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PWC

Adapt or Get Left Behind: Domain Adaptation through BERT Language Model Finetuning for Aspect-Target Sentiment Classification

code for our 2019 paper: "Adapt or Get Left Behind: Domain Adaptation through BERT Language Model Finetuning for Aspect-Target Sentiment Classification"

Installation

First clone repository, open a terminal and cd to the repository

python -m venv venv
source venv/bin/activate
pip install -r requirements.txt
python -m spacy download en_core_web_sm
mkdir -p data/raw/semeval2014  # creates directories for data
mkdir -p data/transformed
mkdir -p data/models

For downstream finetuning, you also need to install torch, pytorch-transformers package and APEX (here for CUDA 10.0, which is compatible with torch 1.1.0 ). You can also perform downstream finetuning without APEX, but it has been used for the paper.

pip install scipy sckit-learn  # pip install --default-timeout=100 scipy; if you get a timeout
pip install https://download.pytorch.org/whl/cu100/torch-1.1.0-cp36-cp36m-linux_x86_64.whl
pip install pytorch-transformers tensorboardX

cd ..
git clone https://github.com/NVIDIA/apex
cd apex
pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" ./

Preparing data for BERT Language Model Finetuning

We make use of two publicly available research datasets for the domains laptops and restaurants:

Download these datasets and put them into the data/raw folder.

To prepare the data for language model finetuning run the following python scripts:

python prepare_laptop_reviews.py
python prepare_restaurant_reviews.py
python prepare_restaurant_reviews.py --large  # takes some time to finish

Measure the number of non-zero lines to get the exact amount of sentences

cat data/transformed/restaurant_corpus_1000000.txt | sed '/^\s*$/d' | wc -l
# Rename the corpora files postfix to the actual number of sentences
# e.g  restaurant_corpus_1000000.txt -> restaurant_corpus_1000004.txt

Concatenate laptop corpus and the small restaurant corpus to create the mixed corpus (restaurants + laptops)

cd data/transformed
cat laptop_corpus_1011255.txt restaurant_corpus_1000004.txt > mixed_corpus.txt

Preparing SemEval 2014 Task 4 Dataset for Experiments

Download all the SemEval 2014 Task 4 datasets from: http://metashare.ilsp.gr:8080/repository/search/?q=semeval+2014 into

data/raw/semeval2014/

and unpack the archives. Create the preprocessed datasets using the following commands

Laptops

# laptops

# laptops without conflict label
python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Train Data v2.0 & Annotation Guidelines/Laptop_Train_v2.xml" \
--output_dir data/transformed/laptops_noconfl \
--istrain \
--noconfl

python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Test Data - Gold Annotations/ABSA_Gold_TestData/Laptops_Test_Gold.xml" \
--output_dir data/transformed/laptops_noconfl \
--noconfl

Restaurants

# restaurants without conflict label
python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Train Data v2.0 & Annotation Guidelines/Restaurants_Train_v2.xml" \
--output_dir data/transformed/restaurants_noconfl \
--istrain \
--noconfl

python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Test Data - Gold Annotations/ABSA_Gold_TestData/Restaurants_Test_Gold.xml" \
--output_dir data/transformed/restaurants_noconfl \
--noconfl

Mixed

# mixed without conflict label
python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Train Data v2.0 & Annotation Guidelines/Restaurants_Train_v2.xml" \
"data/raw/semeval2014/SemEval-2014 ABSA Train Data v2.0 & Annotation Guidelines/Laptop_Train_v2.xml" \
--output_dir data/transformed/mixed_noconfl \
--istrain --noconfl

python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Test Data - Gold Annotations/ABSA_Gold_TestData/Restaurants_Test_Gold.xml" \
"data/raw/semeval2014/SemEval-2014 ABSA Test Data - Gold Annotations/ABSA_Gold_TestData/Laptops_Test_Gold.xml" \
--output_dir data/transformed/mixed_noconfl --noconfl

New: Upsampling training data for ablation study checking the influence of the labeldistribution on end-performance:

Laptops

# Laptop-upsampled->test:

python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Train Data v2.0 & Annotation Guidelines/Laptop_Train_v2.xml" \
--output_dir data/transformed/laptops_noconfl_uptest \
--istrain \
--noconfl --upsample "0.534 0.201 0.265" --seed 41

python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Test Data - Gold Annotations/ABSA_Gold_TestData/Laptops_Test_Gold.xml" \
--output_dir data/transformed/laptops_noconfl_uptest \
--noconfl

Restaurants

# Restaurants-upsampled->test:

python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Train Data v2.0 & Annotation Guidelines/Restaurants_Train_v2.xml" \
--output_dir data/transformed/restaurants_noconfl_uptest \
--istrain \
--noconfl --upsample "0.650 0.175 0.175" --seed 41

python prepare_semeval_datasets.py \
--files "data/raw/semeval2014/SemEval-2014 ABSA Test Data - Gold Annotations/ABSA_Gold_TestData/Restaurants_Test_Gold.xml" \
--output_dir data/transformed/restaurants_noconfl_uptest \
--noconfl

Release of BERT language models finetuned on a specific domain

The models should be compatible with the huggingface/pytorch-transformers module version > 1.0. The models are compressed with tar.xz and need to be decompressed before usage.

BERT Language Model Finetuning

Check the README in the "finetuning_and_classification" folder for how to finetune the BERT models on a domain specific corpus.

Down-Stream Classification

Check the README in the "finetuning_and_classification" folder for how to train the BERT-ADA models on the downstream task.

Citation

If you use this work, please cite our paper using the following Bibtex tag:

@article{rietzler2019adapt,
   title={Adapt or Get Left Behind: Domain Adaptation through BERT Language Model Finetuning for Aspect-Target Sentiment Classification},
   author={Rietzler, Alexander and Stabinger, Sebastian and Opitz, Paul and Engl, Stefan},
   journal={arXiv preprint arXiv:1908.11860},
   year={2019}
}

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code for our 2019 paper: "Adapt or Get Left Behind: Domain Adaptation through BERT Language Model Finetuning for Aspect-Target Sentiment Classification"

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