Questions tagged [tfidf]

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12 views

Which would be an ideal model to get a specific sub string from a bigger string?

I have a corpus of documents whose some lines have information like this: wt 210 1b 14.4 oz (98 kg) or ...
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1answer
15 views

Why does using a standard scalar on my tf idf matrix make it perform better?

I have a tf-idf matrix transformed on a list of tweets from a data set i am using. I have a pipeline where i initiate a StandardScalar and then next have my SVM with a linear kernel and auto gamma as ...
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11 views

Is normalizing term weight necessary when cosine similarity is used in retrieval?

When using cosine similarity in information retrieval, document vector length and query vector length are used for normalization. So if TF-IDF is used as a weighting function, then using raw frequency ...
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10 views

Can a term weighting function used in text retrieval be compared to one used in text classification?

I came up with a modified version of TF-IDF function for text retrieval task. I want to do retrieval experiments using Vector Space Model and compare my function to some of those proposed in the ...
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14 views

The TF-IDF is not matching with the bags of words

I am creating the information gains of all the words present in the vocabulary. However, when I check for feature names of the vectorizer it is different. For bag of words I am using: ...
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10 views

Building simple documents search engine

I'm having my first steps in the NLP and at the moment I'm looking forward to building my own documents search engine. I've already got to know with TFIDF in practical way and I've also read about ...
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1answer
31 views

Comparing TFIDF vectors of different shapes

I'm working on a project using TF-IDF vectors and agglomerative clustering -- the idea is that the corpus of documents increases over time, and when a new document is added, the mean cosine similarity ...
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1answer
19 views

Why I would use TF-IDF after Bag-of-Words (CountVectorizer)?

In my recent studies over Machine Learning NLP tasks I found this very nice tutorial teaching how to build your first text classifier: https://towardsdatascience.com/machine-learning-nlp-text-...
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11 views

SKLEARN SGDClassifier prediction accuracy hint?

There is a function predict but is it possible to also hint how much is the predicted category probable? Like prediction of category 1 with 90% confidence, or 2 with 30% confidence etc. Without this I ...
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1answer
42 views

SKLEARN GridSearchCV hinting higher accuracy than Pipeline but with same parameters as Pipeline estimators

I have pipeline estimators like this: ...
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22 views

Text Analysis : Recommendation to identify cause of loss from claim narrative documents

I am trying to analyze auto claims narrative documents which contain description about the accident usually free text written by claims executives. Is there a nlp technique I could use to identify ...
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1answer
38 views

Ordering of standardization, pca, and/or tfidf for neural network

I have 60k rows of text data. I have tokenized it into 55k columns. I am using a neural network to classify the data but have some questions about how to order my preprocessing steps. I have too much ...
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1answer
31 views

Is it good practice to remove the numeric values from the text data during preprocessing?

Im doing preprocessing on a text dataset. I have certain numerics in it like: date(1st July) year(2019) tentative values (3-5 years/ 10+ advantages). unique values (room no 31/ user rank 45) ...
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3answers
92 views

How to process the hyphenated english words for any nlp problem?

Im doing preprocessing on english text dataset. I encounter hyphenated words like 'well-known'. Will it be useful if I remove the hyphen as special character and treat it as a single word 'wellknown' ...
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1answer
116 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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13 views

Manually tune tf-idf features in document classification

I am working on a multi-label document classification task with a very small data set (180 labeled documents) and a fairly large number of labels (20). I found that - ignoring label correlations and ...
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22 views

TF-IDF Transform duplicating data

I'm working on a Sentiment Analysis task using TF-IDF to build my features and SVC as the classifier. My goal is to make my model to classify the sentiment of all my dataset. I already designed my ...
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1answer
21 views

Word representation that gives more weight to terms frequent in corpus?

The tf-idf discounts the words that appear in a lot of documents in the corpus. I am constructing an anomaly detection text classification algorithm that is trained only on valid documents. Later I ...
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1answer
20 views

How does TF-IDF classify a document based on “Score” alloted to each word

I understand how TF-IDF "score" is calculated for each word in a document, but I do not get how can it be used to classify a test document. For example, if the word "Mobile" occurs ...
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1answer
75 views

How to handle unseen labels in test data?

I get something like TF-IDF of training corpus in python with (something like) TfidfVectorizer. In test data some features (here are the words of test corpus, every word is a feature) are not seen in ...
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57 views

TFIDF and TFIDF weighted W2V with Multinomial Naive Bayes?

Although the tfidf vectors don't really follow Multinomial Distribution, yet MultinomialNB works fairly well, why is it so? Also would weighted tfidf w2v work the same way or should I use GaussianNB ...
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0answers
21 views

How best to embed large and noisy documents

I have a large corpus of documents (web pages) collected from various sites of around 10k-30k chars each, I am processing them to extract relevant text as much as possible, but they are never perfect. ...
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1answer
26 views

How come same cluster category be separated?

I have these 200 vectors which were clustered using K-means clustering based on keywords weight similarity that was given by TF-IDF (Term Frequency - Inverse Document Frequency). The vectors were ...
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2answers
28 views

Is it accurate to say that “K-means clustering the vectors based on keywords weight similarity”?

Long story short, I have 200 vectors as a result of TF-IDF (Term Frequency - Inverse Document Frequency) on thousands of keywords in hundreds of vectors. The total number of unique keywords that I got ...
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0answers
30 views

How to properly vectorise when I have several text features?

