diffusers/docs/source/en/optimization/tgate.md

T-GATE

T-GATE accelerates inference for Stable Diffusion, PixArt, and Latency Consistency Model pipelines by skipping the cross-attention calculation once it converges. This method doesn't require any additional training and it can speed up inference from 10-50%. T-GATE is also compatible with other optimization methods like DeepCache.

Before you begin, make sure you install T-GATE.

pip install tgate
pip install -U torch diffusers transformers accelerate DeepCache

To use T-GATE with a pipeline, you need to use its corresponding loader.

Pipeline	T-GATE Loader
PixArt	TgatePixArtLoader
Stable Diffusion XL	TgateSDXLLoader
Stable Diffusion XL + DeepCache	TgateSDXLDeepCacheLoader
Stable Diffusion	TgateSDLoader
Stable Diffusion + DeepCache	TgateSDDeepCacheLoader

Next, create a TgateLoader with a pipeline, the gate step (the time step to stop calculating the cross attention), and the number of inference steps. Then call the tgate method on the pipeline with a prompt, gate step, and the number of inference steps.

Let's see how to enable this for several different pipelines.

Accelerate PixArtAlphaPipeline with T-GATE:

import torch
from diffusers import PixArtAlphaPipeline
from tgate import TgatePixArtLoader

pipe = PixArtAlphaPipeline.from_pretrained("PixArt-alpha/PixArt-XL-2-1024-MS", torch_dtype=torch.float16)

gate_step = 8
inference_step = 25
pipe = TgatePixArtLoader(
       pipe,
       gate_step=gate_step,
       num_inference_steps=inference_step,
).to("cuda")

image = pipe.tgate(
       "An alpaca made of colorful building blocks, cyberpunk.",
       gate_step=gate_step,
       num_inference_steps=inference_step,
).images[0]

Accelerate StableDiffusionXLPipeline with T-GATE:

import torch
from diffusers import StableDiffusionXLPipeline
from diffusers import DPMSolverMultistepScheduler
from tgate import TgateSDXLLoader

pipe = StableDiffusionXLPipeline.from_pretrained(
            "stabilityai/stable-diffusion-xl-base-1.0",
            torch_dtype=torch.float16,
            variant="fp16",
            use_safetensors=True,
)
pipe.scheduler = DPMSolverMultistepScheduler.from_config(pipe.scheduler.config)

gate_step = 10
inference_step = 25
pipe = TgateSDXLLoader(
       pipe,
       gate_step=gate_step,
       num_inference_steps=inference_step,
).to("cuda")

image = pipe.tgate(
       "Astronaut in a jungle, cold color palette, muted colors, detailed, 8k.",
       gate_step=gate_step,
       num_inference_steps=inference_step
).images[0]

Accelerate StableDiffusionXLPipeline with DeepCache and T-GATE:

import torch
from diffusers import StableDiffusionXLPipeline
from diffusers import DPMSolverMultistepScheduler
from tgate import TgateSDXLDeepCacheLoader

pipe = StableDiffusionXLPipeline.from_pretrained(
            "stabilityai/stable-diffusion-xl-base-1.0",
            torch_dtype=torch.float16,
            variant="fp16",
            use_safetensors=True,
)
pipe.scheduler = DPMSolverMultistepScheduler.from_config(pipe.scheduler.config)

gate_step = 10
inference_step = 25
pipe = TgateSDXLDeepCacheLoader(
       pipe,
       cache_interval=3,
       cache_branch_id=0,
).to("cuda")

image = pipe.tgate(
       "Astronaut in a jungle, cold color palette, muted colors, detailed, 8k.",
       gate_step=gate_step,
       num_inference_steps=inference_step
).images[0]

Accelerate latent-consistency/lcm-sdxl with T-GATE:

import torch
from diffusers import StableDiffusionXLPipeline
from diffusers import UNet2DConditionModel, LCMScheduler
from diffusers import DPMSolverMultistepScheduler
from tgate import TgateSDXLLoader

unet = UNet2DConditionModel.from_pretrained(
    "latent-consistency/lcm-sdxl",
    torch_dtype=torch.float16,
    variant="fp16",
)
pipe = StableDiffusionXLPipeline.from_pretrained(
    "stabilityai/stable-diffusion-xl-base-1.0",
    unet=unet,
    torch_dtype=torch.float16,
    variant="fp16",
)
pipe.scheduler = LCMScheduler.from_config(pipe.scheduler.config)

gate_step = 1
inference_step = 4
pipe = TgateSDXLLoader(
       pipe,
       gate_step=gate_step,
       num_inference_steps=inference_step,
       lcm=True
).to("cuda")

image = pipe.tgate(
       "Astronaut in a jungle, cold color palette, muted colors, detailed, 8k.",
       gate_step=gate_step,
       num_inference_steps=inference_step
).images[0]

T-GATE also supports [StableDiffusionPipeline] and PixArt-alpha/PixArt-LCM-XL-2-1024-MS.

Benchmarks

Model	MACs	Param	Latency	Zero-shot 10K-FID on MS-COCO
SD-1.5	16.938T	859.520M	7.032s	23.927
SD-1.5 w/ T-GATE	9.875T	815.557M	4.313s	20.789
SD-2.1	38.041T	865.785M	16.121s	22.609
SD-2.1 w/ T-GATE	22.208T	815.433 M	9.878s	19.940
SD-XL	149.438T	2.570B	53.187s	24.628
SD-XL w/ T-GATE	84.438T	2.024B	27.932s	22.738
Pixart-Alpha	107.031T	611.350M	61.502s	38.669
Pixart-Alpha w/ T-GATE	65.318T	462.585M	37.867s	35.825
DeepCache (SD-XL)	57.888T	-	19.931s	23.755
DeepCache w/ T-GATE	43.868T	-	14.666s	23.999
LCM (SD-XL)	11.955T	2.570B	3.805s	25.044
LCM w/ T-GATE	11.171T	2.024B	3.533s	25.028
LCM (Pixart-Alpha)	8.563T	611.350M	4.733s	36.086
LCM w/ T-GATE	7.623T	462.585M	4.543s	37.048

The latency is tested on an NVIDIA 1080TI, MACs and Params are calculated with calflops, and the FID is calculated with PytorchFID.