Questions tagged [lda]

Latent Dirichlet Allocation (LDA) is an algorithm in the field of topic modeling.

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19 views

Probabilistic model of selecting subsets of words from documents?

Is there an existing probabilistic model that deals with the selection of subsets of words from a corpus of documents? Imagine a stack of documents where a subset of the words in each document has ...
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Gensim LDA model: return keywords based on relevance (λ - lambda) value

I am using gensim library for topic modeling, more specifically LDA. I have created my corpus, my dictionary and my lda model, and with the help of pyLDAvis library I visualize the results. When I ...
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how to do topic modeling on very huge data?

When i come to know that gensim is useful library for topic modeling, I tried it on my huge amount of document. It works well only if the dictionary size is to be fix. In my case i have each and every ...
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Further analysis after topic identificatio

Using lda to find topics ...
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1answer
23 views

Which are the appropriate prameters for lda modeling?

I try to implement in R test for appropriate metrics for lda. Here the way I try to use LDA ...
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16 views

Class Size Imbalance for LDA or any other Content based analysis

I am running some content analysis studies on my dataset which has two different classes, and each class has a respective list of the document I am analyzing. I compare the LDA topic model inference ...
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22 views

Where can I learn the complete mathematics involved in LDA?

I have come across Latent Dirichlet Allocation (LDA) on multiple occasions while reading about sentiment analysis and recommender systems. Where can I find good reading material which explains the ...
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67 views

LDA for sentiment analysis

As far as I understand it, LDA works by assuming that a corpus was written by a set of topics ands words corresponding to that topic by a specific distribution. I'm however not enterely sure what the ...
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297 views

BERT: it is possible to use it for topic modeling?

I'm struggling to understand which are the full capabilities of BERT: it is possible to make topic modeling of text, like the one we can achieve with LDA?
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23 views

Linking LDA topics to the input documents

I am new to LDA topic modelling. I am using gensim and am able to generate topics that make sense. Using 25k of documents, I can also print them using print_topics. ...
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14 views

how to get similary of unseen document with whole corpus

I have a trained lda model.now i want to find the new unseen document similarity with the corpus. ...
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14 views

How to Decide Topics For the Documents using LDA

I am trying to Classify Topics From Documents using LDA. I want to get topics classified as human classify from words, https://medium.com/mlreview/topic-modeling-with-scikit-learn-e80d33668730 https:...
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32 views

How can I categoriese / classify a cluster of words?

I am just wondering if it is possible to classify word clusters? For example if I provide you an array of words [bird,chicken,dock,park,apple,grapes,furits,juice] ...
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25 views

LDA as a dimensionality reducer [closed]

I know how to use LDA as a classifier. But how to use Linear Discriminant Analysis as a dimensionality reducer to reduce the number of features and apply logistic regression on top of it. I am using R ...
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1answer
205 views

Online vs Batch Learning in Latent Dirichlet Allocation using Scikit Learn

Reference: https://scikit-learn.org/stable/modules/generated/sklearn.decomposition.LatentDirichletAllocation.html I'm looking at the LDA algorithm from Scikit Learn for topic modeling. Can someone ...
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1answer
76 views

Apply Labeled LDA on large data

I'm using a dataset contains about 1.5M document. Each document comes with some keywords describing the topics of this document(Thus multi-labelled). Each document belongs to some authors(not just one ...
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1answer
754 views

How to Combine tfidf with LSTM in keras?

I am classifying emails as spam or ham using LSTM and some of its modified form(by adding constitutional layer at the end). For converting documents into vectors I am using keras.text_to_sequences ...
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I have data of some movies and their subtitles.I want to classify them based on their ratings

I will convert the subtitles into vectors and use them as features to classify the movies into different categories based on their ratings.The problem that I am facing is my feature vector is much ...
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49 views

Model Joint Probability of N Words Appearing Together in a Sentence

Assume that we have a large corpus of texts to train with. Given N words as input, I want to model the joint probability $p(x_1, x_2, ..., x_N)$ of these words appearing together in a sentence. More ...
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1answer
131 views

Predicting topics for customer reviews based on topics mapped to n-grams?

I have a large number of unlabelled customer review data(text column) and my objective is to classify each review to a particular topic. Also I have a list of unigrams,bigrams and trigrams(not a part ...
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1answer
740 views

How to give names/labels to topics in LDA [duplicate]

I want to give labels to different topics created using LDA. I don't want to do it manually. I saw some papers on automatic labeling but I am still confused. How can I use the information produced ...
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1answer
240 views

What's beyond topic modeling?

I tried topic modeling (LDA, NMF) to extract insights from the data. I'm curious right now, are there other methods for unsupervised learning to cluster documents by the same or similar context? (...
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1answer
242 views

Industrial application(s) of LDA (latent Dirichlet allocation)?

LDA ( Latent Dirichlet allocation) - is quite a popular topic in data-mining. Question What are the industrial systems using LDA or may be some related models ? (May be Google/Amazon/ ... ? ) PS I ...
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365 views

Flexible Discriminant Analysis

I am studying the book "Elements of Statistical Learning". In chapter 12 it is given about the Generalized Linear Discriminant Analysis. In one of its section it is about Flexible Discriminant ...
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1answer
491 views

How to compare the topic coherence between models of different number of topics?

If I'm not mistaken, in this paper here http://svn.aksw.org/papers/2015/WSDM_Topic_Evaluation/public.pdf it appears that topics with larger number of topics will inherently have larger coherence ...
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138 views

How to split natural language script into segments?

