635 lines
22 KiB
Python
635 lines
22 KiB
Python
from __future__ import annotations
|
|
import math
|
|
import psutil
|
|
|
|
import torch
|
|
from torch import einsum
|
|
|
|
from ldm.util import default
|
|
from einops import rearrange
|
|
|
|
from modules import shared, errors, devices, sub_quadratic_attention
|
|
from modules.errors import print_error
|
|
from modules.hypernetworks import hypernetwork
|
|
|
|
import ldm.modules.attention
|
|
import ldm.modules.diffusionmodules.model
|
|
|
|
diffusionmodules_model_AttnBlock_forward = ldm.modules.diffusionmodules.model.AttnBlock.forward
|
|
|
|
|
|
class SdOptimization:
|
|
name: str = None
|
|
label: str | None = None
|
|
cmd_opt: str | None = None
|
|
priority: int = 0
|
|
|
|
def title(self):
|
|
if self.label is None:
|
|
return self.name
|
|
|
|
return f"{self.name} - {self.label}"
|
|
|
|
def is_available(self):
|
|
return True
|
|
|
|
def apply(self):
|
|
pass
|
|
|
|
def undo(self):
|
|
ldm.modules.attention.CrossAttention.forward = hypernetwork.attention_CrossAttention_forward
|
|
ldm.modules.diffusionmodules.model.AttnBlock.forward = diffusionmodules_model_AttnBlock_forward
|
|
|
|
|
|
class SdOptimizationXformers(SdOptimization):
|
|
name = "xformers"
|
|
cmd_opt = "xformers"
|
|
priority = 100
|
|
|
|
def is_available(self):
|
|
return shared.cmd_opts.force_enable_xformers or (shared.xformers_available and torch.version.cuda and (6, 0) <= torch.cuda.get_device_capability(shared.device) <= (9, 0))
|
|
|
|
def apply(self):
|
|
ldm.modules.attention.CrossAttention.forward = xformers_attention_forward
|
|
ldm.modules.diffusionmodules.model.AttnBlock.forward = xformers_attnblock_forward
|
|
|
|
|
|
class SdOptimizationSdpNoMem(SdOptimization):
|
|
name = "sdp-no-mem"
|
|
label = "scaled dot product without memory efficient attention"
|
|
cmd_opt = "opt_sdp_no_mem_attention"
|
|
priority = 90
|
|
|
|
def is_available(self):
|
|
return hasattr(torch.nn.functional, "scaled_dot_product_attention") and callable(torch.nn.functional.scaled_dot_product_attention)
|
|
|
|
def apply(self):
|
|
ldm.modules.attention.CrossAttention.forward = scaled_dot_product_no_mem_attention_forward
|
|
ldm.modules.diffusionmodules.model.AttnBlock.forward = sdp_no_mem_attnblock_forward
|
|
|
|
|
|
class SdOptimizationSdp(SdOptimizationSdpNoMem):
|
|
name = "sdp"
|
|
label = "scaled dot product"
|
|
cmd_opt = "opt_sdp_attention"
|
|
priority = 80
|
|
|
|
def apply(self):
|
|
ldm.modules.attention.CrossAttention.forward = scaled_dot_product_attention_forward
|
|
ldm.modules.diffusionmodules.model.AttnBlock.forward = sdp_attnblock_forward
|
|
|
|
|
|
class SdOptimizationSubQuad(SdOptimization):
|
|
name = "sub-quadratic"
|
|
cmd_opt = "opt_sub_quad_attention"
|
|
priority = 10
|
|
|
|
def apply(self):
|
|
ldm.modules.attention.CrossAttention.forward = sub_quad_attention_forward
|
|
ldm.modules.diffusionmodules.model.AttnBlock.forward = sub_quad_attnblock_forward
|
|
|
|
|
|
class SdOptimizationV1(SdOptimization):
|
|
name = "V1"
|
|
label = "original v1"
|
|
cmd_opt = "opt_split_attention_v1"
|
|
priority = 10
|
|
|
|
|
|
