modify the kmeans to mini-batch k-means "ml/kmeans" add PI値 "retail/purchase-index", 平均客単価 "retail/average-spend"
add 1. "ml/kmeans" (kmeans.ts) 2. "series/moving-average" (time-helper.ts) 3. "time/week-number", "time/same-day-last-year" (time-helper.ts) 4. 購買率"retail/purchase-rate", リフト値"retail/lift-value", 原価率"retail/cost-ratio" 値入り率"retail/gross-margin" (server.ts)