#
Getting Started: VAE Encode with Hybrid Inference

VAE encode is used for training, image-to-image and image-to-video - turning into images or videos into latent representations.

##
Memory

These tables demonstrate the VRAM requirements for VAE encode with SD v1 and SD XL on different GPUs.

For the majority of these GPUs the memory usage % dictates other models (text encoders, UNet/Transformer) must be offloaded, or tiled encoding has to be used which increases time taken and impacts quality.

SD v1.5

GPU | Resolution | Time (seconds) | Memory (%) | Tiled Time (secs) | Tiled Memory (%)
--- | --- | --- | --- | --- | ---
NVIDIA GeForce RTX 4090 | 512x512 | 0.015 | 3.51901 | 0.015 | 3.51901
NVIDIA GeForce RTX 4090 | 256x256 | 0.004 | 1.3154 | 0.005 | 1.3154
NVIDIA GeForce RTX 4090 | 2048x2048 | 0.402 | 47.1852 | 0.496 | 3.51901
NVIDIA GeForce RTX 4090 | 1024x1024 | 0.078 | 12.2658 | 0.094 | 3.51901
NVIDIA GeForce RTX 4080 SUPER | 512x512 | 0.023 | 5.30105 | 0.023 | 5.30105
NVIDIA GeForce RTX 4080 SUPER | 256x256 | 0.006 | 1.98152 | 0.006 | 1.98152
NVIDIA GeForce RTX 4080 SUPER | 2048x2048 | 0.574 | 71.08 | 0.656 | 5.30105
NVIDIA GeForce RTX 4080 SUPER | 1024x1024 | 0.111 | 18.4772 | 0.14 | 5.30105
NVIDIA GeForce RTX 3090 | 512x512 | 0.032 | 3.52782 | 0.032 | 3.52782
NVIDIA GeForce RTX 3090 | 256x256 | 0.01 | 1.31869 | 0.009 | 1.31869
NVIDIA GeForce RTX 3090 | 2048x2048 | 0.742 | 47.3033 | 0.954 | 3.52782
NVIDIA GeForce RTX 3090 | 1024x1024 | 0.136 | 12.2965 | 0.207 | 3.52782
NVIDIA GeForce RTX 3080 | 512x512 | 0.036 | 8.51761 | 0.036 | 8.51761
NVIDIA GeForce RTX 3080 | 256x256 | 0.01 | 3.18387 | 0.01 | 3.18387
NVIDIA GeForce RTX 3080 | 2048x2048 | 0.863 | 86.7424 | 1.191 | 8.51761
NVIDIA GeForce RTX 3080 | 1024x1024 | 0.157 | 29.6888 | 0.227 | 8.51761
NVIDIA GeForce RTX 3070 | 512x512 | 0.051 | 10.6941 | 0.051 | 10.6941
NVIDIA GeForce RTX 3070 | 256x256 | 0.015 | 3.99743 | 0.015 | 3.99743
NVIDIA GeForce RTX 3070 | 2048x2048 | 1.217 | 96.054 | 1.482 | 10.6941
NVIDIA GeForce RTX 3070 | 1024x1024 | 0.223 | 37.2751 | 0.327 | 10.6941

