train DALLE-2 is a 3 step process, with the training of CLIP being the most important

To train CLIP, you can either use x-clip package, or join the LAION discord, where a lot of replication efforts are already underway.

This repository will demonstrate integration with x-clip for starters

import torch
from dalle2_pytorch import CLIP

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 1,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 1,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8,
    use_all_token_embeds = True,            # whether to use fine-grained contrastive learning (FILIP)
    decoupled_contrastive_learning = True,  # use decoupled contrastive learning (DCL) objective function, removing positive pairs from the denominator of the InfoNCE loss (CLOOB + DCL)
    extra_latent_projection = True,         # whether to use separate projections for text-to-image vs image-to-text comparisons (CLOOB)
    use_visual_ssl = True,                  # whether to do self supervised learning on images
    visual_ssl_type = 'simclr',             # can be either 'simclr' or 'simsiam', depending on using DeCLIP or SLIP
    use_mlm = False,                        # use masked language learning (MLM) on text (DeCLIP)
    text_ssl_loss_weight = 0.05,            # weight for text MLM loss
    image_ssl_loss_weight = 0.05            # weight for image self-supervised learning loss
).cuda()

# mock data

text = torch.randint(0, 49408, (4, 256)).cuda()
images = torch.randn(4, 3, 256, 256).cuda()

# train

loss = clip(
    text,
    images,
    return_loss = True              # needs to be set to True to return contrastive loss
)

loss.backward()

# do the above with as many texts and images as possible in a loop

Then, you will need to train the decoder, which learns to generate images based on the image embedding coming from the trained CLIP above

import torch
from dalle2_pytorch import Unet, Decoder, CLIP

# trained clip from step 1

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 1,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 1,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8
).cuda()

# unet for the decoder

unet = Unet(
    dim = 128,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults=(1, 2, 4, 8)
).cuda()

# decoder, which contains the unet and clip

decoder = Decoder(
    unet = unet,
    clip = clip,
    timesteps = 100,
    image_cond_drop_prob = 0.1,
    text_cond_drop_prob = 0.5
).cuda()

# mock images (get a lot of this)

images = torch.randn(4, 3, 256, 256).cuda()

# feed images into decoder

loss = decoder(images)
loss.backward()

# do the above for many many many many steps
# then it will learn to generate images based on the CLIP image embeddings

Finally, the main contribution of the paper. The repository offers the diffusion prior network. It takes the CLIP text embeddings and tries to generate the CLIP image embeddings. Again, you will need the trained CLIP from the first step

import torch
from dalle2_pytorch import DiffusionPriorNetwork, DiffusionPrior, CLIP

# get trained CLIP from step one

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 6,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 6,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8,
).cuda()

# setup prior network, which contains an autoregressive transformer

prior_network = DiffusionPriorNetwork(
    dim = 512,
    depth = 6,
    dim_head = 64,
    heads = 8
).cuda()

# diffusion prior network, which contains the CLIP and network (with transformer) above

diffusion_prior = DiffusionPrior(
    net = prior_network,
    clip = clip,
    timesteps = 100,
    cond_drop_prob = 0.2
).cuda()

# mock data

text = torch.randint(0, 49408, (4, 256)).cuda()
images = torch.randn(4, 3, 256, 256).cuda()

# feed text and images into diffusion prior network

loss = diffusion_prior(text, images)
loss.backward()

# do the above for many many many steps
# now the diffusion prior can generate image embeddings from the text embeddings

In the paper, they actually used a recently discovered technique, from Jonathan Ho himself (original author of DDPMs, the core technique used in DALL-E v2) for high resolution image synthesis.

This can easily be used within this framework as so

import torch
from dalle2_pytorch import Unet, Decoder, CLIP

# trained clip from step 1

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 6,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 6,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8
).cuda()

# 2 unets for the decoder (a la cascading DDPM)

unet1 = Unet(
    dim = 32,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults = (1, 2, 4, 8)
).cuda()

unet2 = Unet(
    dim = 32,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults = (1, 2, 4, 8, 16)
).cuda()

