Tests

SBDataset: Only download noval file when image_set='train_noval' #2888

Job	Run time
onnx / linux-job	37s
unittests-extended / linux-job	33s
unittests-macos (3.10, macos-m1-stable) / macos-job	52s
unittests-macos (3.12, macos-m1-stable) / macos-job	56s
unittests-macos (3.11, macos-m1-stable) / macos-job	1m 5s
unittests-macos (3.8, macos-m1-stable) / macos-job	1m 3s
unittests-macos (3.9, macos-m1-stable) / macos-job	52s
unittests-windows (3.10, windows.4xlarge, cpu) / windows-job	3m 15s
unittests-windows (3.11, windows.4xlarge, cpu) / windows-job	2m 35s
unittests-windows (3.12, windows.4xlarge, cpu) / windows-job	3m 7s
unittests-windows (3.8, windows.4xlarge, cpu) / windows-job	2m 39s
unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	38s
unittests-windows (3.9, windows.4xlarge, cpu) / windows-job	2m 38s
unittests-linux (3.10, linux.12xlarge, cpu) / linux-job	39s
unittests-linux (3.11, linux.12xlarge, cpu) / linux-job	29s
unittests-linux (3.12, linux.12xlarge, cpu) / linux-job	35s
unittests-linux (3.8, linux.12xlarge, cpu) / linux-job	36s
unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	57s
unittests-linux (3.9, linux.12xlarge, cpu) / linux-job	42s
	24m 48s

Provide feedback