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Latent diffusions vs DALL-E v2
- 1. Latent diffusions vs DALL-E v2 by Vitaly Bondar johngull @ ODS | gmail
- 4. Latent diffusions High-Resolution Image Synthesis with Latent Diffusion Models Robin Rombach, Andreas Blattmann et al. https://arxiv.org/pdf/2112.10752.pdf https://github.com/CompVis/latent-diffusion https://colab.research.google.com/github/multimodalart/latent-diffusion-notebook/blob/ma in/Latent_Diffusion_LAION_400M_model_text_to_image.ipynb https://huggingface.co/spaces/multimodalart/latentdiffusion
- 6. Latent diffusions: long story short 1. Take “taiming transformers” 2. Replace transformer with the conditional diffusion model 3. PROFIT
- 8. Latent diffusions ● VQGAN used for encoding/decoding ● Generation happens in compact, semantically equal space ● UNet in DM uses inductive bias and scales ● Cross-attention or channels stacking used for conditioning
- 9. Latent diffusions: training 2 training phases: 1. Autoencoder a. Loss: Patch-based GAN loss + Perceptual loss b. Regularization: KL-loss (close to VAE) OR quantization in Decoder (like VQ-GAN) 2. Various generative tasks a. All trainings done on single A100 b. Loss: classical diffusion L2 restoration loss
- 10. Latent diffusions: autoencoder Downsampling for 4-16x: speedup of generative training without sampling quality loss KL-regularization give better autoencoder metrics, but quantization in Decoder version shows better samples quality.
- 13. Latent diffusions: results Without space conditioning
- 16. Latent diffusions: results Text-to-image: a sunset behind a mountain range, vector image
- 18. DALL-E 2 (unClip) Hierarchical Text-Conditional Image Generation with CLIP Latents Aditya Ramesh, Prafulla Dhariwal, Alex Nichol, Casey Chu, Mark Chen https://cdn.openai.com/papers/dall-e-2.pdf https://openai.com/dall-e-2/ P.S: paper is 💩
- 20. DALL-E 2 (unClip) 2 stages (4 in reality ;) ) ● Generate CLIP image embedding from text encoding/image encoding ● Decode image embedding to the image (decoder + 2 stages of diffusion SR)
- 21. DALL-E 2: Decoder Modified GLIDE model (3.5B) convert embedding to the image, then diffusion upsampling 64->256, 256->1024 GLIDE input: CLIP embedding projections, timestamp, 4 context tokens (?) Training: ● Use ¼ of the image ● Set the CLIP embeddings to zero (or a learned embedding) 10% of the time ● dropping the text caption 50% of the time ● For upsampling models add noise to the inputs (1-gaussian, 2-BSR degradations) “Our decoder model provides a unique opportunity to explore CLIP latent space by allowing us to directly visualize what the CLIP image encoder is seeing.”
- 22. DALL-E 2: Decoder “Our decoder model provides a unique opportunity to explore CLIP latent space by allowing us to directly visualize what the CLIP image encoder is seeing.”
- 23. DALL-E 2: Prior model 2 types: ● Autoregressive ○ GPT-like ○ 319 main PCA components from 1024 clip values (quantized to 1024 values) ○ Dot-product of text and image embeddings as input token (0.5 on inference) ● Diffusion model conditioned on input ○ Transformer-based ○ Casual mask for predicted embedding ○ Prompt: encoded text, the CLIP text embedding, an embedding for the diffusion timestep, the noise CLIP image embedding ○ generate two samples and select the one with a higher dot product with z_t.
- 29. Latent diffusions vs DALL-E 2
- 30. Latent diffusions vs DALL-E 2
- 31. Latent diffusions vs DALL-E 2 Latent diffusions ● Good results ● Open-source ● Trained on open dataset ● Quick generation DALL-E 2 ● Amazing results (no independent check) ● No source code ● Proprietary huge dataset ● Unknown speed (probably slow)
- 32. Thank you.