Table 1.

Number of biopsy-confirmed lesions and number of mammogram images presenting no lesions, benign lesions, and malignant lesions in the training, validation and test set

	images			lesions
	negative	benign	malignant	benign	malignant
training	808,730	5,188	1,648	5,602	1,790
validation	123,130	687	110	722	128
test	60,959	432	116	464	136
overall	992,819	6,307	1,874	6,788	2,054