Neural Style Transfer -- A practice in transfer learning

The picture above is photoed by me in London. There is always an idea that pops up in my mind when I looked at it -- what if I make this picture into an oil painting? It must be a masterpiece! Thanks to Gatys et al. their article helped me dive into the beauty of Deep learning, and this whole article is based on their paper. Before we begin, let's talk something interesting: What are deep convnets really learning?