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"""
Hypertile module for splitting attention layers in SD-1.5 U-Net and SD-1.5 VAE
Warn: The patch works well only if the input image has a width and height that are multiples of 128
Original author: @tfernd Github: https://github.com/tfernd/HyperTile
"""
from __future__ import annotations
from dataclasses import dataclass
from typing import Callable
from functools import wraps, cache
import math
import torch.nn as nn
import random
from einops import rearrange
@dataclass
class HypertileParams:
depth = 0
layer_name = ""
tile_size: int = 0
swap_size: int = 0
aspect_ratio: float = 1.0
forward = None
enabled = False
# TODO add SD-XL layers
DEPTH_LAYERS = {
0: [
# SD 1.5 U-Net (diffusers)
"down_blocks.0.attentions.0.transformer_blocks.0.attn1",
"down_blocks.0.attentions.1.transformer_blocks.0.attn1",
"up_blocks.3.attentions.0.transformer_blocks.0.attn1",
"up_blocks.3.attentions.1.transformer_blocks.0.attn1",
"up_blocks.3.attentions.2.transformer_blocks.0.attn1",
# SD 1.5 U-Net (ldm)
"input_blocks.1.1.transformer_blocks.0.attn1",
"input_blocks.2.1.transformer_blocks.0.attn1",
"output_blocks.9.1.transformer_blocks.0.attn1",
"output_blocks.10.1.transformer_blocks.0.attn1",
"output_blocks.11.1.transformer_blocks.0.attn1",
# SD 1.5 VAE
"decoder.mid_block.attentions.0",
"decoder.mid.attn_1",
],
1: [
# SD 1.5 U-Net (diffusers)
"down_blocks.1.attentions.0.transformer_blocks.0.attn1",
"down_blocks.1.attentions.1.transformer_blocks.0.attn1",
"up_blocks.2.attentions.0.transformer_blocks.0.attn1",
"up_blocks.2.attentions.1.transformer_blocks.0.attn1",
"up_blocks.2.attentions.2.transformer_blocks.0.attn1",
# SD 1.5 U-Net (ldm)
"input_blocks.4.1.transformer_blocks.0.attn1",
"input_blocks.5.1.transformer_blocks.0.attn1",
"output_blocks.6.1.transformer_blocks.0.attn1",
"output_blocks.7.1.transformer_blocks.0.attn1",
"output_blocks.8.1.transformer_blocks.0.attn1",
],
2: [
# SD 1.5 U-Net (diffusers)
"down_blocks.2.attentions.0.transformer_blocks.0.attn1",
"down_blocks.2.attentions.1.transformer_blocks.0.attn1",
"up_blocks.1.attentions.0.transformer_blocks.0.attn1",
"up_blocks.1.attentions.1.transformer_blocks.0.attn1",
"up_blocks.1.attentions.2.transformer_blocks.0.attn1",
# SD 1.5 U-Net (ldm)
"input_blocks.7.1.transformer_blocks.0.attn1",
"input_blocks.8.1.transformer_blocks.0.attn1",
"output_blocks.3.1.transformer_blocks.0.attn1",
"output_blocks.4.1.transformer_blocks.0.attn1",
"output_blocks.5.1.transformer_blocks.0.attn1",
],
3: [
# SD 1.5 U-Net (diffusers)
"mid_block.attentions.0.transformer_blocks.0.attn1",
# SD 1.5 U-Net (ldm)
"middle_block.1.transformer_blocks.0.attn1",
],
}
# XL layers, thanks for GitHub@gel-crabs for the help
DEPTH_LAYERS_XL = {
0: [
# SD 1.5 U-Net (diffusers)
"down_blocks.0.attentions.0.transformer_blocks.0.attn1",
"down_blocks.0.attentions.1.transformer_blocks.0.attn1",
"up_blocks.3.attentions.0.transformer_blocks.0.attn1",
"up_blocks.3.attentions.1.transformer_blocks.0.attn1",
"up_blocks.3.attentions.2.transformer_blocks.0.attn1",
# SD 1.5 U-Net (ldm)
"input_blocks.4.1.transformer_blocks.0.attn1",
"input_blocks.5.1.transformer_blocks.0.attn1",
"output_blocks.3.1.transformer_blocks.0.attn1",
"output_blocks.4.1.transformer_blocks.0.attn1",
"output_blocks.5.1.transformer_blocks.0.attn1",
# SD 1.5 VAE
"decoder.mid_block.attentions.0",
"decoder.mid.attn_1",
],
1: [
# SD 1.5 U-Net (diffusers)
#"down_blocks.1.attentions.0.transformer_blocks.0.attn1",
#"down_blocks.1.attentions.1.transformer_blocks.0.attn1",
#"up_blocks.2.attentions.0.transformer_blocks.0.attn1",
#"up_blocks.2.attentions.1.transformer_blocks.0.attn1",
#"up_blocks.2.attentions.2.transformer_blocks.0.attn1",
# SD 1.5 U-Net (ldm)
"input_blocks.4.1.transformer_blocks.1.attn1",
"input_blocks.5.1.transformer_blocks.1.attn1",
"output_blocks.3.1.transformer_blocks.1.attn1",
"output_blocks.4.1.transformer_blocks.1.attn1",
"output_blocks.5.1.transformer_blocks.1.attn1",
"input_blocks.7.1.transformer_blocks.0.attn1",
"input_blocks.8.1.transformer_blocks.0.attn1",
