def default(self, o):
        raise TypeError("%r is not JSON serializable" % (o,))
l2_norm() test using known inputs
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/_internal/django/utils/simplejson/encoder.py/JSONEncoder.default--crossover with--dataset/ETHPy150Open taherh/pysimsearch/pysimsearch/test/term_vec_test.py/TermVecTest.test_l2_norm