Move console logging to ConsoleWriter

ml-agents/mlagents/trainers/learn.py

     CSVWriter,
     StatsReporter,
     GaugeWriter,
+    ConsoleWriter,
 )
 from mlagents_envs.environment import UnityEnvironment
 from mlagents.trainers.sampler_class import SamplerManager
         )
         tb_writer = TensorboardWriter(summaries_dir)
         gauge_write = GaugeWriter()
+        console_writer = ConsoleWriter()
+        StatsReporter.add_writer(console_writer)
 
         if options.env_path is None:
             port = UnityEnvironment.DEFAULT_EDITOR_PORT

ml-agents/mlagents/trainers/stats.py

 import abc
 import csv
 import os
+import time
+import logging
+
+logger = logging.getLogger("mlagents.trainers")
 
 
 class StatsSummary(NamedTuple):
     ) -> None:
         for val, stats_summary in values.items():
             set_gauge(f"{category}.{val}.mean", float(stats_summary.mean))
+
+    def write_text(self, category: str, text: str, step: int) -> None:
+        pass
+
+
+class ConsoleWriter(StatsWriter):
+    def __init__(self):
+        self.training_start_time = time.time()
+
+    def write_stats(
+        self, category: str, values: Dict[str, StatsSummary], step: int
+    ) -> None:
+        is_training = "Not Training."
+        if "Is Training" in values:
+            stats_summary = stats_summary = values["Is Training"]
+            if stats_summary.mean > 0.0:
+                is_training = "Training."
+        if "Environment/Cumulative Reward" in values:
+            stats_summary = values["Environment/Cumulative Reward"]
+            logger.info(
+                "{}: Step: {}. "
+                "Time Elapsed: {:0.3f} s "
+                "Mean "
+                "Reward: {:0.3f}"
+                ". Std of Reward: {:0.3f}. {}".format(
+                    category,
+                    step,
+                    time.time() - self.training_start_time,
+                    stats_summary.mean,
+                    stats_summary.std,
+                    is_training,
+                )
+            )
+        else:
+            logger.info(
+                "{}: Step: {}. No episode was completed since last summary. {}".format(
+                    category, step, is_training
+                )
+            )
 
     def write_text(self, category: str, text: str, step: int) -> None:
         pass

ml-agents/mlagents/trainers/trainer/trainer.py

 
 from collections import deque
 
-from mlagents_envs.timers import set_gauge
 from mlagents.model_serialization import export_policy_model, SerializationSettings
 from mlagents.trainers.policy.tf_policy import TFPolicy
 from mlagents.trainers.stats import StatsReporter
         """
         Saves training statistics to Tensorboard.
         """
-        is_training = "Training." if self.should_still_train else "Not Training."
-        stats_summary = self.stats_reporter.get_stats_summaries(
-            "Environment/Cumulative Reward"
-        )
-        if stats_summary.num > 0:
-            logger.info(
-                "{}: {}: Step: {}. "
-                "Time Elapsed: {:0.3f} s "
-                "Mean "
-                "Reward: {:0.3f}"
-                ". Std of Reward: {:0.3f}. {}".format(
-                    self.run_id,
-                    self.brain_name,
-                    step,
-                    time.time() - self.training_start_time,
-                    stats_summary.mean,
-                    stats_summary.std,
-                    is_training,
-                )
-            )
-            set_gauge(f"{self.brain_name}.mean_reward", stats_summary.mean)
-        else:
-            logger.info(
-                " {}: {}: Step: {}. No episode was completed since last summary. {}".format(
-                    self.run_id, self.brain_name, step, is_training
-                )
-            )
+        self.stats_reporter.add_stat("Is Training", float(self.should_still_train))
         self.stats_reporter.write_stats(int(step))
 
     @abc.abstractmethod