text: import inspect
  import os.path as op                      # system functions
  
  from ....interfaces import io as nio           # Data i/o
  from ....interfaces import utility as util     # utility
  from ....pipeline import engine as pe          # pypeline engine
  from ....interfaces import fsl as fsl
  from ....interfaces import freesurfer as fs    # freesurfer
  from ....interfaces import mrtrix as mrtrix
  from ....interfaces import cmtk as cmtk
  from ....interfaces import dipy as dipy
  from ....algorithms import misc as misc
  from ..fsl.epi import create_eddy_correct_pipeline
  from ..connectivity.nx import create_networkx_pipeline, create_cmats_to_csv_pipeline
  from ....interfaces.utility import Function
  from ...misc.utils import select_aparc_annot
  
  
  def create_connectivity_pipeline(name="connectivity", parcellation_name='scale500'):
      """Creates a pipeline that does the same connectivity processing as in the
      :ref:`example_dmri_connectivity_advanced` example script. Given a subject id (and completed Freesurfer reconstruction)
      diffusion-weighted image, b-values, and b-vectors, the workflow will return the subject's connectome
      as a Connectome File Format (CFF) file for use in Connectome Viewer (http://www.cmtk.org).
  
      Example
      -------
  
      >>> from nipype.workflows.dmri.mrtrix.connectivity_mapping import create_connectivity_pipeline
      >>> conmapper = create_connectivity_pipeline("nipype_conmap")
      >>> conmapper.inputs.inputnode.subjects_dir = '.'
      >>> conmapper.inputs.inputnode.subject_id = 'subj1'
      >>> conmapper.inputs.inputnode.dwi = 'data.nii.gz'
      >>> conmapper.inputs.inputnode.bvecs = 'bvecs'
      >>> conmapper.inputs.inputnode.bvals = 'bvals'
      >>> conmapper.run()                 # doctest: +SKIP
  
      Inputs::
  
          inputnode.subject_id
          inputnode.subjects_dir
          inputnode.dwi
          inputnode.bvecs
          inputnode.bvals
          inputnode.resolution_network_file
  
      Outputs::
  
          outputnode.connectome
          outputnode.cmatrix
          outputnode.networks
          outputnode.fa
          outputnode.struct
          outputnode.tracts
          outputnode.rois
          outputnode.odfs
          outputnode.filtered_tractography
          outputnode.tdi
          outputnode.nxstatscff
          outputnode.nxcsv
          outputnode.cmatrices_csv
          outputnode.mean_fiber_length
          outputnode.median_fiber_length
          outputnode.fiber_length_std
      """
  
      inputnode_within = pe.Node(util.IdentityInterface(fields=["subject_id",
                                                                "dwi",
                                                                "bvecs",
                                                                "bvals",
                                                                "subjects_dir",
                                                                "resolution_network_file"]),
                                 name="inputnode_within")
  
      FreeSurferSource = pe.Node(interface=nio.FreeSurferSource(), name='fssource')
      FreeSurferSourceLH = pe.Node(interface=nio.FreeSurferSource(), name='fssourceLH')
      FreeSurferSourceLH.inputs.hemi = 'lh'
  
      FreeSurferSourceRH = pe.Node(interface=nio.FreeSurferSource(), name='fssourceRH')
      FreeSurferSourceRH.inputs.hemi = 'rh'
  
      """
      Creating the workflow's nodes
      =============================
      """
  
      """
      Conversion nodes
      ----------------
      """
  
      """
      A number of conversion operations are required to obtain NIFTI files from the FreesurferSource for each subject.
      Nodes are used to convert the following:
          * Original structural image to NIFTI
          * Pial, white, inflated, and spherical surfaces for both the left and right hemispheres are converted to GIFTI for visualization in ConnectomeViewer
          * Parcellated annotation files for the left and right hemispheres are also converted to GIFTI
  
