The MEDLINE N-gram Set 2015: by Split, Group, Filter, and Combine Algorithm
The MEDLINE n-gram set (generated by split, group, filter, and combine algorithm) is listed as bellows. For each MEDLINE record, title and abstract are used as the source of n-grams. They are combined, tokenized into sentences, and then tokenized into tokens (words use space as word boundary). Finally, n-grams are generated by filtering out terms with more than 50 characters or the total word count is less than 30. The specifications of generating these n-grams are listed as follows:
Document count | Word count | N-gram |
Download:
N-grams | File | Zip Size | Actual Size | No. of n-grams |
---|---|---|---|---|
Unigrams | 1-gram.2015.tgz | 5.7MB | 14MB | 843,206 |
Bigrams | 2-gram.2015.tgz | 35MB | 103MB | 4,845,965 |
Trigrams | 3-gram.2015.tgz | 52MB | 171MB | 6,702,194 |
Four-grams | 4-gram.2015.tgz | 35MB | 123MB | 4,082,612 |
Five-grams | 5-gram.2015.tgz | 17MB | 59MB | 1,674,715 |
N-gram Set | nGramSet.2015.30.tgz | 143MB | 467MB | 18,148,692 |
Distilled N-gram Set | distilledNGram.2015.tgz | 55MB | 176MB | 6,793,561 |