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From Antonio Calò <anton.c...@gmail.com>
Subject Re: Frequency Term of Composite words
Date Thu, 17 Dec 2009 11:47:15 GMT
Hi Rao.

thanks for your suggestion. I'll try this way too!

Ragards

Antonio

2009/12/17 Antonio Calò <anton.calo@gmail.com>

> Hi Ted. yes, your assumption are correct.
>
> If lucene save position and offset, I should find a way to get occurrence
> of a multiword term. I'll let you know. I'll write some code to understand
> if this is the optimum way.
>
> Many thanks & regards
>
> Antonio
>
> 2009/12/17 André Warnier <aw@ice-sa.com>
>
> Antonio Calň wrote:
>>
>>> Hi Ted.
>>>
>>> Thank you very much for your feedback.
>>>
>>> I can see the term frequency for each term, but not fo couples or more
>>> term
>>> togheter.
>>>
>>> An example: "the quick brown fox jumps over the lazy dog. But the big dog
>>> was sleeping.So The lazy dog didn't see the fox"
>>>
>>> So, with your suggestion I'm able to find that tf("dog") = 2,
>>> tf("fox")=3,... (the terms are composed by  just a word).
>>>
>>> But it seems that TermFrequencyVector cannot answer to this: tf("lazy
>>> dog")=2, tf("quick brown")=1.
>>>
>>> Unlikely I've been asked to retrieve the occurrence of a set of concept
>>> in a
>>> document and I was trying to use lucene cause my simple mapping algorithm
>>> is
>>> too slow :(.
>>>
>>> I'll try to see if I can do something with TermFreqVector, or with the
>>> Analizer. OR I'll go to look for another way :)
>>>
>>> Antonio
>>>
>>>
>>>
>>> 2009/12/16 Ted Dunning <ted.dunning@gmail.com>
>>>
>>>  You need the term frequency vector.
>>>>
>>>> See here
>>>>
>>>>
>>>> http://lucene.apache.org/java/2_4_1/api/org/apache/lucene/index/IndexReader.html#getTermFreqVector%28int,%20java.lang.String%29
>>>>
>>>> This is compatible in 3.0 as well:
>>>>
>>>>
>>>> http://lucene.apache.org/java/3_0_0/api/core/org/apache/lucene/index/IndexReader.html#getTermFreqVector%28int,%20java.lang.String%29
>>>>
>>>> Note the package change.
>>>>
>>>>
>>>> On Wed, Dec 16, 2009 at 7:34 AM, Antonio Calň <anton.calo@gmail.com>
>>>>
>>>> wrote:
>>>>
>>>>  I All
>>>>>
>>>>> I Hope that you can help me on this.
>>>>>
>>>>> I'm looking for a fast way to obtainf for a given word, its term
>>>>>
>>>> frequency
>>>>
>>>>> (I mean how many times it is available in a single doc). I've looking
>>>>>
>>>> into
>>>>
>>>>> mail archive and LIA (Lucene In Action) book and I found something like
>>>>> this:
>>>>>
>>>>> IndexSearcher index = new IndexSearcher(invertedIndexinRam);
>>>>> Term term = new Term("doc", "quick");
>>>>> int occurrence = index.docFreq(term);
>>>>>
>>>>> ok, occurrence contains the occurrences of the word "quick" into the
>>>>>
>>>> index
>>>>
>>>>> (In my case the index will contain only one document example "the quick
>>>>> brown fox jumps over the lazy dog"). In this case the occurrence will
>>>>> be
>>>>>
>>>> 1.
>>>>
>>>>> :)
>>>>>
>>>>> But now I need to retrieve the occurrency of a composite word: as
>>>>> example
>>>>> "quick brown fox" but I'm quite in trouble on how could I perform this.
>>>>>
>>>>>  I haven't even really started to use Lucene yet, but I follow this
>> list.
>> So just an unqualified idea :
>> - assuming each word is indexed, along with its position in each item
>> - assuming that you kept all the words, and did not strip out "stop words"
>> - assuming that you have the list of items which contain all of the words
>> composing your multi-word term
>> - then you should be able to determine which items contain
>>  word 1 of your term in position n
>>  word 2 of your term in position n+1
>>  etc..
>>
>>
>
>
> --
> Antonio Calò
> ------------------------------------------
> Software Developer Engineer
> @ Intellisemantic
> Mail anton.calo@gmail.com
> Tel. 011-56.90.429
> ------------------------------------------
>



-- 
Antonio Calò
------------------------------------------
Software Developer Engineer
@ Intellisemantic
Mail anton.calo@gmail.com
Tel. 011-56.90.429
------------------------------------------

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