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Questions tagged [naive-bayes-algorithim]

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How to calculate true positive, true negative, false positive, negative and postive with Bayes Classifer from scratch

I am working on implementing a Naive Bayes Classification algorithm. I have a method def prob_continous_value which is supposed to return the probability density ...
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Naive Bayes unable to detect preprocessing techniques from data

I'm testing out different preprocessing techniques on mulit-class classification problems. I've used multiple algorithms, but the only algorithm that giving me trouble is Naive Bayes. ...
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1 answer
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Stop words list to use for CountVectorization

The sci-kit learn library by defaults provides two options either no stop words or one can specify stop_words=english to include a list of predefined English words I am using Naive Bayes for SMS spam ...
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1 answer
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Comparison of different Naive Bayes algorithm for SMS classification

There are various types of Naive Bayes algorithms in the Sklearn library: Can all of them be used for text classifications? And which one's perform bette I tested out a simple text classification ...
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What type of 'Naive Bayes' algorithm is provided by Orange?

I've been using Orange for a while to rapidly prototype a few classification models. One of the ones I've been using is 'Naive Bayes'. If I understand correctly, there are a few types available based ...
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2 votes
1 answer
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Really confused with characteristics of Naive Bayes classifiers?

Naive Bayes classifiers have the following characteristics-: They are robust to isolated noise points because such points are averaged out when estimating contiditional probabilities from data. Naive ...
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1 vote
2 answers
75 views

Independence of Features assumption in Naive Bayes

How do we know if your features in my dataset are independent before applying Naive Bayes? Basically I want to know is it possible for us to get an idea before training our model if Naive Bayes will ...
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1 answer
47 views

Subtraction of Positive and Negative Frequencies in Sentiment Analysis

In the Positive Negative Sentiment Analysis, Would it make sense mathematically to instead of keeping a score of the positive frequencies and negative frequencies of a word, calculate the difference ...
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2 votes
1 answer
466 views

How to improve results from a Naive Bayes algorithm?

I am having some difficulties in improving results from running a Naive Bayes algorithm. My dataset consists of 39 columns (some categorical, some numerical). However I only considered the main ...
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1 answer
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Why naive bayes is "naive"

Some articles say that naive Bayes is naive because of "independence of attributes". Whereas others say "independence of attributes within a class". Can anybody please clear this ...
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1 vote
1 answer
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How does the Naive Bayes algorithm function effectively as a classifier, despite the assumptions of conditional indpendence and bag of words?

Naive Bayes algorithm used for text classification relies on 2 assumptions to make it computationally speedy: Bag of Words assumption: the position of words is not considered Conditional Independence:...
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1 vote
3 answers
611 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 a huge set of documents for ex above 1 Lakh and when I am ...
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