def apply(self):
|
|
ldm.modules.attention.CrossAttention.forward = split_cross_attention_forward_v1
|
|
|
|
|
|
class SdOptimizationInvokeAI(SdOptimization):
|
|
name = "InvokeAI"
|
|
cmd_opt = "opt_split_attention_invokeai"
|
|
|
|
@property
|
|
def priority(self):
|
|
return 1000 if not torch.cuda.is_available() else 10
|
|
|
|
def apply(self):
|
|
ldm.modules.attention.CrossAttention.forward = split_cross_attention_forward_invokeAI
|
|
|
|
|
|
class SdOptimizationDoggettx(SdOptimization):
|
|
name = "Doggettx"
|
|
cmd_opt = "opt_split_attention"
|
|
priority = 20
|
|
|
|
def apply(self):
|
|
ldm.modules.attention.CrossAttention.forward = split_cross_attention_forward
|
|
ldm.modules.diffusionmodules.model.AttnBlock.forward = cross_attention_attnblock_forward
|
|
|
|
|
|
def list_optimizers(res):
|
|
res.extend([
|
|
SdOptimizationXformers(),
|
|
SdOptimizationSdpNoMem(),
|
|
SdOptimizationSdp(),
|
|
SdOptimizationSubQuad(),
|
|
SdOptimizationV1(),
|
|
SdOptimizationInvokeAI(),
|
|
SdOptimizationDoggettx(),
|
|
])
|
|
|
|
|
|
if shared.cmd_opts.xformers or shared.cmd_opts.force_enable_xformers:
|
|
try:
|
|
import xformers.ops
|
|
shared.xformers_available = True
|
|
except Exception:
|
|
print_error("Cannot import xformers", exc_info=True)
|
|
|
|
|
|
def get_available_vram():
|
|
if shared.device.type == 'cuda':
|
|
stats = torch.cuda.memory_stats(shared.device)
|
|
mem_active = stats['active_bytes.all.current']
|
|
mem_reserved = stats['reserved_bytes.all.current']
|
|
mem_free_cuda, _ = torch.cuda.mem_get_info(torch.cuda.current_device())
|
|
mem_free_torch = mem_reserved - mem_active
|
|
mem_free_total = mem_free_cuda + mem_free_torch
|
|
return mem_free_total
|
|
else:
|
|
return psutil.virtual_memory().available
|
|
|
|
|
|
# see https://github.com/basujindal/stable-diffusion/pull/117 for discussion
|
|
def split_cross_attention_forward_v1(self, x, context=None, mask=None):
|
|
h = self.heads
|
|
|
|
q_in = self.to_q(x)
|
|
context = default(context, x)
|
|
|
|
context_k, context_v = hypernetwork.apply_hypernetworks(shared.loaded_hypernetworks, context)
|
|
k_in = self.to_k(context_k)
|
|
v_in = self.to_v(context_v)
|
|
del context, context_k, context_v, x
|
|
|
|
q, k, v = (rearrange(t, 'b n (h d) -> (b h) n d', h=h) for t in (q_in, k_in, v_in))
|
|
del q_in, k_in, v_in
|
|
|
|
dtype = q.dtype
|
|
if shared.opts.upcast_attn:
|
|
q, k, v = q.float(), k.float(), v.float()
|
|
|
|
with devices.without_autocast(disable=not shared.opts.upcast_attn):
|
|
r1 = torch.zeros(q.shape[0], q.shape[1], v.shape[2], device=q.device, dtype=q.dtype)
|
|
for i in range(0, q.shape[0], 2):
|
|
end = i + 2
|
|
s1 = einsum('b i d, b j d -> b i j', q[i:end], k[i:end])
|
|
s1 *= self.scale
|
|
|
|
s2 = s1.softmax(dim=-1)
|
|
del s1
|
|
|
|
r1[i:end] = einsum('b i j, b j d -> b i d', s2, v[i:end])
|
|
del s2
|
|
del q, k, v
|
|
|
|
r1 = r1.to(dtype)
|
|
|
|
r2 = rearrange(r1, '(b h) n d -> b n (h d)', h=h)
|
|
del r1
|
|
|
|
return self.to_out(r2)
|
|
|
|
|
|
# taken from https://github.com/Doggettx/stable-diffusion and modified
|
|
