You will be shown an excerpt from a computer science scientific research paper, followed by a question about the paper. Please answer the question. Do not include any text in your response other than the answer.

Context: contains 250kdatabase images downloaded from Google Street Viewand 24k test queries generated from Street View but taken at differenttimes, years apart.We divide this dataset into three roughly equal partsfor training, validation and testing,each containing around 83kdatabase images and 8k queries,where the division was done geographically to ensure the sets containindependent images.To facilitate faster training, for some experiments,a smaller subset (Pitts30k) is used, containing 10k database imagesin each of the train/val(idation)/test sets, which arealso geographically disjoint.

Question: Did the authors use the entire Pittsburgh (Pitts250k) dataset for experiments or did they use a subset of the dataset?
They use the entire (Pitts30k) dataset and divide it into three equal parts for training, validation and testing, each containing around 83k database images and 8k queries which are geographically disjoint. However, for some experiments for the seek of facility and faster training, a smaller subset (Pitts30k) is used, containing 10k database images in each of the train/val/test sets, and also geographically disjoint.