code: def mfpt_sensitivity(T, target, i):
      r
      # check input
      T = _types.ensure_ndarray_or_sparse(T, ndim=2, uniform=True, kind='numeric')
      target = _types.ensure_int_vector(target)
      # go
      if _issparse(T):
          _showSparseConversionWarning()
          mfpt_sensitivity(T.todense(), target, i)
      else:
          return dense.sensitivity.mfpt_sensitivity(T, target, i)
docs: r"""Sensitivity matrix of the mean first-passage time from specified state.
  
      Parameters
      ----------
      T : (M, M) ndarray
          Transition matrix
      target : int or list
          Target state or set for mfpt computation
      i : int
          Compute the sensitivity for state `i`
  
      Returns
      -------
      S : (M, M) ndarray
          Sensitivity matrix for specified state