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https://github.com/invoke-ai/InvokeAI
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127 lines
3.5 KiB
Python
127 lines
3.5 KiB
Python
# Copyright (c) 2023 Kyle Schouviller (https://github.com/kyle0654) & the InvokeAI Team
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import torch
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from pydantic import field_validator
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from invokeai.app.invocations.constants import LATENT_SCALE_FACTOR
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from invokeai.app.invocations.fields import FieldDescriptions, InputField, LatentsField, OutputField
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from invokeai.app.services.shared.invocation_context import InvocationContext
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from invokeai.app.util.misc import SEED_MAX
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from ...backend.util.devices import choose_torch_device, torch_dtype
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from .baseinvocation import (
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BaseInvocation,
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BaseInvocationOutput,
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invocation,
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invocation_output,
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)
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"""
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Utilities
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"""
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def get_noise(
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width: int,
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height: int,
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device: torch.device,
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seed: int = 0,
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latent_channels: int = 4,
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downsampling_factor: int = 8,
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use_cpu: bool = True,
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perlin: float = 0.0,
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):
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"""Generate noise for a given image size."""
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noise_device_type = "cpu" if use_cpu else device.type
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# limit noise to only the diffusion image channels, not the mask channels
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input_channels = min(latent_channels, 4)
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generator = torch.Generator(device=noise_device_type).manual_seed(seed)
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noise_tensor = torch.randn(
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[
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1,
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input_channels,
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height // downsampling_factor,
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width // downsampling_factor,
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],
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dtype=torch_dtype(device),
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device=noise_device_type,
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generator=generator,
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).to("cpu")
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return noise_tensor
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"""
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Nodes
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"""
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@invocation_output("noise_output")
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class NoiseOutput(BaseInvocationOutput):
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"""Invocation noise output"""
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noise: LatentsField = OutputField(description=FieldDescriptions.noise)
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width: int = OutputField(description=FieldDescriptions.width)
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height: int = OutputField(description=FieldDescriptions.height)
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@classmethod
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def build(cls, latents_name: str, latents: torch.Tensor, seed: int) -> "NoiseOutput":
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return cls(
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noise=LatentsField(latents_name=latents_name, seed=seed),
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width=latents.size()[3] * LATENT_SCALE_FACTOR,
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height=latents.size()[2] * LATENT_SCALE_FACTOR,
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)
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@invocation(
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"noise",
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title="Noise",
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tags=["latents", "noise"],
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category="latents",
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version="1.0.2",
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)
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class NoiseInvocation(BaseInvocation):
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"""Generates latent noise."""
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seed: int = InputField(
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default=0,
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ge=0,
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le=SEED_MAX,
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description=FieldDescriptions.seed,
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)
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width: int = InputField(
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default=512,
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multiple_of=LATENT_SCALE_FACTOR,
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gt=0,
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description=FieldDescriptions.width,
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)
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height: int = InputField(
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default=512,
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multiple_of=LATENT_SCALE_FACTOR,
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gt=0,
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description=FieldDescriptions.height,
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)
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use_cpu: bool = InputField(
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default=True,
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description="Use CPU for noise generation (for reproducible results across platforms)",
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)
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@field_validator("seed", mode="before")
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def modulo_seed(cls, v):
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"""Returns the seed modulo (SEED_MAX + 1) to ensure it is within the valid range."""
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return v % (SEED_MAX + 1)
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def invoke(self, context: InvocationContext) -> NoiseOutput:
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noise = get_noise(
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width=self.width,
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height=self.height,
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device=choose_torch_device(),
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seed=self.seed,
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use_cpu=self.use_cpu,
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)
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name = context.tensors.save(tensor=noise)
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return NoiseOutput.build(latents_name=name, latents=noise, seed=self.seed)
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