heuristic.py
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	import os

	def create_key(template, outtype=('nii.gz',), annotation_classes=None):

	if template is None or not template:
	raise ValueError('Template must be a valid format string')

	return template, outtype, annotation_classes

	def infotodict(seqinfo):
	"""Heuristic evaluator for determining which runs belong where
	allowed template fields - follow python string module:
	item: index within category
	subject: participant id
	session: ses-<session id>
	seqitem: run number during scanning
	subindex: sub index within group
	"""

	t1w = create_key('sub-{subject}/{session}/anat/sub-{subject}_{session}_T1w')
	dwi = create_key('sub-{subject}/{session}/dwi/sub-{subject}_{session}_dwi')
	rs = create_key('sub-{subject}/{session}/func/sub-{subject}_{session}_task-rest_bold')

	info = {t1w: [],dwi: [],rs: []}

	for idx, s in enumerate(seqinfo):
	if ('*tfl3d1_16ns' in s.sequence_name):
	info[t1w].append(s.series_id)
	if (('*ep_b0' in s.sequence_name) or ('ep_b0' in s.sequence_name)):
	info[dwi].append(s.series_id)
	if ('*epfid2d1_58' in s.sequence_name):
	info[rs].append(s.series_id)

	return info