code: def big_vision_linear_regression(
      x, y, x_test, y_test, l2_reg, num_classes
  ):
      """Computes fewshot regression with eigenvalue solver in big_vision."""
      # pylint: disable=protected-access (testing a private function)
      cache = bv_fewshot._precompute_cache(x, y, num_classes)
      accuracy = bv_fewshot._eig_fewshot_acc_fn(
          cache, x_test, y_test, l2_reg
      )
      # pylint: enable=protected-access
      return accuracy
  
file_path: scenic/scenic/train_lib/transfer/tests/test_fewshot_utils.py
imports: from absl.testing import absltest
  from big_vision.evaluators import fewshot
  import jax
  from jax import random
  from scenic.train_lib.transfer import fewshot_utils
label_desc: Use image node_id 1 for calling a global function with example usage: big_vision_linear_regression(x, y, x_test, y_test, l2_reg, num_classes) and returns: accuracy