def is_url(url):
    try:
        return urlparse.urlparse(url).scheme in urlparse.uses_netloc
    except:
        return False
checks the gradient of the gradient for
dataset/ETHPy150Open daler/gffutils/gffutils/iterators.py/is_url--crossover with--dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/tensor/signal/tests/test_pool.py/TestDownsampleFactorMax.test_DownsampleFactorMaxGrad_grad_st