Change the default value of metis parameter (#1014)

* update readme in ga_squad

* update readme

* fix typo

* Update README.md

* Update README.md

* Update README.md

* update readme

* update

* fix path

* update reference

* fix bug in config file

* update nni_arch_overview.png

* update

* update

* update

* update home page

* update default value of metis tuner

src/sdk/pynni/nni/metis_tuner/metis_tuner.py

@@ -65,7 +65,7 @@ class MetisTuner(Tuner):
     https://www.microsoft.com/en-us/research/publication/metis-robustly-tuning-tail-latencies-cloud-systems/
     """
 
-    def __init__(self, optimize_mode="maximize", no_resampling=True, no_candidates=True,
+    def __init__(self, optimize_mode="maximize", no_resampling=True, no_candidates=False,
                  selection_num_starting_points=600, cold_start_num=10, exploration_probability=0.9):
         """
         Parameters