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相关概念视频

Phylogenetic Trees03:21

Phylogenetic Trees

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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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Survival Tree01:19

Survival Tree

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Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
 Building a Survival Tree
Constructing a...
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Phylogeny01:23

Phylogeny

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
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Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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Updated: Sep 17, 2025

A Practical Guide to Phylogenetics for Nonexperts
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torchtree:使用PyTorch进行灵活的遗传学模型开发和推断.

Mathieu Fourment1, Matthew Macaulay1, Christiaan J Swanepoel2,3

  • 1Australian Institute for Microbiology and Infection, University of Technology Sydney, Ultimo, 2007, Australia.

Systematic biology
|July 4, 2025
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概括
此摘要是机器生成的。

这项研究介绍了torchtree,这是一个用于遗传推断的PyTorch框架,为马尔科夫链蒙特卡洛 (MCMC) 提供了更快的替代方案. Torchtree利用变量贝叶斯来有效分析复杂的进化模型.

关键词:
贝叶斯的推理 贝叶斯的推理在PyTorch中使用PyTorch.人类遗传学 (phylogenetics) 是一个学科.变化的贝叶斯贝叶斯.

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科学领域:

  • 计算生物学 计算生物学
  • 进化生物学 进化生物学
  • 生物信息学是一种生物信息学.

背景情况:

  • 马尔科夫链蒙特卡洛 (MCMC) 是植物遗传学中贝叶斯推理的传统方法,但对于复杂的模型来说,它是计算密集的.
  • MCMC 的计算瓶阻碍了大型族系数据集和时间树模型的可扩展性.
  • 变量贝叶斯方法为贝叶斯推理提供了一个可扩展的替代方案,特别是对于大型数据集.

研究的目的:

  • 引入torchtree,一个灵活的Python框架,用于开发遗传学模型和算法.
  • 为了使有效的贝叶斯推理使用PyTorch的变量贝叶斯.
  • 探索在遗传学中用于变异推理的替代优化标准.

主要方法:

  • 开发 torchtree,一个使用 PyTorch 来实现家族遗传模型的 Python 框架.
  • 在火树内实现变量推理,支持自动分化和分析梯度.
  • 评估前期KL差异作为变化推理的优化标准,将其与证据下限 (ELBO) 进行比较.

主要成果:

  • "火树"的速度与像BEAST这样的现有工具相提并论,用于遗传学推断.
  • 使用火树的变量推理产生了有希望的近似准确性,尽管性能在不同的场景中有所不同.
  • 前进的KL分歧推理显示了比ELBO更快的代,而ELBO在某些情况下可能提供更快的趋同.

结论:

  • Torchtree提供了一个灵活和高效的框架,用于植物遗传模型开发和贝叶斯推理.
  • 该框架促进了对复杂的遗传学问题的变异贝叶斯方法的应用.
  • 对前方KL分歧的探索提供了一个可行的替代优化策略,用于遗传学中的变异推理.