code: def test_quantile_regression_init():
      """Tests the QuantileRegression class instantiating."""
      qr = QuantileRegression()
      assert qr.quantile == 0.9
      assert qr.alpha == 0.001
      assert qr.sample_weight is None
      assert qr.feature_weight is None
      assert qr.max_iter == 100
      assert qr.tol == 1e-2
      assert qr.fit_intercept is True
      assert qr.n is None
      assert qr.p is None
      assert qr.constant_cols is None
      assert qr.nonconstant_cols is None
      assert qr.intercept_ is None
      assert qr.coef_ is None
  
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 4 for calling a global function with example usage: test_quantile_regression_init() without return types