def split_cross_attention_forward(self, x, context=None, mask=None):
|
|
h = self.heads
|
|
|
|
q_in = self.to_q(x)
|
|
context = default(context, x)
|
|
|
|
context_k, context_v = hypernetwork.apply_hypernetworks(shared.loaded_hypernetworks, context)
|
|
k_in = self.to_k(context_k)
|
|
v_in = self.to_v(context_v)
|
|
|
|
dtype = q_in.dtype
|
|
if shared.opts.upcast_attn:
|
|
q_in, k_in, v_in = q_in.float(), k_in.float(), v_in if v_in.device.type == 'mps' else v_in.float()
|
|
|
|
with devices.without_autocast(disable=not shared.opts.upcast_attn):
|
|
k_in = k_in * self.scale
|
|
|
|
del context, x
|
|
|
|
q, k, v = (rearrange(t, 'b n (h d) -> (b h) n d', h=h) for t in (q_in, k_in, v_in))
|
|
del q_in, k_in, v_in
|
|
|
|
r1 = torch.zeros(q.shape[0], q.shape[1], v.shape[2], device=q.device, dtype=q.dtype)
|
|
|
|
mem_free_total = get_available_vram()
|
|
|
|
gb = 1024 ** 3
|
|
tensor_size = q.shape[0] * q.shape[1] * k.shape[1] * q.element_size()
|
|
modifier = 3 if q.element_size() == 2 else 2.5
|
|
mem_required = tensor_size * modifier
|
|
steps = 1
|
|
|
|
if mem_required > mem_free_total:
|
|
steps = 2 ** (math.ceil(math.log(mem_required / mem_free_total, 2)))
|
|
# print(f"Expected tensor size:{tensor_size/gb:0.1f}GB, cuda free:{mem_free_cuda/gb:0.1f}GB "
|
|
# f"torch free:{mem_free_torch/gb:0.1f} total:{mem_free_total/gb:0.1f} steps:{steps}")
|
|
|
|
if steps > 64:
|
|
max_res = math.floor(math.sqrt(math.sqrt(mem_free_total / 2.5)) / 8) * 64
|
|
raise RuntimeError(f'Not enough memory, use lower resolution (max approx. {max_res}x{max_res}). '
|
|
f'Need: {mem_required / 64 / gb:0.1f}GB free, Have:{mem_free_total / gb:0.1f}GB free')
|
|
|
|
slice_size = q.shape[1] // steps if (q.shape[1] % steps) == 0 else q.shape[1]
|
|
for i in range(0, q.shape[1], slice_size):
|
|
end = i + slice_size
|
|
s1 = einsum('b i d, b j d -> b i j', q[:, i:end], k)
|
|
|
|
s2 = s1.softmax(dim=-1, dtype=q.dtype)
|
|
del s1
|
|
|
|
r1[:, i:end] = einsum('b i j, b j d -> b i d', s2, v)
|
|
del s2
|
|
|
|
del q, k, v
|
|
|
|
r1 = r1.to(dtype)
|
|
|
|
r2 = rearrange(r1, '(b h) n d -> b n (h d)', h=h)
|
|
del r1
|
|
|
|
return self.to_out(r2)
|
|
|
|
|
|
# -- Taken from https://github.com/invoke-ai/InvokeAI and modified --
|
|
mem_total_gb = psutil.virtual_memory().total // (1 << 30)
|
|
|
|
def einsum_op_compvis(q, k, v):
|
|
s = einsum('b i d, b j d -> b i j', q, k)
|
|
s = s.softmax(dim=-1, dtype=s.dtype)
|
|
return einsum('b i j, b j d -> b i d', s, v)
|
|
|
|
def einsum_op_slice_0(q, k, v, slice_size):
|
|
r = torch.zeros(q.shape[0], q.shape[1], v.shape[2], device=q.device, dtype=q.dtype)
|
|
for i in range(0, q.shape[0], slice_size):
|
|
end = i + slice_size
|
|
r[i:end] = einsum_op_compvis(q[i:end], k[i:end], v[i:end])
|
|
return r
|
|
|
|
def einsum_op_slice_1(q, k, v, slice_size):
|
|
r = torch.zeros(q.shape[0], q.shape[1], v.shape[2], device=q.device, dtype=q.dtype)
|
|
for i in range(0, q.shape[1], slice_size):
|
|
end = i + slice_size
|
|
r[:, i:end] = einsum_op_compvis(q[:, i:end], k, v)
|
|
return r
|
|
|
|
def einsum_op_mps_v1(q, k, v):
|
|
if q.shape[0] * q.shape[1] <= 2**16: # (512x512) max q.shape[1]: 4096
