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: Image collection for ILSVRC classification task is the same as the strategy employed for constructingImageNet (Deng et al.,, 2009). Training images are taken directly from ImageNet. Additionalimages are collected for the ILSVRC using this strategy and randomly partitioned into the validation and test sets.

Question: How are the images for this challenge collected for each category?
Training images are taken directly from ImageNet. Additional images are collected for the ILSVRC using this strategy and randomly partitioned into the validation and test sets.