"output_blocks.0.1.transformer_blocks.0.attn1",
"output_blocks.1.1.transformer_blocks.0.attn1",
"output_blocks.2.1.transformer_blocks.0.attn1",
"input_blocks.7.1.transformer_blocks.1.attn1",
"input_blocks.8.1.transformer_blocks.1.attn1",
"output_blocks.0.1.transformer_blocks.1.attn1",
"output_blocks.1.1.transformer_blocks.1.attn1",
"output_blocks.2.1.transformer_blocks.1.attn1",
"input_blocks.7.1.transformer_blocks.2.attn1",
"input_blocks.8.1.transformer_blocks.2.attn1",
"output_blocks.0.1.transformer_blocks.2.attn1",
"output_blocks.1.1.transformer_blocks.2.attn1",
"output_blocks.2.1.transformer_blocks.2.attn1",
"input_blocks.7.1.transformer_blocks.3.attn1",
"input_blocks.8.1.transformer_blocks.3.attn1",
"output_blocks.0.1.transformer_blocks.3.attn1",
"output_blocks.1.1.transformer_blocks.3.attn1",
"output_blocks.2.1.transformer_blocks.3.attn1",
"input_blocks.7.1.transformer_blocks.4.attn1",
"input_blocks.8.1.transformer_blocks.4.attn1",
"output_blocks.0.1.transformer_blocks.4.attn1",
"output_blocks.1.1.transformer_blocks.4.attn1",
"output_blocks.2.1.transformer_blocks.4.attn1",
"input_blocks.7.1.transformer_blocks.5.attn1",
"input_blocks.8.1.transformer_blocks.5.attn1",
"output_blocks.0.1.transformer_blocks.5.attn1",
"output_blocks.1.1.transformer_blocks.5.attn1",
"output_blocks.2.1.transformer_blocks.5.attn1",
"input_blocks.7.1.transformer_blocks.6.attn1",
"input_blocks.8.1.transformer_blocks.6.attn1",
"output_blocks.0.1.transformer_blocks.6.attn1",
"output_blocks.1.1.transformer_blocks.6.attn1",
"output_blocks.2.1.transformer_blocks.6.attn1",
"input_blocks.7.1.transformer_blocks.7.attn1",
"input_blocks.8.1.transformer_blocks.7.attn1",
"output_blocks.0.1.transformer_blocks.7.attn1",
"output_blocks.1.1.transformer_blocks.7.attn1",
"output_blocks.2.1.transformer_blocks.7.attn1",
"input_blocks.7.1.transformer_blocks.8.attn1",
"input_blocks.8.1.transformer_blocks.8.attn1",
"output_blocks.0.1.transformer_blocks.8.attn1",
"output_blocks.1.1.transformer_blocks.8.attn1",
"output_blocks.2.1.transformer_blocks.8.attn1",
"input_blocks.7.1.transformer_blocks.9.attn1",
"input_blocks.8.1.transformer_blocks.9.attn1",
"output_blocks.0.1.transformer_blocks.9.attn1",
"output_blocks.1.1.transformer_blocks.9.attn1",
"output_blocks.2.1.transformer_blocks.9.attn1",
],
2: [
# SD 1.5 U-Net (diffusers)
"mid_block.attentions.0.transformer_blocks.0.attn1",
# SD 1.5 U-Net (ldm)
"middle_block.1.transformer_blocks.0.attn1",
"middle_block.1.transformer_blocks.1.attn1",
"middle_block.1.transformer_blocks.2.attn1",
"middle_block.1.transformer_blocks.3.attn1",
"middle_block.1.transformer_blocks.4.attn1",
"middle_block.1.transformer_blocks.5.attn1",
"middle_block.1.transformer_blocks.6.attn1",
"middle_block.1.transformer_blocks.7.attn1",
"middle_block.1.transformer_blocks.8.attn1",
"middle_block.1.transformer_blocks.9.attn1",
],
3 : [] # TODO - separate layers for SD-XL
}
RNG_INSTANCE = random.Random()
@cache
def get_divisors(value: int, min_value: int, /, max_options: int = 1) -> list[int]:
"""
Returns divisors of value that
x * min_value <= value
in big -> small order, amount of divisors is limited by max_options
"""
max_options = max(1, max_options) # at least 1 option should be returned
min_value = min(min_value, value)
divisors = [i for i in range(min_value, value + 1) if value % i == 0] # divisors in small -> big order
ns = [value // i for i in divisors[:max_options]] # has at least 1 element # big -> small order
return ns
def random_divisor(value: int, min_value: int, /, max_options: int = 1) -> int:
"""
Returns a random divisor of value that
x * min_value <= value
if max_options is 1, the behavior is deterministic
"""
ns = get_divisors(value, min_value, max_options=max_options) # get cached divisors
idx = RNG_INSTANCE.randint(0, len(ns) - 1)
return ns[idx]
def set_hypertile_seed(seed: int) -> None:
RNG_INSTANCE.seed(seed)
@cache
def largest_tile_size_available(width: int, height: int) -> int:
"""
Calculates the largest tile size available for a given width and height
