This repository contains code and data for the AAAI'2022 paper "GALAXY: A Generative Pre-trained Model for Task-Oriented Dialog with Semi-Supervised Learning and Explicit Policy Injection".
Full version with Appendix: [PDF]
Pre-trained models have proved to be powerful in enhancing task-oriented dialog systems. However, current pre-training methods mainly focus on enhancing dialog understanding and generation tasks while neglecting the exploitation of dialog policy. In this paper, we propose GALAXY, a novel pre-trained dialog model that explicitly learns dialog policy from limited labeled dialogs and large-scale unlabeled dialog corpora via semi-supervised learning. Specifically, we introduce a dialog act prediction task for policy optimization during pre-training and employ a consistency regularization term to refine the learned representation with the help of unlabeled dialogs. We also implement a gating mechanism to weigh suitable unlabeled dialog samples. Empirical results show that GALAXY substantially improves the performance of task-oriented dialog systems, and achieves new state-of-the-art results on benchmark datasets: In-Car, MultiWOZ2.0 and MultiWOZ2.1, improving their end-to-end combined scores by 2.5, 5.3 and 5.5 points, respectively. We also show that GALAXY has a stronger few-shot ability than existing models under various low-resource settings.
GALAXY perform end-to-end dialog modeling and achieve new state-of-the-art results on four TOD benchmark datasets: MultiWOZ2.0, MultiWOZ2.1, In-Car Assistant and CamRest.
| End-to-End Modeling | Inform | Success | BLEU | Combined Score |
|---|---|---|---|---|
| MultiWOZ2.0 | 94.40 | 85.30 | 20.50 | 110.35 |
| MultiWOZ2.1 | 95.30 | 86.20 | 20.01 | 110.76 |
| End-to-End Modeling | Match | SuccF1 | BLEU | Combined Score |
|---|---|---|---|---|
| In-Car Assistant | 85.26 | 83.60 | 23.03 | 107.46 |
| CamRest | 98.50 | 87.73 | 24.15 | 117.26 |
| MultiWOZ | Inform | Success | BLEU | Combined Score |
|---|---|---|---|---|
| End-to-End Modeling | 85.40 | 75.70 | 19.64 | 100.2 |
| Policy Optimization | 92.80 | 83.50 | 19.92 | 108.1 |
- torch == 1.8.0+cu111
- scikit-learn == 0.23.1
- numpy == 1.18.5
- nltk == 3.5
- spacy == 2.3.5
- scipy == 1.5.0
- regex == 2020.6.8
- tqdm == 4.60.0
We use the tokenization tool in SpaCy and you can directly install python packages by commands: pip install -r requirements.txt and python -m spacy download en_core_web_sm.
Define your own paths <YOUR_PROJECT_PATH> and <YOUR_SAVE_PATH> in scripts as follows:
PROJECT_NAME="GALAXY" # project name (fixed)
PROJECT_ROOT=<YOUR_PROJECT_PATH>/${PROJECT_NAME} # root path of this project
SAVE_ROOT=<YOUR_SAVE_PATH>/${PROJECT_NAME} # root path of model's outputDownload data from this link.
The downloaded zip file data.zip contains pre-training corpora and four TOD benchmark datasets: MultiWOZ2.0, MultiWOZ2.1, In-Car Assistant and CamRest, which have already been processed. You need to put the unzipped directory data into the project directory GALAXY for the subsequent training.
- UniDA: a new labeled dialog dataset consisting of 975,780 utterances, which are annotated with 20 frequently-used DAs, according to our proposed comprehensive unified DA taxonomy for task-oriented dialog.
- UnDial: a large-scale unlabeled dialog dataset consisting of 35M utterances with careful processing, ranging from online forum chatting logs to customer service conversations.
- GALAXY: an uncased model with DA classification head (12-layers, 768-hidden, 12-heads, 109M parameters)
You need to unzip the downloaded model file model.zip, then put the unzipped directory model into the project directory GALAXY for the futhuer fine-tuning.
