From 84d9ce30cb427759547bc7876ed80ab91787d175 Mon Sep 17 00:00:00 2001 From: brkirch Date: Tue, 24 Jan 2023 23:51:45 -0500 Subject: Add option for float32 sampling with float16 UNet This also handles type casting so that ROCm and MPS torch devices work correctly without --no-half. One cast is required for deepbooru in deepbooru_model.py, some explicit casting is required for img2img and inpainting. depth_model can't be converted to float16 or it won't work correctly on some systems (it's known to have issues on MPS) so in sd_models.py model.depth_model is removed for model.half(). --- modules/sd_hijack_unet.py | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'modules/sd_hijack_unet.py') diff --git a/modules/sd_hijack_unet.py b/modules/sd_hijack_unet.py index 18daf8c1..88c94e54 100644 --- a/modules/sd_hijack_unet.py +++ b/modules/sd_hijack_unet.py @@ -1,4 +1,8 @@ import torch +from packaging import version + +from modules import devices +from modules.sd_hijack_utils import CondFunc class TorchHijackForUnet: @@ -28,3 +32,28 @@ class TorchHijackForUnet: th = TorchHijackForUnet() + + +# Below are monkey patches to enable upcasting a float16 UNet for float32 sampling +def apply_model(orig_func, self, x_noisy, t, cond, **kwargs): + for y in cond.keys(): + cond[y] = [x.to(devices.dtype_unet) if isinstance(x, torch.Tensor) else x for x in cond[y]] + with devices.autocast(): + return orig_func(self, x_noisy.to(devices.dtype_unet), t.to(devices.dtype_unet), cond, **kwargs).float() + +class GELUHijack(torch.nn.GELU, torch.nn.Module): + def __init__(self, *args, **kwargs): + torch.nn.GELU.__init__(self, *args, **kwargs) + def forward(self, x): + if devices.unet_needs_upcast: + return torch.nn.GELU.forward(self.float(), x.float()).to(devices.dtype_unet) + else: + return torch.nn.GELU.forward(self, x) + +unet_needs_upcast = lambda *args, **kwargs: devices.unet_needs_upcast +CondFunc('ldm.models.diffusion.ddpm.LatentDiffusion.apply_model', apply_model, unet_needs_upcast) +CondFunc('ldm.modules.diffusionmodules.openaimodel.timestep_embedding', lambda orig_func, *args, **kwargs: orig_func(*args, **kwargs).to(devices.dtype_unet), unet_needs_upcast) +if version.parse(torch.__version__) <= version.parse("1.13.1"): + CondFunc('ldm.modules.diffusionmodules.util.GroupNorm32.forward', lambda orig_func, self, *args, **kwargs: orig_func(self.float(), *args, **kwargs), unet_needs_upcast) + CondFunc('ldm.modules.attention.GEGLU.forward', lambda orig_func, self, x: orig_func(self.float(), x.float()).to(devices.dtype_unet), unet_needs_upcast) + CondFunc('open_clip.transformer.ResidualAttentionBlock.__init__', lambda orig_func, *args, **kwargs: kwargs.update({'act_layer': GELUHijack}) and False or orig_func(*args, **kwargs), lambda _, *args, **kwargs: kwargs.get('act_layer') is None or kwargs['act_layer'] == torch.nn.GELU) -- cgit v1.2.3