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ComputeDVARSOutputSpec instance must be a float #1795

@oesteban

Description

@oesteban

Summary

Using uncompressed nifti, nibabel opens up the images as memmap objects

Actual behavior

A trait error is raised because the value is not purely float

Expected behavior

The trait successfully accepts a float

How to replicate the behavior

Calling ComputeDVARS with an uncompressed nifti

Platform details:

Only happens with nipype<1.12.0
Any platform

Please see nipreps/mriqc#356

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