[tune] Experiment Management API (#1328)

* init for exposing external interface

* revisions

* http server

* small

* simplify

* ui

* fixes

* test

* nit

* nit

* merge

* untested

* nits

* nit

* init tests

* tests

* more tests

* nit

* fix hyperband

* cleanup

* nits

* good stuff

* cleanup

* comments and need to test

* nit

* notebook

* testing

* test and expose server

* server_tests

* docs

* periods

* fix tests

* committing test

* fi

python/ray/tune/trial.py

@@ -9,6 +9,7 @@ import ray
 import os
 
 from collections import namedtuple
+from ray.utils import random_string, binary_to_hex
 from ray.tune import TuneError
 from ray.tune.logger import NoopLogger, UnifiedLogger
 from ray.tune.result import TrainingResult, DEFAULT_RESULTS_DIR, pretty_print
@@ -105,6 +106,7 @@ class Trial(object):
         self.location = None
         self.logdir = None
         self.result_logger = None
+        self.trial_id = binary_to_hex(random_string())[:8]
 
     def start(self):
         """Starts this trial.