|
|
return einsum_op_compvis(q, k, v)
|
|
else:
|
|
slice_size = math.floor(2**30 / (q.shape[0] * q.shape[1]))
|
|
if slice_size % 4096 == 0:
|
|
slice_size -= 1
|
|
return einsum_op_slice_1(q, k, v, slice_size)
|
|
|
|
def einsum_op_mps_v2(q, k, v):
|
|
if mem_total_gb > 8 and q.shape[0] * q.shape[1] <= 2**16:
|
|
return einsum_op_compvis(q, k, v)
|
|
else:
|
|
return einsum_op_slice_0(q, k, v, 1)
|
|
|
|
def einsum_op_tensor_mem(q, k, v, max_tensor_mb):
|
|
size_mb = q.shape[0] * q.shape[1] * k.shape[1] * q.element_size() // (1 << 20)
|
|
if size_mb <= max_tensor_mb:
|
|
return einsum_op_compvis(q, k, v)
|
|
div = 1 << int((size_mb - 1) / max_tensor_mb).bit_length()
|
|
if div <= q.shape[0]:
|
|
return einsum_op_slice_0(q, k, v, q.shape[0] // div)
|
|
return einsum_op_slice_1(q, k, v, max(q.shape[1] // div, 1))
|
|
|
|
def einsum_op_cuda(q, k, v):
|
|
stats = torch.cuda.memory_stats(q.device)
|
|
mem_active = stats['active_bytes.all.current']
|
|
mem_reserved = stats['reserved_bytes.all.current']
|
|
mem_free_cuda, _ = torch.cuda.mem_get_info(q.device)
|
|
mem_free_torch = mem_reserved - mem_active
|
|
mem_free_total = mem_free_cuda + mem_free_torch
|
|
# Divide factor of safety as there's copying and fragmentation
|
|
return einsum_op_tensor_mem(q, k, v, mem_free_total / 3.3 / (1 << 20))
|
|
|
|
def einsum_op(q, k, v):
|
|
if q.device.type == 'cuda':
|
|
return einsum_op_cuda(q, k, v)
|
|
|
|
if q.device.type == 'mps':
|
|
if mem_total_gb >= 32 and q.shape[0] % 32 != 0 and q.shape[0] * q.shape[1] < 2**18:
|
|
return einsum_op_mps_v1(q, k, v)
|
|
return einsum_op_mps_v2(q, k, v)
|
|
|
|
# Smaller slices are faster due to L2/L3/SLC caches.
|
|
# Tested on i7 with 8MB L3 cache.
|
|
return einsum_op_tensor_mem(q, k, v, 32)
|
|
|
|
def split_cross_attention_forward_invokeAI(self, x, context=None, mask=None):
|
|
h = self.heads
|
|
|
|
q = self.to_q(x)
|
|
context = default(context, x)
|
|
|
|
context_k, context_v = hypernetwork.apply_hypernetworks(shared.loaded_hypernetworks, context)
|
|
k = self.to_k(context_k)
|
|
v = self.to_v(context_v)
|
|
del context, context_k, context_v, x
|
|
|
|
dtype = q.dtype
|
|
if shared.opts.upcast_attn:
|
|
q, k, v = q.float(), k.float(), v if v.device.type == 'mps' else v.float()
|
|
|
|
with devices.without_autocast(disable=not shared.opts.upcast_attn):
|
|
k = k * self.scale
|
|
|
|
q, k, v = (rearrange(t, 'b n (h d) -> (b h) n d', h=h) for t in (q, k, v))
|
|
r = einsum_op(q, k, v)
|
|
r = r.to(dtype)
|
|
return self.to_out(rearrange(r, '(b h) n d -> b n (h d)', h=h))
|
|
|
|
# -- End of code from https://github.com/invoke-ai/InvokeAI --
|
|
|
|
|
|
# Based on Birch-san's modified implementation of sub-quadratic attention from https://github.com/Birch-san/diffusers/pull/1
|
|
# The sub_quad_attention_forward function is under the MIT License listed under Memory Efficient Attention in the Licenses section of the web UI interface
|
|
def sub_quad_attention_forward(self, x, context=None, mask=None):
|
|
assert mask is None, "attention-mask not currently implemented for SubQuadraticCrossAttnProcessor."
