Several datasets are available for captioning image task. The datasets are usually prepared by showing an image to a few persons and asking them to write a sentence each about the image. Through this method, several captions are generated for the same image. Having multiple options of captions helps in better generalization. The difficulty lies in the ranking of model performance. For each generation, preferably, a human has to evaluate the caption. Automatic evaluation is difficult for this task. Let's explore the Flickr8 dataset.
Exploring image captioning datasets
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