PyTorch code for Learning Cooperative Visual Dialog Agents using Deep Reinforcement Learning
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README.md

Visdial-RL-PyTorch

PyTorch implementation of the paper:

Learning Cooperative Visual Dialog Agents with Deep Reinforcement Learning
Abhishek Das*, Satwik Kottur*, José Moura, Stefan Lee, and Dhruv Batra
https://arxiv.org/abs/1703.06585
ICCV 2017 (Oral)

Visual Dialog requires an AI agent to hold a meaningful dialog with humans in natural, conversational language about visual content. Given an image, dialog history, and a follow-up question about the image, the AI agent has to answer the question.

This repository contains code for training the questioner and answerer bots described in the paper, in both supervised fashion and via deep reinforcement learning on the Visdial 0.5 dataset for the cooperative visual dialog task of GuessWhich.

models

Table of Contents

Setup and Dependencies

Our code is implemented in PyTorch (v0.3.1). To setup, do the following:

  1. Install Python 3.6
  2. Install PyTorch v0.3.1, preferably with CUDA – running with GPU acceleration is highly recommended for this code. Note that PyTorch 0.4 is not supported.
  3. If you would also like to extract your own image features, install Torch, torch-hdf5, torch/image/, torch/loadcaffe/, and optionally torch/cutorch/, torch/cudnn/, and torch/cunn/ for GPU acceleration. Alternatively, you could directly use the precomputed features provided below.
  4. Get the source:
git clone https://github.com/batra-mlp-lab/visdial-rl.git visdial-pytorch
  1. Install requirements into the visdial-rl-pytorch virtual environment, using Anaconda:
conda env create -f env.yml

Usage

Preprocess data using the following scripts OR directly download preprocessed data below.

Preprocessing VisDial

Download and preprocess VisDial as described in the visdial repo. Note: This requires Torch to run. Scroll down further if you would like to directly use precomputed features.

cd data/
python prepro.py -version 0.5 -download 1

# To process VisDial v0.9, run:
# python prepro.py -version 0.9 -download 1 -input_json_train visdial_0.9_train.json \
#                                           -input_json_val visdial_0.9_val.json

cd ..

This will generate the files data/visdial/chat_processed_data.h5 (containing tokenized captions, questions, answers, and image indices), and data/visdial/chat_processed_params.json (containing vocabulary mappings and COCO image ID's).

Extracting image features

To extract image features using VGG-19, run the following:

sh data/download_model.sh vgg 19
cd data

th prepro_img_vgg19.lua -imageRoot /path/to/coco/images -gpuid 0

Similary, to extract features using ResNet, run:

sh data/download_model.sh resnet 200
cd data
th prepro_img_resnet.lua -imageRoot /path/to/coco/images -cnnModel /path/to/t7/model -gpuid 0

Running either of the above will generate data/visdial/data_img.h5 containing features for COCO train and val splits.

Download preprocessed data

Download preprocessed dataset and extracted features:

sh scripts/download_preprocessed.sh

Pre-trained checkpoints

Download pre-trained checkpoints:

sh scripts/download_checkpoints.sh

Demo

A demo of inference for question and answer generation is available in inference.ipynb.

Training

The model definitions supported for training models are included in the models/ folder -- we presently support the hre-ques-lateim-hist encoder with generative decoding.

The arguments to train.py are listed in options.py. There are three training modes available - sl-abot, sl-qbot for supervised learning (pre-training) of A-Bot and Q-Bot respectively, and rl-full-QAf for RL fine-tuning of both A-Bot and Q-Bot beginning from specified SL pre-trained checkpoints. full-QAf denotes that all components of each agent (dialog component and/or image prediction component) are fine-tuned.

For supervised pre-training:

python train.py -useGPU -trainMode sl-abot

For RL fine-tuning:

python train.py -useGPU \
   -trainMode rl-full-QAf \
   -startFrom checkpoints/abot_sl_ep60.vd \
   -qstartFrom checkpoints/qbot_sl_ep60.vd

Logging

The code supports logging several metrics via visdom. These include train and val loss curves, VisDial metrics (mean rank, reciprocal mean rank, recall@1/5/10 for the answerer, and percentile mean rank for the questioner). To enable visdom logging, use the enableVisdom option along with other visdom server settings in options.py. A standalone visdom server can be started using:

python -m visdom.server -p <port>

Now you can navigate to localhost:<port> on your local machine and select the appropriate environment from the drop down to visualize the plots. For example, if I want to start a sl-abot job which logs plots by connecting to the above visdom server (hosted at localhost:<port>), the following command may be used to create an environment titled my-abot-job:

python train.py -useGPU \
    -trainMode sl-abot \
    -enableVisdom 1 \
    -visdomServer http://127.0.0.1 \
    -visdomServerPort <port> \
    -visdomEnv my-abot-job

Evaluation

The three types of evaluation - (1) ranking A-Bot's answers, (2) ranking Q-Bot's image predictions and (3) ranking Q-Bot's predictions when interacting with an A-Bot, are arguments QBotRank, ABotRank and QABotsRank respectively to evalMode. Any subset of them can be given as a list to evalMode. All evaluation outputs are displayed on visdom, so an active visdom server is required to run evaluation.

