def append(self, position, array):
        if not Gauged.map_append(self.ptr, position, array.ptr):
            raise MemoryError
Computes the normalized term frequency as explained in http://www.tfidf.com/
dataset/ETHPy150Open chriso/gauged/gauged/structures/sparse_map.py/SparseMap.append--crossover with--dataset/ETHPy150Open miso-belica/sumy/sumy/summarizers/sum_basic.py/SumBasicSummarizer._compute_tf