mirror of
https://github.com/invoke-ai/InvokeAI
synced 2024-08-30 20:32:17 +00:00
666 lines
32 KiB
Python
666 lines
32 KiB
Python
from __future__ import annotations
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import dataclasses
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import inspect
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import secrets
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import sys
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from dataclasses import dataclass, field
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from typing import List, Optional, Union, Callable, Type, TypeVar, Generic, Any
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if sys.version_info < (3, 10):
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from typing_extensions import ParamSpec
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else:
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from typing import ParamSpec
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import PIL.Image
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import einops
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import torch
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import torchvision.transforms as T
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from diffusers.utils.import_utils import is_xformers_available
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from ...models.diffusion.cross_attention_map_saving import AttentionMapSaver
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from ...modules.prompt_to_embeddings_converter import WeightedPromptFragmentsToEmbeddingsConverter
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from diffusers.models import AutoencoderKL, UNet2DConditionModel
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from diffusers.pipelines.stable_diffusion import StableDiffusionPipelineOutput
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from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion import StableDiffusionPipeline
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from diffusers.pipelines.stable_diffusion.pipeline_stable_diffusion_img2img import StableDiffusionImg2ImgPipeline
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from diffusers.pipelines.stable_diffusion.safety_checker import StableDiffusionSafetyChecker
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from diffusers.schedulers.scheduling_utils import SchedulerMixin, SchedulerOutput
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from diffusers.schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
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from diffusers.utils.outputs import BaseOutput
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from torchvision.transforms.functional import resize as tv_resize
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from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
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from ldm.invoke.globals import Globals
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from ldm.models.diffusion.shared_invokeai_diffusion import InvokeAIDiffuserComponent, ThresholdSettings
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from ldm.modules.textual_inversion_manager import TextualInversionManager
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@dataclass
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class PipelineIntermediateState:
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run_id: str
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step: int
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timestep: int
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latents: torch.Tensor
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predicted_original: Optional[torch.Tensor] = None
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attention_map_saver: Optional[AttentionMapSaver] = None
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# copied from configs/stable-diffusion/v1-inference.yaml
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_default_personalization_config_params = dict(
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placeholder_strings=["*"],
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initializer_wods=["sculpture"],
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per_image_tokens=False,
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num_vectors_per_token=1,
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progressive_words=False
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)
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@dataclass
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class AddsMaskLatents:
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"""Add the channels required for inpainting model input.
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The inpainting model takes the normal latent channels as input, _plus_ a one-channel mask
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and the latent encoding of the base image.
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This class assumes the same mask and base image should apply to all items in the batch.
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"""
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forward: Callable[[torch.Tensor, torch.Tensor, torch.Tensor], torch.Tensor]
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mask: torch.Tensor
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initial_image_latents: torch.Tensor
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def __call__(self, latents: torch.Tensor, t: torch.Tensor, text_embeddings: torch.Tensor) -> torch.Tensor:
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model_input = self.add_mask_channels(latents)
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return self.forward(model_input, t, text_embeddings)
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def add_mask_channels(self, latents):
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batch_size = latents.size(0)
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# duplicate mask and latents for each batch
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mask = einops.repeat(self.mask, 'b c h w -> (repeat b) c h w', repeat=batch_size)
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image_latents = einops.repeat(self.initial_image_latents, 'b c h w -> (repeat b) c h w', repeat=batch_size)
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# add mask and image as additional channels
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model_input, _ = einops.pack([latents, mask, image_latents], 'b * h w')
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return model_input
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def are_like_tensors(a: torch.Tensor, b: object) -> bool:
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return (
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isinstance(b, torch.Tensor)
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and (a.size() == b.size())
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)
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@dataclass
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class AddsMaskGuidance:
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mask: torch.FloatTensor
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mask_latents: torch.FloatTensor
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scheduler: SchedulerMixin
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noise: torch.Tensor
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_debug: Optional[Callable] = None
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def __call__(self, step_output: BaseOutput | SchedulerOutput, t: torch.Tensor, conditioning) -> BaseOutput:
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output_class = step_output.__class__ # We'll create a new one with masked data.
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# The problem with taking SchedulerOutput instead of the model output is that we're less certain what's in it.
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# It's reasonable to assume the first thing is prev_sample, but then does it have other things
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# like pred_original_sample? Should we apply the mask to them too?
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# But what if there's just some other random field?
