from qsiprep.workflows.dwi.fsl import init_fsl_hmc_wf
wf = init_fsl_hmc_wf({'dwi_series': ['.../phasediff/sub-1/dwi/sub-1_dir-AP_run-1_dwi.nii.gz',
                                    '.../phasediff/sub-1/dwi/sub-1_dir-AP_run-2_dwi.nii.gz'],
                      'fieldmap_info': {'phasediff': '.../phasediff/sub-1/fmap/sub-1_phasediff.nii.gz',
                                        'magnitude1': '.../magnitude1/sub-1/fmap/sub-1_magnitude1.nii.gz',
                                        'suffix': 'phasediff'},
                      'dwi_series_pedir': 'j',
                      'concatenated_bids_name': 'sub-1_dir-AP'},
                     b0_threshold=100,
                     impute_slice_threshold=0.,
                     fmap_demean=False,
                     fmap_bspline=False,
                     eddy_config=None,
                     source_file='/path/to/dwi/sub-X_dwi.nii.gz',
                     omp_nthreads=1)