Questions tagged [topic-model]

A topic model describes text from a large corpus as a probability distribution over topics which are probability distributions over words. There are quantified contributions from all topics to a specific text.

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19 views

Automatic topic labelling for topic modelling

I am just curious to know if there is a way to automatically get the lables for the topics in Topic modelling. It would be really helpful if there's any python implementation of it.
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Differerent ways to detect the appropriate number of topics

I implemet the LDA topic modeling in R. One essential parameter is the selection of the number of topics Which of the following ways could it be the most suitable: ...
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13 views

Is there a way to find difference between topics in two languages using nlp

I want to analyse queries and their differences between two different languages English and Spanish in this case. I'm aware about topic modelling. I'm in search of any corpus available or any ...
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9 views

How to improve text classification using topic modeling feature vector?

I have a binary text classification problem. I am using the topic model(LDA) trained on Wikipedia to get the feature vectors to classify documents. I have tried Logistic Regression, Random Forest, ...
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Intuition of LDA

Can anyone explain how the LDA-topic model assigns words to topics? I understand the generative property of the LDA model but how does the model recognize that "Labrador" and "dog" are similar words/ ...
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30 views

How to identify topic transition in consecutive sentences using Python?

I'm new to data mining. I want to detect topic transition among consecutive sentences. For instance, I have a paragraph (this could be a collection of dozens of sentences, sometimes without ...
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24 views

Topic Similarity Measure | Multi-class Text Classification Model

I am trying to build a multi class text-classifier that classifies whether the tweet belongs to one of the categories ( Advise or Science or others ) let the input be any tweet like this , Input : <...
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38 views

Trying to use term document matrix as input to orange 3

I have a CSV file that has tokens as columns and documents as rows, where the rest of the cells are ints that represent term frequency. I'm trying to use this as input into Orange 3, but Orange 3 ...
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18 views

How to perform topic modelling on query search results

How can I model topics in the results returned by a search engine with higher weightage to documents ranked higher in the result set? The use case that I am looking at involves extracting the most ...
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Topic Modelling LDA - Small dataset

I'm trying to analyze a corpus of 100 texts with the topic modelling widget of Orange using LDA algorithm. When I increase the number of topics, they repeat themselves so I have in output some ...
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33 views

What does online learning mean in Topic modeling (LDA) - Gensim

I came across this line in the Gensim Documentation- Gensim LDA - "The model can also be updated with new documents for online training." So my assumption on what it means is - 'Once we have a ...
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Reaching 100% accurray in Data Mining

I am currently working with Topic Models, especially LDA, and now I am asking myself if it's possible to reach total accurracy regarding the results. If I insepct the results of my Topic Model, the ...
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Topic modelling on only 24 documents gives the same “topic” for any K

Description: I have 24 documents, each one of around 2.5K tokens. They are public speeches. My text preprocessing pipeline is a generic one, including punctuation removal, expansion of English ...
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Would Topic Modelling be classified as NLP or NLU?

I recently started my journey into the world of NLP, it's been one heck of a ride. I'm currently trying to understand whether topic modelling would be considered as NLP or NLU. Initially I would ...
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38 views

Topic models for non-textual data?

I am looking to employ an unsupervised clustering on a dataset where each observation has a mix of textual and non-textual features. For each observation, I combine the features into a single vector ...
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Searching for ressource recommendations (books,papers) to validate the results of a Topic Model (LDA)?

Hi I am building a Topic Model Process with Python. To do this I am using the LDA. However I am having trouble to determine the ideal amount of topics. Currently I am using the CoherenceModel ...
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563 views

Datasets for Topic Modeling [closed]

I'm looking to try and use deep learning methods for topic modeling as opposed to the more traditional methods of lda and word embedding methods. However, I'm having trouble finding good labeled ...
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59 views

Clustering Small Text Descriptions

Im presented with a unique text classification problem. Im given a list of descriptions each containing 3-8 words. I know that there are some descriptions that are nearly the same, but the majority ...
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Differnt loglikelihood values in RandomSearch/GridSearch and LDA . How to synchronize them?

