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73 lines
3.1 KiB
Python
73 lines
3.1 KiB
Python
import einops
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import torch
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from invokeai.app.invocations.baseinvocation import BaseInvocation, invocation
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from invokeai.app.invocations.fields import (
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FieldDescriptions,
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ImageField,
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Input,
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InputField,
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)
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from invokeai.app.invocations.model import VAEField
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from invokeai.app.invocations.primitives import LatentsOutput
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from invokeai.app.services.shared.invocation_context import InvocationContext
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from invokeai.backend.flux.modules.autoencoder import AutoEncoder
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from invokeai.backend.model_manager.load.load_base import LoadedModel
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from invokeai.backend.stable_diffusion.diffusers_pipeline import image_resized_to_grid_as_tensor
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from invokeai.backend.util.devices import TorchDevice
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from invokeai.backend.util.vae_working_memory import estimate_vae_working_memory_flux
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@invocation(
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"flux_vae_encode",
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title="Image to Latents - FLUX",
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tags=["latents", "image", "vae", "i2l", "flux"],
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category="latents",
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version="1.0.1",
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)
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class FluxVaeEncodeInvocation(BaseInvocation):
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"""Encodes an image into latents."""
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image: ImageField = InputField(
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description="The image to encode.",
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)
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vae: VAEField = InputField(
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description=FieldDescriptions.vae,
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input=Input.Connection,
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)
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@staticmethod
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def vae_encode(vae_info: LoadedModel, image_tensor: torch.Tensor) -> torch.Tensor:
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# TODO(ryand): Expose seed parameter at the invocation level.
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# TODO(ryand): Write a util function for generating random tensors that is consistent across devices / dtypes.
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# There's a starting point in get_noise(...), but it needs to be extracted and generalized. This function
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# should be used for VAE encode sampling.
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assert isinstance(vae_info.model, AutoEncoder)
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estimated_working_memory = estimate_vae_working_memory_flux(
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operation="encode", image_tensor=image_tensor, vae=vae_info.model
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)
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generator = torch.Generator(device=TorchDevice.choose_torch_device()).manual_seed(0)
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with vae_info.model_on_device(working_mem_bytes=estimated_working_memory) as (_, vae):
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assert isinstance(vae, AutoEncoder)
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vae_dtype = next(iter(vae.parameters())).dtype
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image_tensor = image_tensor.to(device=TorchDevice.choose_torch_device(), dtype=vae_dtype)
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latents = vae.encode(image_tensor, sample=True, generator=generator)
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return latents
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@torch.no_grad()
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def invoke(self, context: InvocationContext) -> LatentsOutput:
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image = context.images.get_pil(self.image.image_name)
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vae_info = context.models.load(self.vae.vae)
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image_tensor = image_resized_to_grid_as_tensor(image.convert("RGB"))
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if image_tensor.dim() == 3:
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image_tensor = einops.rearrange(image_tensor, "c h w -> 1 c h w")
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context.util.signal_progress("Running VAE")
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latents = self.vae_encode(vae_info=vae_info, image_tensor=image_tensor)
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latents = latents.to("cpu")
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name = context.tensors.save(tensor=latents)
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return LatentsOutput.build(latents_name=name, latents=latents, seed=None)
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