Drops support for python 3.6 (#726)

* Drop python 3.6

* Relax unit test

* Relax unit test (correctly)

.github/workflows/pytest.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-18.04
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
         use-conda: [true, false]
         use-dist: [false]
         include:

README.md

@@ -42,16 +42,15 @@ we refer to
     In: Proceedings of the conference on Learning and Intelligent OptimizatioN (LION 5)
 
 
-SMAC v3 is written in Python3 and continuously tested with Python 3.6 and
-python3.6. Its [Random Forest](https://github.com/automl/random_forest_run)
-is written in C++.
+SMAC v3 is written in Python3 and continuously tested with Python 3.7, 3.8 and 3.9. 
+Its [Random Forest](https://github.com/automl/random_forest_run) is written in C++.
 
 # Installation
 
 ## Requirements
 
 Besides the listed requirements (see `requirements.txt`), the random forest
-used in SMAC3 requires SWIG (>= 3.0, <4.0) as a build dependency:
+used in SMAC3 requires SWIG as a build dependency:
 
 ```apt-get install swig```
 

doc/index.rst

@@ -55,7 +55,7 @@ Contents:
      |    howpublished={\\url{https://github.com/automl/SMAC3}}
      | }
 
-SMAC3 is mainly written in Python 3 and continuously tested with Python 3.6-3.8.
+SMAC3 is mainly written in Python 3 and continuously tested with Python 3.7-3.9.
 Its `Random Forest <https://github.com/automl/random_forest_run>`_ is written in
 C++11.
 

setup.py

@@ -30,7 +30,7 @@ def get_author():
 
 
 setup(
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     install_requires=requirements,
     extras_require=extras_require,
     package_data={'smac': ['requirements.txt', 'extras_require.json']},

smac/__init__.py

@@ -29,8 +29,8 @@
             package_name = 'skopt'
         lazy_import.lazy_module(package_name)
 
-if sys.version_info < (3, 6, 0):
-    raise ValueError("SMAC requires Python 3.6.0 or newer.")
+if sys.version_info < (3, 7, 0):
+    raise ValueError("SMAC requires Python 3.7.0 or newer.")
 
 
 if os.name != 'posix':

test/test_epm/test_rf_with_instances.py

@@ -285,7 +285,10 @@ def test_rf_on_sklearn_data(self):
                 model.train(X_train, y_train)
                 y_hat, mu_hat = model.predict(X_test)
                 mae = np.mean(np.abs(y_hat - y_test), dtype=np.float128)
-                self.assertAlmostEqual(mae, maes[i], msg=('Do log: %s, iteration %i' % (str(do_log), i)))
+                self.assertAlmostEqual(mae, maes[i], msg=('Do log: %s, iteration %i' % (str(do_log), i)),
+                                       # We observe a difference of around 0.00017
+                                       # in github actions if doing log
+                                       places=3 if do_log else 7)
 
     def test_impute_inactive_hyperparameters(self):
         cs = smac.configspace.ConfigurationSpace()

test/test_smbo/test_smbo.py

@@ -1,5 +1,4 @@
 import shutil
-import sys
 import time
 import unittest
 from unittest import mock
@@ -278,7 +277,6 @@ def test_no_initial_design(self):
         smbo.start()
         self.assertEqual(smbo.initial_design_configs[0], smbo.scenario.cs.get_default_configuration())
 
-    @unittest.skipIf(sys.version_info < (3, 6), 'distributed requires Python >=3.6')
     def test_ta_integration_to_smbo(self):
         """
         In SMBO. 3 objects need to actively comunicate:

test/test_tae/test_parallel_runner.py

@@ -1,5 +1,4 @@
 import os
-import sys
 import tempfile
 import time
 import unittest
@@ -29,7 +28,6 @@ def target_delayed(x, seed, instance):
     return x ** 2, {'key': seed, 'instance': instance}
 
 
-@unittest.skipIf(sys.version_info < (3, 6), 'distributed requires Python >=3.6')
 class TestDaskRunner(unittest.TestCase):
 
     def setUp(self):