class_docstr: ARD Kernel
  
  Parameters
  ----------
  X : np.ndarray
      The RHS factors for the GP regression
class_docstr_tok: ["ARD","Kernel","Parameters","--","--","--","--","--","X",":","np.ndarray","The","RHS","factors","for","the","GP","regression"]
docstr: Returns K(x1,x2)
  
  Parameters
  ----------
  parm : np.ndarray
      Parameters for the K(x1, x2)
  
  Xstar1 : np.ndarray
      First data subset
  
  Xstar2 : np.ndarray
      Second data subset
  
  Returns
  ----------
  - K(x1, x2)
docstr_tok: ["Returns","K","(","x1",",","x2",")","Parameters","--","--","--","--","--","parm",":","np.ndarray","Parameters","for","the","K","(","x1",",","x2",")","Xstar1",":","np.ndarray","First","data","subset","Xstar2",":","np.ndarray","Second","data","subset","Returns","--","--","--","--","--","-","K","(","x1",",","x2",")"]
code: def K_arbitrary_X(self, parm, Xstar1, Xstar2):
      """Returns K(x1,x2)
  
      Parameters
      ----------
      parm : np.ndarray
          Parameters for the K(x1, x2)
  
      Xstar1 : np.ndarray
          First data subset
  
      Xstar2 : np.ndarray
          Second data subset
  
      Returns
      ----------
      - K(x1, x2)
      """
      return ARD_K_arbitrary_X_matrix(Xstar1, Xstar2, parm)
  
imports: import sys
  import numpy
  from ..None import families
  from .kernel_routines import SE_K_matrix, SE_Kstar_matrix, SE_Kstarstar_matrix, SE_K_arbitrary_X_matrix
  from .kernel_routines import OU_K_matrix, OU_Kstar_matrix, OU_Kstarstar_matrix, OU_K_arbitrary_X_matrix
  from .kernel_routines import RQ_K_matrix, RQ_Kstar_matrix, RQ_Kstarstar_matrix, RQ_K_arbitrary_X_matrix
  from .kernel_routines import ARD_K_matrix, ARD_Kstar_matrix, ARD_Kstarstar_matrix, ARD_K_arbitrary_X_matrix
  from .kernel_routines import Periodic_K_matrix, Periodic_Kstar_matrix, Periodic_Kstarstar_matrix, Periodic_K_arbitrary_X_matrix
label_desc: Use image node_id 4 for calling the ARD obj's underlying member method code with example usage: obj.K_arbitrary_X(parm, Xstar1, Xstar2) and returns: ARD_K_arbitrary_X_matrix