def node_to_string(sample):
	"""
	Given a sample in list format [['0','1','0','2'], uniq_ident] converts to string format, 'Ch1|Ch2|....|Chn_Identifier'

	:param sample:
		Sample in format [['0','1','0','2'], uniq_ident]
	:return:
		String formatted version of a given sample
	"""
	return "|".join(sample[0]) + "_" + str(sample[1])