# decoder, which contains the unet(s) and clip

decoder = Decoder(
    clip = clip,
    unet = (unet1, unet2),            # insert both unets in order of low resolution to highest resolution (you can have as many stages as you want here)
    image_sizes = (256, 512),         # resolutions, 256 for first unet, 512 for second. these must be unique and in ascending order (matches with the unets passed in)
    timesteps = 1000,
    image_cond_drop_prob = 0.1,
    text_cond_drop_prob = 0.5
).cuda()

# mock images (get a lot of this)

images = torch.randn(4, 3, 512, 512).cuda()

# feed images into decoder, specifying which unet you want to train
# each unet can be trained separately, which is one of the benefits of the cascading DDPM scheme

loss = decoder(images, unet_number = 1)
loss.backward()

loss = decoder(images, unet_number = 2)
loss.backward()

# do the above for many steps for both unets

Finally, to generate the DALL-E2 images from text. Insert the trained DiffusionPrior as well as the Decoder (which wraps CLIP, the causal transformer, and unet(s))

from dalle2_pytorch import DALLE2

dalle2 = DALLE2(
    prior = diffusion_prior,
    decoder = decoder
)

# send the text as a string if you want to use the simple tokenizer from DALLE v1
# or you can do it as token ids, if you have your own tokenizer

texts = ['glistening morning dew on a flower petal']
images = dalle2(texts) # (1, 3, 256, 256)

That's it!

Let's see the whole script below

import torch
from dalle2_pytorch import DALLE2, DiffusionPriorNetwork, DiffusionPrior, Unet, Decoder, CLIP

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 6,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 6,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8
).cuda()

# mock data

text = torch.randint(0, 49408, (4, 256)).cuda()
images = torch.randn(4, 3, 256, 256).cuda()

# train

loss = clip(
    text,
    images,
    return_loss = True
)

loss.backward()

# do above for many steps ...

# prior networks (with transformer)

prior_network = DiffusionPriorNetwork(
    dim = 512,
    depth = 6,
    dim_head = 64,
    heads = 8
).cuda()

diffusion_prior = DiffusionPrior(
    net = prior_network,
    clip = clip,
    timesteps = 100,
    cond_drop_prob = 0.2
).cuda()

loss = diffusion_prior(text, images)
loss.backward()

# do above for many steps ...

# decoder (with unet)

unet1 = Unet(
    dim = 128,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults=(1, 2, 4, 8)
).cuda()

unet2 = Unet(
    dim = 16,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults = (1, 2, 4, 8, 16)
).cuda()

decoder = Decoder(
    unet = (unet1, unet2),
    image_sizes = (128, 256),
    clip = clip,
    timesteps = 100,
    image_cond_drop_prob = 0.1,
    text_cond_drop_prob = 0.5,
    condition_on_text_encodings = False  # set this to True if you wish to condition on text during training and sampling
).cuda()

for unet_number in (1, 2):
    loss = decoder(images, unet_number = unet_number) # this can optionally be decoder(images, text) if you wish to condition on the text encodings as well, though it was hinted in the paper it didn't do much
    loss.backward()

# do above for many steps

dalle2 = DALLE2(
    prior = diffusion_prior,
    decoder = decoder
)

images = dalle2(
    ['cute puppy chasing after a squirrel'],
    cond_scale = 2. # classifier free guidance strength (> 1 would strengthen the condition)
)

# save your image (in this example, of size 256x256)

Everything in this readme should run without error

You can also train the decoder on images of greater than the size (say 512x512) at which CLIP was trained (256x256). The images will be resized to CLIP image resolution for the image embeddings

For the layperson, no worries, training will all be automated into a CLI tool, at least for small scale training.

Training on Preprocessed CLIP Embeddings

It is likely, when scaling up, that you would first preprocess your images and text into corresponding embeddings before training the prior network. You can do so easily by simply passing in image_embed, text_embed, and optionally text_encodings and text_mask

Working example below

import torch
from dalle2_pytorch import DiffusionPriorNetwork, DiffusionPrior, CLIP

# get trained CLIP from step one

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 6,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 6,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8,
).cuda()

# setup prior network, which contains an autoregressive transformer

prior_network = DiffusionPriorNetwork(
    dim = 512,
    depth = 6,
    dim_head = 64,
    heads = 8
).cuda()

# diffusion prior network, which contains the CLIP and network (with transformer) above

diffusion_prior = DiffusionPrior(
    net = prior_network,
    clip = clip,
    timesteps = 100,
    cond_drop_prob = 0.2,
    condition_on_text_encodings = False  # this probably should be true, but just to get Laion started
).cuda()

