README.md

# Image Captioning using ViT and GPT2 architecture

This is my attempt to make a transformer model which takes image as the input and provides a caption for the image

## Model Architecture
It comprises of 12 ViT encoder and 12 GPT2 decoders

![Model Architecture](images/model.png)

## Training
The model was trained on the dataset Flickr30k which comprises of 30k images and 5 captions for each image
The model was trained for 8 epochs (which took 10hrs on kaggle's P100 GPU)

## Results
The model acieved a BLEU-4 score of 0.2115, CIDEr score of 0.4, METEOR score of 0.25, and SPICE score of 0.19 on the Flickr8k dataset

These are the loss curves.


![Loss graph](images/loss.png)
![perplexity graph](images/perplexity.png)

## Predictions
To predict your own images download the models.py, predict.py and the requirements.txt and then run the following commands->

`pip install -r requirements.txt`

`python predict.py`

*Predicting for the first time will take time as it has to download the model weights (1GB)*

Here are a few examples of the prediction done on the Validation dataset

![Test 1](images/test1.png)
![Test 2](images/test2.png)
![Test 3](images/test3.png)
![Test 4](images/test4.png)
![Test 5](images/test5.png)
![Test 6](images/test6.png)
![Test 7](images/test7.png)
![Test 8](images/test8.png)
![Test 9](images/test9.png)

As we can see these are not the most amazing predictions. The performance could be improved by training it further and using an even bigger dataset like MS COCO (500k captioned images)

## FAQ

Check the [full notebook](./imagecaptioning.ipynb) or [Kaggle](https://www.kaggle.com/code/ayushman72/imagecaptioning)

Download the [weights](https://drive.google.com/file/d/1X51wAI7Bsnrhd2Pa4WUoHIXvvhIcRH7Y/view?usp=drive_link) of the model