code: def test_initialize_lengthscale(self):
      kernel = RQKernel()
      kernel.initialize(lengthscale=3.14)
      actual_value = torch.tensor(3.14).view_as(kernel.lengthscale)
      self.assertLess(
          torch.norm(kernel.lengthscale - actual_value), 1e-5
      )
  
file_path: gpytorch/test/kernels/test_rq_kernel.py
imports: import math
  import unittest
  import torch
  from gpytorch.kernels import RQKernel
  from gpytorch.test.base_kernel_test_case import BaseKernelTestCase
label_desc: Use image node_id 10 for calling the TestRQKernel obj's underlying member method code with example usage: obj.test_initialize_lengthscale() without return types