def track_from_url(url, timeout=DEFAULT_ASYNC_TIMEOUT):
    param_dict = dict(url = url)
    return _upload(param_dict, timeout, data=None)
Gradient of function, or Jacobian if function f returns 1d array
dataset/ETHPy150Open echonest/pyechonest/pyechonest/track.py/track_from_url--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tools/numdiff.py/approx_fprime