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1 BGM 1,a) 2 2 BGM BGM BGM Label Spreading 1. BGM BGM *1 BGM 14 *2 Lonsdale 189 [1] 75.7% BGM BGM BGM BGM 1 1 College of Information Science, University of Tsukuba 2 National Institute of Advanced Industrial Science and Technology (AIST) a) hiromu@coins.tsukuba.ac.jp *1 * ,439 jp/tag/%e4%bd%9c%e6%a5%ad%e7%94%a8bgm 1 BGM 1

2 2. BGM Pampalk [2] ( 1 ) s s s a ( 2 ) s a > s s s a ( 3 ) s a > s s sa s s UniversalPlaylist [3] Yes No BGM BGM LISWO [4] LISWO Support Vector Regression 2.3 concentration [5 7] [5] [7] interruptibility [8 11] Fogarty [9] Züger [10] [11] Fogarty [9] Züger [10] % 32.5% [11] % Fogarty Züger 2 Züger confusion matrix 71.1% 58.4% 78.6% [7] [11] 3. BGM 1 BGM Huang [12] like very much like feel passably dislikedislike very much 5 Huang 2

3 BGM [13] BGM BGM Pampalk [2] Pampalk 2 2 A 3 2 B [14] 30 [14] Walkman *3 Songrium [15] [16,17] [7] *3 feature_4.html\#l1_170 3

4 2 A 2 B 3 C C HTTP/HTTPS Web 3 n-gram n-gram [18 21] Rieck [19] Windows API n-gram 3 [11] Firefox Web Skype PC Web 2 Google GET Web Twitter POST SNS Web 2 Crammer Adaptive Regularization of Weight Vectors AROW [22] AROW [21] 4.3 BGM Label Spreading Label Spreading [23] 3 Label Spreading Shao [24] Label Propagation [25] Label Spreading Label Propagation Wang [26] 4

5 2 Web n-gram key Google Chrome a key [] [ ] Google Chrome a key Microsoft Excel <[Ctrl: v]> Microsoft Excel Ctrl+v mouse Firefox 1 mouse [] [ ] Firefox / / 1 7 mouse Skype 4 Skype net GET HTTP/HTTPS net [] [ ] GET Web GET POST net POST twitter.com twitter.com POST Label Spreading Step 1) Step 2 Zhou [23] k- SVM Wells [27] % 4 ( 1 ) 2 ( 2 ) 3 ( a ) 5

