[tune] logger refactor part 1: move classes and utilities to own files (#11746)

* [tune] logger refactor part 1: move classes and utilities to own files

* Fix circular dependency

* Remove uneeded pretty print copy

* Apply suggestions from code review

python/ray/tune/tests/test_cluster.py

@@ -19,7 +19,7 @@ from ray.tune.ray_trial_executor import RayTrialExecutor
 from ray.tune.resources import Resources
 from ray.tune.suggest import BasicVariantGenerator
 from ray.tune.syncer import CloudSyncer
-from ray.tune.trainable import TrainableUtil
+from ray.tune.utils.trainable import TrainableUtil
 from ray.tune.trial import Trial
 from ray.tune.trial_runner import TrialRunner
 from ray.tune.utils.mock import (MockDurableTrainer, MockRemoteTrainer,

python/ray/tune/tests/test_function_api.py

@@ -9,7 +9,7 @@ from ray.rllib import _register_all
 
 from ray import tune
 from ray.tune.logger import NoopLogger
-from ray.tune.trainable import TrainableUtil
+from ray.tune.utils.trainable import TrainableUtil
 from ray.tune.function_runner import with_parameters, wrap_function, \
     FuncCheckpointUtil
 from ray.tune.result import TRAINING_ITERATION

python/ray/tune/tests/test_trainable_util.py

@@ -5,7 +5,7 @@ import unittest
 
 import ray.utils
 
-from ray.tune.trainable import TrainableUtil
+from ray.tune.utils.trainable import TrainableUtil
 
 
 class TrainableUtilTest(unittest.TestCase):

python/ray/tune/tests/test_trial_runner_callbacks.py

@@ -13,7 +13,8 @@ from ray.tune.ray_trial_executor import RayTrialExecutor
 from ray.tune.result import TRAINING_ITERATION
 
 from ray.tune.trial import Trial
-from ray.tune.trial_runner import Callback, TrialRunner
+from ray.tune.callback import Callback
+from ray.tune.trial_runner import TrialRunner
 
 
 class TestCallback(Callback):
@@ -45,7 +46,7 @@ class TestCallback(Callback):
     def on_trial_complete(self, **info):
         self.state["trial_complete"] = info
 
-    def on_trial_fail(self, **info):
+    def on_trial_error(self, **info):
         self.state["trial_fail"] = info