For evaluation of Q-Bot on image guessing and A-Bot on answer ranking on human-human dialog (ground truth captions, questions and answers), the following command can be used:

python evaluate.py -useGPU \
    -startFrom checkpoints/abot_sl_ep60.vd \
    -qstartFrom checkpoints/qbot_sl_ep60.vd \
    -enableVisdom 1 \
    -visdomServer http://127.0.0.1 \
    -visdomServerPort <port> \
    -visdomEnv my-eval-job \
    -evalMode ABotRank QBotRank

For evaluation of Q-Bot on image guessing when interacting with an A-Bot, the following command can be used. Since no human-human dialog (ground truth) is shown to the agents at this stage, ground truth captions are not used. Instead, captions need to be read from chat_processed_data_gencaps.h5, which contains preprocessed captions generated from neuraltalk2. This file provides the VisDial 0.5 test split where original ground truth captions are replaced by generated captions.

python evaluate.py -useGPU \
    -inputQues data/visdial/chat_processed_data_gencaps.h5 \
    -startFrom checkpoints/abot_sl_ep60.vd \
    -qstartFrom checkpoints/qbot_sl_ep60.vd \
    -enableVisdom 1 \
    -visdomServer http://127.0.0.1 \
    -visdomServerPort <port> \
    -visdomEnv my-eval-job \
    -evalMode QABotsRank

Benchmarks

Here are some benchmarked results for both Agents on the VisDial 0.5 test split.

Questioner

The plots below show percentile mean rank (PMR) numbers obtained on evaluating the questioner for the SL-pretrained and RL-full-QAf settings, when evaluated on generated dialog (with the two agents interacting with each other along with being provided a generated caption instead of ground truth) based image retrieval.

We have also experimented with other hyperparameter settings and found that scaling the cross entropy loss lead to a significant improvement in PMR. Namely, setting CELossCoeff to 1 and lrDecayRate to 0.999962372474343 lead to the PMR values shown on the right. The corresponding pre-trained checkpoints are available for download and are denoted by a _delta suffix.

Note that RL fine tuning begins with annealing i.e. the RL objective is gradually eased in from the last round (round 10) to the first round of dialog. Every epoch after the first one begins be decreasing the number of rounds for which supervised pre-training is used. The following plots show the RL-Full-QAf model results at epoch 10 (when annealing ends) as well as epoch 20.

qbot-generated qbot-delta-generated

Answerer

The table below shows evaluation performance of the trained answerer on the VisDial answering metrics. These metrics measure the answer retrieval performance of the A-Bot given image, human-human (ground truth) dialog and ground truth caption as input. Note that the epoch number is consistent across A-Bot and Q-Bot. The SL-pretraining epoch denotes the checkpoint from which the corresponding RL-finetuning was started.

Checkpoint Epoch MR MRR R1 R5 R10
SL-Pretrain 60 21.94 0.432 33.21 52.67 59.23
RL-Full_QAf 10 21.63 0.434 33.29 53.10 59.70
RL-Full-QAf 20 21.58 0.433 33.22 53.09 59.64

Similar as above, we find better performance for the Δ (Delta) hyperparameter setting (which downscales scales the cross entropy loss).

Checkpoint Epoch MR MRR R1 R5 R10
SL-Pretrain-Delta 15 21.02 0.434 33.02 53.51 60.45
RL-Full_QAf-Delta 10 21.61 0.410 30.38 51.61 59.30
RL-Full-QAf-Delta 20 22.80 0.377 26.64 49.48 57.46

Visualizing Results

To generate dialog for visualization, run evaluate.py with evalMode set to dialog.

python evaluate.py -useGPU \
    -startFrom checkpoints/abot_rl_ep20.vd \
    -qstartFrom checkpoints/qbot_rl_ep20.vd \
    -inputQues data/visdial/chat_processed_data_gencaps.h5 \
    -evalMode dialog \
    -cocoDir /path/to/coco/images/ \
    -cocoInfo /path/to/coco.json \
    -beamSize 5

This generates a json file dialog_output/results/results.json. Now to visualize the generated dialog, run:

cd dialog_output/
python -m http.server 8000

Navigate to localhost:8000 in your browser to see the results! The page should look as follows.

visualization

Reference

If you use this code as part of any published research, please cite this repo as well as Das and Kottur et. al., Learning Cooperative Visual Dialog Agents with Deep Reinforcement Learning.

@misc{modhe2018visdialrlpytorch
   author = {Modhe, Nirbhay and Prabhu, Viraj and Cogswell, Michael and Kottur, Satwik and Das, Abhishek and Lee, Stefan and Parikh, Devi and Batra, Dhruv },
   title = {VisDial-RL-PyTorch},
   year = {2018},
   publisher = {GitHub}.
   journal = {GitHub repository},
   howpublished = {\url{https://github.com/batra-mlp-lab/visdial-rl.git}}
}

@inproceedings{das2017visdialrl,
  title={Learning Cooperative Visual Dialog Agents with Deep Reinforcement Learning},
  author={Abhishek Das and Satwik Kottur and Jos\'e M.F. Moura and
    Stefan Lee and Dhruv Batra},
  booktitle={Proceedings of the IEEE International Conference on Computer Vision (ICCV)},
  year={2017}
}

Acknowledgements

We would like to thank Ayush Shrivastava for his help with testing this codebase.

License

BSD