I have a bunch of .txt and .srt files extracted from a MOOC website, they are the scripts of the videos. I would like to segment the scripts into parts such that each part falls into one of the ...
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309 views

Why do we need the hyperparameters beta and alpha in LDA?

I'm trying to understand the technical part of Latent Dirichlet Allocation (LDA), but I have a few questions on my mind: First: Why do we need to add alpha and gamma every time we sample the equation ...
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318 views

Implementation of LDA (Latent Dirichlet Allocation) for classification tasks

Until now I have used LDA only for topic modelling. I would like to know which is the simplest implementation of LDA algorithm for classification tasks.
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33 views

Cluster algorithm to group events in more general domains

I've a list of 1,300 news events, represented by only three terms coming from running LDA topic model on thousands of tweets. Here's some of them as an example: ...
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2answers
282 views

Guided topic modeling: generating words from topics

I need to generate lists of words related to specific topics for a project. I am familiar with clustering methods of topic modeling such as LDA, but I have something else in mind. Are there any ...
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2answers
830 views

Sub topics with Latent Dirichlet Allocation

I'm training an LDA model with gensim's LdaMulticore. The topics look great, but knowing the domain I know there exists topics within topics but I'm not quite sure the best way to model this. I've ...
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2answers
457 views

Topic modeling for short length sentences

I have a graph which was already separated into clusters. Each node in the graph has a label (typically, it's a function's name like ...
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1answer
745 views

Can I use euclidean distance for Latent Dirichlet Allocation document similarity?

I have a Latent Dirichlet Allocation (LDA) model with $K$ topics trained on a corpus with $M$ documents. Due to my hyper parameter configurations, the output topic distributions for each document is ...
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538 views

Perplexity increasing on Test DataSet in LDA (Topic Modelling)

I was plotting the perplexity values on LDA models (R) by varying topic numbers. Already train and test corpus was created. Unfortunately, perplexity is increasing with increased number of topics on ...
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1answer
1k views

How to map topic to a document after topic modeling is done with LDA

Is there any way I can map generated topic from LDA to the list of documents and identify to which topic it belongs to ? I am interested in clustering documents using unsupervised learning and ...
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1answer
166 views

LDA vs Word2Vec vs Others for predicting recipients of a message

I'm investigating various NLP algorithms and tools to solve the following problem; NLP newbie here, so pardon my question if it's too basic. Let's say, I have a messaging app where users can send ...
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1answer
106 views

stable set PCA while adding features

Is it possible to have a PCA setup (or any other dimensionality reduction technique) in a way that adding new features wouldn't require retrain downstream models that were trained on that particular ...
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1answer
232 views

Equally sized topics in Latent Dirichlet allocation

I'm using the topicmodels package for R to cluster a big set of short texts (between 10-75 words) into topics. After manually reviewing a few models it seems like there are 20 realtivly stable topics. ...
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967 views

why the accuracy of LDA model is always changing and also is high

Let’s explain the whole goal firstly, then go through the question. I am using topic modeling like LAtent Dirichlet Allocation and NMF to extract the topic from a collection of documents. My dataset ...
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1k views

fitting classifier object of type 'int' has no len()

We have LDA topic modeling whose purpose is to generate a number of topics given a set of documents. So each document can belong to various topics. Also, we can evaluate the model we have created. ...
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2k views

Found array with dim 3. Estimator expected <= 2

I am using LDA over a simple collection of documents. My goal is to extract topics, then use the extracted topics as features to evaluate my model. I decided to use multinomial SVM as the evaluator. ...
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4k views

Why we should not feed LDA with tfidf

Can someone explain why we can not feed LDA topic model with TFIDF? What is wrong with this approach conceptually?
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1answer
2k views

Apply SVM on LDA in python

hope someone kindly put time here, my approach is like this: TFIDF -> LDA -> SVM I am using LDA to extract topics. I want to do topic modelling and use the topics as features to do document ...
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1answer
1k views

Words from LDA output pyspark machine learning

I built a pipeline for an LDA model using pyspark's machine learning. Here is my code: ...
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1answer
561 views

News topic detection and categorization

If I want to get how many and what kind of topics are covered by New York Times each week from a bag of words model(All the news covered by NYT in a week) how should I approach? Using traditional ...
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1answer
2k views

How to compare LDA and TF-IDF?

I am doing text mining to extract topics from documents. I started with Latent Dirichlet Allocation (LDA), which worked great, but then I came across TF-IDF with K-Means clustering, which worked ...
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2k views

Difference between LDA and Naive Bayes

LDA: linear discriminant analysis Suppose we have a classification problem. I understand that the data can be such that the features may have discrete values or continuous values. Suppose our data ...
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1answer
159 views

Quantifying the Reproducibility of LDA Models

I am working on a text mining project where I'm using Latent Dirichlet Allocation to study a corpus of documents. I'm currently in the process of optimizing my parameters to get the best models for my ...
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2answers
130 views

Proceeding with various methods for news recommendation

I am beginner in ML (i have done only Andrew Ng's ML course) and i have to work on news recommendation. I went through this paper which mentions different methods used for news recommendation (at 7th ...
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1answer
296 views

Determine document novelty/similarity with the aid of Latent Dirichlet allocation (LDA) or Named Entities

Given an index or database with a lot of (short) documents (~ 1 million), I am trying to do some kind of novelty detection for each newly incoming document. I know that I have to compute the ...