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モダンなアルゴリズム開発
 ~ spark-notebookを使って
奥村康樹
自己紹介
● 奥村康樹
● Scala歴5年くらい
● Tameccoってところで働いています
今回話すこと、話さないこと
● アルゴリズム開発のフロー
○ 失敗したフロー
○ 成功したフロー
● 実際のアルゴリズム自体の話はしません
● Sparkの話はしません
作ったものの説明とチーム構成
● インドアナビゲーションシステム
○ GoogleMapのインドアヴァージョン
● チーム構成
○ サーバーエンジニア 一人
○ アンドロイドエンジニア 一人
○ iOSエンジニア 一人
● Trilateration(三遍
測量)
● Finger Print
● Dead reckoning
● etc..
● シグナル/電波
● 音波
● 光
● EMF
● アクセロメーター
● etc..
インドアナビゲーション
データ
● RSSI
● ToA
● TDoA
● etc..
距離測定方法 アルゴリズム
デモで使うアルゴリム
● Bluetoothシグナル
● RSSI
● Trilateration(三遍測量)
: Bluetooth発信機
: 人/アプリ(測定したい場所)
: Bluetooth発信機
: 人/アプリ(測定したい場所)
BluetoothID x y
A 0 0
B 3.5 7
C 9 10
モダン?
● エッジコンピューティング
● Notebook
Notebook
● Jupyter
● Spark notebook
* Video内でNotebookの簡単なデモしてますので要参照(videoのリンクは後
日)
失敗した開発方法
クライアント側アプリごとアルゴリズム開発
1. 毎回フィールドテスト
2. 評価が難しい
3. 原因究明困難
a. アルゴリズム自体がよくない
b. アルゴリズムの実装バグ
c. アプリバグ
d. ハードウェア要因
e. 外部要因
アイディア
テスト 実装
外部要因
ハードウェア要因
アプリバグ
アルゴリズム実装バグ
アルゴリズム自体
アイディ
ア
テスト
実
装
外部要因
ハードウェア要因
アプリバグ
アルゴリズム実装バグ
アルゴリズム自体
アルゴリズム開発
アイ
ディ
ア
テ
ス
ト
実
装
外部要
因
ハードウェア要因
アプリバグ
アルゴリズム実装バグ
アルゴリズム自体
アプリ開発
成功した開発方法
アルゴリズム開発
アイ
ディ
ア
テ
ス
ト
実
装
アプリ開発
アルゴリズム実装
ユニットテスト
フィールドテスト
データ収集
データ収集アプリ作成
データ収集
Notebook使用
データ収集
● なるべく多くの端末で
● なるべく多くのデータ
● 加工してない生のデータ
● 集めたデータはCSVに
アルゴリズム開発
● トライアンドエラー
● 結果をビジュアリゼーション
● アプリにあった評価関数を作る
● ビジュアライゼーションと数値評価は両方必要
* Video内でNotebook使ったデモしてますので要参照(videoのリンクは後日)
アルゴリズム開発 ---> アプリ開発
● アルゴリズムのシェア
● ユニットテスト
アルゴリズムのシェア
● パイプライン作成
● ドキュメント作成
● 口頭で説明
Input:
1. RSSI List
2. B Location List
3. 現在時刻
RSSI Filtering
0utput:
1. Array(
( (x, y), rssi )
)
Filter:
• 現在時刻 - 20秒 < 対象
データ < 現在時刻
• 0 > rssi > -100
Reduce:
• Average( rssi )
Input:
1. Array(
( (x, y), rssi )
)
RSSI Conversion
0utput:
1. Array(
( (x, y), distance )
)
Map:
RSSIを距離に変換
Input:
1. Array(
( (x, y), distance )
)
Location Calc
0utput:
1. (x, y)
• Sort by distance
• Take 3 shortest data
• Trilateration
ユニットテストのデータ作成
● Notebookで作成してシェア
○ ドキュメント
○ 実行可能なコード
○ ビジュアライズと数値評価でテスト
* Video内でNotebook使ったデモしてますので要参照(videoのリンクは後日)
アプリ開発
● テストデータを元にユニットテスト作成
● 必要であればメモリ、計算量の最適化を行う
● フィールドテストは必要
まとめ
● クライアント側でアルゴリズム開発はやらない
● アルゴリズム開発とアプリ開発は分けよう
● データ収集してアルゴリズム開発を行おう
● ヴィジュアルと数値評価両方必要
● ユニットテストデータを作成してあげよう
● アプリ開発ではアルゴリズムのユニットテストは必須
ありがとうございました。

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モダンなアルゴリズム開発 ~ SparkNotebookを使って