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prev_sample = step_output[0]
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# Mask anything that has the same shape as prev_sample, return others as-is.
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return output_class(
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{k: (self.apply_mask(v, self._t_for_field(k, t))
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if are_like_tensors(prev_sample, v) else v)
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for k, v in step_output.items()}
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)
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def _t_for_field(self, field_name:str, t):
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if field_name == "pred_original_sample":
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return torch.zeros_like(t, dtype=t.dtype) # it represents t=0
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return t
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def apply_mask(self, latents: torch.Tensor, t) -> torch.Tensor:
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batch_size = latents.size(0)
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mask = einops.repeat(self.mask, 'b c h w -> (repeat b) c h w', repeat=batch_size)
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if t.dim() == 0:
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# some schedulers expect t to be one-dimensional.
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# TODO: file diffusers bug about inconsistency?
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t = einops.repeat(t, '-> batch', batch=batch_size)
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# Noise shouldn't be re-randomized between steps here. The multistep schedulers
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# get very confused about what is happening from step to step when we do that.
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mask_latents = self.scheduler.add_noise(self.mask_latents, self.noise, t)
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# TODO: Do we need to also apply scheduler.scale_model_input? Or is add_noise appropriately scaled already?
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# mask_latents = self.scheduler.scale_model_input(mask_latents, t)
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mask_latents = einops.repeat(mask_latents, 'b c h w -> (repeat b) c h w', repeat=batch_size)
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masked_input = torch.lerp(mask_latents.to(dtype=latents.dtype), latents, mask.to(dtype=latents.dtype))
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if self._debug:
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self._debug(masked_input, f"t={t} lerped")
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return masked_input
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def trim_to_multiple_of(*args, multiple_of=8):
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return tuple((x - x % multiple_of) for x in args)
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def image_resized_to_grid_as_tensor(image: PIL.Image.Image, normalize: bool=True, multiple_of=8) -> torch.FloatTensor:
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"""
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:param image: input image
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:param normalize: scale the range to [-1, 1] instead of [0, 1]
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:param multiple_of: resize the input so both dimensions are a multiple of this
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"""
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w, h = trim_to_multiple_of(*image.size)
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transformation = T.Compose([
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T.Resize((h, w), T.InterpolationMode.LANCZOS),
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T.ToTensor(),
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])
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tensor = transformation(image)
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if normalize:
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tensor = tensor * 2.0 - 1.0
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return tensor
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def is_inpainting_model(unet: UNet2DConditionModel):
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return unet.conv_in.in_channels == 9
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CallbackType = TypeVar('CallbackType')
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ReturnType = TypeVar('ReturnType')
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ParamType = ParamSpec('ParamType')
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@dataclass(frozen=True)
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class GeneratorToCallbackinator(Generic[ParamType, ReturnType, CallbackType]):
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"""Convert a generator to a function with a callback and a return value."""
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generator_method: Callable[ParamType, ReturnType]
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callback_arg_type: Type[CallbackType]
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def __call__(self, *args: ParamType.args,
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callback:Callable[[CallbackType], Any]=None,
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**kwargs: ParamType.kwargs) -> ReturnType:
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result = None
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for result in self.generator_method(*args, **kwargs):
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if callback is not None and isinstance(result, self.callback_arg_type):
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callback(result)
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if result is None:
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raise AssertionError("why was that an empty generator?")
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return result
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@dataclass(frozen=True)
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class ConditioningData:
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unconditioned_embeddings: torch.Tensor
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text_embeddings: torch.Tensor
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guidance_scale: float
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"""
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Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
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`guidance_scale` is defined as `w` of equation 2. of [Imagen Paper](https://arxiv.org/pdf/2205.11487.pdf).
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Guidance scale is enabled by setting `guidance_scale > 1`. Higher guidance scale encourages to generate
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images that are closely linked to the text `prompt`, usually at the expense of lower image quality.
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"""
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extra: Optional[InvokeAIDiffuserComponent.ExtraConditioningInfo] = None
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scheduler_args: dict[str, Any] = field(default_factory=dict)
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"""Additional arguments to pass to scheduler.step."""
