Hello, The stemmer algorithm implemented in OpenNLP is this one:
https://tartarus.org/martin/PorterStemmer/ Regarding the "null" lemma, are you using OpenNLP to lemmatize? Rodrigo On Fri, Jul 7, 2017 at 5:47 AM, Ling <lingv...@gmail.com> wrote: > I use it indirectly through another library, there is a function > token.getLemma(). > > On Jul 6, 2017 7:24 PM, "John Stewart" <cane.c...@gmail.com> wrote: > >> I'm asking because I thought there are no pre-trained models for the >> lemmatizer. How are you using it exactly? There's also an option to use a >> dictionary, e.g. >> https://stackoverflow.com/questions/38982423/opennlp-lemmatization-example >> >> AFAIK the models in 1.8.1 are the same as 1.5.3 >> >> jds >> >> On Thu, Jul 6, 2017 at 6:26 PM, Ling <lingv...@gmail.com> wrote: >> >> > The openNLP1.5.3. I will update to 1.8.1 version after this week, if it's >> > an issue due to old models. >> > >> > Thanks. >> > >> > On Thu, Jul 6, 2017 at 3:19 PM, John Stewart <cane.c...@gmail.com> >> wrote: >> > >> > > What model or dictionary are you using with the lemmatizer? >> > > >> > > jds >> > > >> > > On Thu, Jul 6, 2017 at 6:05 PM, Ling <lingv...@gmail.com> wrote: >> > > >> > > > Hi, the problem with lemma is that, for "tmoble", the lemma returned >> by >> > > > openNLP is "null", not "tmoble". >> > > > >> > > > Why is it? >> > > > >> > > > On Mon, Jul 3, 2017 at 6:54 PM, Rakesh P <rakeshbe...@gmail.com> >> > wrote: >> > > > >> > > > > Hi, >> > > > > Stemmer works based on some predefined rules. Examples for rules >> are >> > > > "word >> > > > > that ends with 'e'". So, if you want to get a meaning word after >> > > > > preprocessing, then better use lemmatization. >> > > > > >> > > > > Regards, >> > > > > Rakesh P >> > > > > >> > > > > > On 03-Jul-2017, at 10:24 PM, Ling <marlon...@gmail.com> wrote: >> > > > > > >> > > > > > Hi, I noticed that some words are stemmed like the following: >> > > > > > >> > > > > > iphone -> iphon >> > > > > > tmobile -> T-mobil >> > > > > > >> > > > > > Is there some parameter to control this behavior? In such cases, >> > > those >> > > > > > stems are actually harmful, making them become unknown words in >> > text. >> > > > > Since >> > > > > > these are quite common, I am just curious whether there is a way >> to >> > > > > change >> > > > > > the default behavior. >> > > > > > >> > > > > > Thanks. >> > > > > > Ling >> > > > > >> > > > >> > > >> > >>