We pre-train the GALAXY on limited labeled dialogs (UniDA) and large-scale unlabeled dialog corpora (UnDial) via semi-supervised learning. You can pre-train GALAXY from scratch by running the following scripts:
# Step 1: Preprocess pre-training corpora
sh scripts/pre_train/preprocess.sh
# Step 2.1: Multi-GPU training on one machine
sh scripts/pre_train/train_single.sh
# Step 2.2: Multi-GPU training across multiple machines (distributed training)
sh scripts/pre_train/train_multi.shNOTE: For multi-GPU training, you only need to choose Step 2.1 or Step 2.2. It is worth noting that if you choose Step 2.2, you should have a well-equipped GPU cluster to support such training.
Download checkpoints from this link.
The downloaded zip file outputs.zip contains our best fine-tuned checkpoints on different datasets:
- the 7-th epoch on MultiWOZ2.0 (60 training epochs in total)
- the 5-th epoch on MultiWOZ2.1 (60 training epochs in total)
- the 89-th epoch on In-Car Assistant (100 training epochs in total)
- the 18-th epoch on CamRest (60 training epochs in total)
If you want to reproduce our reported results, you should put the unzipped directory outputs into the directory ${SAVE_ROOT} (set in scripts).
Then you can directly run the inference scripts of different datasets for the reproduction, which will be introduced later.
We fine-tune the GALAXY on the four TOD datasets and focus on the end-to-end dialog modeling (E2E) task. You can fine-tune GALAXY from scratch by running the following training scripts:
# Training on MultiWOZ2.0 (8 GPUs)
sh scripts/multiwoz2.0/train.sh
# Training on MultiWOZ2.1 (8 GPUs)
sh scripts/multiwoz2.1/train.sh
# Training on In-Car Assistant (1 GPU)
sh scripts/kvret/train.sh
# Training on CamRest (1 GPU)
sh scripts/camrest/train.shNOTE: For MultiWOZ2.0 and MultiWOZ2.1, we also maintain the DA prediction task to alleviate the model discrepancy between pre-training and fine-tuning. On the other hand, we discard this task on the In-Car Assistant and CamRest due to the lack of useful DAs in these two datasets. Besides, we support both multi-GPU and single-GPU training, you can jointly tune the hyper-parameter
${BATCH_SIZE}$and${GRADIENT_ACCUMULATION_STEPS}$to maintain originally offered batch size when single-GPU training.
After collecting some fine-tuned checkpoints (by directly using ours or fine-tuning GALAXY from scratch by yourself), you can do the inference on the test sets of these datasets by running the following inference scripts:
# Inference on MultiWOZ2.0 (1 GPU)
sh scripts/multiwoz2.0/infer.sh
# Inference on MultiWOZ2.1 (1 GPU)
sh scripts/multiwoz2.1/infer.sh
# Inference on In-Car Assistant (1 GPU)
sh scripts/kvret/infer.sh
# Inference on CamRest (1 GPU)
sh scripts/camrest/infer.shNOTE: For reproduction, all the best hyper-parameters have already been set in corresponding scripts and you can follow them to run. If you fine-tune GALAXY from scratch by yourself, the 4-th/60 to 7-th/60 training epochs could offer you the best inference performance on MultiWOZ2.0/2.1.
- For the implementation of UniLM architecture, we refer to the code of Pytorch-PLATO, which implements PLATO model in pytorch version.
- For the data preparation and evaluation on MultiWOZ2.0/2.1, we refer to the code of UBAR.
- For the data preparation and evaluation on In-Car Assistant/CamRest, we refer to the code of LABES.
If you use our code or find GALAXY useful in your work, please cite our paper as:
@article{he2022galaxy,
title={GALAXY: A Generative Pre-trained Model for Task-Oriented Dialog with Semi-Supervised Learning and Explicit Policy Injection},
author={He, Wanwei and Dai, Yinpei and Zheng, Yinhe and Wu, Yuchuan and Cao, Zheng and Liu, Dermot and Jiang, Peng and Yang, Min and Huang, Fei and Si, Luo and others},
journal={Proceedings of the AAAI Conference on Artificial Intelligence},
year={2022}
}For personal communication related to GALAXY, please contact Wanwei He ([email protected]).
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