[Topic-models] Troubleshooting Johnathan Chang's R-LDA Package

Shivani Rao sgrao at purdue.edu
Tue Jan 4 16:32:35 EST 2011

I found this strange error in R-lda package, while doing query inference.

For a given LDAmodel (on the corpus), dicitonary of words = myDict,  I
extract the following

topics <- LDAmodel$topics * 1000000
storage.mode(topics) <-"integer"   # done to ensure that the matrix is an
integer matrix
topic_sums <- LDAmodel$topicsums  *1000000
storage.mode(topic_sums) <-"integer" # done to ensure that the matrix is an
integer matrix

then run the LD model, for the queries docs_test

Querymodel <-
= list(topics = topics,topic_sums = topic_sums))

I get the following error

Error in structure(.Call("collapsedGibbsSampler", documents, as.integer(K),
Counts became negative for word (241): (4, -2147482775, 2)
 n storage.mode(topics) <- "integer" : NAs introduced by coercion

Any clue as to why this is happening?


Research Scholar,
School of Electrical and Computer Engineering
Purdue University
West Lafayette IN
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