code: def _fractional_power_pade_constant(i, t):
      # A helper function for matrix fractional power.
      if i < 1:
          raise ValueError("expected a positive integer i")
      if not (-1 < t < 1):
          raise ValueError("expected -1 < t < 1")
      if i == 1:
          return -t
      elif i % 2 == 0:
          j = i // 2
          return (-j + t) / (2 * (2 * j - 1))
      elif i % 2 == 1:
          j = (i - 1) // 2
          return (-j - t) / (2 * (2 * j + 1))
      else:
          raise Exception("internal error")
  
imports: from __future__ import division, print_function, absolute_import
  import warnings
  import numpy
  from scipy.linalg._matfuncs_sqrtm import SqrtmError, _sqrtm_triu
  from scipy.linalg.decomp_schur import schur, rsf2csf
  from scipy.linalg.matfuncs import funm
  from scipy.linalg import svdvals, solve_triangular
  from scipy.sparse.linalg.interface import LinearOperator
  from scipy.sparse.linalg import onenormest
  import scipy.special
label_desc: Use image node_id 7 for calling a global function with example usage: _fractional_power_pade_constant(i, t) and returns: unknown, unknown, unknown