      """
  
      mri_convert_Brain = pe.Node(interface=fs.MRIConvert(), name='mri_convert_Brain')
      mri_convert_Brain.inputs.out_type = 'nii'
      mri_convert_ROI_scale500 = mri_convert_Brain.clone('mri_convert_ROI_scale500')
  
      mris_convertLH = pe.Node(interface=fs.MRIsConvert(), name='mris_convertLH')
      mris_convertLH.inputs.out_datatype = 'gii'
      mris_convertRH = mris_convertLH.clone('mris_convertRH')
      mris_convertRHwhite = mris_convertLH.clone('mris_convertRHwhite')
      mris_convertLHwhite = mris_convertLH.clone('mris_convertLHwhite')
      mris_convertRHinflated = mris_convertLH.clone('mris_convertRHinflated')
      mris_convertLHinflated = mris_convertLH.clone('mris_convertLHinflated')
      mris_convertRHsphere = mris_convertLH.clone('mris_convertRHsphere')
      mris_convertLHsphere = mris_convertLH.clone('mris_convertLHsphere')
      mris_convertLHlabels = mris_convertLH.clone('mris_convertLHlabels')
      mris_convertRHlabels = mris_convertLH.clone('mris_convertRHlabels')
  
      """
      Diffusion processing nodes
      --------------------------
  
      .. seealso::
  
          dmri_mrtrix_dti.py
              Tutorial that focuses solely on the MRtrix diffusion processing
  
          http://www.brain.org.au/software/mrtrix/index.html
              MRtrix's online documentation
      """
  
      """
      b-values and b-vectors stored in FSL's format are converted into a single encoding file for MRTrix.
      """
  
      fsl2mrtrix = pe.Node(interface=mrtrix.FSL2MRTrix(), name='fsl2mrtrix')
  
      """
      Distortions induced by eddy currents are corrected prior to fitting the tensors.
      The first image is used as a reference for which to warp the others.
      """
  
      eddycorrect = create_eddy_correct_pipeline(name='eddycorrect')
      eddycorrect.inputs.inputnode.ref_num = 1
  
      """
      Tensors are fitted to each voxel in the diffusion-weighted image and from these three maps are created:
          * Major eigenvector in each voxel
          * Apparent diffusion coefficient
          * Fractional anisotropy
      """
  
      dwi2tensor = pe.Node(interface=mrtrix.DWI2Tensor(), name='dwi2tensor')
      tensor2vector = pe.Node(interface=mrtrix.Tensor2Vector(), name='tensor2vector')
      tensor2adc = pe.Node(interface=mrtrix.Tensor2ApparentDiffusion(), name='tensor2adc')
      tensor2fa = pe.Node(interface=mrtrix.Tensor2FractionalAnisotropy(), name='tensor2fa')
      MRconvert_fa = pe.Node(interface=mrtrix.MRConvert(), name='MRconvert_fa')
      MRconvert_fa.inputs.extension = 'nii'
  
      """
  
      These nodes are used to create a rough brain mask from the b0 image.
      The b0 image is extracted from the original diffusion-weighted image,
      put through a simple thresholding routine, and smoothed using a 3x3 median filter.
      """
  
      MRconvert = pe.Node(interface=mrtrix.MRConvert(), name='MRconvert')
      MRconvert.inputs.extract_at_axis = 3
      MRconvert.inputs.extract_at_coordinate = [0]
      threshold_b0 = pe.Node(interface=mrtrix.Threshold(), name='threshold_b0')
      median3d = pe.Node(interface=mrtrix.MedianFilter3D(), name='median3d')
  
      """
      The brain mask is also used to help identify single-fiber voxels.
      This is done by passing the brain mask through two erosion steps,
      multiplying the remaining mask with the fractional anisotropy map, and
      thresholding the result to obtain some highly anisotropic within-brain voxels.
      """
  
      erode_mask_firstpass = pe.Node(interface=mrtrix.Erode(), name='erode_mask_firstpass')
      erode_mask_secondpass = pe.Node(interface=mrtrix.Erode(), name='erode_mask_secondpass')
      MRmultiply = pe.Node(interface=mrtrix.MRMultiply(), name='MRmultiply')
      MRmult_merge = pe.Node(interface=util.Merge(2), name='MRmultiply_merge')
      threshold_FA = pe.Node(interface=mrtrix.Threshold(), name='threshold_FA')
      threshold_FA.inputs.absolute_threshold_value = 0.7
  
      """
      For whole-brain tracking we also require a broad white-matter seed mask.
      This is created by generating a white matter mask, given a brainmask, and
      thresholding it at a reasonably high level.
      """
  
      bet = pe.Node(interface=fsl.BET(mask=True), name='bet_b0')
      gen_WM_mask = pe.Node(interface=mrtrix.GenerateWhiteMatterMask(), name='gen_WM_mask')
      threshold_wmmask = pe.Node(interface=mrtrix.Threshold(), name='threshold_wmmask')
      threshold_wmmask.inputs.absolute_threshold_value = 0.4
  
      """
      The spherical deconvolution step depends on the estimate of the response function
      in the highly anisotropic voxels we obtained above.
  