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threshold: Optional[ThresholdSettings] = None
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@property
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def dtype(self):
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return self.text_embeddings.dtype
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def add_scheduler_args_if_applicable(self, scheduler, **kwargs):
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scheduler_args = dict(self.scheduler_args)
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step_method = inspect.signature(scheduler.step)
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for name, value in kwargs.items():
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try:
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step_method.bind_partial(**{name: value})
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except TypeError:
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# FIXME: don't silently discard arguments
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pass # debug("%s does not accept argument named %r", scheduler, name)
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else:
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scheduler_args[name] = value
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return dataclasses.replace(self, scheduler_args=scheduler_args)
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@dataclass
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class InvokeAIStableDiffusionPipelineOutput(StableDiffusionPipelineOutput):
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r"""
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Output class for InvokeAI's Stable Diffusion pipeline.
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Args:
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attention_map_saver (`AttentionMapSaver`): Object containing attention maps that can be displayed to the user
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after generation completes. Optional.
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"""
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attention_map_saver: Optional[AttentionMapSaver]
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class StableDiffusionGeneratorPipeline(StableDiffusionPipeline):
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r"""
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Pipeline for text-to-image generation using Stable Diffusion.
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This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
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library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
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Implementation note: This class started as a refactored copy of diffusers.StableDiffusionPipeline.
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Hopefully future versions of diffusers provide access to more of these functions so that we don't
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need to duplicate them here: https://github.com/huggingface/diffusers/issues/551#issuecomment-1281508384
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Args:
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vae ([`AutoencoderKL`]):
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Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
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text_encoder ([`CLIPTextModel`]):
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Frozen text-encoder. Stable Diffusion uses the text portion of
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[CLIP](https://huggingface.co/docs/transformers/model_doc/clip#transformers.CLIPTextModel), specifically
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the [clip-vit-large-patch14](https://huggingface.co/openai/clip-vit-large-patch14) variant.
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tokenizer (`CLIPTokenizer`):
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Tokenizer of class
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[CLIPTokenizer](https://huggingface.co/docs/transformers/v4.21.0/en/model_doc/clip#transformers.CLIPTokenizer).
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unet ([`UNet2DConditionModel`]): Conditional U-Net architecture to denoise the encoded image latents.
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scheduler ([`SchedulerMixin`]):
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A scheduler to be used in combination with `unet` to denoise the encoded image latens. Can be one of
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[`DDIMScheduler`], [`LMSDiscreteScheduler`], or [`PNDMScheduler`].
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safety_checker ([`StableDiffusionSafetyChecker`]):
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Classification module that estimates whether generated images could be considered offsensive or harmful.
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Please, refer to the [model card](https://huggingface.co/CompVis/stable-diffusion-v1-4) for details.
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feature_extractor ([`CLIPFeatureExtractor`]):
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Model that extracts features from generated images to be used as inputs for the `safety_checker`.
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"""
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ID_LENGTH = 8
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def __init__(
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self,
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vae: AutoencoderKL,
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text_encoder: CLIPTextModel,
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tokenizer: CLIPTokenizer,
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unet: UNet2DConditionModel,
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scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
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safety_checker: Optional[StableDiffusionSafetyChecker],
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feature_extractor: Optional[CLIPFeatureExtractor],
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requires_safety_checker: bool = False,
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precision: str = 'float32',
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):
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super().__init__(vae, text_encoder, tokenizer, unet, scheduler,
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safety_checker, feature_extractor, requires_safety_checker)
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self.register_modules(
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vae=vae,
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text_encoder=text_encoder,
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tokenizer=tokenizer,
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unet=unet,
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scheduler=scheduler,
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safety_checker=safety_checker,
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feature_extractor=feature_extractor,
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)
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self.invokeai_diffuser = InvokeAIDiffuserComponent(self.unet, self._unet_forward, is_running_diffusers=True)
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use_full_precision = (precision == 'float32' or precision == 'autocast')
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self.textual_inversion_manager = TextualInversionManager(tokenizer=self.tokenizer,
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text_encoder=self.text_encoder,
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full_precision=use_full_precision)
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# InvokeAI's interface for text embeddings and whatnot
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self.prompt_fragments_to_embeddings_converter = WeightedPromptFragmentsToEmbeddingsConverter(
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tokenizer=self.tokenizer,
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text_encoder=self.text_encoder,
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textual_inversion_manager=self.textual_inversion_manager
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)
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self._enable_memory_efficient_attention()
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def _enable_memory_efficient_attention(self):
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"""
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if xformers is available, use it, otherwise use sliced attention.