|
|
|
|
h = self.heads
|
|
|
|
q = self.to_q(x)
|
|
context = default(context, x)
|
|
|
|
context_k, context_v = hypernetwork.apply_hypernetworks(shared.loaded_hypernetworks, context)
|
|
k = self.to_k(context_k)
|
|
v = self.to_v(context_v)
|
|
del context, context_k, context_v, x
|
|
|
|
q = q.unflatten(-1, (h, -1)).transpose(1,2).flatten(end_dim=1)
|
|
k = k.unflatten(-1, (h, -1)).transpose(1,2).flatten(end_dim=1)
|
|
v = v.unflatten(-1, (h, -1)).transpose(1,2).flatten(end_dim=1)
|
|
|
|
if q.device.type == 'mps':
|
|
q, k, v = q.contiguous(), k.contiguous(), v.contiguous()
|
|
|
|
dtype = q.dtype
|
|
if shared.opts.upcast_attn:
|
|
q, k = q.float(), k.float()
|
|
|
|
x = sub_quad_attention(q, k, v, q_chunk_size=shared.cmd_opts.sub_quad_q_chunk_size, kv_chunk_size=shared.cmd_opts.sub_quad_kv_chunk_size, chunk_threshold=shared.cmd_opts.sub_quad_chunk_threshold, use_checkpoint=self.training)
|
|
|
|
x = x.to(dtype)
|
|
|
|
x = x.unflatten(0, (-1, h)).transpose(1,2).flatten(start_dim=2)
|
|
|
|
out_proj, dropout = self.to_out
|
|
x = out_proj(x)
|
|
x = dropout(x)
|
|
|
|
return x
|
|
|
|
def sub_quad_attention(q, k, v, q_chunk_size=1024, kv_chunk_size=None, kv_chunk_size_min=None, chunk_threshold=None, use_checkpoint=True):
|
|
bytes_per_token = torch.finfo(q.dtype).bits//8
|
|
batch_x_heads, q_tokens, _ = q.shape
|
|
_, k_tokens, _ = k.shape
|
|
qk_matmul_size_bytes = batch_x_heads * bytes_per_token * q_tokens * k_tokens
|
|
|
|
if chunk_threshold is None:
|
|
chunk_threshold_bytes = int(get_available_vram() * 0.9) if q.device.type == 'mps' else int(get_available_vram() * 0.7)
|
|
elif chunk_threshold == 0:
|
|
chunk_threshold_bytes = None
|
|
else:
|
|
chunk_threshold_bytes = int(0.01 * chunk_threshold * get_available_vram())
|
|
|
|
if kv_chunk_size_min is None and chunk_threshold_bytes is not None:
|
|
kv_chunk_size_min = chunk_threshold_bytes // (batch_x_heads * bytes_per_token * (k.shape[2] + v.shape[2]))
|
|
elif kv_chunk_size_min == 0:
|
|
kv_chunk_size_min = None
|
|
|
|
if chunk_threshold_bytes is not None and qk_matmul_size_bytes <= chunk_threshold_bytes:
|
|
# the big matmul fits into our memory limit; do everything in 1 chunk,
|
|
# i.e. send it down the unchunked fast-path
|
|
kv_chunk_size = k_tokens
|
|
|
|
with devices.without_autocast(disable=q.dtype == v.dtype):
|
|
return sub_quadratic_attention.efficient_dot_product_attention(
|
|
q,
|
|
k,
|
|
v,
|
|
query_chunk_size=q_chunk_size,
|
|
kv_chunk_size=kv_chunk_size,
|
|
kv_chunk_size_min = kv_chunk_size_min,
|
|
use_checkpoint=use_checkpoint,
|
|
)
|
|
|
|
|
|
def get_xformers_flash_attention_op(q, k, v):
|
|
if not shared.cmd_opts.xformers_flash_attention:
|
|
return None
|
|
|
|
try:
|
|
flash_attention_op = xformers.ops.MemoryEfficientAttentionFlashAttentionOp
|
|
fw, bw = flash_attention_op
|
|
if fw.supports(xformers.ops.fmha.Inputs(query=q, key=k, value=v, attn_bias=None)):
|
|
return flash_attention_op
|
|
except Exception as e:
|
|
errors.display_once(e, "enabling flash attention")
|
|
|
|
return None
|
|
|
|
|
|
def xformers_attention_forward(self, x, context=None, mask=None):
|
|
h = self.heads
|
|
q_in = self.to_q(x)
