Ζησόπουλος Γεώργιος 6647

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    18-Jan-2017
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Transcript of Ζησόπουλος Γεώργιος 6647

PowerPoint

: 6647 : .

Social media

Twitter 140 310 500 tweets Top10 sites

: 2

+1 +

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Web Scraping5

Web Scraping6 HTML

Web Scraping7 HTML

Web Scraping

8 Document

9

Named EntitiesStanford NER

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Proper Nounsarktweetnlp

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Adjective - NounStanford POS Tagger

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Noun SequencesStanford POS Tagger

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NounsStanford POS Tagger

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Noun PhrasesOenNLPTagger

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KeywordsJsoup16

17 Document

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queriesThree Spanish journalists were released after being abducted around Aleppo, Syria, and held hostage by the Al-Nusra Front since 13 July 2015."july" AND "abducted""spanish journalists" AND "aleppo""july" AND "al-nusra""spanish journalists" AND "abducted""july" AND "front""spanish journalists" AND "al-nusra""journalists" AND "aleppo""aleppo" AND "13 july""journalists" AND "13 july""aleppo" AND "abducted""journalists" AND "al-nusra""abducted" AND "al-nusra""aleppo syria" AND "spanish journalists""abducted" AND "front""aleppo syria" AND "abducted""abducted" AND "13 july"

19 Queries

term1 AND term1

term1 term2 term3 AND term1

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Twitter REST API Java Library Twitter4jTweets 7 450 requests / 15min

PagingNo RetweetsLanguage : English

Tweets

21News Date# NewsAverage Queries/NewsAverage Tweets/NewsDB Size06/05/201612464,760328444.98 MB08/05/201611101,5736855.92 MB

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Apache Lucene 5.5.0Inverted index

Indexing

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25Information Retrieval

Vector Space Model26

27Lucene Scoring

BM25 . tf idf27

28Language models

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PRF; :1 IR (Pseudo) Relevance Set (Pseudo) Relevance Set (Pseudo) Relevance Feedback29Pseudo-Relevance Feedback

30Relevance Models

tweets31

*******TFIDFBM25AverageMaxscoreSumAverageMaxscoreSum10.950.95111120.750.9010.900.951311111140.950.90111150.85110.9011611111170.60110.951180.200.200.450.250.300.60911111110111111110.100.100.100.100.100.10Average Precision0.7640.8240.8680.8270.8500.882

tweets32

#TweetRelevant1travelling to Taif, Saudi ArabiaNo2Trophee Hassan Policeman Killed in Shootout With MilitantsYes3Saudi policeman killed in shootout with militants: Saudi Arabia says a policeman was killed in a shootout with https://t.co/p2cY4KWocmYes4Saudi Policeman Killed in Shootout With Militants: Saudi Arabia says a policeman was killed in a shootout wit... https://t.co/BxP885EDBQYes5Saudi Policeman Killed in Shootout With Militants: Saudi Arabia says a policeman was killed in a shootout with https://t.co/lB1ePd2lcvYes6Saudi policeman killed in shootout with militants - Saudi Arabia says a policeman was killed in a shootout with... https://t.co/iORDNawewqYes7Saudi Policeman Killed in Shootout With Militants - Saudi Arabia says a policeman was killed in a shootout with... https://t.co/iM6gzcyTGSYes8Saudi Policeman Killed in Shootout With Militants: Saudi Arabia says a policeman was killed in a shootout with militants in the weste...Yes9#Rainbow over #Taif, #Saudi, the weather!No10Saudi Arabia says a policeman was killed in a shootout with militants in the western city of Taif Yes

tweetsA policeman is killed in a shootout with militants in Taif, Saudi Arabia.

TFIDF,MAXSCORE

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tweets : AllTweets: tweets : tweetsK: AllTweetsSimilar: tweets : FilTweets: Top 100 tweets duplicates: = 1 = 1FilTweets[N] = AllTweets[K] = +1Similar = i 1 CosSim( AllTweets[K] , FilTweets[i] ) > 0,5 Similar = __ Similar == FilTweets[N]=AllTweets[K]_{