本文選題：推薦系統(tǒng) + 實時推薦　； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：現(xiàn)有的職位推薦系統(tǒng)主要通過智能檢索、簡歷匹配、用戶相似性和定時推送等方法推薦,然而已有職位推薦方法主要基于用戶的歷史偏好,未考慮用戶行為變化對求職偏好的影響且無法根據(jù)該變化及時響應(yīng)其最新的求職動向,導(dǎo)致推薦實時性差。另外,現(xiàn)有基于用戶的職位協(xié)同推薦主要采用默認值處理職位評分矩陣的缺失值,未考慮用戶對職位的偏好差異,降低了相似性計算質(zhì)量且該方法缺乏考慮用戶的特定需求,如對薪資或?qū)W歷等屬性的要求,導(dǎo)致推薦的可靠性不高。針對上述問題,提出了基于用戶動態(tài)行為變化的職位實時推薦方法。通過監(jiān)聽用戶操作事件,判斷用戶是否發(fā)生添加或更新求職意愿信息和點擊其他職位的行為變化,及時發(fā)現(xiàn)其最新的求職動向并產(chǎn)生推薦,從而解決推薦實時性差的問題。此外,提出了基于職位評分預(yù)測的協(xié)同推薦算法。在現(xiàn)有UserCF算法基礎(chǔ)上,對缺失的職位評分進行預(yù)測填充處理,提升相似性計算質(zhì)量并對結(jié)果進行過濾,從而提高推薦可靠性。論文主要工作如下:(1)系統(tǒng)需求分析和總體設(shè)計。為能夠及時發(fā)現(xiàn)用戶最新求職動向并推薦可靠的職位,采用了包括數(shù)據(jù)層、推薦算法層和應(yīng)用層的總體架構(gòu)。為獲取職位資源和用戶偏好信息,數(shù)據(jù)層需采集職位信息和用戶行為數(shù)據(jù)。為向用戶推薦可靠的職位,推薦算法層需利用采集的用戶行為數(shù)據(jù),訓(xùn)練職位推薦算法,以構(gòu)建用戶求職偏好模型。為向用戶展示職位推薦信息,應(yīng)用層需提供前臺交互頁面,及時響應(yīng)用戶操作。因此,系統(tǒng)按照功能劃分為數(shù)據(jù)采集模塊、職位推薦模塊和前臺頁面交互模塊。(2)系統(tǒng)詳細設(shè)計。針對數(shù)據(jù)采集模塊,采用職位爬蟲抓取網(wǎng)絡(luò)職位數(shù)據(jù)和利用數(shù)據(jù)庫或消息隊列保存用戶行為數(shù)據(jù)。根據(jù)不同的推薦邏輯,將職位推薦模塊分為職位實時推薦和職位協(xié)同推薦兩子模塊。針對職位實時推薦,采用消息隊列保存用戶最新的行為事件消息,當用戶發(fā)生添加或更新求職意愿和點擊職位的行為時,通過監(jiān)聽消息隊列的事件消息變化,分別觸發(fā)在線職位匹配推薦和在線職位關(guān)聯(lián)推薦,以提高推薦的實時性。針對職位協(xié)同推薦,采用預(yù)測值填充職位評分矩陣的缺失值,提升相似性質(zhì)量,基于此,計算協(xié)同推薦結(jié)果并對其過濾,以提高推薦的可靠性。前臺頁面交互模塊基于響應(yīng)式布局的方法設(shè)計頁面,以提高推薦響應(yīng)效率。(3)系統(tǒng)實現(xiàn)與測試。系統(tǒng)基于J2EE實現(xiàn)。職位實時推薦通過Storm實現(xiàn)并利用Flume和Kafka收集和緩存事件日志;職位協(xié)同推薦通過Mahout實現(xiàn)。由測試結(jié)果可知系統(tǒng)能夠及時向用戶推薦可靠的職位。此外,在對職位評分矩陣的缺失值進行預(yù)測填充后,協(xié)同推薦在準確率和召回率上平均提升35%和40%。
[Abstract]:The existing job recommendation systems are mainly recommended by intelligent retrieval, resume matching, user similarity and timing push. However, the existing job recommendation methods are mainly based on users' historical preferences. Without considering the influence of user behavior change on job search preference and unable to respond to the latest job search trend according to this change, the recommendation real-time performance is poor. In addition, the default value is mainly used to deal with the missing value of the position score matrix, which does not take into account the difference of the user's preference to the position, which reduces the quality of similarity calculation and does not take into account the specific needs of the users. Such as salary or academic qualifications such as attribute requirements, resulting in recommendation reliability is not high. In order to solve the above problems, a real-time job recommendation method based on user dynamic behavior change is proposed. By monitoring the user's operation events, we can judge whether the user's behavior changes in adding or updating the job seeking intention information and clicking on other positions, and find out the latest job search trend and produce the recommendation in time, so as to solve the problem of poor real-time recommendation. In addition, a collaborative recommendation algorithm based on job score prediction is proposed. Based on the existing UserCF algorithm, the missing job score is predicted and filled, the similarity calculation quality is improved and the results are filtered to improve the reliability of the recommendation. The main work of this paper is as follows: 1) system requirement analysis and overall design. In order to find out the latest job trends of users and recommend reliable positions in time, an overall framework including data layer, recommendation algorithm layer and application layer is adopted. In order to obtain position resource and user preference information, the data layer needs to collect position information and user behavior data. In order to recommend reliable positions to users, the recommendation algorithm layer needs to use the collected user behavior data and train the position recommendation algorithm to build a job preference model. In order to display the position recommendation information to the user, the application layer should provide the front desk interactive page and respond to the user operation in time. Therefore, the system is divided into data acquisition module, position recommendation module and front page interaction module. For the data acquisition module, the position crawler is used to grab the network position data and the database or message queue is used to save the user behavior data. According to the different recommendation logic, the position recommendation module is divided into two sub-modules: real time recommendation and collaborative recommendation. For post recommendation, message queue is used to save the latest behavior event message of user. When the behavior of adding or updating job search will and clicking on position occurs, the event message changes in message queue are monitored. The online position matching recommendation and the online position correlation recommendation are triggered respectively to improve the real-time performance of the recommendation. In order to improve the reliability of the job recommendation, the prediction value is used to fill the missing value of the position score matrix to improve the similarity quality. Based on this, the collaborative recommendation results are calculated and filtered. The front page interaction module designs the page based on the method of response layout to improve the efficiency of recommendation response. The system is implemented based on J2EE. Real time job recommendation is implemented by Storm, event log is collected and cached by Flume and Kafka, and post collaborative recommendation is implemented by Mahout. Test results show that the system can recommend reliable positions to users in time. In addition, after filling in the missing value of the position score matrix, the cooperative recommendation increased the accuracy and recall by an average of 35% and 40%.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP391.3

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