def __init__(self):
        self.url_match = re.compile(r'http[s]?://[^\s<>"]+|www\.[^\s<>"]+', re.MULTILINE)
Work out which indexes of the flatteneed array should be fixed if we want
dataset/ETHPy150Open SuperCowPowers/workbench/workbench/workers/url.py/URLS.__init__--crossover with--dataset/ETHPy150Open SheffieldML/GPy/GPy/util/choleskies.py/indexes_to_fix_for_low_rank