SDXL

GPU | Resolution | Time (seconds) | Memory Consumed (%) | Tiled Time (seconds) | Tiled Memory (%)
--- | --- | --- | --- | --- | ---
NVIDIA GeForce RTX 4090 | 512x512 | 0.029 | 4.95707 | 0.029 | 4.95707
NVIDIA GeForce RTX 4090 | 256x256 | 0.007 | 2.29666 | 0.007 | 2.29666
NVIDIA GeForce RTX 4090 | 2048x2048 | 0.873 | 66.3452 | 0.863 | 15.5649
NVIDIA GeForce RTX 4090 | 1024x1024 | 0.142 | 15.5479 | 0.143 | 15.5479
NVIDIA GeForce RTX 4080 SUPER | 512x512 | 0.044 | 7.46735 | 0.044 | 7.46735
NVIDIA GeForce RTX 4080 SUPER | 256x256 | 0.01 | 3.4597 | 0.01 | 3.4597
NVIDIA GeForce RTX 4080 SUPER | 2048x2048 | 1.317 | 87.1615 | 1.291 | 23.447
NVIDIA GeForce RTX 4080 SUPER | 1024x1024 | 0.213 | 23.4215 | 0.214 | 23.4215
NVIDIA GeForce RTX 3090 | 512x512 | 0.058 | 5.65638 | 0.058 | 5.65638
NVIDIA GeForce RTX 3090 | 256x256 | 0.016 | 2.45081 | 0.016 | 2.45081
NVIDIA GeForce RTX 3090 | 2048x2048 | 1.755 | 77.8239 | 1.614 | 18.4193
NVIDIA GeForce RTX 3090 | 1024x1024 | 0.265 | 18.4023 | 0.265 | 18.4023
NVIDIA GeForce RTX 3080 | 512x512 | 0.064 | 13.6568 | 0.064 | 13.6568
NVIDIA GeForce RTX 3080 | 256x256 | 0.018 | 5.91728 | 0.018 | 5.91728
NVIDIA GeForce RTX 3080 | 2048x2048 | OOM | OOM | 1.866 | 44.4717
NVIDIA GeForce RTX 3080 | 1024x1024 | 0.302 | 44.4308 | 0.302 | 44.4308
NVIDIA GeForce RTX 3070 | 512x512 | 0.093 | 17.1465 | 0.093 | 17.1465
NVIDIA GeForce RTX 3070 | 256x256 | 0.025 | 7.42931 | 0.026 | 7.42931
NVIDIA GeForce RTX 3070 | 2048x2048 | OOM | OOM | 2.674 | 55.8355
NVIDIA GeForce RTX 3070 | 1024x1024 | 0.443 | 55.7841 | 0.443 | 55.7841

##
Available VAEs

| Endpoint | Model
--- | --- | ---
Stable Diffusion v1 | https://qc6479g0aac6qwy9.us-east-1.aws.endpoints.huggingface.cloud | `stabilityai/sd-vae-ft-mse`
Stable Diffusion XL | https://xjqqhmyn62rog84g.us-east-1.aws.endpoints.huggingface.cloud | `madebyollin/sdxl-vae-fp16-fix`
Flux | https://ptccx55jz97f9zgo.us-east-1.aws.endpoints.huggingface.cloud | `black-forest-labs/FLUX.1-schnell`

Model support can be requested here.

##
Code

Install `diffusers` from `main` to run the code: `pip install git+https://github.com/huggingface/diffusers@main`

A helper method simplifies interacting with Hybrid Inference.

    from diffusers.utils.remote_utils import remote_encode

###
Basic example

Let’s encode an image, then decode it to demonstrate.

Code

    from diffusers.utils import load_image
    from diffusers.utils.remote_utils import remote_decode

    image = load_image("https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/astronaut.jpg?download=true")

    latent = remote_encode(
        endpoint="https://ptccx55jz97f9zgo.us-east-1.aws.endpoints.huggingface.cloud/",
        scaling_factor=0.3611,
        shift_factor=0.1159,
    )

    decoded = remote_decode(
        endpoint="https://whhx50ex1aryqvw6.us-east-1.aws.endpoints.huggingface.cloud/",
        tensor=latent,
        scaling_factor=0.3611,
        shift_factor=0.1159,
    )

###
Generation

Now let’s look at a generation example, we’ll encode the image, generate then remotely decode too!

Code

    import torch
    from diffusers import StableDiffusionImg2ImgPipeline
    from diffusers.utils import load_image
    from diffusers.utils.remote_utils import remote_decode, remote_encode

    pipe = StableDiffusionImg2ImgPipeline.from_pretrained(
        "stable-diffusion-v1-5/stable-diffusion-v1-5",
        torch_dtype=torch.float16,
        variant="fp16",
        vae=None,
    ).to("cuda")

    init_image = load_image(
        "https://raw.githubusercontent.com/CompVis/stable-diffusion/main/assets/stable-samples/img2img/sketch-mountains-input.jpg"
    )
    init_image = init_image.resize((768, 512))

    init_latent = remote_encode(
        endpoint="https://qc6479g0aac6qwy9.us-east-1.aws.endpoints.huggingface.cloud/",
        image=init_image,
        scaling_factor=0.18215,
    )

    prompt = "A fantasy landscape, trending on artstation"
    latent = pipe(
        prompt=prompt,
        image=init_latent,
        strength=0.75,
        output_type="latent",
    ).images

    image = remote_decode(
        endpoint="https://q1bj3bpq6kzilnsu.us-east-1.aws.endpoints.huggingface.cloud/",
        tensor=latent,
        scaling_factor=0.18215,
    )
    image.save("fantasy_landscape.jpg")

##
Integrations

- SD.Next: All-in-one UI with direct supports Hybrid Inference.
- ComfyUI-HFRemoteVae: ComfyUI node for Hybrid Inference.

< > Update on GitHub