Maps data(sets) into a GiftiImage, and optionally saves it to disc.
| Parameters: | ds : AttrDataset or numpy.ndarray
filename : basestring or None, optional
encoding : “ASCII” or “Base64Binary” or “GZipBase64Binary”, optional
surface : mvpa2.surf.nibabel.surf.Surface or str, optional
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| Returns: | img : GiftiImage
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