elasticsearch - how edge ngram token filter differs from ngram token filter? -


as new elastic search, not able identify difference between ngram token filter , edge ngram token filter.

how these 2 differ each other in processing tokens?

i think documentation pretty clear on this:

this tokenizer similar ngram keeps n-grams start @ beginning of token.

and best example ngram tokenizer again comes documentation:

curl 'localhost:9200/test/_analyze?pretty=1&analyzer=my_ngram_analyzer' -d 'fc schalke 04'       # fc, sc, sch, ch, cha, ha, hal, al, alk, lk, lke, ke, 04

with tokenizer definition:

                    "type" : "ngram",                     "min_gram" : "2",                     "max_gram" : "3",                     "token_chars": [ "letter", "digit" ]

in short:

  • the tokenizer, depending on configuration, create tokens. in example: fc, schalke, 04.
  • ngram generates groups of characters of minimum min_gram size , maximum max_gram size input text. basically, tokens split small chunks , each chunk anchored on character (it doesn't matter character is, of them create chunks).
  • edgengram same chunks start beginning of each token. basically, chunks anchored @ beginning of tokens.

for same text above, edgengram generates this: fc, sc, sch, scha, schal, 04. every "word" in text considered , every "word" first character starting point (f fc, s schalke , 0 04).


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

jquery - javascript onscroll fade same class but with different div -

i new @ javascript , want learn new. there wrong code : why div fades @ same time. i want ask how fade different div s same class name.can me , explain me. thanks in advance. javascript: $(window).scroll(function(){ if ($( "div.fade" ).offset().top - $(window).scrolltop() <= 100){ $('.fade').addclass( "fade-in"); } else { $('.fade').removeclass("fade-in"); } }); here jsfiddle onscroll = function () { var scrolltop = $(this).scrolltop() ; $("div.fade").each(function(){ if(($(this).offset().top - scrolltop) <= 100){ $(this).toggleclass("fade-in"); } }) }
Read more