ConvLab-2

ConvLab-2 is an open-source toolkit that enables researchers to build task-oriented dialogue systems with state-of-the-art models, perform an end-to-end evaluation, and diagnose the weakness of systems. As the successor of ConvLab, ConvLab-2 inherits ConvLab's framework but integrates more powerful dialogue models and supports more datasets. Besides, we have developed an analysis tool and an interactive tool to assist researchers in diagnosing dialogue systems. [paper]

• Installation
• Tutorials
• Documents
• Models
• Supported Datasets
• End-to-end Performance on MultiWOZ
• Module Performance on MultiWOZ
• Issues
• Contributions
• Citing
• License

Installation

Require python 3.6.

Clone this repository:

git clone https://github.com/thu-coai/ConvLab-2.git

Install ConvLab-2 via pip:

cd ConvLab-2
pip install -e .

Tutorials

• Getting Started (Have a try on Colab!)
• Add New Model
• Train RL Policies
• Interactive Tool [demo video]

Documents

Our documents are on https://thu-coai.github.io/ConvLab-2_docs/convlab2.html.

Models

We provide following models:

• NLU: SVMNLU, MILU, BERTNLU
• DST: rule, MDBT, TRADE, SUMBT
• Policy: rule, Imitation, REINFORCE, PPO, GDPL, MDRG, HDSA, LaRL
• Simulator policy: Agenda, VHUS
• NLG: Template, SCLSTM
• End2End: Sequicity, DAMD, RNN_rollout

For more details about these models, You can refer to README.md under convlab2/$module/$model/$dataset dir such as convlab2/nlu/jointBERT/multiwoz/README.md.

Supported Datasets

• Multiwoz 2.1
  • We add user dialogue act (inform, request, bye, greet, thank), remove 5 sessions that have incomplete dialogue act annotation and place it under data/multiwoz dir.
  • Train/val/test size: 8434/999/1000. Split as original data.
  • LICENSE: Attribution 4.0 International, url: http://creativecommons.org/licenses/by/4.0/
• CrossWOZ
  • We offers a rule-based user simulator and a complete set of models for building a pipeline system on the CrossWOZ dataset. We correct few state annotation and place it under data/crosswoz dir.
  • Train/val/test size: 5012/500/500. Split as original data.
  • LICENSE: Attribution 4.0 International, url: http://creativecommons.org/licenses/by/4.0/
• Camrest
  • We add system dialogue act (inform, request, nooffer) and place it under data/camrest dir.
  • Train/val/test size: 406/135/135. Split as original data.
  • LICENSE: Attribution 4.0 International, url: http://creativecommons.org/licenses/by/4.0/
• Dealornot
  • Placed under data/dealornot dir.
  • Train/val/test size: 5048/234/526. Split as original data.
  • LICENSE: Attribution-NonCommercial 4.0 International, url: https://creativecommons.org/licenses/by-nc/4.0/

End-to-end Performance on MultiWOZ

Notice: The results are for commits before bdc9dba (inclusive). We will update the results after improving user policy.

We perform end-to-end evaluation (1000 dialogues) on MultiWOZ using the user simulator below (a full example on tests/test_end2end.py) :

# BERT nlu trained on sys utterance
user_nlu = BERTNLU(mode='sys', config_file='multiwoz_sys_context.json', model_file='https://convlab.blob.core.windows.net/convlab-2/bert_multiwoz_sys_context.zip')
user_dst = None
user_policy = RulePolicy(character='usr')
user_nlg = TemplateNLG(is_user=True)
user_agent = PipelineAgent(user_nlu, user_dst, user_policy, user_nlg, name='user')

analyzer = Analyzer(user_agent=user_agent, dataset='multiwoz')

set_seed(20200202)
analyzer.comprehensive_analyze(sys_agent=sys_agent, model_name='sys_agent', total_dialog=1000)

Main metrics (refer to convlab2/evaluator/multiwoz_eval.py for more details):

• Complete: whether complete the goal. Judged by the Agenda policy instead of external evaluator.
• Success: whether all user requests have been informed and the booked entities satisfy the constraints.
• Book: how many the booked entities satisfy the user constraints.
• Inform Precision/Recall/F1: how many user requests have been informed.
• Turn(succ/all): average turn number for successful/all dialogues.

Performance (the first row is the default config for each module. Empty entries are set to default config.):

NLU	DST	Policy	NLG	Complete rate	Success rate	Book rate	Inform P/R/F1	Turn(succ/all)
BERTNLU	RuleDST	RulePolicy	TemplateNLG	90.5	81.3	91.1	79.7/92.6/83.5	11.6/12.3
MILU	RuleDST	RulePolicy	TemplateNLG	93.3	81.8	93.0	80.4/94.7/84.8	11.3/12.1
BERTNLU	RuleDST	RulePolicy	SCLSTM	48.5	40.2	56.9	62.3/62.5/58.7	11.9/27.1
BERTNLU	RuleDST	MLEPolicy	TemplateNLG	42.7	35.9	17.6	62.8/69.8/62.9	12.1/24.1
BERTNLU	RuleDST	PGPolicy	TemplateNLG	37.4	31.7	17.4	57.4/63.7/56.9	11.0/25.3
BERTNLU	RuleDST	PPOPolicy	TemplateNLG	61.1	44.0	44.6	63.9/76.8/67.2	12.5/20.8
BERTNLU	RuleDST	GDPLPolicy	TemplateNLG	49.4	38.4	20.1	64.5/73.8/65.6	11.5/21.3
None	TRADE	RulePolicy	TemplateNLG	32.4	20.1	34.7	46.9/48.5/44.0	11.4/23.9
None	SUMBT	RulePolicy	TemplateNLG	34.5	29.4	62.4	54.1/50.3/48.3	11.0/28.1
BERTNLU	RuleDST	MDRG	None	21.6	17.8	31.2	39.9/36.3/34.8	15.6/30.5
BERTNLU	RuleDST	LaRL	None	34.8	27.0	29.6	49.1/53.6/47.8	13.2/24.4
None	SUMBT	LaRL	None	32.9	23.7	25.9	48.6/52.0/46.7	12.5/24.3
None	None	DAMD*	None	39.5	34.3	51.4	60.4/59.8/56.3	15.8/29.8