      .. warning::
  
          For damaged or pathological brains one should take care to lower the maximum harmonic order of these steps.
  
      """
  
      estimateresponse = pe.Node(interface=mrtrix.EstimateResponseForSH(), name='estimateresponse')
      estimateresponse.inputs.maximum_harmonic_order = 6
      csdeconv = pe.Node(interface=mrtrix.ConstrainedSphericalDeconvolution(), name='csdeconv')
      csdeconv.inputs.maximum_harmonic_order = 6
  
      """
      Finally, we track probabilistically using the orientation distribution functions obtained earlier.
      The tracts are then used to generate a tract-density image, and they are also converted to TrackVis format.
      """
  
      probCSDstreamtrack = pe.Node(interface=mrtrix.ProbabilisticSphericallyDeconvolutedStreamlineTrack(), name='probCSDstreamtrack')
      probCSDstreamtrack.inputs.inputmodel = 'SD_PROB'
      probCSDstreamtrack.inputs.desired_number_of_tracks = 150000
      tracks2prob = pe.Node(interface=mrtrix.Tracks2Prob(), name='tracks2prob')
      tracks2prob.inputs.colour = True
      MRconvert_tracks2prob = MRconvert_fa.clone(name='MRconvert_tracks2prob')
      tck2trk = pe.Node(interface=mrtrix.MRTrix2TrackVis(), name='tck2trk')
      trk2tdi = pe.Node(interface=dipy.TrackDensityMap(), name='trk2tdi')
  
      """
      Structural segmentation nodes
      -----------------------------
      """
  
      """
      The following node identifies the transformation between the diffusion-weighted
      image and the structural image. This transformation is then applied to the tracts
      so that they are in the same space as the regions of interest.
      """
  
      coregister = pe.Node(interface=fsl.FLIRT(dof=6), name='coregister')
      coregister.inputs.cost = ('normmi')
  
      """
      Parcellation is performed given the aparc+aseg image from Freesurfer.
      The CMTK Parcellation step subdivides these regions to return a higher-resolution parcellation scheme.
      The parcellation used here is entitled "scale500" and returns 1015 regions.
      """
  
      parcellate = pe.Node(interface=cmtk.Parcellate(), name="Parcellate")
      parcellate.inputs.parcellation_name = parcellation_name
  
      """
      The CreateMatrix interface takes in the remapped aparc+aseg image as well as the label dictionary and fiber tracts
      and outputs a number of different files. The most important of which is the connectivity network itself, which is stored
      as a 'gpickle' and can be loaded using Python's NetworkX package (see CreateMatrix docstring). Also outputted are various
      NumPy arrays containing detailed tract information, such as the start and endpoint regions, and statistics on the mean and
      standard deviation for the fiber length of each connection. These matrices can be used in the ConnectomeViewer to plot the
      specific tracts that connect between user-selected regions.
  
      Here we choose the Lausanne2008 parcellation scheme, since we are incorporating the CMTK parcellation step.
      """
  
      creatematrix = pe.Node(interface=cmtk.CreateMatrix(), name="CreateMatrix")
      creatematrix.inputs.count_region_intersections = True
  
      """
      Next we define the endpoint of this tutorial, which is the CFFConverter node, as well as a few nodes which use
      the Nipype Merge utility. These are useful for passing lists of the files we want packaged in our CFF file.
      The inspect.getfile command is used to package this script into the resulting CFF file, so that it is easy to
      look back at the processing parameters that were used.
      """
  
      CFFConverter = pe.Node(interface=cmtk.CFFConverter(), name="CFFConverter")
      CFFConverter.inputs.script_files = op.abspath(inspect.getfile(inspect.currentframe()))
      giftiSurfaces = pe.Node(interface=util.Merge(8), name="GiftiSurfaces")
      giftiLabels = pe.Node(interface=util.Merge(2), name="GiftiLabels")
      niftiVolumes = pe.Node(interface=util.Merge(3), name="NiftiVolumes")
      fiberDataArrays = pe.Node(interface=util.Merge(4), name="FiberDataArrays")
  
