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Handle data 🧠 for the NARPS open pipelines project

The datasets used for the project can be downloaded using one of the two options below.

The path to these datasets must conform with the information located in the configuration file you plan to use (cf. documentation about configuration). By default, these paths are in the repository:

  • data/original/: original data from NARPS
  • data/results/: results from NARPS teams

In the following, we assume you choose this configuration.

Option 1: with DataLad (recommended)

  1. If you don't have it installed already, install DataLad and it's dependencies from here.

Tips for people using M1 MacBooks: git-annex is not yet available for M1 MacBooks. A solution to install it can be found here.

  1. If you have cloned the Narps Open repository using DataLad with the datalad install --recusive option, then the datasets are already available in:
    • data/original/: original data from NARPS
    • data/results/: results from NARPS teams

The datalad install command only downloaded the metadata associated with the dataset ; to download the actual files run the following command:

[! WARNING] The following command lines will download all the data, which represents around :

  • 3 GB for data/results/
  • 880 GB for data/original/
# To get all the data
cd data/
datalad get --recursive ./*

If you only want parts of the data, replace the ./* by the paths to the desired files.

Option 2: manual download

Original data from NARPS

Follow the download instructions from openneuro.org for the ds001734 dataset here. You will end up typing one of these commands:

cd data/original/
openneuro download --snapshot 1.0.5 ds001734 ds001734/

# or

cd data/original/
aws s3 sync --no-sign-request s3://openneuro.org/ds001734 ds001734/

Results from NARPS teams

Stat maps from teams can be downloaded from NeuroVault (Gorgolewski & al, 2015).

The narps_open.data.results module will help you download these collections. Note that it is also possible to rectify the collection, i.e: to pre-process the images as done by the NARPS analysis team during the NARPS study.

Here is how to use the module, both using python code or with the command line:

# In a python script
from narps_open.data.results import ResultsCollectionFactory

# Create a collection factory
factory = ResultsCollectionFactory()

# Select the collections you need
teams = ['2T6S', 'C88N', 'L1A8'] # Alternatively use the keys from narps_open.pipelines.implemented_pipelines to get all the team ids
for team in teams:
    collection = factory.get_collection(team)
    collection.download() # Collections are downloaded
    collection.rectify() # Rectified versions are created

Tip

In the following examples, use narps_results or python narps_open/data/results indifferently to launch the command line tool.

# From the command line
narps_results -h
    usage: results [-h] (-t TEAMS [TEAMS ...] | -a) [-r]

    Get Neurovault collection of results from NARPS teams.

    options:
      -h, --help            show this help message and exit
      -t TEAMS [TEAMS ...], --teams TEAMS [TEAMS ...]
                            a list of team IDs
      -a, --all             download results from all teams
      -r, --rectify         rectify the results

# Either download all collections
narps_results -a

# Or select the ones you need
narps_results -t 2T6S C88N L1A8

# Download and rectify the collections
narps_results -r -t 2T6S C88N L1A8

The collections are also available here as one release on Zenodo that you can download.

Each team results collection is kept in the data/results/orig directory, in a folder using the pattern <neurovault_collection_id>_<team_id> (e.g.: 4881_2T6S for the 2T6S team).

Access NARPS data

Inside narps_open.data, several modules allow to parse data from the NARPS file, so it's easier to use it inside the Narps Open Pipelines project. These are :

narps_open.data.description

Get textual description of the pipelines, as written by the teams (see docs/description.md).

narps_open.data.results

Get the result collections, as described earlier in this file.

narps_open.data.participants

Get the participants data (parses the data/original/ds001734/participants.tsv file) as well as participants subsets to perform analyses on lower numbers of images.

narps_open.data.task

Get information about the task (parses the data/original/ds001734/task-MGT_bold.json file). Here is an example how to use it :

from narps_open.data.task import TaskInformation

task_info = TaskInformation() # task_info is a dict

# All available keys
print(task_info.keys())
# dict_keys(['TaskName', 'Manufacturer', 'ManufacturersModelName', 'MagneticFieldStrength', 'RepetitionTime', 'EchoTime', 'FlipAngle', 'MultibandAccelerationFactor', 'EffectiveEchoSpacing', 'SliceTiming', 'BandwidthPerPixelPhaseEncode', 'PhaseEncodingDirection', 'TaskDescription', 'CogAtlasID', 'NumberOfSlices', 'AcquisitionTime', 'TotalReadoutTime'])

# Original data
print(task_info['TaskName'])
print(task_info['Manufacturer'])
print(task_info['RepetitionTime']) # And so on ...

# Derived data
print(task_info['NumberOfSlices'])
print(task_info['AcquisitionTime'])
print(task_info['TotalReadoutTime'])