Knowledge Based Question Answering

Update

We update dev.small.pickle and test.data.cfo.pickle in baidu pan key: c9mi or google drive.

Description

This is the code of KBQA baseline following CFO: Conditional Focused Neural Question Answering with Large-scale Knowledge Bases. Similar with the CFO, we also use type vector(one-hot) to repesent the entity, But we change something for our purpose.

Different from CFO

1. We are training both subject and relation at the same time.
2. We use log-likelihood to replace relation loss in "CFO", we also calculate all relation in FB5M to get the probability.
3. We use Adam optimizer to replace AdaGrad with momentum in CFO.
4. In CFO, they use alpha to add subject score to relation score, which need to fine-turn this hyper-parameter, we directly add subject score and relation score 1:1, then multiply alpha matrix, which alpha matrix is the binary function of subject to relation in KB.
5. Also we share the word embedding between subject and relation, from our experiment this is no matter for model.

Requirement

python 3.5+

tensorflow 1.2+

nltk

Usage

Preprocess

please run data/preprocess.sh to download raw data and generate train data. Important! Because of freebase API was deprecated，we can't use this API to get candidate when focus prune, so we use valid candidate and test candidate from CFO(the path is data/kbqa_data/dev.small.pickle data/kbqa_data/test.data.cfo.pickle). Now thanks the support of Zihang Dai.

Focus Prune

See example in fp_train.sh See example in fp_test.sh After train and test, you can see sq.dev.label sq.test.label in fp_output directory, your model saved in fp_model directory.

Entity Match

Because of freebase API was deprecated, we only use strict match to get the candidate of each question.

Configuration

relation subject network setting in setting.py Focus prune setting in setting_fp.py

Training

See example in train.sh

Testing

See example in test.sh

After test, you can see sq.all.txt in output directory, your model saved in model directory

Performance

kbqa

View	subject	relation	all
acc	0.797759	0.829391	0.732743

Focus Prune

dataset	pred	recall	f1
dev	0.9053	0.8129	0.8566
test	0.8982	0.8230	0.8589