code: def get_fantasy_strategy(
      self,
      inputs,
      targets,
      full_inputs,
      full_targets,
      full_output,
      **kwargs,
  ):
      raise NotImplementedError(
          "Fantasy observation updates not yet supported for models using RFFs"
      )
  
imports: import functools
  import string
  import warnings
  import torch
  from linear_operator import to_dense, to_linear_operator
  from linear_operator.operators import AddedDiagLinearOperator, BatchRepeatLinearOperator, ConstantMulLinearOperator, DenseLinearOperator, InterpolatedLinearOperator, LinearOperator, LowRankRootAddedDiagLinearOperator, MaskedLinearOperator, MatmulLinearOperator, RootLinearOperator, ZeroLinearOperator
  from linear_operator.utils.cholesky import psd_safe_cholesky
  from linear_operator.utils.interpolation import left_interp, left_t_interp
  from torch import Tensor
  from ..None import settings
  from ..distributions import MultitaskMultivariateNormal
  from ..lazy import LazyEvaluatedKernelTensor
  from ..utils.memoize import add_to_cache, cached, clear_cache_hook, pop_from_cache
label_desc: Use image node_id 2 for calling the RFFPredictionStrategy obj's underlying member method code with example usage: obj.get_fantasy_strategy(inputs, targets, full_inputs, full_targets, full_output) without return types