def features_string_ulong_modular (start=0,order=2,gap=0,rev=False):
from modshogun import StringCharFeatures, StringUlongFeatures, RAWBYTE
from numpy import array, uint64
#create string features
cf=StringCharFeatures(['hey','guys','string'], RAWBYTE)
uf=StringUlongFeatures(RAWBYTE)
uf.obtain_from_char(cf, start,order,gap,rev)
#replace string 0
uf.set_feature_vector(array([1,2,3,4,5], dtype=uint64), 0)
return uf.get_features(),uf.get_feature_vector(2), uf.get_num_vectors()
