class_docstr: Unit test class for testing a regression model.
code: def _test_create(self, n, d, validation_set="auto"):
      # Simulate test data
      np.random.seed(42)
      sf = tc.SFrame()
  
      for i in range(d):
          sf.add_column(tc.SArray(np.random.rand(n)), inplace=True)
  
      target = np.random.rand(n)
      sf["target"] = target
      model = tc.regression.create(
          sf,
          target="target",
          features=None,
          validation_set=validation_set,
      )
      self.assertTrue(model is not None)
  
      features = sf.column_names()
      features.remove("target")
      model = tc.regression.create(
          sf,
          target="target",
          features=features,
          validation_set=validation_set,
      )
      self.assertTrue(model is not None)
  
file_path: turicreate/src/python/turicreate/test/test_regression.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import numpy
label_desc: Use image node_id 1 for calling the RegressionCreateTest obj's underlying member method code with example usage: obj._test_create(n, d, validation_set) without return types