Make 'dataset_to_infer' function correctly
Make 'dataset_to_infer' function correctly

Old version: no matter how to change the value of 'dataset_to_infer', the inferenced data are always the data in 'Inference' set.
NifTK/NiftyNet,NifTK/NiftyNet,NifTK/NiftyNet,NifTK/NiftyNet