/usr/local/lib/python2.7/dist-packages/numdifftools/limits.py:182: FutureWarning: arrays to stack must be passed as a "sequence" type such as list or tuple. Support for non-sequence iterables such as generators is deprecated as of NumPy 1.16 and will raise an error in the future.
  f_del = np.vstack(list(np.ravel(r)) for r in sequence)
/usr/local/lib/python2.7/dist-packages/numdifftools/limits.py:184: FutureWarning: arrays to stack must be passed as a "sequence" type such as list or tuple. Support for non-sequence iterables such as generators is deprecated as of NumPy 1.16 and will raise an error in the future.
  for step in steps)
/usr/local/lib/python2.7/dist-packages/numdifftools/extrapolation.py:443: RuntimeWarning: invalid value encountered in less_equal
  converged = err <= tol
/usr/local/lib/python2.7/dist-packages/numdifftools/limits.py:150: RuntimeWarning: invalid value encountered in less
  outliers = (((abs(der) < (a_median / trim_fact)) +
/usr/local/lib/python2.7/dist-packages/numdifftools/limits.py:151: RuntimeWarning: invalid value encountered in greater
  (abs(der) > (a_median * trim_fact))) * (a_median > 1e-8) +
/usr/local/lib/python2.7/dist-packages/numdifftools/limits.py:152: RuntimeWarning: invalid value encountered in less
  ((der < p25-1.5*iqr) + (p75+1.5*iqr < der)))

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