randomwish/amazon23-item-categories

Amazon Reviews 2023 item subcategories

Derived from the item metadata of Amazon Reviews 2023 (Hou et al., 2024). Only parent_asin keys and category labels are included; titles, descriptions and reviews remain at the original source and its terms.

• subcategory is the first 2 levels of each item's categories path, joined with " > ".
• label_source = observed comes from the metadata. predicted comes from a text classifier (hashed TF-IDF word 1-2 grams, SGD logistic regression) trained on observed items of the same category file (files without paths use a donor file, see train_on in metrics/), kept only above a confidence threshold chosen on held-out items for 80% precision. unknown items fell below it or had no text.
• subcategory_summary joins groups to the official 5-core rating files where available (density = ratings / (users * rated_items)).

Label sources: observed: 31,493,162, predicted: 2,935,207, unknown: 964,820

Classifier hold-out metrics

category	classes	accuracy	macro-F1	threshold	coverage
All_Beauty	13	0.935	0.736	0.222	1.000
Amazon_Fashion	78	0.834	0.146	0.192	1.000
Appliances	7	0.977	0.942	0.400	1.000
Arts_Crafts_and_Sewing	23	0.912	0.738	0.163	1.000
Automotive	18	0.902	0.641	0.196	1.000
Baby_Products	16	0.947	0.779	0.197	1.000
Beauty_and_Personal_Care	13	0.935	0.736	0.222	1.000
Books	61	0.588	0.309	0.592	0.420
CDs_and_Vinyl	36	0.422	0.345	0.650	0.155
Cell_Phones_and_Accessories	12	0.918	0.463	0.272	1.000
Clothing_Shoes_and_Jewelry	78	0.834	0.146	0.192	1.000
Digital_Music	36	0.422	0.345	0.650	0.155
Electronics	20	0.910	0.789	0.178	1.000
Gift_Cards	2	0.985	0.977	0.896	1.000
Grocery_and_Gourmet_Food	27	0.870	0.495	0.192	1.000
Handmade_Products	14	0.945	0.802	0.224	1.000
Health_and_Household	21	0.914	0.643	0.191	1.000
Health_and_Personal_Care	21	0.914	0.643	0.191	1.000
Home_and_Kitchen	26	0.941	0.494	0.237	1.000
Industrial_and_Scientific	32	0.911	0.832	0.086	1.000
Kindle_Store	5	0.982	0.270	0.477	1.000
Magazine_Subscriptions	4	0.744	0.683	0.854	0.773
Movies_and_TV	74	0.372	0.210	inf	0.000
Musical_Instruments	15	0.911	0.858	0.197	1.000
Office_Products	6	0.976	0.670	0.374	1.000
Patio_Lawn_and_Garden	14	0.946	0.854	0.176	1.000
Pet_Supplies	14	0.914	0.509	0.206	1.000
Software	18	0.766	0.756	0.415	0.933
Sports_and_Outdoors	22	0.914	0.464	0.184	1.000
Subscription_Boxes	639	0.673	0.259	0.353	0.714
Tools_and_Home_Improvement	21	0.925	0.781	0.166	1.000
Toys_and_Games	28	0.786	0.614	0.306	0.974
Unknown	639	0.673	0.259	0.353	0.714
Video_Games	12	0.859	0.620	0.236	1.000