code: def coerce(x, y):
      if x not in "fdFD":
          x = "d"
      if y not in "fdFD":
          y = "d"
      return _coerce_rules[x, y]
  
imports: from numpy import asanyarray, asarray, array, zeros
  from scipy.sparse.linalg._interface import aslinearoperator, LinearOperator, IdentityOperator
label_desc: Use image node_id 1 for calling a global function with example usage: coerce(x, y) and returns: _coerce_rules