*: end-to-end models used as sys_agent directly.

Module Performance on MultiWOZ

NLU

By running convlab2/nlu/evaluate.py MultiWOZ $model all:

	Precision	Recall	F1
BERTNLU	82.48	85.59	84.01
MILU	80.29	83.63	81.92
SVMNLU	74.96	50.74	60.52

DST

By running convlab2/dst/evaluate.py MultiWOZ $model:

	Joint accuracy	Slot accuracy	Joint F1
MDBT	0.06	0.89	0.43
SUMBT	0.30	0.96	0.83
TRADE	0.40	0.96	0.84

Policy

Notice: The results are for commits before bdc9dba (inclusive). We will update the results after improving user policy.

By running convlab2/policy/evalutate.py --model_name $model

	Task Success Rate
MLE	0.56
PG	0.54
PPO	0.74
GDPL	0.58

NLG

By running convlab2/nlg/evaluate.py MultiWOZ $model sys

	corpus BLEU-4
Template	0.3309
SCLSTM	0.4884

Translation-train SUMBT for cross-lingual DST

Train

With Convlab-2, you can train SUMBT on a machine-translated dataset like this:

# train.py
import os
from sys import argv

if __name__ == "__main__":
    if len(argv) != 2:
        print('usage: python3 train.py [dataset]')
        exit(1)
    assert argv[1] in ['multiwoz', 'crosswoz']

    from convlab2.dst.sumbt.multiwoz_zh.sumbt import SUMBT_PATH
    if argv[1] == 'multiwoz':
        from convlab2.dst.sumbt.multiwoz_zh.sumbt import SUMBTTracker as SUMBT
    elif argv[1] == 'crosswoz':
        from convlab2.dst.sumbt.crosswoz_en.sumbt import SUMBTTracker as SUMBT

    sumbt = SUMBT()
    sumbt.train(True)

Evaluate

Execute evaluate.py (under convlab2/dst/) with following command:

python3 evaluate.py [CrossWOZ-en|MultiWOZ-zh] [val|test|human_val]

evaluation of our pre-trained models are: (joint acc.)

type	CrossWOZ-en	MultiWOZ-zh
val	12.4%	45.1%
test	12.4%	43.5%
human_val	10.6%	49.4%

human_val option will make the model evaluate on the validation set translated by human.

Note: You may want to download pre-traiend BERT models and translation-train SUMBT models provided by us.

Without modifying any code, you could:

• download pre-trained BERT models from:

  • bert-base-uncased for CrossWOZ-en
  • chinese-bert-wwm-ext for MultiWOZ-zh

  extract it to ./pre-trained-models.

• for translation-train SUMBT model:

  • trained on CrossWOZ-en
  • trained on MultiWOZ-zh
  • Say the data set is CrossWOZ (English), (after extraction) just save the pre-trained model under ./convlab2/dst/sumbt/crosswoz_en/pre-trained and name it with pytorch_model.bin.

Issues

You are welcome to create an issue if you want to request a feature, report a bug or ask a general question.

Contributions

We welcome contributions from community.

• If you want to make a big change, we recommend first creating an issue with your design.
• Small contributions can be directly made by a pull request.
• If you like make contributions to our library, see issues to find what we need.

Team

ConvLab-2 is maintained and developed by Tsinghua University Conversational AI group (THU-coai) and Microsoft Research (MSR).

We would like to thank:

Yan Fang, Zhuoer Feng, Jianfeng Gao, Qihan Guo, Kaili Huang, Minlie Huang, Sungjin Lee, Bing Li, Jinchao Li, Xiang Li, Xiujun Li, Lingxiao Luo, Wenchang Ma, Mehrad Moradshahi, Baolin Peng, Runze Liang, Ryuichi Takanobu, Hongru Wang, Jiaxin Wen, Yaoqin Zhang, Zheng Zhang, Qi Zhu, Xiaoyan Zhu.

Citing

If you use ConvLab-2 in your research, please cite:

@inproceedings{zhu2020convlab2,
    title={ConvLab-2: An Open-Source Toolkit for Building, Evaluating, and Diagnosing Dialogue Systems},
    author={Qi Zhu and Zheng Zhang and Yan Fang and Xiang Li and Ryuichi Takanobu and Jinchao Li and Baolin Peng and Jianfeng Gao and Xiaoyan Zhu and Minlie Huang},
    year={2020},
    booktitle={Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics},
}

License

Apache License 2.0