I am doing a sensitivity analysis for some lda parameters in python. This is what I want to do: -Do RandomSearch to find optimal Parameters and therefore the optimal lda model. As Validation measure ...
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Latent Dirichlet Allocation in R, topicmodels using VEM algorithm or Gibbs Sampling mixing tm and topicmodels library or WarpLDA from text2vec?

If I am trying to classify 230k text abstracts, which option would be better and more precise when aplying LDA?
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Obtain Document-Topic matrix from NMF

I recently used NMF model provided by SkLearn to obtain Topics and terms under it. SKlearn provided the following code in their documentation: ''' Get Words in the topics def print_top_words(model, ...
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Assign Topic to a document after LDA

I executed my LDA and now I have several topics with their word distributions. How do I assign each document to a topic? Is Euclidean distance a good choice? Or there are other methods? Thanks
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Same topics appearing multiple times in a NMF model

I am using NMF (Non-negative Matrix factorization) module from Scikit learn to extract 100 topics from a corpus. In contrast to LDA, the output of NMF modeling includes some of the topics multiple ...
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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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75 views

how to calculate coherence score in topic model

I am trying to calculate coherence score in topic modeling. I am following this Github link So there I need to use the preprocessed wiki and news. I got 3 questions: if the domain that I have ...
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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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33 views

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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31 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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98 views

Hotel Booking Analytics: Perform an analysis in order to understand the movement of the price as the day approaches the check-in date

I am working on a hotel booking dataset. I have transactional level booking data, where each row corresponds to a booking. Please refer to below snippet of the data: I am trying to find out the ...
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43 views

Representation options of strings (keywords/topics) in models

What are all the possible ways to represent keywords in a machine learning model? The two I am aware of are: one hot encoding, using a static index. vector representation, using an embedding layer. ...
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Determining topic of text

I was wondering what I should be looking into if I want to measure the similarity between a paragraph and a corpus of text. For example, given a paragraph of text and the entire corpus of Data ...
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33 views

Topic Modelling

New to python - topic modelling, trying to include bigrams in preprocessing Had done the following, ...
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1answer
150 views

Find specific topics with topic modelling

I am looking for a way to classifiy text automatically by specific topics, i don´t have labeled data. Is this a possible/usual method of achieving this? If not, what would be better? Topic Modelling ...
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34 views

Which approach to select category based on keywords

I want to assign a certain category to a group of keywords. So i.e. people can upload images or videos, when they do this they can set keywords for this. These keywords are free to type so words can ...
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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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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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40 views

Classify documents using a set of known vocabularies

I have a bunch of documents that I want to classify which ones talk about soccer (unsupervised learning, I do not want to manually label the documents). One way I am thinking about is to go online ...
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How to find out the subject of an email (in the form of a sentence) or a pdf document in NLP using Python

How to find out the subject of an email (in the form of a sentence) or a pdf document in NLP using Python. If I do topic modelling and get different groups of topic, how do I pick out the only topic ...
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1answer
571 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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1k views

NLP algorithms for categorizing a list of words with specific topics

Currently I am using LDA to apply topic modeling to a corpus. Since LDA is unsupervised, it returns a set of words for a given 'topic' but doesn't necessarily specify the topic itself. I was wondering ...
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313 views

Is it correct to create topic models using both train and test data?

I have a dataset of text documents splitted into train and test sets. My task is a binary classification, classifying these documents to either 1 or -1. I have already computed some features using TF-...
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53 views

Topic Segmentation - should it be done in Raw, TfIdf or Semantic Space?

Let's assume we have a collection of documents and wish to perform some unsupervised topic segmentation. As always, we will perform some preprocessing (including tokenization, accent-removal, ...
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1answer
1k 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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2answers
331 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
18k views

Resume Parsing - extracting skills from resume using Machine Learning

I am trying to extract a skill set of an employee from his/her resume. I have resumes stored as plain text in Database. I do not have predefined skills in this case. How should I approach this problem?...
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63 views

Evaluating the result of topic modeling in a way that time matters

I have run different topic modeling approach on my data(its clinical data related to Cognitive impairment diseases. we are going to process what thing is important that make it develop to more harsh ...
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39 views

How to build News Tagging model(s)

I am trying to build a news tagging system. Given a piece of news article, find 5-6 key terms from the news article that best describe the article. Refer to the image below from google news. What are ...
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597 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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246 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 ...