      """
      We also create a node to calculate several network metrics on our resulting file, and another CFF converter
      which will be used to package these networks into a single file.
      """
  
      networkx = create_networkx_pipeline(name='networkx')
      cmats_to_csv = create_cmats_to_csv_pipeline(name='cmats_to_csv')
      nfibs_to_csv = pe.Node(interface=misc.Matlab2CSV(), name='nfibs_to_csv')
      merge_nfib_csvs = pe.Node(interface=misc.MergeCSVFiles(), name='merge_nfib_csvs')
      merge_nfib_csvs.inputs.extra_column_heading = 'Subject'
      merge_nfib_csvs.inputs.out_file = 'fibers.csv'
      NxStatsCFFConverter = pe.Node(interface=cmtk.CFFConverter(), name="NxStatsCFFConverter")
      NxStatsCFFConverter.inputs.script_files = op.abspath(inspect.getfile(inspect.currentframe()))
  
      """
      Connecting the workflow
      =======================
      Here we connect our processing pipeline.
      """
  
      """
      Connecting the inputs, FreeSurfer nodes, and conversions
      --------------------------------------------------------
      """
  
      mapping = pe.Workflow(name='mapping')
  
      """
      First, we connect the input node to the FreeSurfer input nodes.
      """
  
      mapping.connect([(inputnode_within, FreeSurferSource, [("subjects_dir", "subjects_dir")])])
      mapping.connect([(inputnode_within, FreeSurferSource, [("subject_id", "subject_id")])])
  
      mapping.connect([(inputnode_within, FreeSurferSourceLH, [("subjects_dir", "subjects_dir")])])
      mapping.connect([(inputnode_within, FreeSurferSourceLH, [("subject_id", "subject_id")])])
  
      mapping.connect([(inputnode_within, FreeSurferSourceRH, [("subjects_dir", "subjects_dir")])])
      mapping.connect([(inputnode_within, FreeSurferSourceRH, [("subject_id", "subject_id")])])
  
      mapping.connect([(inputnode_within, parcellate, [("subjects_dir", "subjects_dir")])])
      mapping.connect([(inputnode_within, parcellate, [("subject_id", "subject_id")])])
      mapping.connect([(parcellate, mri_convert_ROI_scale500, [('roi_file', 'in_file')])])
  
      """
      Nifti conversion for subject's stripped brain image from Freesurfer:
      """
  
      mapping.connect([(FreeSurferSource, mri_convert_Brain, [('brain', 'in_file')])])
  
      """
      Surface conversions to GIFTI (pial, white, inflated, and sphere for both hemispheres)
      """
  
      mapping.connect([(FreeSurferSourceLH, mris_convertLH, [('pial', 'in_file')])])
      mapping.connect([(FreeSurferSourceRH, mris_convertRH, [('pial', 'in_file')])])
      mapping.connect([(FreeSurferSourceLH, mris_convertLHwhite, [('white', 'in_file')])])
      mapping.connect([(FreeSurferSourceRH, mris_convertRHwhite, [('white', 'in_file')])])
      mapping.connect([(FreeSurferSourceLH, mris_convertLHinflated, [('inflated', 'in_file')])])
      mapping.connect([(FreeSurferSourceRH, mris_convertRHinflated, [('inflated', 'in_file')])])
      mapping.connect([(FreeSurferSourceLH, mris_convertLHsphere, [('sphere', 'in_file')])])
      mapping.connect([(FreeSurferSourceRH, mris_convertRHsphere, [('sphere', 'in_file')])])
  
      """
      The annotation files are converted using the pial surface as a map via the MRIsConvert interface.
      One of the functions defined earlier is used to select the lh.aparc.annot and rh.aparc.annot files
      specifically (rather than e.g. rh.aparc.a2009s.annot) from the output list given by the FreeSurferSource.
      """
  
      mapping.connect([(FreeSurferSourceLH, mris_convertLHlabels, [('pial', 'in_file')])])
      mapping.connect([(FreeSurferSourceRH, mris_convertRHlabels, [('pial', 'in_file')])])
      mapping.connect([(FreeSurferSourceLH, mris_convertLHlabels, [(('annot', select_aparc_annot), 'annot_file')])])
      mapping.connect([(FreeSurferSourceRH, mris_convertRHlabels, [(('annot', select_aparc_annot), 'annot_file')])])
  