I am having several features as text and I'm using them once for a classification problem and then later for a regression problem. The textual data features themselves aren't categorical. Because as ...
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0answers
33 views

SKLearn NearestCentroidClassifier score with predict_proba

I'm using the NearestCentroidClassifier combined with TF-IDF for classification of documents. The are linked to a growing number of document groups. I've set sklearns TfIdfVectorizer and the ...
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1answer
159 views

What is the formula and log base for idf?

To calculate tf-idf, we do: tf*idf tf=number of times word occurs in document What is formula for idf and log base: Log(number of documents/number of documents containing the word) Log((1+number ...
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12 views

Using kernel estimation to find similarity/difference between two feature sets for binary classification

I am trying to train a binary classifier using word vectors. I have the tfidf vectors for each sentence in my training set. Before applying binary classification algorithms, I just want to check ...
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0answers
20 views

Topic alignment / topic modelling

What is the most efficient method for detecting whether the article is mostly about a specific topic, but without lots of data for training? My task is to determine how much a document is e.g. about ...
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27 views

Training a cosine similarity matrix for similar text recommendation

I'm working on similar movie names recommender system. I have a dataset of only movie_titles that I converted into matrix using tfidf and then computed the cosine ...
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15 views

Should I create a tfidf on a subset of a data set or use the whole corpus?

My goal in this project is to see if businesses on a list are currently customers within my organization. One piece of this involves producing a similarity score using cosine similarity on the names ...
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32 views

Semi-Supervised Learning using NLP

I am working on a drug reaction problem in which I need to extract tweets and label the tweets (binary-reaction due to drug or not). But since I don't have domain knowledge, and clustering would also ...
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1answer
22 views

Text vectorizer that capture feature offset in the text?

I'm using sklearn Tfifdfvectorizer to extract feature from text towards text classification. I believe the information I need tends to be in the beginning of the document, so I would like to somehow ...
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22 views

Calculating only document frequency or only term frequency from TF-IDF

I have a large corpus of documents (multiple sentences per document), and am trying to find words that appear in some majority of documents (to then filter them out of a future analysis). Since I'm ...
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1answer
21 views

Solution for TF-IDF Vectorization in Angular project?

While making an Angular project to use my text-classification model on unseen data, i struggle in finding a way how to transform text to TFIDF features. Anyone faced same issue? Maybe a solution on ...
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0answers
780 views

ValueError: Found input variables with inconsistent numbers of samples: [2, 44] [closed]

Have a piece of code where i am cleaning the text from the 'Description' column and storing it as "cleaned" Then i create a ML model using the above as one of my features. ...
2
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1answer
2k views

Word2Vec and Tf-idf how to combine them

I'm currently working in text mining ptoject I'd like to know once I'm on vectorisation. With method is better. Is it Word2Vec or ...
1
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1answer
294 views

Using TF-IDF for feature extraction in Sentiment Analysis

I am working on sentiment analysis for twitter data, for which I have used Vader to get an approximation of sentiment for a tweet. Along with, I have used TF-IDF for feature extraction. These feature ...
1
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1answer
301 views

Unable to save the TF-IDF vectorizer

I'm workig on multi-label classification problem. I'm facing issue while saving the TF-IDf verctorizer and as well as model using both pickle and joblib packages. Below is the code: ...
2
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1answer
55 views

Dealing with low-information centroids using Nearest Centroid Classifier and bag of words method

I am currently working on a problem where we have projects and e-mails that belong to a single project each. My goal is to create a recommendation system for incoming e-mails which presents the ...
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1answer
2k views

How to choose the best parameter values for TfidfVectorizer in sklearn library?

Recently, I used TfidfVectorizer in scikit-learn library to calculate a matrix of TF-IDF features. However, I do not know how to set some parameters such as ...
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3answers
72 views

How to approach TF-IDf based analysis?

Problem statement : We have documents with list of words in them. Overall these documents are classified into 2 group (say, good quality vs bad) docs - ...
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1answer
35 views

CV(Curriculum vitae) Recommendation System guidance

I am building a recommender system which matches people's CV with a vacancy. So far, I used TF-IDF & Cosine Similarity to get a matching score between a vacancy and a candidate's CV. I want to ...
2
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1answer
177 views

How to extract keywords from a list of URLs?

I have a bunch of URLs in a text file like- ...
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3answers
34 views

Vectorize One line text data

How to vectorize one-line text data? I have used tf-idf including bigrams and trigrams but I am not able to get good results. I have purchase order descriptions which are one-liners and I need to ...
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46 views

Setting a threshold for tfidf

Let's say I have streaming textual data coming in. I run named entity recognition software to capture the entities, then I score them using tf-idf. Tf-idf scores are unbounded positively. How can I ...
4
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1answer
374 views

TS-SS and Cosine similarity among text documents using TF-IDF in Python

A common way of calculating the cosine similarity between text based documents is to calculate tf-idf and then calculating the linear kernel of the tf-idf matrix. TF-IDF matrix is calculated using ...
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3answers
2k views

Are stopwords helpful when using tf-idf features for document classification?

I have documents of pure natural language text. Those documents are rather short; e.g. 20 - 200 words. I want to classify them. A typical representation is a bag of words (BoW). The drawback of BoW ...
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1answer
46 views

Why is TF IDF output lognormal?

I ran a TF IDF algorithm and the result of predicted similarities using cosine similarity is a log-normal distribution. Is this a feature of the algorithm (e.g., all logit probabilities are log-...