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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Errno 32 Broken pipe, Gensim Error, NMF

I am using Gensim 4.1.2 and trying to build a topic model using NMF. I am finding optimum number of topics using Coherence score. However when I am trying to get coherence values using get_coherence(),...
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7 views

Browser history segmentation

I'm trying to segment a browser history into semantically coherent sessions. For example, a user might be working on a school project for 30 minutes, then planning an upcoming vacation for 30 minutes, ...
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60 views

How does amazon's reviews that mention extracts topics from reviews?

Amazon product page contains a section called Reviews that mention. The section lists the main things that users liked or dislike about the product. For example see ...
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29 views

Creating a Sentiment dictionary from scratch

I am analyzing Arabic textual data from a social media forum discussing economic issues such as labor unions. I am using a package that classifies as negative, positive, or neutral. For instance, the ...
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23 views

Latent Dirichlet Allocation (LDA) importance of document generation and Gibbs Sampling

I am having trouble finding the correlation between the two seemingly uncorrelated parts of LDA. What I understood from several videos is: There is a document generation "part", which is ...
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Updating a genism LDA model with new documents and topics

I have a conceptual problem that is related to a project I'm working on. I'm relatively new to the domain of NLP so this might be a poor question but I would really appreciate any help. My dataset is ...
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22 views

Topic modelling on long documents: intra document clustering first

I have a collection (around 1000) of very noisy, similar documents, that are each very long (>10 pages - 600 paragraphs) with multiple subsections - I want to perform topic modelling across the ...
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1answer
26 views

Diachronic topic modeling with chaning set of topics

In short, the question is: how can I build a regularly updated chain of topics which would also show how topics emerge and disappear over time? To be more precise: I have a data with timestamps ...
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11 views

Understanding the usage of variational methods in LDA

I'm reading a research paper on LDA. My goal is to understand the difference between variational methods and sampling algorithms. The specific article review that I am reading is: I would like help ...
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NLP Data Reduction With Similarity Detection

I'm trying to use natural language processing to categorize transaction data. Ultimately I want to create labels for transactions (topic modeling). For example: Transaction Description Label "...
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14 views

Choice of the number of topics (clusters) in textual data

I have a social science background and I'm doing a text mining project. I'm looking for advice about the choice of the number of topics/clusters when analyzing textual data. In particular, I'm ...
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18 views

Measuring coherence score for Top2Vec models

I am working on creating a number of Top2Vec models on Reddit threads. I am basically changing the HDBScan cluster sizes to get different clusters of the Doc2Vec embeddings representing a different # ...
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11 views

How to interpret different coherence values

For an experiment with topic models, I have calculated four coherence values using Gensim's implementation: c_v u_mass c_uci c_npmi From this paper, I know that c_v correlates mostly with human ...
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1answer
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In scikit-learn's LDA implementation, how can I sort the topics by frequency over the entire corpus?

I've used scikit-learn to perform LDA topic modeling, and I'd ultimately like to sort the topics by saliency/frequency over the entire corpus, but I'm unsure how to do as such. I've used pyldavis ...
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25 views

NLP for recognising abstract concepts

I know that NLP algorithms can be trained to recognise the topic of a document or part of a document. I would like to train an algorithm to recognise certain abstract concepts. For example I want to ...
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21 views

LSA Model Improvement

I followed gensim's Core Tutorial and build an LSA Classification, topic modeling and Document Similarity model for newsgroups dataset. My code is available here. I need help with below 3 concepts. ...
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45 views

Measuring Topic-coherence score & optimal number of topics in LDA Topic Modeling in Orange data mining

I'm trying to build an Orange workflow to perform LDA topic modeling for analyzing a text corpus (.CSV dataset). Unfortunately, the LDA widget in Orange lacks for advanced settings when comparing it ...
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18 views

Modeling of topics orthogonal to a given patterns

How to force the topics to be different from the defined ones? Suppose I have a collection of texts about cats and dogs.There should naturally be two topics: one about dogs and one about cats. But I'm ...
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Evaluate Topic Modelling on synthetic data

I try to find the optimal number of topics on a synthetic corpus (so a list of lists of tokens I generate using various parameters). I, therefore, know the true number of topics and the true topics ...
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186 views

Best Python NLP library for supervised topic classification

I have a labeled dataset that I have ingested into a dataframe. It consists of news articles, ...
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162 views

Calculating optimal number of topics for topic modeling (LDA)

am going to do topic modeling via LDA. I run my commands to see the optimal number of topics. The output was as follows: It is a bit different from any other plots that I have ever seen. Do you think ...
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31 views

Do weights of keywords for each topic add up to 1 in topic modeling?