      """
      Diffusion Processing
      --------------------
      Now we connect the tensor computations:
      """
  
      mapping.connect([(inputnode_within, fsl2mrtrix, [("bvecs", "bvec_file"),
                                                       ("bvals", "bval_file")])])
      mapping.connect([(inputnode_within, eddycorrect, [("dwi", "inputnode.in_file")])])
      mapping.connect([(eddycorrect, dwi2tensor, [("outputnode.eddy_corrected", "in_file")])])
      mapping.connect([(fsl2mrtrix, dwi2tensor, [("encoding_file", "encoding_file")])])
  
      mapping.connect([(dwi2tensor, tensor2vector, [['tensor', 'in_file']]),
                       (dwi2tensor, tensor2adc, [['tensor', 'in_file']]),
                       (dwi2tensor, tensor2fa, [['tensor', 'in_file']]),
                       ])
      mapping.connect([(tensor2fa, MRmult_merge, [("FA", "in1")])])
      mapping.connect([(tensor2fa, MRconvert_fa, [("FA", "in_file")])])
  
      """
  
      This block creates the rough brain mask to be multiplied, mulitplies it with the
      fractional anisotropy image, and thresholds it to get the single-fiber voxels.
      """
  
      mapping.connect([(eddycorrect, MRconvert, [("outputnode.eddy_corrected", "in_file")])])
      mapping.connect([(MRconvert, threshold_b0, [("converted", "in_file")])])
      mapping.connect([(threshold_b0, median3d, [("out_file", "in_file")])])
      mapping.connect([(median3d, erode_mask_firstpass, [("out_file", "in_file")])])
      mapping.connect([(erode_mask_firstpass, erode_mask_secondpass, [("out_file", "in_file")])])
      mapping.connect([(erode_mask_secondpass, MRmult_merge, [("out_file", "in2")])])
      mapping.connect([(MRmult_merge, MRmultiply, [("out", "in_files")])])
      mapping.connect([(MRmultiply, threshold_FA, [("out_file", "in_file")])])
  
      """
      Here the thresholded white matter mask is created for seeding the tractography.
      """
  
      mapping.connect([(eddycorrect, bet, [("outputnode.eddy_corrected", "in_file")])])
      mapping.connect([(eddycorrect, gen_WM_mask, [("outputnode.eddy_corrected", "in_file")])])
      mapping.connect([(bet, gen_WM_mask, [("mask_file", "binary_mask")])])
      mapping.connect([(fsl2mrtrix, gen_WM_mask, [("encoding_file", "encoding_file")])])
      mapping.connect([(gen_WM_mask, threshold_wmmask, [("WMprobabilitymap", "in_file")])])
  
      """
      Next we estimate the fiber response distribution.
      """
  
      mapping.connect([(eddycorrect, estimateresponse, [("outputnode.eddy_corrected", "in_file")])])
      mapping.connect([(fsl2mrtrix, estimateresponse, [("encoding_file", "encoding_file")])])
      mapping.connect([(threshold_FA, estimateresponse, [("out_file", "mask_image")])])
  
      """
      Run constrained spherical deconvolution.
      """
  
      mapping.connect([(eddycorrect, csdeconv, [("outputnode.eddy_corrected", "in_file")])])
      mapping.connect([(gen_WM_mask, csdeconv, [("WMprobabilitymap", "mask_image")])])
      mapping.connect([(estimateresponse, csdeconv, [("response", "response_file")])])
      mapping.connect([(fsl2mrtrix, csdeconv, [("encoding_file", "encoding_file")])])
  
      """
      Connect the tractography and compute the tract density image.
      """
  
      mapping.connect([(threshold_wmmask, probCSDstreamtrack, [("out_file", "seed_file")])])
      mapping.connect([(csdeconv, probCSDstreamtrack, [("spherical_harmonics_image", "in_file")])])
      mapping.connect([(probCSDstreamtrack, tracks2prob, [("tracked", "in_file")])])
      mapping.connect([(eddycorrect, tracks2prob, [("outputnode.eddy_corrected", "template_file")])])
      mapping.connect([(tracks2prob, MRconvert_tracks2prob, [("tract_image", "in_file")])])
  
      """
      Structural Processing
      ---------------------
      First, we coregister the diffusion image to the structural image
      """
  
      mapping.connect([(eddycorrect, coregister, [("outputnode.eddy_corrected", "in_file")])])
      mapping.connect([(mri_convert_Brain, coregister, [('out_file', 'reference')])])
  
