# Prompt-based methods for Dialog State Tracking  
  
Repository for my master thesis at the University of Stuttgart (IMS).  
  
Refer to this thesis [proposal](proposal/proposal_submission_1st.pdf) document for detailed explanation about thesis experiments.  
    
## Dataset
MultiWOZ 2.1 [dataset](https://github.com/budzianowski/multiwoz/blob/master/data/MultiWOZ_2.1.zip) is used for training and evaluation of the baseline/prompt-based methods. MultiWOZ is a fully-labeled dataset with a collection of human-human written conversations spanning over multiple domains and topics. Only single-domain dialogues are used in this setup for training and testing. Each dialogue contains multiple turns and may also contain a sub-domain *booking*. Five domains - *Hotel, Train, Restaurant, Attraction, Taxi* are used in the experiments and excluded the other two domains as they only appear in the training set. Under few-shot settings, only a portion of the training data is utilized to measure the performance of the DST task in a low-resource scenario. Dialogues are randomly picked for each domain. The below table contains some statistics of the dataset and data splits for the few-shot experiments.

| Data Split | # Dialogues | # Total Turns |
|--|:--:|:--:|
| 50-dpd | 250 | 1114 |
| 100-dpd | 500 | 2292 |
| 125-dpd | 625 | 2831 |
| 250-dpd | 1125 | 5187 |
| valid | 190 | 900 |
| test | 193 | 894 |

In the above table, term "*dpd*" refers to "*dialogues per domain*". For example, *50-dpd* means *50 dialogues per each domain*. 

All the training and testing data can be found under [/data/baseline/](data/baseline/) folder.

## Environment Setup
### Baseline (SOLOIST) Environment Setup
Python 3.6 is required for training the baseline model. `conda` is used for creating environments.

#### Create conda environment
Create an environment with specific python version (Python 3.6).
```shell
conda create -n <env-name> python=3.6
```

#### Activate the conda environment
Activate the conda environment for installing the requirements.
```shell
conda activate <env-name>
```

#### Deactivating the conda evironment
Deactivate the conda environment by running the following command:
(After running all the experiments)
```shell
conda deactivate
```
#### Download and extract SOLOIST pre-trained model
Download and unzip the pretrained model, this is used for finetuning the baseline and prompt-based methods. For more details about the pre-trained SOLOIST model, refer to the GitHub [repo](https://github.com/pengbaolin/soloist).

Download the zip file, replace the `/path/to/folder` from the below command to a folder of your choice.
```shell
wget https://bapengstorage.blob.core.windows.net/soloist/gtg_pretrained.tar.gz \
	-P /path/to/folder/
```

Extract the downloaded pretrained model zip file.
```shell
tar -xvf /path/to/folder/gtg_pretrained.tar.gz
```

#### Clone the repository
Clone the repository for source code
```shell
git clone https://git.pavanmandava.com/pavan/master-thesis.git
```
Pull the changes from remote (if local is behind the remote)
```shell
git pull
```
Change directory
```shell
cd master-thesis
```

#### Set Environment variables
Next step is to set environment variables that contains path to pre-trained model, saved models and output dirs.

Edit the [set_env.sh](set_env.sh) file and set the paths for: (`nano` or `vim` can be used)
`PRE_TRAINED_SOLOIST` - Path to the extracted pre-trained SOLOIST model
`SAVED_MODELS_BASELINE` - Path for saving the trained models at checkpoints
`OUTPUTS_DIR_BASELINE` - Path for storing the outputs of belief state predictions.

```shell
nano set_env.sh
```
Save the edited file and `source` it
```shell
source set_env.sh
```
Run the below line to unset the environment variables
```shell
sh unset_env.sh
```