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TuoTuo

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Stable 0.2.7 release

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Tuotuo

Tuotuo用Python编写的主题建模库。 Tuotuo也是一个可爱的男孩，我的儿子，现在已经6个月大了。

安装

使用包装管理器PIP安装Tuotuo。您可能会在这里找到PYPI分布。

pip install TuoTuo --upgrade

用法

当前，库仅支持通过潜在Dirichlet分配（LDA）进行主题建模。众所周知，可以使用Gibbs采样和变异推理来实现LDA，我们选择后者，因为这在数学上更复杂

基于5个不同主题和40个唯一单词的预定的Dirichlet参数生成一些文档

 import torch as tr
from tuotuo . generator import doc_generator 

gen = doc_generator (
    M = 100 , 
    # we sample 100 documents 
    L = 20 , 
    # each document would contain 20 pre-defined words 
    topic_prior = tr . tensor ([ 1 , 1 , 1 , 1 , 1 ], dtype = tr . double )
    # we use a exchangable Dirichlet Distribution as our topic prior, 
    # that is a uniform distribution on 5 topics
)
train_docs = gen . generate_doc ()

形成培训文档并训练LDA中的变异推理参数

 from tuotuo . lda_model import LDASmoothed 
import matplotlib . pyplot as plt 

lda = LDASmoothed (
    num_topics = 5 , 
)

perplexes = lda . fit (
    train_docs ,
    sampling = False ,
    verbose = True , 
    return_perplexities = True ,
)
plt . plot ( perplexes )

= >= >= >= >= >= >= >= >
Topic Dirichlet Prior , Alpha
1

Exchangeable Word Dirichlet Prior , Eta 
1

Var Inf - Word Dirichlet prior , Lambda
( 5 , 40 )

Var Inf - Topic Dirichlet prior , Gamma
( 100 , 5 )

Init perplexity = 84.99592157507153
End perplexity = 45.96696541539976

超过100次迭代的困惑

根据变异推理参数查看每个主题的前5个单词： $ lambda $

 for topic_index in range ( lda . _lambda_ . shape [ 0 ]):

    top5 = np . argsort ( lda . _lambda_ [ topic_index ,:],)[ - 5 :]
    print ( f"Topic { topic_index } " )
    for i , idx in enumerate ( top5 ):
        print ( f"Top { i + 1 } -> { lda . train_doc . idx_to_vocab [ idx ] } " )
    print ()

= >= >= >= >= >= >= >= >
Topic 0 
Top 1 -> physical
Top 2 -> quantum
Top 3 -> research
Top 4 -> scientst
Top 5 -> astrophysics

Topic 1
Top 1 -> divorce
Top 2 -> attorney
Top 3 -> court
Top 4 -> bankrupt
Top 5 -> contract

Topic 2
Top 1 -> content
Top 2 -> Craftsmanship
Top 3 -> concert
Top 4 -> asymmetrical
Top 5 -> Symmetrical

Topic 3
Top 1 -> recreation
Top 2 -> FIFA
Top 3 -> football
Top 4 -> Olympic
Top 5 -> athletics

Topic 4
Top 1 -> fever
Top 2 -> appetite
Top 3 -> contagious
Top 4 -> decongestant
Top 5 -> injection