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"""
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if is_xformers_available() and not Globals.disable_xformers:
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self.enable_xformers_memory_efficient_attention()
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else:
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if torch.backends.mps.is_available():
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# until pytorch #91617 is fixed, slicing is borked on MPS
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# https://github.com/pytorch/pytorch/issues/91617
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# fix is in https://github.com/kulinseth/pytorch/pull/222 but no idea when it will get merged to pytorch mainline.
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pass
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else:
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self.enable_attention_slicing(slice_size='max')
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def image_from_embeddings(self, latents: torch.Tensor, num_inference_steps: int,
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conditioning_data: ConditioningData,
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*,
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noise: torch.Tensor,
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callback: Callable[[PipelineIntermediateState], None]=None,
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run_id=None) -> InvokeAIStableDiffusionPipelineOutput:
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r"""
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Function invoked when calling the pipeline for generation.
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:param conditioning_data:
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:param latents: Pre-generated un-noised latents, to be used as inputs for
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image generation. Can be used to tweak the same generation with different prompts.
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:param num_inference_steps: The number of denoising steps. More denoising steps usually lead to a higher quality
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image at the expense of slower inference.
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:param noise: Noise to add to the latents, sampled from a Gaussian distribution.
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:param callback:
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:param run_id:
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"""
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result_latents, result_attention_map_saver = self.latents_from_embeddings(
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latents, num_inference_steps,
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conditioning_data,
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noise=noise,
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run_id=run_id,
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callback=callback)
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# https://discuss.huggingface.co/t/memory-usage-by-later-pipeline-stages/23699
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torch.cuda.empty_cache()
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with torch.inference_mode():
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image = self.decode_latents(result_latents)
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output = InvokeAIStableDiffusionPipelineOutput(images=image, nsfw_content_detected=[], attention_map_saver=result_attention_map_saver)
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return self.check_for_safety(output, dtype=conditioning_data.dtype)
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def latents_from_embeddings(self, latents: torch.Tensor, num_inference_steps: int,
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conditioning_data: ConditioningData,
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*,
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noise: torch.Tensor,
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timesteps=None,
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additional_guidance: List[Callable] = None, run_id=None,
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callback: Callable[[PipelineIntermediateState], None] = None
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) -> tuple[torch.Tensor, Optional[AttentionMapSaver]]:
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if timesteps is None:
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self.scheduler.set_timesteps(num_inference_steps, device=self.unet.device)
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timesteps = self.scheduler.timesteps
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infer_latents_from_embeddings = GeneratorToCallbackinator(self.generate_latents_from_embeddings, PipelineIntermediateState)
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result: PipelineIntermediateState = infer_latents_from_embeddings(
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latents, timesteps, conditioning_data,
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noise=noise,
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additional_guidance=additional_guidance,
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run_id=run_id,
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callback=callback)
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return result.latents, result.attention_map_saver
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def generate_latents_from_embeddings(self, latents: torch.Tensor, timesteps,
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conditioning_data: ConditioningData,
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*,
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noise: torch.Tensor,
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run_id: str = None,
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additional_guidance: List[Callable] = None):
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if run_id is None:
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run_id = secrets.token_urlsafe(self.ID_LENGTH)
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if additional_guidance is None:
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additional_guidance = []
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extra_conditioning_info = conditioning_data.extra
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with self.invokeai_diffuser.custom_attention_context(extra_conditioning_info=extra_conditioning_info,
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step_count=len(self.scheduler.timesteps)
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):
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yield PipelineIntermediateState(run_id=run_id, step=-1, timestep=self.scheduler.num_train_timesteps,
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latents=latents)
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batch_size = latents.shape[0]
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batched_t = torch.full((batch_size,), timesteps[0],
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dtype=timesteps.dtype, device=self.unet.device)
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latents = self.scheduler.add_noise(latents, noise, batched_t)
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attention_map_saver: Optional[AttentionMapSaver] = None
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for i, t in enumerate(self.progress_bar(timesteps)):
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batched_t.fill_(t)
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step_output = self.step(batched_t, latents, conditioning_data,
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step_index=i,
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total_step_count=len(timesteps),
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additional_guidance=additional_guidance)
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latents = step_output.prev_sample
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predicted_original = getattr(step_output, 'pred_original_sample', None)
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# TODO resuscitate attention map saving
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#if i == len(timesteps)-1 and extra_conditioning_info is not None:
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# eos_token_index = extra_conditioning_info.tokens_count_including_eos_bos - 1
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# attention_map_token_ids = range(1, eos_token_index)
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# attention_map_saver = AttentionMapSaver(token_ids=attention_map_token_ids, latents_shape=latents.shape[-2:])
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# self.invokeai_diffuser.setup_attention_map_saving(attention_map_saver)
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yield PipelineIntermediateState(run_id=run_id, step=i, timestep=int(t), latents=latents,
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predicted_original=predicted_original, attention_map_saver=attention_map_saver)
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return latents, attention_map_saver
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@torch.inference_mode()
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def step(self, t: torch.Tensor, latents: torch.Tensor,
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conditioning_data: ConditioningData,
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step_index:int, total_step_count:int,
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additional_guidance: List[Callable] = None):
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# invokeai_diffuser has batched timesteps, but diffusers schedulers expect a single value
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timestep = t[0]
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if additional_guidance is None:
|
|
additional_guidance = []
