On-device diffusion plugins for conditioned text-to-image era – Google Analysis Weblog

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Lately, diffusion fashions have proven nice success in text-to-image era, attaining excessive picture high quality, improved inference efficiency, and increasing our inventive inspiration. However, it’s nonetheless difficult to effectively management the era, particularly with circumstances which might be troublesome to explain with textual content.

Immediately, we announce MediaPipe diffusion plugins, which allow controllable text-to-image era to be run on-device. Increasing upon our prior work on GPU inference for on-device giant generative fashions, we introduce new low-cost options for controllable text-to-image era that may be plugged into present diffusion fashions and their Low-Rank Adaptation (LoRA) variants.

Textual content-to-image era with management plugins working on-device.

Background

With diffusion fashions, picture era is modeled as an iterative denoising course of. Ranging from a noise picture, at every step, the diffusion mannequin progressively denoises the picture to disclose a picture of the goal idea. Analysis exhibits that leveraging language understanding through textual content prompts can significantly enhance picture era. For text-to-image era, the textual content embedding is linked to the mannequin through cross-attention layers. But, some data is troublesome to explain by textual content prompts, e.g., the place and pose of an object. To handle this downside, researchers add further fashions into the diffusion to inject management data from a situation picture.

Widespread approaches for managed text-to-image era embody Plug-and-Play, ControlNet, and T2I Adapter. Plug-and-Play applies a extensively used denoising diffusion implicit mannequin (DDIM) inversion method that reverses the era course of ranging from an enter picture to derive an preliminary noise enter, after which employs a replica of the diffusion mannequin (860M parameters for Secure Diffusion 1.5) to encode the situation from an enter picture. Plug-and-Play extracts spatial options with self-attention from the copied diffusion, and injects them into the text-to-image diffusion. ControlNet creates a trainable copy of the encoder of a diffusion mannequin, which connects through a convolution layer with zero-initialized parameters to encode conditioning data that’s conveyed to the decoder layers. Nevertheless, because of this, the scale is giant, half that of the diffusion mannequin (430M parameters for Secure Diffusion 1.5). T2I Adapter is a smaller community (77M parameters) and achieves comparable results in controllable era. T2I Adapter solely takes the situation picture as enter, and its output is shared throughout all diffusion iterations. But, the adapter mannequin will not be designed for moveable gadgets.

The MediaPipe diffusion plugins

To make conditioned era environment friendly, customizable, and scalable, we design the MediaPipe diffusion plugin as a separate community that’s:

  • Plugable: It may be simply linked to a pre-trained base mannequin.
  • Educated from scratch: It doesn’t use pre-trained weights from the bottom mannequin.
  • Moveable: It runs exterior the bottom mannequin on cell gadgets, with negligible price in comparison with the bottom mannequin inference.
Technique    Parameter Dimension     Plugable     From Scratch     Moveable
Plug-and-Play    860M*     ✔️        
ControlNet    430M*     ✔️        
T2I Adapter    77M     ✔️     ✔️    
MediaPipe Plugin    6M     ✔️     ✔️     ✔️
Comparability of Plug-and-Play, ControlNet, T2I Adapter, and the MediaPipe diffusion plugin.
* The quantity varies relying on the particulars of the diffusion mannequin.

The MediaPipe diffusion plugin is a conveyable on-device mannequin for text-to-image era. It extracts multiscale options from a conditioning picture, that are added to the encoder of a diffusion mannequin at corresponding ranges. When connecting to a text-to-image diffusion mannequin, the plugin mannequin can present an additional conditioning sign to the picture era. We design the plugin community to be a light-weight mannequin with solely 6M parameters. It makes use of depth-wise convolutions and inverted bottlenecks from MobileNetv2 for quick inference on cell gadgets.

Overview of the MediaPipe diffusion mannequin plugin. The plugin is a separate community, whose output may be plugged right into a pre-trained text-to-image era mannequin. Options extracted by the plugin are utilized to the related downsampling layer of the diffusion mannequin (blue).