Tile size is always a power of 2
"""
gcd = math.gcd(width, height)
largest_tile_size_available = 1
while gcd % (largest_tile_size_available * 2) == 0:
largest_tile_size_available *= 2
return largest_tile_size_available
def iterative_closest_divisors(hw:int, aspect_ratio:float) -> tuple[int, int]:
"""
Finds h and w such that h*w = hw and h/w = aspect_ratio
We check all possible divisors of hw and return the closest to the aspect ratio
"""
divisors = [i for i in range(2, hw + 1) if hw % i == 0] # all divisors of hw
pairs = [(i, hw // i) for i in divisors] # all pairs of divisors of hw
ratios = [w/h for h, w in pairs] # all ratios of pairs of divisors of hw
closest_ratio = min(ratios, key=lambda x: abs(x - aspect_ratio)) # closest ratio to aspect_ratio
closest_pair = pairs[ratios.index(closest_ratio)] # closest pair of divisors to aspect_ratio
return closest_pair
@cache
def find_hw_candidates(hw:int, aspect_ratio:float) -> tuple[int, int]:
"""
Finds h and w such that h*w = hw and h/w = aspect_ratio
"""
h, w = round(math.sqrt(hw * aspect_ratio)), round(math.sqrt(hw / aspect_ratio))
# find h and w such that h*w = hw and h/w = aspect_ratio
if h * w != hw:
w_candidate = hw / h
# check if w is an integer
if not w_candidate.is_integer():
h_candidate = hw / w
# check if h is an integer
if not h_candidate.is_integer():
return iterative_closest_divisors(hw, aspect_ratio)
else:
h = int(h_candidate)
else:
w = int(w_candidate)
return h, w
def self_attn_forward(params: HypertileParams, scale_depth=True) -> Callable:
@wraps(params.forward)
def wrapper(*args, **kwargs):
if not params.enabled:
return params.forward(*args, **kwargs)
latent_tile_size = max(128, params.tile_size) // 8
x = args[0]
# VAE
if x.ndim == 4:
b, c, h, w = x.shape
nh = random_divisor(h, latent_tile_size, params.swap_size)
nw = random_divisor(w, latent_tile_size, params.swap_size)
if nh * nw > 1:
x = rearrange(x, "b c (nh h) (nw w) -> (b nh nw) c h w", nh=nh, nw=nw) # split into nh * nw tiles
out = params.forward(x, *args[1:], **kwargs)
if nh * nw > 1:
out = rearrange(out, "(b nh nw) c h w -> b c (nh h) (nw w)", nh=nh, nw=nw)
# U-Net
else:
hw: int = x.size(1)
h, w = find_hw_candidates(hw, params.aspect_ratio)
assert h * w == hw, f"Invalid aspect ratio {params.aspect_ratio} for input of shape {x.shape}, hw={hw}, h={h}, w={w}"
factor = 2 ** params.depth if scale_depth else 1
nh = random_divisor(h, latent_tile_size * factor, params.swap_size)
nw = random_divisor(w, latent_tile_size * factor, params.swap_size)
if nh * nw > 1:
x = rearrange(x, "b (nh h nw w) c -> (b nh nw) (h w) c", h=h // nh, w=w // nw, nh=nh, nw=nw)
out = params.forward(x, *args[1:], **kwargs)
if nh * nw > 1:
out = rearrange(out, "(b nh nw) hw c -> b nh nw hw c", nh=nh, nw=nw)
out = rearrange(out, "b nh nw (h w) c -> b (nh h nw w) c", h=h // nh, w=w // nw)
return out
return wrapper
def hypertile_hook_model(model: nn.Module, width, height, *, enable=False, tile_size_max=128, swap_size=1, max_depth=3, is_sdxl=False):
hypertile_layers = getattr(model, "__webui_hypertile_layers", None)
if hypertile_layers is None:
if not enable:
return
hypertile_layers = {}
layers = DEPTH_LAYERS_XL if is_sdxl else DEPTH_LAYERS
for depth in range(4):
for layer_name, module in model.named_modules():
if any(layer_name.endswith(try_name) for try_name in layers[depth]):
params = HypertileParams()
module.__webui_hypertile_params = params
params.forward = module.forward
params.depth = depth
params.layer_name = layer_name
module.forward = self_attn_forward(params)
hypertile_layers[layer_name] = 1
model.__webui_hypertile_layers = hypertile_layers
aspect_ratio = width / height
tile_size = min(largest_tile_size_available(width, height), tile_size_max)
for layer_name, module in model.named_modules():
if layer_name in hypertile_layers:
params = module.__webui_hypertile_params
params.tile_size = tile_size
params.swap_size = swap_size
params.aspect_ratio = aspect_ratio
params.enabled = enable and params.depth <= max_depth
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