6 情報処理学会研究報告 図 6 作業用 BGM 推薦システムの構成 左上部の再生 制御モ ジュールがインタフェース 図 5 を担い 他の 3 つのモジュー ルがバックグラウンドで動作する が誤り訂正を行った より精度の高いサビ区間情報を利用 できる可能性があるという点が挙げられる また 行動ログ収集モジュールでは キーボード マウス 図 5 作業用 BGM 推薦システムのインタフェース 上部の Songle への入力と Web 通信の記録を行う キーボード マウスへ Widget によって楽曲を再生し 下部の スキップ もっと の入力については selfspy*4 により アクティブなアプリ 聴く ボタンによってフィードバックを取得する ケーション名と共に記録し Web 通信は mitmproxy*5 を 用いて リクエストごとのメソッドとホスト名を記録する い という優先順位で選択する 集中度推定モジュールと楽曲推薦モジュールは 機械学 ( b ) 直前の楽曲を再生中 集中度が高いと推定された 習に基づく 2 つのモジュールである 前者は 行動ログか 場合は 楽曲群候補から 直前に再生した 1 曲と らの集中度の推定を行うもので 機械学習フレームワー の類似度が最大となるものを推薦する ク Jubatus*6 を利用した 後者は ユーザによるフィード ( c ) 直前の楽曲を再生中 集中度が低いと推定された バックや集中度から楽曲推薦を行うもので 機械学習ライ 場合は 楽曲群候補から 直前に再生した 2 曲と ブラリ scikit-learn*7 による Label Spreading の実装を用い の類似度の和が最小となるものを推薦する た また Songle Widget から通信できるようにするため ここで 集中度が低かった場合に 直前に再生した 1 曲 Tornado*8 を用いて WebSocket サーバ上に実装した との類似度のみを最小化すると 2 つのジャンルを交互に 行き来するような選択を繰り返してしまう可能性があるた め 直前に再生した 1 曲との類似度ではなく 2 曲まで考 慮して楽曲を選択することとした 5. 実装 本章では これまで述べた手法を実現する 作業用 BGM プライバシへの配慮として 行動ログはすべてハッシュ 化した上で保存し 通信はすべて暗号化した 6. 評価 本章では 集中度の推定精度 フィードバック手法の妥 当性 及び 推薦結果の妥当性の 3 つの項目について 評 価方法とその結果を述べる 推薦システムの実装について述べる ユーザインタフェースを図 5 に示す Songle Widget に 6.1 対象楽曲と音響特徴量の算出 よる楽曲再生画面に加え 一時停止 と 4.1 節で述べた スキップ もっと聴く の 3 種類のボタン そして音量 調節バーを持つ 対象とした楽曲は ニコニコ動画において VOCALOID タグを付与されている楽曲のうち 再生数が上位の 50 曲 6.5 節のみ 200 曲 とした ここで VOCALOID 楽曲を利 システムの構成は図 6 に示すように 再生 制御 行 用したのは Songle 上に多くの楽曲が登録されており ユー 動ログ収集 集中度推定 楽曲推薦の 4 つのモジュールを ザによる訂正を経たサビ区間情報が得やすいことと 様々な 持つ 中心となるのが 再生 制御モジュールで 他の 3 ジャンルの楽曲が CGM Consumer Generated Media 的 つと連携して得られた推薦楽曲を 埋め込みブラウザ内 *4 で動作する Songle Widget [28] を用いて再生する Songle *5 Widget を用いる利点としては サビ区間に基づく再生制 御が容易であるということに加え Songle [29] 内でユーザ 2016 Information Processing Society of Japan *6 *7 *

7 7 [30,31] VOCALOID VOCALOID *9 Songrium [15] MARSYAS [32] Likert fold cross validation % % confusion matrix Züger [10] % [9] 78.6% [10] * Wiki %A3%E3%81%AE%E3%82%BF%E3%82%B0%E4%B8%80%E8%A6%A , ,1 0-1, % [11] (p < 0.01) (p < 0.01)

8 BGM 4.3 Pampalk [2] [4] Pampalk [2] ( 1 ) s s s a ( 2 ) s a > s s s a ( 3 ) s a > s s sa s s ( 1 ) VOCALOID VOCAROCK VOCALOID ( 2 ) 200 ( 3 ) ( 4 ) 1 ( 5 ) 7 VOCAROCK VOCALOID (= ) VOCALOID

9 , BGM BGM BGM JST CREST [1] Lonsdale, A. J. and North, A. C.: Why do we listen to music? A uses and gratifications analysis, British Journal of Psychology, Vol. 102, No. 1, pp (2011). [2] Pampalk, E., Pohle, T. and Widmer, G.: Dynamic Playlist Generation Based on Skipping Behavior, ISMIR 2005, pp (2005). [3] UniversalPlaylist: 2005 pp (2005). [4] LISWO HCI Vol. 2009, No. 28, pp (2009). [5] Tateyama, Y., Matsumoto, Y. and Kagami, S.: Concentration detection by eye movements: towards supporting a human, Proc. of the IEEE Intl. Conf. on Systems, Man & Cybernetics, pp (2004). [6] Valentine Vol. 39, No. 5, pp (1998). [7] PC Vol. 2015, pp (2014). [8] Fogarty, J., Hudson, S. E. and Lai, J.: Examining the robustness of sensor-based statistical models of human interruptibility, CHI 2004, pp (2004). [9] Fogarty, J., Hudson, S. E., Atkeson, C. G., Avrahami, D., Forlizzi, J., Kiesler, S. B., Lee, J. C. and Yang, J.: Predicting human interruptibility with sensors, ACM Trans. Comput.-Hum. Interact., Vol. 12, No. 1, pp (2005). 9