|
|
context = default(context, x)
|
|
|
|
context_k, context_v = hypernetwork.apply_hypernetworks(shared.loaded_hypernetworks, context)
|
|
k_in = self.to_k(context_k)
|
|
v_in = self.to_v(context_v)
|
|
|
|
q, k, v = (rearrange(t, 'b n (h d) -> b n h d', h=h) for t in (q_in, k_in, v_in))
|
|
del q_in, k_in, v_in
|
|
|
|
dtype = q.dtype
|
|
if shared.opts.upcast_attn:
|
|
q, k, v = q.float(), k.float(), v.float()
|
|
|
|
out = xformers.ops.memory_efficient_attention(q, k, v, attn_bias=None, op=get_xformers_flash_attention_op(q, k, v))
|
|
|
|
out = out.to(dtype)
|
|
|
|
out = rearrange(out, 'b n h d -> b n (h d)', h=h)
|
|
return self.to_out(out)
|
|
|
|
# Based on Diffusers usage of scaled dot product attention from https://github.com/huggingface/diffusers/blob/c7da8fd23359a22d0df2741688b5b4f33c26df21/src/diffusers/models/cross_attention.py
|
|
# The scaled_dot_product_attention_forward function contains parts of code under Apache-2.0 license listed under Scaled Dot Product Attention in the Licenses section of the web UI interface
|
|
def scaled_dot_product_attention_forward(self, x, context=None, mask=None):
|
|
batch_size, sequence_length, inner_dim = x.shape
|
|
|
|
if mask is not None:
|
|
mask = self.prepare_attention_mask(mask, sequence_length, batch_size)
|
|
mask = mask.view(batch_size, self.heads, -1, mask.shape[-1])
|
|
|
|
h = self.heads
|
|
q_in = self.to_q(x)
|
|
context = default(context, x)
|
|
|
|
context_k, context_v = hypernetwork.apply_hypernetworks(shared.loaded_hypernetworks, context)
|
|
k_in = self.to_k(context_k)
|
|
v_in = self.to_v(context_v)
|
|
|
|
head_dim = inner_dim // h
|
|
q = q_in.view(batch_size, -1, h, head_dim).transpose(1, 2)
|
|
k = k_in.view(batch_size, -1, h, head_dim).transpose(1, 2)
|
|
v = v_in.view(batch_size, -1, h, head_dim).transpose(1, 2)
|
|
|
|
del q_in, k_in, v_in
|
|
|
|
dtype = q.dtype
|
|
if shared.opts.upcast_attn:
|
|
q, k, v = q.float(), k.float(), v.float()
|
|
|
|
# the output of sdp = (batch, num_heads, seq_len, head_dim)
|
|
hidden_states = torch.nn.functional.scaled_dot_product_attention(
|
|
q, k, v, attn_mask=mask, dropout_p=0.0, is_causal=False
|
|
)
|
|
|
|
hidden_states = hidden_states.transpose(1, 2).reshape(batch_size, -1, h * head_dim)
|
|
hidden_states = hidden_states.to(dtype)
|
|
|
|
# linear proj
|
|
hidden_states = self.to_out[0](hidden_states)
|
|
# dropout
|
|
hidden_states = self.to_out[1](hidden_states)
|
|
return hidden_states
|
|
|
|
def scaled_dot_product_no_mem_attention_forward(self, x, context=None, mask=None):
|
|
with torch.backends.cuda.sdp_kernel(enable_flash=True, enable_math=True, enable_mem_efficient=False):
|
|
return scaled_dot_product_attention_forward(self, x, context, mask)
|
|
|
|
def cross_attention_attnblock_forward(self, x):
|
|
h_ = x
|
|
h_ = self.norm(h_)
|
|
q1 = self.q(h_)
|
|
k1 = self.k(h_)
|
|
v = self.v(h_)
|
|
|
|
# compute attention
|
|
b, c, h, w = q1.shape
|
|
|
|
q2 = q1.reshape(b, c, h*w)
|
|
del q1
|
|
|
|
q = q2.permute(0, 2, 1) # b,hw,c
|
|
del q2
|
|
|
|
k = k1.reshape(b, c, h*w) # b,c,hw
|
|
del k1
|
|
|
|
h_ = torch.zeros_like(k, device=q.device)
|
|
|
|
mem_free_total = get_available_vram()
