[tune] Distributed example + walkthrough (#5157)

python/ray/tune/function_runner.py

@@ -33,10 +33,11 @@ class StatusReporter(object):
         >>>     reporter(timesteps_this_iter=1)
     """
 
-    def __init__(self, result_queue, continue_semaphore):
+    def __init__(self, result_queue, continue_semaphore, logdir=None):
         self._queue = result_queue
         self._last_report_time = None
         self._continue_semaphore = continue_semaphore
+        self._logdir = logdir
 
     def __call__(self, **kwargs):
         """Report updated training status.
@@ -77,6 +78,10 @@ class StatusReporter(object):
     def _start(self):
         self._last_report_time = time.time()
 
+    @property
+    def logdir(self):
+        return self._logdir
+
 
 class _RunnerThread(threading.Thread):
     """Supervisor thread that runs your script."""
@@ -131,8 +136,8 @@ class FunctionRunner(Trainable):
         # reporting to block until finished.
         self._error_queue = queue.Queue(1)
 
-        self._status_reporter = StatusReporter(self._results_queue,
-                                               self._continue_semaphore)
+        self._status_reporter = StatusReporter(
+            self._results_queue, self._continue_semaphore, self.logdir)
         self._last_result = {}
         config = config.copy()