Mei gao practicedemo_6
date post
19-Jul-2015Category
Data & Analytics
view
192download
0
Embed Size (px)
Transcript of Mei gao practicedemo_6
PowerPoint Presentation
Problem:What & Where to eat?
Mei Gao
imfeelinghungryy.comTopic0japaneseTopic1mexicanTopic2brunchTopic3bar/atmosphereTopic4pizzaTopic 5complimentsushitacosbreakfastgreatpizzagreat rollmexicancoffeebeercrustbestpitasalsaeggshappy hourwingslovetunaburritobaconbarthingoodsalmonchipspancakesdrinkspepperonilikeTopic6indianTopic7asianTopic8fast foodTopic9sweetsTopic10bbqTopic 11bad serviceindianthaiburgerbagelscheeseservicebuffetphofriescheesebbqdidntmasalachinesepotatobestsaucenevernaansouponion ringssmoothieschickenevenbiancocurrydogIoveribsbackLDA (Latent Dirichlet Allocation) 12 topicsGood restaurant: average star>3.5Bad restaurant: average star99% dimension reductionComputation Efficiency2.5 hrs15 min>90% computation time (2000 samples)(10 fold cross validation)
Topic0Topic1Topic2Topic3Topic4JapaneseMexicanbrunchBar/pizzaAtmospheresushitacosbreakfastgreatpizzarollmexicancoffeebeercrustpitasalsaeggshappyhourwingstunaburritobaconbarthinsalmonchipspancakesdrinkspepperoniTopic5Topic6Topic7Topic8Topic9IndianAsianfastfoodsweetsbbqIndianThaiburgerbagelscheesebuffetPhofriescheesebbqmasalaChinesepotatobestsaucenaansoupOnion ringsmoothieschickenbiancocurrydogIoveribsLDA (Latent DiriChlet Allocation) 15 topicsTopic 10: ComplimentGreat, best, live, good, like
Topic 11: Service ( Bad)Service, didnt, never, even, back
Evaluation of Recommendation Error Using Normalized Distance-based Performance Measure (NDPM)
R_2R_5R_1R_3R_4R_1R_2R_3R_4R_5RecomActual Ranking(ground truth)
Evaluation of Recommendation Error Using Normalized Distance-based Performance Measure (NDPM) R_2R_5R_1R_3R_4R_1R_2R_3R_4R_5RecomActual Ranking(ground truth) Minimize NDPM scoreGoal:
