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Rectified Flow


介绍:

Rectified Flow是一种用于高分辨率图像合成的深度学习方法。









Rectified Flow

Rectified Flow 是一种用于生成和传输数据的方法,由Xingchao Liu等人在2022年提出。它的核心思想是通过一种被称为“整流流动”(rectified flow)的技术来实现更高效和准确的数据生成过程。这种方法的实施可以使用 Pytorch 库进行,其核心为一个模型和相关的时间条件参数。

安装

可以通过以下命令安装所需的库:

$ pip install rectified-flow-pytorch
使用

以下是一个基本的用例展示:

import torch
from torch import nn
from rectified_flow_pytorch import RectifiedFlow

# 定义一个简单的卷积模型
model = nn.Conv2d(3, 3, 1)

# 实例化 Rectified Flow
rectified_flow = RectifiedFlow(model, time_cond_kwarg=None)

# 随机生成一些图像数据
images = torch.randn(1, 3, 256, 256)

# 计算损失并进行反向传播
loss = rectified_flow(images)
loss.backward()

# 生成样本
sampled = rectified_flow.sample()
assert sampled.shape[1:] == images.shape[1:]

对于引用论文中的 Reflow 方法,示例如下:

import torch
from torch import nn
from rectified_flow_pytorch import RectifiedFlow, Reflow

model = nn.Conv2d(3, 3, 1)
rectified_flow = RectifiedFlow(model, time_cond_kwarg=None)

images = torch.randn(1, 3, 256, 256)
loss = rectified_flow(images)
loss.backward()

# 对于许多真实图像重复上述操作

reflow = Reflow(rectified_flow)
reflow_loss = reflow()
reflow_loss.backward()

# 多次循环进行 Reflow - 可以通过重新定义 Reflow(reflow.model) 并再次循环进行多次 Reflow
sampled = reflow.sample()
assert sampled.shape[1:] == images.shape[1:]
适用场景

Rectified Flow 主要用于高效的图像生成和数据迁移。以下场景可以使用该技术:

  • 高分辨率图像生成
  • 数据增强与转换
  • 在图像生成领域的模型训练优化
参考文献

以下是一些相关的研究文献,可用于深入研究:

@article{Liu2022FlowSA,
    title   = {Flow Straight and Fast: Learning to Generate and Transfer Data with Rectified Flow},
    author  = {Xingchao Liu and Chengyue Gong and Qiang Liu},
    journal = {ArXiv},
    year    = {2022},
    volume  = {abs/2209.03003},
    url     = {https://api.semanticscholar.org/CorpusID:252111177}
}
@article{Lee2024ImprovingTT,
    title   = {Improving the Training of Rectified Flows},
    author  = {Sangyun Lee and Zinan Lin and Giulia Fanti},
    journal = {ArXiv},
    year    = {2024},
    volume  = {abs/2405.20320},
    url     = {https://api.semanticscholar.org/CorpusID:270123378}
}
@article{Esser2024ScalingRF,
    title   = {Scaling Rectified Flow Transformers for High-Resolution Image Synthesis},
    author  = {Patrick Esser and Sumith Kulal and A. Blattmann and Rahim Entezari and Jonas Muller and Harry Saini and Yam Levi and Dominik Lorenz and Axel Sauer and Frederic Boesel and Dustin Podell and Tim Dockhorn and Zion English and Kyle Lacey and Alex Goodwin and Yannik Marek and Robin Rombach},
    journal = {ArXiv},
    year    = {2024},
    volume  = {abs/2403.03206},
    url     = {https://api.semanticscholar.org/CorpusID:268247980}
}
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