|
|
|
|
# TODO: should this scaling happen here or inside self._unet_forward?
|
|
# i.e. before or after passing it to InvokeAIDiffuserComponent
|
|
latent_model_input = self.scheduler.scale_model_input(latents, timestep)
|
|
|
|
# predict the noise residual
|
|
noise_pred = self.invokeai_diffuser.do_diffusion_step(
|
|
latent_model_input, t,
|
|
conditioning_data.unconditioned_embeddings, conditioning_data.text_embeddings,
|
|
conditioning_data.guidance_scale,
|
|
step_index=step_index,
|
|
total_step_count=total_step_count,
|
|
threshold=conditioning_data.threshold
|
|
)
|
|
|
|
# compute the previous noisy sample x_t -> x_t-1
|
|
step_output = self.scheduler.step(noise_pred, timestep, latents,
|
|
**conditioning_data.scheduler_args)
|
|
|
|
# TODO: this additional_guidance extension point feels redundant with InvokeAIDiffusionComponent.
|
|
# But the way things are now, scheduler runs _after_ that, so there was
|
|
# no way to use it to apply an operation that happens after the last scheduler.step.
|
|
for guidance in additional_guidance:
|
|
step_output = guidance(step_output, timestep, conditioning_data)
|
|
|
|
return step_output
|
|
|
|
def _unet_forward(self, latents, t, text_embeddings, cross_attention_kwargs: Optional[dict[str,Any]] = None):
|
|
"""predict the noise residual"""
|
|
if is_inpainting_model(self.unet) and latents.size(1) == 4:
|
|
# Pad out normal non-inpainting inputs for an inpainting model.
|
|
# FIXME: There are too many layers of functions and we have too many different ways of
|
|
# overriding things! This should get handled in a way more consistent with the other
|
|
# use of AddsMaskLatents.
|
|
latents = AddsMaskLatents(
|
|
self._unet_forward,
|
|
mask=torch.ones_like(latents[:1, :1], device=latents.device, dtype=latents.dtype),
|
|
initial_image_latents=torch.zeros_like(latents[:1], device=latents.device, dtype=latents.dtype)
|
|
).add_mask_channels(latents)
|
|
|
|
return self.unet(sample=latents,
|
|
timestep=t,
|
|
encoder_hidden_states=text_embeddings,
|
|
cross_attention_kwargs=cross_attention_kwargs).sample
|
|
|
|
def img2img_from_embeddings(self,
|
|
init_image: Union[torch.FloatTensor, PIL.Image.Image],
|
|
strength: float,
|
|
num_inference_steps: int,
|
|
conditioning_data: ConditioningData,
|
|
*, callback: Callable[[PipelineIntermediateState], None] = None,
|
|
run_id=None,
|
|
noise_func=None
|
|
) -> InvokeAIStableDiffusionPipelineOutput:
|
|
if isinstance(init_image, PIL.Image.Image):
|
|
init_image = image_resized_to_grid_as_tensor(init_image.convert('RGB'))
|
|
|
|
if init_image.dim() == 3:
|
|
init_image = einops.rearrange(init_image, 'c h w -> 1 c h w')
|
|
|
|
# 6. Prepare latent variables
|
|
device = self.unet.device
|
|
latents_dtype = self.unet.dtype
|
|
initial_latents = self.non_noised_latents_from_image(init_image, device=device, dtype=latents_dtype)
|
|
noise = noise_func(initial_latents)
|
|
|
|
return self.img2img_from_latents_and_embeddings(initial_latents, num_inference_steps,
|
|
conditioning_data,
|
|
strength,
|
|
noise, run_id, callback)
|
|
|
|
def img2img_from_latents_and_embeddings(self, initial_latents, num_inference_steps,
|
|
conditioning_data: ConditioningData,
|
|
strength,
|
|
noise: torch.Tensor, run_id=None, callback=None
|
|
