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Slide
1.
機械学習スキル向上のため Kaggleにチャレンジしてみた
2.
Kaggleとは ・企業等が課題解決に用いる機械学習等のモデルを公募しているホームペー ジ(モデルコンペサイト) ・Kaggleアカウントがあれば、誰でも無料で参加可能 ・参加者同士でモデルの精度を競い合い、順位が発表される ・優勝者には賞金が支払われるコンペもある ・サイト内には参加者同士で意見交換できる場も設けられている
3.
挑戦したコンペ ・初心者向けの入門コンペ。 ・1912年に起きた豪華客船タイタニック号沈没がテーマ。 ・乗客の属性、生死の結果等の訓練データが与えられる。 ・どのような人物が生き残る可能性が高いのかを分析し、 生死の結果を予測するモデルを作成する。 PassengerId Survived Pclass
Name Sex Age SibSp Parch Ticket Fare Cabin 1 0 3 Braund, Mr. Owen Harris male 22 1 0 A/5 21171 7.25 2 1 1 Cumings, Mrs. John Bradley (Florence Briggs Thayer)female 38 1 0 PC 17599 71.2833 C85 3 1 3 Heikkinen, Miss. Laina female 26 0 0 STON/O2. 31012827.925 4 1 1 Futrelle, Mrs. Jacques Heath (Lily May Peel)female 35 1 0 113803 53.1 C123 5 0 3 Allen, Mr. William Henry male 35 0 0 373450 8.05 訓練データ(抜粋)
4.
さぁ挑戦だ!① 訓練データの前処理(機械が読めるデータ、高精度モデルを作れるデータに変 換)が苦労した。。 訓練データ SVM (機械学習アルゴ リズム) 生死判定 モデル 生死判定 モデル テストデータ 生死判定結果 提出! Kaggleより提供 Kaggleより提供 Sklearn・Numpyを使用
5.
さぁ挑戦だ!② <データ前処理>Pandas・seaborn・matplotlibを使用 ・カラム毎に欠損値の有無を確認 (欠損値をカラムの中央値で埋める、欠損値が大多数のカラムは削除) ・機械が読めるデータ形式に変換(文字列→数値) ・データ間の相関性の確認 ⇒相関が強いデータが複数個ある場合、説明変数を1種類に絞りこむ 当該データを全て説明変数にすると、モデルの精度低下を引き起こすため 等々、 訓練データの前処理⇒モデル作成⇒モデル精度確認のサイクルを繰り返した。 PassengerId Survived Pclass
Name Sex Age SibSp Parch Ticket Fare Cabin 1 0 3 Braund, Mr. Owen Harris male 22 1 0 A/5 21171 7.25 2 1 1 Cumings, Mrs. John Bradley (Florence Briggs Thayer)female 38 1 0 PC 17599 71.2833 C85 3 1 3 Heikkinen, Miss. Laina female 26 0 0 STON/O2. 31012827.925 4 1 1 Futrelle, Mrs. Jacques Heath (Lily May Peel)female 35 1 0 113803 53.1 C123 5 0 3 Allen, Mr. William Henry male 35 0 0 373450 8.05 訓練データ(抜粋)
6.
成績は…13,000人中10,931位でした
7.
上位成績者のコメント 丁寧な前処理・試行錯誤(何度も傾向分析・モデル作成) を粘り強く行う ・無暗に列・行を捨てない(有効な特徴を消さない) ・空白を埋める際の方針決定(最頻値、条件分岐) ・カラムの統合(ParchとSibを足し算など) 等々
8.
再度挑戦!…593位に
9.
まとめ ・機械学習スキル向上には、色々な人の意見を取り入れ、実戦することが大 切だと思った。 ・今後も経験を積み、知識を深めていきたいと思うこの頃。(もっと自分の 時間が欲しい。。)
10.
ご清聴頂きありがとうございました!
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