|
|
|
|
tensor_size = q.shape[0] * q.shape[1] * k.shape[2] * q.element_size()
|
|
mem_required = tensor_size * 2.5
|
|
steps = 1
|
|
|
|
if mem_required > mem_free_total:
|
|
steps = 2**(math.ceil(math.log(mem_required / mem_free_total, 2)))
|
|
|
|
slice_size = q.shape[1] // steps if (q.shape[1] % steps) == 0 else q.shape[1]
|
|
for i in range(0, q.shape[1], slice_size):
|
|
end = i + slice_size
|
|
|
|
w1 = torch.bmm(q[:, i:end], k) # b,hw,hw w[b,i,j]=sum_c q[b,i,c]k[b,c,j]
|
|
w2 = w1 * (int(c)**(-0.5))
|
|
del w1
|
|
w3 = torch.nn.functional.softmax(w2, dim=2, dtype=q.dtype)
|
|
del w2
|
|
|
|
# attend to values
|
|
v1 = v.reshape(b, c, h*w)
|
|
w4 = w3.permute(0, 2, 1) # b,hw,hw (first hw of k, second of q)
|
|
del w3
|
|
|
|
h_[:, :, i:end] = torch.bmm(v1, w4) # b, c,hw (hw of q) h_[b,c,j] = sum_i v[b,c,i] w_[b,i,j]
|
|
del v1, w4
|
|
|
|
h2 = h_.reshape(b, c, h, w)
|
|
del h_
|
|
|
|
h3 = self.proj_out(h2)
|
|
del h2
|
|
|
|
h3 += x
|
|
|
|
return h3
|
|
|
|
def xformers_attnblock_forward(self, x):
|
|
try:
|
|
h_ = x
|
|
h_ = self.norm(h_)
|
|
q = self.q(h_)
|
|
k = self.k(h_)
|
|
v = self.v(h_)
|
|
b, c, h, w = q.shape
|
|
q, k, v = (rearrange(t, 'b c h w -> b (h w) c') for t in (q, k, v))
|
|
dtype = q.dtype
|
|
if shared.opts.upcast_attn:
|
|
q, k = q.float(), k.float()
|
|
q = q.contiguous()
|
|
k = k.contiguous()
|
|
v = v.contiguous()
|
|
out = xformers.ops.memory_efficient_attention(q, k, v, op=get_xformers_flash_attention_op(q, k, v))
|
|
out = out.to(dtype)
|
|
out = rearrange(out, 'b (h w) c -> b c h w', h=h)
|
|
out = self.proj_out(out)
|
|
return x + out
|
|
except NotImplementedError:
|
|
return cross_attention_attnblock_forward(self, x)
|
|
|
|
def sdp_attnblock_forward(self, x):
|
|
h_ = x
|
|
h_ = self.norm(h_)
|
|
q = self.q(h_)
|
|
k = self.k(h_)
|
|
v = self.v(h_)
|
|
b, c, h, w = q.shape
|
|
q, k, v = (rearrange(t, 'b c h w -> b (h w) c') for t in (q, k, v))
|
|
dtype = q.dtype
|
|
if shared.opts.upcast_attn:
|
|
q, k = q.float(), k.float()
|
|
q = q.contiguous()
|
|
k = k.contiguous()
|
|
v = v.contiguous()
|
|
out = torch.nn.functional.scaled_dot_product_attention(q, k, v, dropout_p=0.0, is_causal=False)
|
|
out = out.to(dtype)
|
|
out = rearrange(out, 'b (h w) c -> b c h w', h=h)
|
|
out = self.proj_out(out)
|
|
return x + out
|
|
|
|
def sdp_no_mem_attnblock_forward(self, x):
|
|
with torch.backends.cuda.sdp_kernel(enable_flash=True, enable_math=True, enable_mem_efficient=False):
|
|
return sdp_attnblock_forward(self, x)
|
|
|
|
def sub_quad_attnblock_forward(self, x):
|
|
h_ = x
|
|
h_ = self.norm(h_)
|
|
q = self.q(h_)
|
|
k = self.k(h_)
|
|
v = self.v(h_)
|
|
b, c, h, w = q.shape
|
|
q, k, v = (rearrange(t, 'b c h w -> b (h w) c') for t in (q, k, v))
|
|
q = q.contiguous()
|
|
k = k.contiguous()
|
|
v = v.contiguous()
|
|
out = sub_quad_attention(q, k, v, q_chunk_size=shared.cmd_opts.sub_quad_q_chunk_size, kv_chunk_size=shared.cmd_opts.sub_quad_kv_chunk_size, chunk_threshold=shared.cmd_opts.sub_quad_chunk_threshold, use_checkpoint=self.training)
|
|
out = rearrange(out, 'b (h w) c -> b c h w', h=h)
|
|
out = self.proj_out(out)
|
|
return x + out
|