) -> InvokeAIStableDiffusionPipelineOutput:
|
|
timesteps, _ = self.get_img2img_timesteps(num_inference_steps, strength, self.unet.device)
|
|
result_latents, result_attention_maps = self.latents_from_embeddings(
|
|
initial_latents, num_inference_steps, conditioning_data,
|
|
timesteps=timesteps,
|
|
noise=noise,
|
|
run_id=run_id,
|
|
callback=callback)
|
|
|
|
# https://discuss.huggingface.co/t/memory-usage-by-later-pipeline-stages/23699
|
|
torch.cuda.empty_cache()
|
|
|
|
with torch.inference_mode():
|
|
image = self.decode_latents(result_latents)
|
|
output = InvokeAIStableDiffusionPipelineOutput(images=image, nsfw_content_detected=[], attention_map_saver=result_attention_maps)
|
|
return self.check_for_safety(output, dtype=conditioning_data.dtype)
|
|
|
|
def get_img2img_timesteps(self, num_inference_steps: int, strength: float, device) -> (torch.Tensor, int):
|
|
img2img_pipeline = StableDiffusionImg2ImgPipeline(**self.components)
|
|
assert img2img_pipeline.scheduler is self.scheduler
|
|
img2img_pipeline.scheduler.set_timesteps(num_inference_steps, device=device)
|
|
timesteps, adjusted_steps = img2img_pipeline.get_timesteps(num_inference_steps, strength, device=device)
|
|
# Workaround for low strength resulting in zero timesteps.
|
|
# TODO: submit upstream fix for zero-step img2img
|
|
if timesteps.numel() == 0:
|
|
timesteps = self.scheduler.timesteps[-1:]
|
|
adjusted_steps = timesteps.numel()
|
|
return timesteps, adjusted_steps
|
|
|
|
def inpaint_from_embeddings(
|
|
self,
|
|
init_image: torch.FloatTensor,
|
|
mask: torch.FloatTensor,
|
|
strength: float,
|
|
num_inference_steps: int,
|
|
conditioning_data: ConditioningData,
|
|
*, callback: Callable[[PipelineIntermediateState], None] = None,
|
|
run_id=None,
|
|
noise_func=None,
|
|
) -> InvokeAIStableDiffusionPipelineOutput:
|
|
device = self.unet.device
|
|
latents_dtype = self.unet.dtype
|
|
|
|
if isinstance(init_image, PIL.Image.Image):
|
|
init_image = image_resized_to_grid_as_tensor(init_image.convert('RGB'))
|
|
|
|
init_image = init_image.to(device=device, dtype=latents_dtype)
|
|
mask = mask.to(device=device, dtype=latents_dtype)
|
|
|
|
if init_image.dim() == 3:
|
|
init_image = init_image.unsqueeze(0)
|
|
|
|
timesteps, _ = self.get_img2img_timesteps(num_inference_steps, strength, device=device)
|
|
|
|
# 6. Prepare latent variables
|
|
# can't quite use upstream StableDiffusionImg2ImgPipeline.prepare_latents
|
|
# because we have our own noise function
|
|
init_image_latents = self.non_noised_latents_from_image(init_image, device=device, dtype=latents_dtype)
|
|
noise = noise_func(init_image_latents)
|
|
|
|
if mask.dim() == 3:
|
|
mask = mask.unsqueeze(0)
|
|
latent_mask = tv_resize(mask, init_image_latents.shape[-2:], T.InterpolationMode.BILINEAR) \
|
|
.to(device=device, dtype=latents_dtype)
|
|
|
|
guidance: List[Callable] = []
|
|
|
|
if is_inpainting_model(self.unet):
|
|
# You'd think the inpainting model wouldn't be paying attention to the area it is going to repaint
|
|
# (that's why there's a mask!) but it seems to really want that blanked out.
|
|
masked_init_image = init_image * torch.where(mask < 0.5, 1, 0)
|
|
masked_latents = self.non_noised_latents_from_image(masked_init_image, device=device, dtype=latents_dtype)
