toeicbert 0.0.2

TOEIC blank problem solving using pytorch-pretrained-BERT model.

TOEIC-BERT

76% Correct rate with ONLY Pre-Trained BERT model in TOEIC!!

This is project as topic: TOEIC(Test of English for International Communication) problem solving using pytorch-pretrained-BERT model. The reason why I used huggingface's pytorch-pretrained-BERT model is for pre-training or to do fine-tune more easily. I've solved the only blank problem, not the whole problem. There are two types of blank issues:

1. Selecting Correct Grammar Type.

Q) The teacher had me _________ scales several times a day.
  1. play (Answer)
  2. to play
  3. played
  4. playing

2. Selecting Correct Vocabulary Type.

Q) The wet weather _________ her from going shopping.
  1. interrupted
  2. obstructed
  3. impeded
  4. discouraged (Answer)

Why BERT?

In pretrained BERT, It contains contextual information. So It can find more contextual or grammatical sentences, not clear, a little bit. I was inspired by grammar checker from blog post.

Can We Use BERT as a Language Model to Assign a Score to a Sentence?

BERT uses a bidirectional encoder to encapsulate a sentence from left to right and from right to left. Thus, it learns two representations of each word-one from left to right and one from right to left-and then concatenates them for many downstream tasks.

Evaluation

I had evaluated with only pretrained BERT model(not fine-tuning) to check grammatical or lexical error. Above mathematical expression, X is a question sentence. and n is number of questions : {a, b, c, d}. C subset means answer candidate tokens : C of warranty is ['warrant', '##y']. V means total Vocabulary.

There's a problem with more than one token. I solved this problem by getting the average value of each tensor. ex) is being formed as ['is', 'being', 'formed']

Then, we find argmax in L_n(T_n).

predictions = model(question_tensors, segment_tensors)

# predictions : [batch_size, sequence_length, vocab_size]
predictions_candidates = predictions[0, masked_index, candidate_ids].mean()

Result of Evaluation.

Fantastic result with only pretrained BERT model

• bert-base-uncased: 12-layer, 768-hidden, 12-heads, 110M parameters
• bert-large-uncased: 24-layer, 1024-hidden, 16-heads, 340M parameters
• bert-base-cased: 12-layer, 768-hidden, 12-heads , 110M parameters
• bert-large-cased: 24-layer, 1024-hidden, 16-heads, 340M parameters

Total 7067 datasets: make non-deterministic with model.eval()

	bert-base-uncased	bert-base-cased	bert-large-uncased	bert-large-cased
Correct Num	5192	5398	5321	5148
Percent	73.46%	76.38%	75.29%	72.84

Quick Start with Python pip Package.

Start with pip

$ pip install toeicbert

Run & Option

$ python toeicbert -m bert-base-uncased -f test.json

• -m, --model : bert-model name in huggingface's pytorch-pretrained-BERT : bert-base-uncased, bert-large-uncased, bert-base-cased, bert-large-cased.

• -f, --file : json file to evalution, see json format, test.json.

  key(question, 1, 2, 3, 4) is required options, but answer not.

  _ in question will be replaced to [MASK]

{
    "1" : {
        "question" : "The teacher had me _ scales several times a day.",
        "answer" : "play",
        "1" : "play",
        "2" : "to play",
        "3" : "played",
        "4" : "playing"
    },
    "2" : {
        "question" : "The teacher had me _ scales several times a day.",
        "1" : "play",
        "2" : "to play",
        "3" : "played",
        "4" : "playing"
    }
}

Author

• Tae Hwan Jung(Jeff Jung) @graykode, Kyung Hee Univ CE(Undergraduate).
• Author Email : [e-mail]

Thanks for Hwan Suk Gang(Kyung Hee Univ.) for collecting Dataset(7114 datasets)