Questions tagged [tfidf]

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2
votes
1answer
34 views

How to extract keywords from a list of URLs?

I have a bunch of URLs in a text file like- ...
0
votes
2answers
17 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 ...
1
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0answers
10 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
votes
1answer
67 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 ...
2
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3answers
64 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 ...
0
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1answer
24 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-...
2
votes
1answer
72 views

Why is the result of CountVectorizer * TfidfVectorizer.idf_ different from TfidfVectorizer.fit_transform()?

I have a dataframe: df = pd.DataFrame({'docs': ['gamma alfa beta beta epsilon', 'beta gamma eta',], 'labels': ['alfa alfa beta', 'gamma fi']}) I use count ...
0
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1answer
61 views

How to implement HashingVectorizer in multinomial naive bayes algorithim

I had used TfidfVectorizer and passed it through MultinomialNB for document classification, It was working fine. But now I need to pass huge set of documents for ex above 1 Lakh and when I am trying ...
0
votes
1answer
26 views

TF-IDF: How to handle terms not part of the corpus

I'm working on a ML.Net based feature to extract keywords from a document corpus using TD-IDF. Given this test corpus (one document per line): ...
-1
votes
1answer
50 views

Word Embeddings with TFIDF vectorizer

I am a beginner in machine learning. I have a large corpus of texts, divided into thematic groups. I would like to get idf values for the whole corpus, and then apply it on each group before ...
2
votes
3answers
49 views

TFIDF for very short sentences

I'm trying to build a regression model, in which one of the features contains text data. I was thinking in using scikit-learn's ...
1
vote
1answer
24 views

Given two large corpora of text from different sources, is there an accepted way to get differences in vocabulary (n-grams) between them?

Given two large corpora of text from different sources, is there an accepted way to get differences in vocabulary (n-grams) between them? That is, to get results which say that, for example, the ...
1
vote
1answer
25 views

How do we decide on the classification algorithm to use with huge training size?

I am solving a questions binary classification problem and the training size for this is huge(291 billion). The data has bloated because of using tfidfvectorizerfor ...
0
votes
1answer
117 views

How to combine nlp and numeric data for a linear regression problem

I'm very new to data science (this is my hello world project), and I have a data set made up of a combination of review text and numerical data such as number of tables. There is also a column for ...
2
votes
1answer
25 views

Predicting probability for each tag given already chosen tags

I have a set of tags (~10'000, will be extended over time) presented to a user. After he has selected 3 or more tags, I want to predict for each remaining tag what the chances are that the user will ...
0
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0answers
196 views

CNN with TF-IDF

I'm currently working on a text classification project and want to try convolutional neural network for this. As far as I have read about text classification with CNN only word embeddings (like ...
0
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0answers
76 views

Document similarity over years: TF-IDF Word2Vec, gensim

I have two documents one at time $t$ and the other at time $t+1$. I individually calculate the TF-IDF of both documents and store my results into a document term matrix. I can load both the document ...
1
vote
1answer
28 views

Checking TF-IDF Results

I am working with TF-IDF and cosine similarity to do document comparisons and given a document, which document in the data is the most similar. However, sometimes it returns a high similarity between ...
1
vote
1answer
118 views

Does it make sense to use TF-IDF to extract most important tokens from a corpus?

I have a collection of documents and I'd like to extract the most important words and phrases from the entire corpus. My understanding of TF-IDF is that it is calculated per token per document, so ...
2
votes
1answer
83 views

TF-IDF vs TF for classification

Let's suppose that I have a dataset of 1000 documents. Each document is a restaurant review (so relatively short text) and it has labels {Negative, Indifferent, Positive}. Let's suppose that the ...
1
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0answers
56 views

SVM/Naive Bayesian text classification on multiple features

I was building a text classifier which takes into account certain features of the text and classifies them into two - "Yes" or "No". I have trimmed the text, removed stopwords and have applied TFIDF ...
0
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1answer
449 views

why does transform from tfidf vectorizer (sklearn) not work

I'm transforming a text in tf-idf from sklearn. I made the model: ...
0
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1answer
252 views

Will a Count vectorizer ever perform (slightly) better than tf-idf?

For the task of binary classification, I have a small data-set of a total 1000 texts (~590 positive and ~401 negative instances). With a training set of 800 and test set of 200, I get a (slightly) ...
0
votes
3answers
130 views

How do I use TF*IDF scores for my machine learning model?

I have applied TF*IDF on the 'Ad-topic line' column of my dataset. For every ad-topic line, I get the same output: Firstly, I am unable to make sense of the output. The TF*IDF values are mentioned to ...
0
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0answers
20 views

TDIF toarray() returns an array of zeros

radius = tvec.fit_transform(test_df.Tweet_lemmatized) c = tvec.get_feature_names() print(radius) This returns the correct values, but when I try to convert it to ...
1
vote
1answer
20 views

Use prediction as feature for a decision tree

I'm working at classifying documents according to their content. First I built a decision tree model that gives 90% of goods results. Then I tried a TFIDF/SVC approach which also gives 90% of good ...
1
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0answers
84 views

My naive (ha!) Gaussian Naive Bayes classifier is too slow

I am trying to build a film review classifier where I determine if a given review is positive or negative (w/ Python). I'm trying to avoid any other ML libraries so that I can better understand the ...
1
vote
2answers
95 views

How to use vectors produced by TF-IDF as an input for fuzzy c-means?

