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This is a pytorch implementation for Stacked Attention Networks for Image Question Answering

Train a Stacked Attention Network for Image Question Answering on VQA dataset. For more information, please refer the paper and original theano code.

Requirements

This code is written in Python and requires [PyTorch]. The preprocssinng code is in Python and Lua, and you need to install NLTK if you want to use NLTK to tokenize the question.

Download Dataset

We simply follow the steps provide by HieCoAttenVQA to prepare VQA data. The first thing you need to do is to download the data and do some preprocessing. Head over to the data/ folder and run

$ python vqa_preprocessing.py --download 1 --split 1

--download Ture means you choose to download the VQA data from the VQA website and --split 1 means you use COCO train set to train and validation set to evaluation. --split 2 means you use COCO train+val set to train and test set to evaluate. After this step, it will generate two files under the data folder. vqa_raw_train.json and vqa_raw_test.json

Download Image Model

Here we use VGG_ILSVRC_19_layers model and Deep Residual network implement by Facebook model.

Generate Image/Question Features

Head over to the prepro folder and run

$ python prepro_vqa.py --input_train_json ../data/vqa_raw_train.json --input_test_json ../data/vqa_raw_test.json --num_ans 1000

to get the question features. --num_ans specifiy how many top answers you want to use during training. You will also see some question and answer statistics in the terminal output. This will generate two files in data/ folder, vqa_data_prepro.h5 and vqa_data_prepro.json.

Then we are ready to extract the image features by VGG 19.

$ th prepro_img_vgg.lua -input_json ../data/vqa_data_prepro.json -image_root /home/jiasenlu/data/ -cnn_proto ../image_model/VGG_ILSVRC_19_layers_deploy.prototxt -cnn_model ../image_model/VGG_ILSVRC_19_layers.caffemodel

you can change the -gpuid, -backend and -batch_size based on your gpu.

Train the model

We have everything ready to train the VQA. Back to the main folder

python train.py --use_gpu <0 or 1> --batch_size <batch size> --epochs <no. of epochs>

you can also change many other options. For a list of all options, see train.py

Evaluate the model

In main folder run

python eval.py --use_gpu <0 or 1>

you can also change many other options. For a list of all options, see eval.py