class_docstr: Unit test class for testing a regression model.
code: def test_create(self):
      self._test_create(99, 10)
      self._test_create(100, 100)
      self._test_create(20000, 10)
      self._test_create(99, 10, validation_set=None)
      self._test_create(100, 100, validation_set=None)
      self._test_create(20000, 10, validation_set=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 2 for calling the RegressionCreateTest obj's underlying member method code with example usage: obj.test_create() without return types