I have done text processing with TF-IDF method and as an output got a list of normalized vectors [0, 1] for each document. Such as below: ...
1
vote
1answer
68 views

Algorithm for document retrieval in QA system

I am working with question answering and machine reading comprehension system. I want to match questions and documents (around 100,000 docs) in database. I've used tf-idf but it accuracy is about 55% ...
0
votes
1answer
1k 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 ...
0
votes
1answer
135 views

Assigning a new document to a cluster based on keywords extracted and tf-idf

I have about 40 clusters of documents defined by a combination of k-means clustering algorithm and hand curation. For example, some of the clusters given by k-means are too noisy so they have been ...
0
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2answers
49 views

Is this a good approach to classify tickets which contains description and logs?

I want to classify a dataset of support tickets which mostly contain text in the description field and sometimes server logs in a separate field. The log field is not always there but when it's ...
2
votes
0answers
231 views

Mixing Textual Data and Numerical Data (Neural Network)

I have 2 "nature" of data (more actually if I count images data) : Textual (that I treat with special tokenization and a TfIdfVectorizer) ~ 5000 features Non textual (like length of sentences, # of ...
4
votes
1answer
1k views

TF-IDF Features vs Embedding Layer

Have you guys tried to compare the performance of TF-IDF features* with a shallow neural network classifier vs a deep neural network models like an RNN that has an embedding layer with word embedding ...
2
votes
1answer
64 views

Predict the corresponding value in one column using a list of values found in another column

Please have a look at this link. This was a question I asked few months back and after some suggestions and exploring I was able to successfully use TFIDF along with MultinomialNB classifier to pretty ...
2
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0answers
349 views

Alternate of TF-IDF

I had used TF-IDF for text similarity but the results were not so good. I tried to implement google universal encoding (tensorflow hub). The results were satisfactory but not upto the mark. Is there ...
3
votes
1answer
739 views

Should I rescale tfidf features?

I have a dataset which contains both text and numeric features. I have encoded the text ones using the TfidfVectorizer from sklearn. I would now like to apply logistic regression to the resulting ...
1
vote
0answers
28 views

Predicting a new document [closed]

I have a document, (purchase agreement) of approx. 100 pages. This document is sent from buyer to seller several times, and each time there is a negotiation. Negotiation could be anything. For eg. ...
2
votes
1answer
2k views

Why TF-IDF is working with Sentiment Analysis?

Word2vec looks excellent to me as representation of corpus for sentiment analysis. It has relations between words etc. TF-IDF has only weight of the word how important it is. Results with sentiment ...
2
votes
0answers
250 views

DBSMOTE on Short Text Classification

I am trying to use DBSMOTE(Density-Based Synthetic Oversampling TEqnique) to on a data set of short text--tweets to be specific. This will be used to train a classifier model in a multiclass ...
5
votes
2answers
114 views

Online news classification

I am performing an online news classification. The idea is to recognize group of news of the same topic. My algorithm has these steps: 1) I go through a group of feeds from news sites and I recognize ...
9
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2answers
15k views

Word2Vec embeddings with TF-IDF

When you train the word2vec model (using for instance, gensim) you supply a list of words/sentences. But there does not seem to be a way to specify weights for the words calculated for instance using ...
0
votes
1answer
114 views

KDE on TF-IDF - sensitive bandwidth

I'm clustering texts based on TF-IDF features and DBSCAN (density based), and trying to rank points based on their 'belonging' to the cluster. Since my clustering is density based and my points can ...
1
vote
2answers
5k views

Sklearn tfidf vectorize returns different shape after fit_transform()

I'm new to ML and trying out basic samples using sklearn. I have achieved converting text (single dimension) to numbers using TF-IDF and got the predictions correct. Now I have a different use-case ...
1
vote
1answer
555 views

What affect will replacing words with bigrams have on TfIDF?

Say I have a corpus of text documents on which I have calculated each documents TfIDF vector. With this sparse matrix representation of the corpus, I can calculate similarities between documents by ...
1
vote
2answers
732 views

Idf values of English words

I'm working on keyword/phrase extraction from a single document. I started by doing term frequency analysis, but this returns words like "new" which aren't very helpful. So I want to penalize the ...
2
votes
1answer
3k views

Weighted sum of word vectors for document similarity

I have trained a word2vec model on a corpus of documents. I then compute the term frequency (the same Tf in TfIDF) of each word in each document, multiply each words Tf by its corresponding word ...
-1
votes
1answer
977 views

How to get relevancy score of a term with respect to text/document

I am working on the literature documents. I am able to identify important entities using NER and Ontologies. Now I will like to assign the relevance score to the identified entities with respect to ...
2
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0answers
522 views

TF-IDF Augmented Frequency vs Cosine Normalization

I am using TF-IDF for text classification and have been curious about the following two concepts. The augmented term frequency which is basically used for weighting in order to eliminate the bias ...
7
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2answers
9k views

Using TF-IDF with other features in SKLearn

What is the best/correct way to combine text analysis with other features? For example, I have a dataset with some text but also other features/categories. SKlearn's TF-IDF vectoriser transforms text ...