code: def _clear_cache(self):
      if hasattr(self, "_cached_kernel_mat"):
          del self._cached_kernel_mat
      if hasattr(self, "_cached_kernel_inv_root"):
          del self._cached_kernel_inv_root
  
imports: import copy
  import math
  from typing import Optional, Tuple
  import torch
  from linear_operator import to_dense
  from linear_operator.operators import DiagLinearOperator, LowRankRootAddedDiagLinearOperator, LowRankRootLinearOperator, MatmulLinearOperator
  from linear_operator.utils.cholesky import psd_safe_cholesky
  from torch import Tensor
  from ..None import settings
  from ..distributions import MultivariateNormal
  from ..likelihoods import Likelihood
  from ..mlls import InducingPointKernelAddedLossTerm
  from ..models import exact_prediction_strategies
  from .kernel import Kernel
label_desc: Use image node_id 2 for calling the InducingPointKernel obj's underlying member method code with example usage: obj._clear_cache() without return types