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Image captioning problem: Given an image, describe what is happening in the image.

What is the state of the art work on image captioning?

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The state of the art works on image captioning problem can be found on 'Image Captioning Challege' with MSCOCO Dataset here.

Currently, 'Tencent', A Chinese giant is on the top with an approach based on Encoder-Decoder framework. It uses deep CNNs as encoders to encode the images into a vector that contains semantic information of the image and LSTMs to decode them. They also use multi-stage attention mechanism during decoding and Reinforcement Learning to directly optimize the non-differential functions and scores like CIDEr.

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