When you run a topic modeling (say LDA), you can get outputs for some number of topics with corresponding keywords and their weights. Based on my understanding, people usually output top 10 or top 20 ...
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45 views

Addressing polysemy in NLP tasks

Looking for modern algorithms using NN Language Model implementations addressing polysemy in NLP tasks, including text classification, question answering and topic modeling. Transfer/Zero-short ...
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43 views

Cluster images labels in some given categories using word embeddings

Given: set of images Labels in string format each one. Also I've given a set of Categories, also in string. ($Images \neq Categories $) Goal: I need to map given labels to given categories to "...
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38 views

What does updated alpha mean in LDA model?

I'm trying to understand LDA model by reading through implementations of the algorithm. Many implementations update alpha during training iterations with codes like: ...
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9 views

Topic Assginment via correlation

I have an uncleaned text field something like Apple Juice xxx Newyork .. Store and an assigned topic Juice Centre. What are ...
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200 views

How to measure the Optimal-number of Topics & Topic-Coherence score in Orange's LDA Topic-Modeling?

I'm trying to build a suitable "code-free" Topic Model in "Orange Data Mining" software for the experimental part of my Thesis, in order to analyze the themes and trends of ...
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Vector dimensionality seems to be implemented incorrectly

I'm trying to implement a fuzzy topic modeling approach in Python based on a paper, which is accommodated with an R implementation from GitHub. In one of the first steps a document term matrix is ...
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How does LDA model do inference on new documents?

Through Latent Dirichlet Allocation (LDA) one can learn topics from texts. The trained topic model can then be used on unseen data to infer to what extent each of the learned topics are represented in ...
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59 views

LDA topic model has 0-weight topics, is that normal?

While experimenting with different number of topics for the Gensim implementation of LDA, I found that for a high number of topics, the output often consists of topics with all weights equal to zero. ...
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Best measure to indicate quality of LDA model

On my corpora, I am running LDA with different settings (I experiment with different number of topics, different different ngrams and TFIDF or regular BOW). Now, I want to rank these setups to select ...
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23 views

Extract keywords from set of similar sentences by using python

I have a list of similar sentences, and I would like to automatically extract top-n important keywords [single word length] from a whole set of those sentences by using python. These sentences are ...
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36 views

Self-supervised learning for automatic labeling of data using LDA and Word2Vec

I am trying to implement this paper A Brand-New Look at You: Predicting Brand Personality in Social Media Networks with Machine Learning for labeling Twitter data of brands with a corresponding brand ...
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1answer
66 views

Topic modelling with many synonyms - how to extract 'latent themes'

Here's my corpus ...
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1answer
401 views

Get most likely topic per document in pandas dataframe using gensim

I am using gensim LDA to build a topic model for a bunch of documents that I have stored in a pandas data frame. Once the model is built, I can call ...
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1answer
35 views

Tweet Classification into topics- What to do with data

Good evening, First of all, I want to apologize if the title is misleading. I have a dataset made of around 60000 tweets, their date and time as well as the username. I need to classify them into ...
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72 views

How to compare topics generated from topic modeling from different datasets?

I have two datasets of a similar theme. Let's assume Dataset A and Dataset B. Using the top2vec model (https://github.com/ddangelov/Top2Vec) (https://arxiv.org/abs/2008.09470) on each dataset, I came ...
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71 views

Classify tweets by topic [closed]

I am approaching machine learning for the first time because of my studies. I have been given a bunch of tweets and the goal is to classify them per topic. I really have no clue on how this should be ...
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37 views

Use KL divergence to label topics from LDA

I have used sklearn's sklearn.decomposition.LatentDirichletAllocation module to model 10 topics in a set of documents. I have also used the same on a reference text (1 document) and obtained a 1 topic ...
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1answer
37 views

Twitter Data-Analyse: What can I do with the data?

I retrieve data to a specific topic from Twitter and did my sentiment analysis on it. I never did anything in NLP, etc. So what else can I do with that? "Main goal" would be to find out if ...
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45 views

Hierarchical dirichlet process results

I am thinking about using hierarchical dirichlet process to model a patent dataset. I've seen that HDP uses a base distribution and assumes that every topic comes from that base distribution. The ...
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1answer
34 views

Which tool is good to collect tweets on 50 keywords over the last 5 years and then analyze them with the LDA algorithm or sentiment analysis?

I want to find tweets from the last 5 years to a topic. For this I decide for 50 Keywords (related to the main topic), where I want to find data on Twitter. I want to find out how the trend on the ...
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754 views

TF-IDF for Topic Modeling

Can TF-IDF be used a sole method for Topic Modeling ? (I know there are better methods like LDA , LSA etc) I just want to understand if TF-IDF alone can help us in Topic modeling . If yes , can ...
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490 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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30 views

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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208 views

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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96 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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1answer
54 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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83 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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72 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 ...