I am currently working on text image retrieval where basically, given a test query, I should be able to retrieve all the related images. For example- 'children playing in park', should retrieve all relevant images. I do know the evaluation metric to use for this is Precision@k. I also understand what it is.

However, i don't know how to find it since i don't have associated labels on what images are relevant for what input query. I am using Flickr30K dataset.