BakeAgain

Helen CraigInsight Data Science Fellow2015

To improve one’s recipes and encourage people to bake again.

Algorithm

natural language processing

Gaussian Naive Bayes: modifications from comments

TF-IDF + Multinomial Naive Bayes:Comment trending topics

BakeAgain

2k-9k comments per recipes

Algorithm

natural language processing

Gaussian Naive Bayes: modifications from comments

TF-IDF + Multinomial Naive Bayes:Comment trending topics

compare recipe reviews to movie reviews

movie review: ‘wonderful/terrible’food review: ‘chewy/mushy’ BakeAgain

2k-9k comments per recipes

The Data

“I did as suggested in other reviews and increased the flour by 1/2 cup and baking soda by 1/2 tablespoon, cut the salt to 1/2 tsp. This made the absolutely best cookies ever!! I made them this afternoon thinking they'd last the rest of the week. No way! Between my husband and two children, they'll be gone by tomorrow night. They're fantastic. I'll make these alot!”

The Data

“I did as suggested in other reviews and increased the flour by 1/2 cup and baking soda by 1/2 tablespoon, cut the salt to 1/2 tsp. This made the absolutely best cookies ever!! I made them this afternoon thinking they'd last the rest of the week. No way! Between my husband and two children, they'll be gone by tomorrow night. They're fantastic. I'll make these alot!”

The Complication

“I added 1 teaspoon salt.”

Original Amount:2 teaspoons

Action Words used with Salt in Chewy Chocolate Chip Oatmeal Cookies

“Add”

“Use”

“Instead of”“Decrease”

Decrease Salt

"I also added less salt than it called for, about 1/4 teaspoon."

"I also only used 1/4 t salt since I always use margarine."

"For those complaining it's too salty-try 1/2 tsp salt instead of 1 tsp salt."

"My only suggestion is, if you are using salted butter, be sure to omit the extra salt."

“Increase”

Gaussian Naive Bayes fit

Word Use Frequencies in CommentsDecrease Butter Increase Flour Add Walnuts

“Use”

“Instead of”

“Decrease”

“Add”“Add”

“Increase”

accuracy 70%-80%5 (by hand) tagged recipesleave one out cross validation

2k-9k comments per recipes

Helen Craig

screen shots

backup

reduce modification-related words

Algorithm

classify ingredients-related/modification-related words and adjectives

Find ngrams with classified words

Gaussian Naive Bayes to decide overall meaning in comments: add, inc, dec, mix

halfremoveomit

decrease

‘use walnuts’‘reduce salt’

Multinomial Naive Bayes:Food Description

Other classifiers

K Nearest NeighborsLinear SVMRBF SVMDecision Tree--reasonableRandom Forest--reasonableAdaBoost--reasonableLinear Discriminant Analysis--goodQuadratic Discriminant Analysis--good

Taking the sentiment out of sentiment analysis pos review: ‘wonderful’neg review: ‘terrible’

movie review: ‘wonderful/terrible’pos review: ‘chewy’neg review: ‘mushy’

movie

negative

positive

TF-IDF +Multinomial Naive Bayes

to-do

Reviews that mention other reviews

word2vec to find more action words

modifications vs. ratings