This model is a Candidate Set Generator in "CDGP: Automatic Cloze Distractor Generation based on Pre-trained Language Model", Findings of EMNLP 2022.

Its input are stem and answer, and output is candidate set of distractors. It is fine-tuned by DGen dataset based on allenai/scibert_scivocab_uncased model.

For more details, you can see our paper or GitHub.

How to use?

Download model by hugging face transformers.

python

from transformers import BertTokenizer, BertForMaskedLM, pipeline

tokenizer = BertTokenizer.from_pretrained("AndyChiang/cdgp-csg-scibert-dgen")
csg_model = BertForMaskedLM.from_pretrained("AndyChiang/cdgp-csg-scibert-dgen")

Create a unmasker.

unmasker = pipeline("fill-mask", tokenizer=tokenizer, model=csg_model, top_k=10)

Use the unmasker to generate the candidate set of distractors.

python

sent = "The only known planet with large amounts of water is [MASK]. [SEP] earth"
cs = unmasker(sent)
print(cs)

Dataset

This model is fine-tuned by DGen dataset, which covers multiple domains including science, vocabulary, common sense and trivia. It is compiled from a wide variety of datasets including SciQ, MCQL, AI2 Science Questions, etc. The detail of DGen dataset is shown below.

DGen dataset	Train	Valid	Test	Total
Number of questions	2321	300	259	2880

You can also use the dataset we have already cleaned.

Training

We use a special way to fine-tune model, which is called "Answer-Relating Fine-Tune". More details are in our paper.

Training hyperparameters

The following hyperparameters were used during training:

Pre-train language model: allenai/scibert_scivocab_uncased
Optimizer: adam
Learning rate: 0.0001
Max length of input: 64
Batch size: 64
Epoch: 1
Device: NVIDIA® Tesla T4 in Google Colab

Testing

The evaluations of this model as a Candidate Set Generator in CDGP is as follows:

P@1	F1@3	MRR	NDCG@10
13.13	12.23	25.12	34.17

Other models

Candidate Set Generator

Models	CLOTH	DGen
BERT	cdgp-csg-bert-cloth	cdgp-csg-bert-dgen
SciBERT	cdgp-csg-scibert-cloth	cdgp-csg-scibert-dgen
RoBERTa	cdgp-csg-roberta-cloth	cdgp-csg-roberta-dgen
BART	cdgp-csg-bart-cloth	cdgp-csg-bart-dgen

Distractor Selector

fastText: cdgp-ds-fasttext

Citation

None