發(fā)布時間：2019-05-10 19:07

【摘要】：隨著網(wǎng)絡視頻爆發(fā)式增長,在線視頻服務資源面臨著嚴重過載,準確預測視頻播放量對供應商而言越來越重要。論文通過對實際在線視頻服務系統(tǒng)所采集的海量數(shù)據(jù)研究,針對視頻放映的不同時間段,分為上映前的精準預測和上映后的同步預測二個階段:1)視頻上映前,針對傳統(tǒng)預測模型分類和預測效果不佳、規(guī)則化較多和缺乏實際應用價值等問題,提出一種基于深度信念網(wǎng)絡(Deep Belief Networks,DBNs)的視頻播放量預測方法。首先,結合社交網(wǎng)絡的關注度和視頻關鍵詞的搜索熱度,對影響因子進行建模和量化處理;其次,根據(jù)輸入和輸出變量確定DBNs各層網(wǎng)絡的結構,優(yōu)化網(wǎng)絡參數(shù)和預測模型;最后,利用在線視頻服務商的數(shù)據(jù)對深度信念網(wǎng)絡進行訓練,并多次交叉實驗對比分析,結果表明基于DBNs方法在視頻播放量預測準確率上有較大提升,有效實現(xiàn)了視頻播放量的早期預測。2)視頻上映后,通過對在線視頻早期播放量時序的統(tǒng)計分析,提出一種基于ARMA模型的視頻播放量預測方法,同步預測視頻未來某天的播放量。根據(jù)視頻播放量時序特征的差異性選擇不同的預測模型,模型在對非平穩(wěn)的國內(nèi)視頻和季節(jié)性明顯的國外視頻日播放量的同步預測獲得了較高精確度,相比傳統(tǒng)的移動平均法、指數(shù)平滑法和最小二乘法的預測方法獲得了明顯的提升,具有實際的參考價值。通過對深度信念網(wǎng)絡和時間序列模型的研究,本文實現(xiàn)了在不同時間階段對視頻播放量進行及時、持續(xù)、準確的預測,既能為視頻上映前的投資、評估提供較全面可靠的參考決策;又能夠得到上映后未來時間點精確的播放量波動范圍,為設計合理的廣告投放、資源存儲和商業(yè)決策提供支持。
[Abstract]:With the explosive growth of online video, online video service resources are facing serious overload, so accurate prediction of video playback is becoming more and more important for suppliers. Based on the research of massive data collected by the actual online video service system, this paper is divided into two stages: accurate prediction before release and synchronous prediction after release according to the different time periods of video screening: 1) before the release of video, In order to solve the problems of poor classification and prediction effect of traditional prediction model, more regularity and lack of practical application value, a video playback prediction method based on deep belief network (Deep Belief Networks,DBNs) is proposed. Firstly, the influence factors are modeled and quantified according to the attention of social network and the search heat of video keywords. Secondly, the structure of each layer of DBNs network is determined according to the input and output variables, and the network parameters and prediction model are optimized. Finally, the data of online video service providers are used to train the deep belief network, and many cross experiments are compared and analyzed. The results show that the accuracy of video playback prediction based on DBNs method is greatly improved. The early prediction of video playback is effectively realized. 2) after video release, through the statistical analysis of the timing of online video early playback, a video playback prediction method based on ARMA model is proposed. Synchronously predict the amount of video to be played one day in the future. According to the difference of time series characteristics of video playback, different prediction models are selected. The model obtains higher accuracy in the synchronous prediction of non-stationary domestic video and seasonally obvious foreign video daily broadcast volume, compared with the traditional moving average method. The prediction methods of exponential smoothing method and least square method have been improved obviously and have practical reference value. Through the research of deep belief network and time series model, this paper realizes the timely, continuous and accurate prediction of video playback at different time stages, which can not only invest in video before release. The evaluation provides a more comprehensive and reliable reference decision; It can also get the accurate fluctuation range of broadcast volume at the future time point after release, and provide support for the design of reasonable advertising, resource storage and business decisions.
【學位授予單位】：深圳大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TP391.41

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