In contrast to ControlNet, we inject the identical management options in all diffusion iterations. That’s, we solely run the plugin as soon as for one picture era, which saves computation. We illustrate some intermediate outcomes of a diffusion course of under. The management is efficient at each diffusion step and allows managed era even at early steps. Extra iterations enhance the alignment of the picture with the textual content immediate and generate extra element.

Illustration of the era course of utilizing the MediaPipe diffusion plugin.

Examples

On this work, we developed plugins for a diffusion-based text-to-image era mannequin with MediaPipe Face Landmark, MediaPipe Holistic Landmark, depth maps, and Canny edge. For every activity, we choose about 100K photos from a web-scale image-text dataset, and compute management indicators utilizing corresponding MediaPipe options. We use refined captions from PaLI for coaching the plugins.

Face Landmark

The MediaPipe Face Landmarker activity computes 478 landmarks (with consideration) of a human face. We use the drawing utils in MediaPipe to render a face, together with face contour, mouth, eyes, eyebrows, and irises, with completely different colours. The next desk exhibits randomly generated samples by conditioning on face mesh and prompts. As a comparability, each ControlNet and Plugin can management text-to-image era with given circumstances.

Face-landmark plugin for text-to-image era, in contrast with ControlNet.

Holistic Landmark

MediaPipe Holistic Landmarker activity contains landmarks of physique pose, arms, and face mesh. Under, we generate numerous stylized photos by conditioning on the holistic options.

Holistic-landmark plugin for text-to-image era.

Depth

Depth-plugin for text-to-image era.

Canny Edge

Canny-edge plugin for text-to-image era.

Analysis

We conduct a quantitative examine of the face landmark plugin to show the mannequin’s efficiency. The analysis dataset incorporates 5K human photos. We evaluate the era high quality as measured by the extensively used metrics, Fréchet Inception Distance (FID) and CLIP scores. The bottom mannequin is a pre-trained text-to-image diffusion mannequin. We use Secure Diffusion v1.5 right here.

As proven within the following desk, each ControlNet and the MediaPipe diffusion plugin produce significantly better pattern high quality than the bottom mannequin, when it comes to FID and CLIP scores. In contrast to ControlNet, which must run at each diffusion step, the MediaPipe plugin solely runs as soon as for every picture generated. We measured the efficiency of the three fashions on a server machine (with Nvidia V100 GPU) and a cell phone (Galaxy S23). On the server, we run all three fashions with 50 diffusion steps, and on cell, we run 20 diffusion steps utilizing the MediaPipe picture era app. In contrast with ControlNet, the MediaPipe plugin exhibits a transparent benefit in inference effectivity whereas preserving the pattern high quality.

Mannequin     FID↓     CLIP↑     Inference Time (s)
Nvidia V100     Galaxy S23
Base     10.32     0.26     5.0     11.5
Base + ControlNet     6.51     0.31     7.4 (+48%)     18.2 (+58.3%)
Base + MediaPipe Plugin     6.50     0.30     5.0 (+0.2%)     11.8 (+2.6%)
Quantitative comparability on FID, CLIP, and inference time.

We check the efficiency of the plugin on a variety of cell gadgets from mid-tier to high-end. We checklist the outcomes on some consultant gadgets within the following desk, overlaying each Android and iOS.

Gadget     Android     iOS
    Pixel 4     Pixel 6     Pixel 7     Galaxy S23     iPhone 12 Professional     iPhone 13 Professional
Time (ms)     128     68     50     48     73     63
Inference time (ms) of the plugin on completely different cell gadgets.

Conclusion

On this work, we current MediaPipe, a conveyable plugin for conditioned text-to-image era. It injects options extracted from a situation picture to a diffusion mannequin, and consequently controls the picture era. Moveable plugins may be linked to pre-trained diffusion fashions working on servers or gadgets. By working text-to-image era and plugins totally on-device, we allow extra versatile purposes of generative AI.

Acknowledgments

We’d prefer to thank all staff members who contributed to this work: Raman Sarokin and Juhyun Lee for the GPU inference resolution; Khanh LeViet, Chuo-Ling Chang, Andrei Kulik, and Matthias Grundmann for management. Particular because of Jiuqiang Tang, Joe Zou and Lu wang, who made this expertise and all of the demos working on-device.

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