# mock data

text = torch.randint(0, 49408, (4, 256)).cuda()
images = torch.randn(4, 3, 256, 256).cuda()

# precompute the text and image embeddings
# here using the diffusion prior class, but could be done with CLIP alone

clip_image_embeds = diffusion_prior.clip.embed_image(images).image_embed
clip_text_embeds = diffusion_prior.clip.embed_text(text).text_embed

# feed text and images into diffusion prior network

loss = diffusion_prior(
    text_embed = clip_text_embeds,
    image_embed = clip_image_embeds
)

loss.backward()

# do the above for many many many steps
# now the diffusion prior can generate image embeddings from the text embeddings

You can also completely go CLIP-less, in which case you will need to pass in the image_embed_dim into the DiffusionPrior on initialization

import torch
from dalle2_pytorch import DiffusionPriorNetwork, DiffusionPrior

# setup prior network, which contains an autoregressive transformer

prior_network = DiffusionPriorNetwork(
    dim = 512,
    depth = 6,
    dim_head = 64,
    heads = 8
).cuda()

# diffusion prior network, which contains the CLIP and network (with transformer) above

diffusion_prior = DiffusionPrior(
    net = prior_network,
    image_embed_dim = 512,               # this needs to be set
    timesteps = 100,
    cond_drop_prob = 0.2,
    condition_on_text_encodings = False  # this probably should be true, but just to get Laion started
).cuda()

# mock data

text = torch.randint(0, 49408, (4, 256)).cuda()
images = torch.randn(4, 3, 256, 256).cuda()

# precompute the text and image embeddings
# here using the diffusion prior class, but could be done with CLIP alone

clip_image_embeds = torch.randn(4, 512).cuda()
clip_text_embeds = torch.randn(4, 512).cuda()

# feed text and images into diffusion prior network

loss = diffusion_prior(
    text_embed = clip_text_embeds,
    image_embed = clip_image_embeds
)

loss.backward()

# do the above for many many many steps
# now the diffusion prior can generate image embeddings from the text embeddings

OpenAI CLIP

Although there is the possibility they are using an unreleased, more powerful CLIP, you can use one of the released ones, if you do not wish to train your own CLIP from scratch. This will also allow the community to more quickly validate the conclusions of the paper.

To use a pretrained OpenAI CLIP, simply import OpenAIClipAdapter and pass it into the DiffusionPrior or Decoder like so

import torch
from dalle2_pytorch import DALLE2, DiffusionPriorNetwork, DiffusionPrior, Unet, Decoder, OpenAIClipAdapter

# openai pretrained clip - defaults to ViT/B-32

clip = OpenAIClipAdapter()

# mock data

text = torch.randint(0, 49408, (4, 256)).cuda()
images = torch.randn(4, 3, 256, 256).cuda()

# prior networks (with transformer)

prior_network = DiffusionPriorNetwork(
    dim = 512,
    depth = 6,
    dim_head = 64,
    heads = 8
).cuda()

diffusion_prior = DiffusionPrior(
    net = prior_network,
    clip = clip,
    timesteps = 100,
    cond_drop_prob = 0.2
).cuda()

loss = diffusion_prior(text, images)
loss.backward()

# do above for many steps ...

# decoder (with unet)

unet1 = Unet(
    dim = 128,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults=(1, 2, 4, 8)
).cuda()

unet2 = Unet(
    dim = 16,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults = (1, 2, 4, 8, 16)
).cuda()

decoder = Decoder(
    unet = (unet1, unet2),
    image_sizes = (128, 256),
    clip = clip,
    timesteps = 100,
    image_cond_drop_prob = 0.1,
    text_cond_drop_prob = 0.5,
    condition_on_text_encodings = False  # set this to True if you wish to condition on text during training and sampling
).cuda()

for unet_number in (1, 2):
    loss = decoder(images, unet_number = unet_number) # this can optionally be decoder(images, text) if you wish to condition on the text encodings as well, though it was hinted in the paper it didn't do much
    loss.backward()

# do above for many steps

dalle2 = DALLE2(
    prior = diffusion_prior,
    decoder = decoder
)

images = dalle2(
    ['a butterfly trying to escape a tornado'],
    cond_scale = 2. # classifier free guidance strength (> 1 would strengthen the condition)
)

# save your image (in this example, of size 256x256)

Now you'll just have to worry about training the Prior and the Decoder!

