def ceate_feature_map(file_name,features):
outfile = open(file_name, 'w')
for i, feat in enumerate(features):
outfile.write('{0}\t{1}\tq\n'.format(i, feat))
#feature type, use i for indicator and q for quantity outfile.close()
feature_score = bst.get_fscore()
help(bst)
pd.Series(bst.get_fscore()).sort_values(ascending=False)