10 [10] Züger, M. and Fritz, T.: Interruptibility of Software Developers and its Prediction Using Psycho-Physiological Sensors, CHI 2015, pp (2015). [11] Tanaka, T. and Fujita, K.: Study of user interruptibility estimation based on focused application switching, CSCW 2011, pp (2011). [12] Huang, R. H. and Shih, Y. N.: Effects of background music on concentration of workers, Work, Vol. 38, No. 4, pp (2011). [13] (1) Vol. 22, No. 6, pp (2007). [14] Goto, M.: A chorus section detection method for musical audio signals and its application to a music listening station, IEEE Trans. Audio, Speech & Language Processing, Vol. 14, No. 5, pp (2006). [15] Hamasaki, M. and Goto, M.: Songrium: a music browsing assistance service based on visualization of massive open collaboration within music content creation community, Proc. of the 9th Intl. Symposium on Open Collaboration, pp. 4:1 4:10 (2013). [16] Hamasaki, M., Goto, M. and Nakano, T.: Songrium: a music browsing assistance service with interactive visualization and exploration of protect a web of music, WWW 14, pp (2014). [17] Songrium RelayPlay: WISS 2015, pp (2015). [18] Firdausi, I., lim, C., Erwin, A. and Nugroho, A. S.: Analysis of Machine Learning Techniques Used in Behavior- Based Malware Detection, ACT 2010, pp (2010). [19] Rieck, K., Trinius, P., Willems, C. and Holz, T.: Automatic analysis of malware behavior using machine learning, Journal of Computer Security, Vol. 19, No. 4, pp (2011). [20] Canali, D., Lanzi, A., Balzarotti, D., Kruegel, C., Christodorescu, M. and Kirda, E.: A quantitative study of accuracy in system call-based malware detection, IS- STA 2012, pp (2012). [21] CSS2013 Vol. 2013, No. 4, pp (2013). [22] Crammer, K., Kulesza, A. and Dredze, M.: Adaptive regularization of weight vectors, Machine Learning, Vol. 91, No. 2, pp (2013). [23] Zhou, D., Bousquet, O., Lal, T. N., Weston, J. and Schölkopf, B.: Learning with Local and Global Consistency, NIPS 2003, pp (2003). [24] Shao, B., Ogihara, M., Wang, D. and Li, T.: Music Recommendation Based on Acoustic Features and User Access Patterns, IEEE Trans. Audio, Speech & Language Processing, Vol. 17, No. 8, pp (2009). [25] Zhu, X., Ghahramani, Z. and Lafferty, J. D.: Semi- Supervised Learning Using Gaussian Fields and Harmonic Functions, ICML 2003, pp (2003). [26] Wang, F., Li, T., Wang, G. and Zhang, C.: Semisupervised Classification Using Local and Global Regularization, AAAI 2008, pp (2008). [27] Wells, A.: Popular Music: Emotional Use and Management, The Journal of Popular Culture, Vol. 24, No. 1, pp (1990). [28] Goto, M., Yoshii, K. and Nakano, T.: Songle Widget: Making Animation and Physical Devices Synchronized with Music Videos on the Web, IEEE ISM 2015, pp (2015). [29] Goto, M., Yoshii, K., Fujihara, H., Mauch, M. and Nakano, T.: Songle: A Web Service for Active Music Listening Improved by User Contributions, ISMIR 2011, pp (2011). [30] Hamasaki, M., Takeda, H. and Nishimura, T.: Network analysis of massively collaborative creation of multimedia contents: case study of hatsune miku videos on nico nico douga, UXTV 2008, pp (2008). [31] CGM : 1. CGM Vol. 53, No. 5, pp (2012). [32] Tzanetakis, G. and Cook, P.: MARSYAS: a framework for audio analysis, Organised Sound, Vol. 4, pp (2000). 10

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