from qsiprep.workflows.dwi.shoreline import init_qsiprep_hmcsdc_coreg_wf
wf = init_qsiprep_hmcsdc_wf(
    {'dwi_series':[dwi1.nii, dwi2.nii],
     'fieldmap_info': {'suffix': None},
     'dwi_series_pedir': j},
    source_file='/data/sub-1/dwi/sub-1_dwi.nii.gz',
    t2w_sdc=False,
    dwi_metadata={},
    anatomical_template='MNI152NLin2009cAsym',
)