|
|
|
|
# TODO: we should probably pass this in so we don't have to try/finally around setting it.
|
|
self.invokeai_diffuser.model_forward_callback = \
|
|
AddsMaskLatents(self._unet_forward, latent_mask, masked_latents)
|
|
else:
|
|
guidance.append(AddsMaskGuidance(latent_mask, init_image_latents, self.scheduler, noise))
|
|
|
|
try:
|
|
result_latents, result_attention_maps = self.latents_from_embeddings(
|
|
init_image_latents, num_inference_steps,
|
|
conditioning_data, noise=noise, timesteps=timesteps,
|
|
additional_guidance=guidance,
|
|
run_id=run_id, callback=callback)
|
|
finally:
|
|
self.invokeai_diffuser.model_forward_callback = self._unet_forward
|
|
|
|
# https://discuss.huggingface.co/t/memory-usage-by-later-pipeline-stages/23699
|
|
torch.cuda.empty_cache()
|
|
|
|
with torch.inference_mode():
|
|
image = self.decode_latents(result_latents)
|
|
output = InvokeAIStableDiffusionPipelineOutput(images=image, nsfw_content_detected=[], attention_map_saver=result_attention_maps)
|
|
return self.check_for_safety(output, dtype=conditioning_data.dtype)
|
|
|
|
def non_noised_latents_from_image(self, init_image, *, device: torch.device, dtype):
|
|
init_image = init_image.to(device=device, dtype=dtype)
|
|
with torch.inference_mode():
|
|
if device.type == 'mps':
|
|
# workaround for torch MPS bug that has been fixed in https://github.com/kulinseth/pytorch/pull/222
|
|
# TODO remove this workaround once kulinseth#222 is merged to pytorch mainline
|
|
self.vae.to('cpu')
|
|
init_image = init_image.to('cpu')
|
|
init_latent_dist = self.vae.encode(init_image).latent_dist
|
|
init_latents = init_latent_dist.sample().to(dtype=dtype) # FIXME: uses torch.randn. make reproducible!
|
|
if device.type == 'mps':
|
|
self.vae.to(device)
|
|
init_latents = init_latents.to(device)
|
|
|
|
init_latents = 0.18215 * init_latents
|
|
return init_latents
|
|
|
|
def check_for_safety(self, output, dtype):
|
|
with torch.inference_mode():
|
|
screened_images, has_nsfw_concept = self.run_safety_checker(
|
|
output.images, device=self._execution_device, dtype=dtype)
|
|
screened_attention_map_saver = None
|
|
if has_nsfw_concept is None or not has_nsfw_concept:
|
|
screened_attention_map_saver = output.attention_map_saver
|
|
return InvokeAIStableDiffusionPipelineOutput(screened_images,
|
|
has_nsfw_concept,
|
|
# block the attention maps if NSFW content is detected
|
|
attention_map_saver=screened_attention_map_saver)
|
|
|
|
@torch.inference_mode()
|
|
def get_learned_conditioning(self, c: List[List[str]], *, return_tokens=True, fragment_weights=None):
|
|
"""
|
|
Compatibility function for ldm.models.diffusion.ddpm.LatentDiffusion.
|
|
"""
|
|
return self.prompt_fragments_to_embeddings_converter.get_embeddings_for_weighted_prompt_fragments(
|
|
text=c,
|
|
fragment_weights=fragment_weights,
|
|
should_return_tokens=return_tokens,
|
|
device=self.device)
|
|
|
|
@property
|
|
def cond_stage_model(self):
|
|
return self.prompt_fragments_to_embeddings_converter
|
|
|
|
@torch.inference_mode()
|
|
def _tokenize(self, prompt: Union[str, List[str]]):
|
|
return self.tokenizer(
|
|
prompt,
|
|
padding="max_length",
|
|
max_length=self.tokenizer.model_max_length,
|
|
truncation=True,
|
|
return_tensors="pt",
|
|
)
|
|
|
|
@property
|
|
def channels(self) -> int:
|
|
"""Compatible with DiffusionWrapper"""
|
|
return self.unet.in_channels
|
|
|
|
def debug_latents(self, latents, msg):
|
|
with torch.inference_mode():
|
|
from ldm.util import debug_image
|
|
decoded = self.numpy_to_pil(self.decode_latents(latents))
|
|
for i, img in enumerate(decoded):
|
|
debug_image(img, f"latents {msg} {i+1}/{len(decoded)}", debug_status=True)
|