      """
      The MRtrix-tracked fibers are converted to TrackVis format (with voxel and data dimensions grabbed from the DWI).
      The connectivity matrix is created with the transformed .trk fibers and the parcellation file.
      """
  
      mapping.connect([(eddycorrect, tck2trk, [("outputnode.eddy_corrected", "image_file")])])
      mapping.connect([(mri_convert_Brain, tck2trk, [("out_file", "registration_image_file")])])
      mapping.connect([(coregister, tck2trk, [("out_matrix_file", "matrix_file")])])
      mapping.connect([(probCSDstreamtrack, tck2trk, [("tracked", "in_file")])])
      mapping.connect([(tck2trk, creatematrix, [("out_file", "tract_file")])])
      mapping.connect([(tck2trk, trk2tdi, [("out_file", "in_file")])])
      mapping.connect(inputnode_within, 'resolution_network_file',
                      creatematrix, 'resolution_network_file')
      mapping.connect([(inputnode_within, creatematrix, [("subject_id", "out_matrix_file")])])
      mapping.connect([(inputnode_within, creatematrix, [("subject_id", "out_matrix_mat_file")])])
      mapping.connect([(parcellate, creatematrix, [("roi_file", "roi_file")])])
  
      """
      The merge nodes defined earlier are used here to create lists of the files which are
      destined for the CFFConverter.
      """
  
      mapping.connect([(mris_convertLH, giftiSurfaces, [("converted", "in1")])])
      mapping.connect([(mris_convertRH, giftiSurfaces, [("converted", "in2")])])
      mapping.connect([(mris_convertLHwhite, giftiSurfaces, [("converted", "in3")])])
      mapping.connect([(mris_convertRHwhite, giftiSurfaces, [("converted", "in4")])])
      mapping.connect([(mris_convertLHinflated, giftiSurfaces, [("converted", "in5")])])
      mapping.connect([(mris_convertRHinflated, giftiSurfaces, [("converted", "in6")])])
      mapping.connect([(mris_convertLHsphere, giftiSurfaces, [("converted", "in7")])])
      mapping.connect([(mris_convertRHsphere, giftiSurfaces, [("converted", "in8")])])
  
      mapping.connect([(mris_convertLHlabels, giftiLabels, [("converted", "in1")])])
      mapping.connect([(mris_convertRHlabels, giftiLabels, [("converted", "in2")])])
  
      mapping.connect([(parcellate, niftiVolumes, [("roi_file", "in1")])])
      mapping.connect([(eddycorrect, niftiVolumes, [("outputnode.eddy_corrected", "in2")])])
      mapping.connect([(mri_convert_Brain, niftiVolumes, [("out_file", "in3")])])
  
      mapping.connect([(creatematrix, fiberDataArrays, [("endpoint_file", "in1")])])
      mapping.connect([(creatematrix, fiberDataArrays, [("endpoint_file_mm", "in2")])])
      mapping.connect([(creatematrix, fiberDataArrays, [("fiber_length_file", "in3")])])
      mapping.connect([(creatematrix, fiberDataArrays, [("fiber_label_file", "in4")])])
  
      """
      This block actually connects the merged lists to the CFF converter. We pass the surfaces
      and volumes that are to be included, as well as the tracts and the network itself. The currently
      running pipeline (dmri_connectivity_advanced.py) is also scraped and included in the CFF file. This
      makes it easy for the user to examine the entire processing pathway used to generate the end
      product.
      """
  
      mapping.connect([(giftiSurfaces, CFFConverter, [("out", "gifti_surfaces")])])
      mapping.connect([(giftiLabels, CFFConverter, [("out", "gifti_labels")])])
      mapping.connect([(creatematrix, CFFConverter, [("matrix_files", "gpickled_networks")])])
      mapping.connect([(niftiVolumes, CFFConverter, [("out", "nifti_volumes")])])
      mapping.connect([(fiberDataArrays, CFFConverter, [("out", "data_files")])])
      mapping.connect([(creatematrix, CFFConverter, [("filtered_tractography", "tract_files")])])
      mapping.connect([(inputnode_within, CFFConverter, [("subject_id", "title")])])
  
