code: def data():
      """Sample data for regression."""
      np.random.seed(123)
      x = np.random.randn(200, 20)
      beta = np.array([50] * 18 + [0] * 2)
      alpha = np.random.randn(1)
      y = x @ beta + alpha + np.random.randn(200)
      return {"x": x, "y": y}
  
file_path: greykite/greykite/tests/algo/common/test_l1_quantile_regression.py
imports: import numpy
  import pytest
  from testfixtures import LogCapture
  from greykite.algo.common.l1_quantile_regression import QuantileRegression
  from greykite.algo.common.l1_quantile_regression import l1_quantile_regression
  from greykite.algo.common.l1_quantile_regression import ordinary_quantile_regression
  from greykite.common.logging import LOGGER_NAME
label_desc: Use image node_id 1 for calling a global function with example usage: data() and returns: dict