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KDDCUP2015_Seed71_Kaggle_tokyo
1.
2016/3/5 KEI HARADA (キャッシュ)
2.
某データ分析企業勤務 Twitter
: @cash_FEG 何でも不器用にこなし、特に数学が得意 ◦ 数理学博士 ◦ Project Euler(2013ごろはガチ勢だった) ◦ KDDCUP(2011-) 2015は2位になった! ITLeadersに連載してます 2016も頑張ります ◦ Kaggle Masterではない @Keiku先輩に先を越された ◦ 統計あんまりよくわからないけど統計検定1級とってきた 仕事はSASメインだけど、R/Pythonも使う ◦ Rが好き Rcpp, Shiny, Rmarkdownあたりが特に好き、Rstudio最高
3.
開始直後にTOP5入り ◦ ばらばらに活動して独立な特徴量を増やす
みんな集まったら、そのうち暫定1位になった ◦ その後3位まで落ちる ◦ 優勝チームのいう”Magic Feature”で1位返り咲き ◦ Seedを71にしたらスコア向上、突き放した 終了28時間前に優勝チームに抜かれる
4.
Seed71の素晴らしさについて世界に発信してきた
5.
チーム組んでコンペ参加するとたのしいぞう ソロ活動メインの皆さんもぜひ!
6.
アイディアが増える ◦ 一発目のサブミットが大コケすると心が折れる
チームの誰かが成功すればよい ◦ 特徴量のアイディアが増える 作業する手が増える ◦ アンサンブルモデルではもろに差が出る ◦ 最後は力勝負なのでこれも重要 仲間から技術が盗める ◦ 何かしら自分よりできるところがあるはず、学べることは多い ◦ 例えばRstudio Server使うと自然に盗める
7.
アイディアが増えた ◦ 特徴量はすごく増えた ◦
XGBoostのseedを変える発想は私にはない seedを変えてうまくいくなんてとんでもない! ちなみに100個seed変えて平均したら71に勝って安心した 作業する手が増えた ◦ パラメータチューニングがさくっと終わった 私はチューニングがとても嫌い、だいたい一発目に勝てない 仲間から技術が盗めた ◦ Seedを変える根性 効率の良い探索、実験計画
8.
特徴量を全部投入する”genkidama” ◦ 結構強い
投稿するときに「よろしくお願いしまああああああす」 ◦ 特に良い効果はなかった 2位に転落してからの28時間は一番団結した ◦ 地方の公立校が高校野球の決勝で負けたような感じ
9.
投稿数が減る ◦ 自分が投稿したいときにできない ◦
遠慮しあった結果無駄にすることもありがち 経験値が減る ◦ 1人でやる方が勉強にはなる モチベーションが下がるときは下がる ◦ 何かと自由にできなくなる ◦ 協力してもうまくいかなかったときの絶望感 ◦ やらなくては、というプレッシャー モチベーションが低い人がチームを組んでも急に上がりはしない ◦ 逆にうまくやるとモチベーションが上がる?
10.
ムードメーカーは大事です ◦ コンペ中はうまくいくことよりも、いかないことの方が多い
順位はズルズル下がるもの 作戦も大事です ◦ 主にスケジュール ぶれないことはもっと大事 チームマネジメント ◦ 皆で同じことをやっても意味がない 自分の強みをチームに活かす、活かす方法を見つける ◦ 「できる人がやれることをやる」 学生時代にネトゲで学んだこと
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