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Does anyone know how the sonnetsCounts.mat file was created on the following MATLAB page: https://uk.mathworks.com/help/textanalytics/ref/ldamodel.predict.html
Predict Top LDA Topics of Word Count Matrix
Load the example data. sonnetsCounts.mat contains a matrix of word counts and a corresponding vocabulary of preprocessed versions of Shakespeare's sonnets.
load sonnetsCounts.mat
size(counts)
ans = 1×2
154 3092
When I open the sonnetsCounts.mat file, it has the following data
val =
(1,1) 1
(106,1) 1
(131,1) 2
(154,1) 1
(1,2) 1
(143,2) 1
I presume the second column in the frequency of words. But I'm not sure if the vector in the first column represents two words?
Peter

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Walter Roberson
Walter Roberson 2018-12-24
编辑：Walter Roberson 2018-12-24

0 个投票

The counts is a sparse matrix.
(143,2) 1
means that sonnet #143, unique word #2, had a count of 1.

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Peter Mayhew
Peter Mayhew 2018-12-26
编辑：Peter Mayhew 2018-12-26
Thanks Walter for your response, I've spent more time looking into this since your reply.
Would I be correct in saying that the sonnet sparse matrix would be created using the encode command. i.e. encode(bag,documents)
Peter
Walter Roberson
Walter Roberson 2018-12-26
No. It is the Counts property of the bag directly not the result of encoding an additional document against the bag.
Peter Mayhew
Peter Mayhew 2018-12-26
编辑：Peter Mayhew 2018-12-26
OK, so if I understand correctly. I would perform the following command
bag = bagOfWords(documents);
Then check the counts property of variable bag.
Walter Roberson
Walter Roberson 2018-12-26
Counts with a capital C, but Yes.

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