      """
      The graph theoretical metrics which have been generated are placed into another CFF file.
      """
  
      mapping.connect([(inputnode_within, networkx, [("subject_id", "inputnode.extra_field")])])
      mapping.connect([(creatematrix, networkx, [("intersection_matrix_file", "inputnode.network_file")])])
  
      mapping.connect([(networkx, NxStatsCFFConverter, [("outputnode.network_files", "gpickled_networks")])])
      mapping.connect([(giftiSurfaces, NxStatsCFFConverter, [("out", "gifti_surfaces")])])
      mapping.connect([(giftiLabels, NxStatsCFFConverter, [("out", "gifti_labels")])])
      mapping.connect([(niftiVolumes, NxStatsCFFConverter, [("out", "nifti_volumes")])])
      mapping.connect([(fiberDataArrays, NxStatsCFFConverter, [("out", "data_files")])])
      mapping.connect([(inputnode_within, NxStatsCFFConverter, [("subject_id", "title")])])
  
      mapping.connect([(inputnode_within, cmats_to_csv, [("subject_id", "inputnode.extra_field")])])
      mapping.connect([(creatematrix, cmats_to_csv, [("matlab_matrix_files", "inputnode.matlab_matrix_files")])])
      mapping.connect([(creatematrix, nfibs_to_csv, [("stats_file", "in_file")])])
      mapping.connect([(nfibs_to_csv, merge_nfib_csvs, [("csv_files", "in_files")])])
      mapping.connect([(inputnode_within, merge_nfib_csvs, [("subject_id", "extra_field")])])
  
      """
      Create a higher-level workflow
      --------------------------------------
      Finally, we create another higher-level workflow to connect our mapping workflow with the info and datagrabbing nodes
      declared at the beginning. Our tutorial can is now extensible to any arbitrary number of subjects by simply adding
      their names to the subject list and their data to the proper folders.
      """
  
      inputnode = pe.Node(interface=util.IdentityInterface(fields=["subject_id", "dwi", "bvecs", "bvals", "subjects_dir"]), name="inputnode")
  
      outputnode = pe.Node(interface=util.IdentityInterface(fields=["fa",
                                                                    "struct",
                                                                    "tracts",
                                                                    "tracks2prob",
                                                                    "connectome",
                                                                    "nxstatscff",
                                                                    "nxmatlab",
                                                                    "nxcsv",
                                                                    "fiber_csv",
                                                                    "cmatrices_csv",
                                                                    "nxmergedcsv",
                                                                    "cmatrix",
                                                                    "networks",
                                                                    "filtered_tracts",
                                                                    "rois",
                                                                    "odfs",
                                                                    "tdi",
                                                                    "mean_fiber_length",
                                                                    "median_fiber_length",
                                                                    "fiber_length_std"]),
                           name="outputnode")
  
      connectivity = pe.Workflow(name="connectivity")
      connectivity.base_output_dir = name
      connectivity.base_dir = name
  
      connectivity.connect([(inputnode, mapping, [("dwi", "inputnode_within.dwi"),
                                                  ("bvals", "inputnode_within.bvals"),
                                                  ("bvecs", "inputnode_within.bvecs"),
                                                  ("subject_id", "inputnode_within.subject_id"),
                                                  ("subjects_dir", "inputnode_within.subjects_dir")])
                            ])
  
      connectivity.connect([(mapping, outputnode, [("tck2trk.out_file", "tracts"),
                                                   ("CFFConverter.connectome_file", "connectome"),
                                                   ("NxStatsCFFConverter.connectome_file", "nxstatscff"),
                                                   ("CreateMatrix.matrix_mat_file", "cmatrix"),
                                                   ("CreateMatrix.mean_fiber_length_matrix_mat_file", "mean_fiber_length"),
                                                   ("CreateMatrix.median_fiber_length_matrix_mat_file", "median_fiber_length"),
                                                   ("CreateMatrix.fiber_length_std_matrix_mat_file", "fiber_length_std"),
                                                   ("CreateMatrix.matrix_files", "networks"),
                                                   ("CreateMatrix.filtered_tractographies", "filtered_tracts"),
                                                   ("merge_nfib_csvs.csv_file", "fiber_csv"),
                                                   ("mri_convert_ROI_scale500.out_file", "rois"),
                                                   ("trk2tdi.out_file", "tdi"),
                                                   ("csdeconv.spherical_harmonics_image", "odfs"),
                                                   ("mri_convert_Brain.out_file", "struct"),
                                                   ("MRconvert_fa.converted", "fa"),
                                                   ("MRconvert_tracks2prob.converted", "tracks2prob")])
                            ])
  
      connectivity.connect([(cmats_to_csv, outputnode, [("outputnode.csv_file", "cmatrices_csv")])])
      connectivity.connect([(networkx, outputnode, [("outputnode.csv_files", "nxcsv")])])
      return connectivity
  