Experimental

DALL-E2 with Latent Diffusion

This repository decides to take the next step and offer DALL-E v2 combined with latent diffusion, from Rombach et al.

You can use it as follows. Latent diffusion can be limited to just the first U-Net in the cascade, or to any number you wish.

The repository also comes equipped with all the necessary settings to recreate ViT-VQGan from the Improved VQGans paper. Furthermore, the vector quantization library also comes equipped to do residual or multi-headed quantization, which I believe will give an even further boost in performance to the autoencoder.

import torch
from dalle2_pytorch import Unet, Decoder, CLIP, VQGanVAE

# trained clip from step 1

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 1,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 1,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8
)

# 3 unets for the decoder (a la cascading DDPM)

# first two unets are doing latent diffusion
# vqgan-vae must be trained beforehand

vae1 = VQGanVAE(
    dim = 32,
    image_size = 256,
    layers = 3,
    layer_mults = (1, 2, 4)
)

vae2 = VQGanVAE(
    dim = 32,
    image_size = 512,
    layers = 3,
    layer_mults = (1, 2, 4)
)

unet1 = Unet(
    dim = 32,
    image_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    sparse_attn = True,
    sparse_attn_window = 2,
    dim_mults = (1, 2, 4, 8)
)

unet2 = Unet(
    dim = 32,
    image_embed_dim = 512,
    channels = 3,
    dim_mults = (1, 2, 4, 8, 16),
    cond_on_image_embeds = True,
    cond_on_text_encodings = False
)

unet3 = Unet(
    dim = 32,
    image_embed_dim = 512,
    channels = 3,
    dim_mults = (1, 2, 4, 8, 16),
    cond_on_image_embeds = True,
    cond_on_text_encodings = False,
    attend_at_middle = False
)

# decoder, which contains the unet(s) and clip

decoder = Decoder(
    clip = clip,
    vae = (vae1, vae2),                # latent diffusion for unet1 (vae1) and unet2 (vae2), but not for the last unet3
    unet = (unet1, unet2, unet3),      # insert unets in order of low resolution to highest resolution (you can have as many stages as you want here)
    image_sizes = (256, 512, 1024),    # resolutions, 256 for first unet, 512 for second, 1024 for third
    timesteps = 100,
    image_cond_drop_prob = 0.1,
    text_cond_drop_prob = 0.5
).cuda()

# mock images (get a lot of this)

images = torch.randn(1, 3, 1024, 1024).cuda()

# feed images into decoder, specifying which unet you want to train
# each unet can be trained separately, which is one of the benefits of the cascading DDPM scheme

with decoder.one_unet_in_gpu(1):
    loss = decoder(images, unet_number = 1)
    loss.backward()

with decoder.one_unet_in_gpu(2):
    loss = decoder(images, unet_number = 2)
    loss.backward()

with decoder.one_unet_in_gpu(3):
    loss = decoder(images, unet_number = 3)
    loss.backward()

# do the above for many steps for both unets

# then it will learn to generate images based on the CLIP image embeddings

# chaining the unets from lowest resolution to highest resolution (thus cascading)

mock_image_embed = torch.randn(1, 512).cuda()
images = decoder.sample(mock_image_embed) # (1, 3, 1024, 1024)

Training wrapper (wip)

Decoder Training

Training the Decoder may be confusing, as one needs to keep track of an optimizer for each of the Unet(s) separately. Each Unet will also need its own corresponding exponential moving average. The DecoderTrainer hopes to make this simple, as shown below

import torch
from dalle2_pytorch import DALLE2, Unet, Decoder, CLIP, DecoderTrainer

clip = CLIP(
    dim_text = 512,
    dim_image = 512,
    dim_latent = 512,
    num_text_tokens = 49408,
    text_enc_depth = 6,
    text_seq_len = 256,
    text_heads = 8,
    visual_enc_depth = 6,
    visual_image_size = 256,
    visual_patch_size = 32,
    visual_heads = 8
).cuda()

# mock data

text = torch.randint(0, 49408, (4, 256)).cuda()
images = torch.randn(4, 3, 256, 256).cuda()

# decoder (with unet)

unet1 = Unet(
    dim = 128,
    image_embed_dim = 512,
    text_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults=(1, 2, 4, 8)
).cuda()

unet2 = Unet(
    dim = 16,
    image_embed_dim = 512,
    text_embed_dim = 512,
    cond_dim = 128,
    channels = 3,
    dim_mults = (1, 2, 4, 8, 16),
    cond_on_text_encodings = True
).cuda()

decoder = Decoder(
    unet = (unet1, unet2),
    image_sizes = (128, 256),
    clip = clip,
    timesteps = 1000,
    condition_on_text_encodings = True
).cuda()

decoder_trainer = DecoderTrainer(
    decoder,
    lr = 3e-4,
    wd = 1e-2,
    ema_beta = 0.99,
    ema_update_after_step = 1000,
    ema_update_every = 10,
)

for unet_number in (1, 2):
    loss = decoder_trainer(images, text = text, unet_number = unet_number)  # use the decoder_trainer forward
    loss.backward()

    decoder_trainer.update(unet_number) # update the specific unet as well as its exponential moving average

# after much training
# you can sample from the exponentially moving averaged unets as so

mock_image_embed = torch.randn(4, 512).cuda()
images = decoder_trainer.sample(mock_image_embed, text = text) # (4, 3, 256, 256)

CLI (wip)

$ dream 'sharing a sunset at the summit of mount everest with my dog'

Once built, images will be saved to the same directory the command is invoked

template

Training CLI (wip)

template

Todo

Citations

@misc{ramesh2022,
    title   = {Hierarchical Text-Conditional Image Generation with CLIP Latents}, 
    author  = {Aditya Ramesh et al},
    year    = {2022}
}

@misc{crowson2022,
    author  = {Katherine Crowson},
    url     = {https://twitter.com/rivershavewings}
}

@misc{rombach2021highresolution,
    title   = {High-Resolution Image Synthesis with Latent Diffusion Models}, 
    author  = {Robin Rombach and Andreas Blattmann and Dominik Lorenz and Patrick Esser and Björn Ommer},
    year    = {2021},
    eprint  = {2112.10752},
    archivePrefix = {arXiv},
    primaryClass = {cs.CV}
}

@inproceedings{Liu2022ACF,
    title   = {A ConvNet for the 2020s},
    author  = {Zhuang Liu and Hanzi Mao and Chaozheng Wu and Christoph Feichtenhofer and Trevor Darrell and Saining Xie},
    year    = {2022}
}

@article{shen2019efficient,
    author  = {Zhuoran Shen and Mingyuan Zhang and Haiyu Zhao and Shuai Yi and Hongsheng Li},
    title   = {Efficient Attention: Attention with Linear Complexities},
    journal = {CoRR},
    year    = {2018},
    url     = {http://arxiv.org/abs/1812.01243},
}

@inproceedings{Tu2022MaxViTMV,
    title   = {MaxViT: Multi-Axis Vision Transformer},
    author  = {Zhe-Wei Tu and Hossein Talebi and Han Zhang and Feng Yang and Peyman Milanfar and Alan Conrad Bovik and Yinxiao Li},
    year    = {2022}
}

@article{Yu2021VectorquantizedIM,
    title   = {Vector-quantized Image Modeling with Improved VQGAN},
    author  = {Jiahui Yu and Xin Li and Jing Yu Koh and Han Zhang and Ruoming Pang and James Qin and Alexander Ku and Yuanzhong Xu and Jason Baldridge and Yonghui Wu},
    journal = {ArXiv},
    year    = {2021},
    volume  = {abs/2110.04627}
}

Creating noise from data is easy; creating data from noise is generative modeling. - Yang Song's paper

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DALL-E 2 - Pytorch

Install

Usage

Training on Preprocessed CLIP Embeddings

OpenAI CLIP

Experimental

DALL-E2 with Latent Diffusion

Training wrapper (wip)

Decoder Training

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DALL-E 2 - Pytorch

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Training on Preprocessed CLIP Embeddings

OpenAI CLIP

Experimental

DALL-E2 with Latent Diffusion

Training wrapper (wip)

Decoder Training

CLI (wip)

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