remove warning from yaml and dbsampler (#121)

* remove warning from yaml and dbsampler

pcdet/config.py

@@ -51,9 +51,9 @@ def merge_new_config(config, new_config):
     if '_BASE_CONFIG_' in new_config:
         with open(new_config['_BASE_CONFIG_'], 'r') as f:
             try:
-                yaml_config = yaml.load(f)
-            except:
                 yaml_config = yaml.load(f, Loader=yaml.FullLoader)
+            except:
+                yaml_config = yaml.load(f)
         config.update(EasyDict(yaml_config))
 
     for key, val in new_config.items():
@@ -70,9 +70,9 @@ def merge_new_config(config, new_config):
 def cfg_from_yaml_file(cfg_file, config):
     with open(cfg_file, 'r') as f:
         try:
-            new_config = yaml.load(f)
-        except:
             new_config = yaml.load(f, Loader=yaml.FullLoader)
+        except:
+            new_config = yaml.load(f)
 
         merge_new_config(config=config, new_config=new_config)
 

pcdet/datasets/augmentor/database_sampler.py

@@ -164,7 +164,7 @@ class DataBaseSampler(object):
 
         """
         gt_boxes = data_dict['gt_boxes']
-        gt_names = data_dict['gt_names']
+        gt_names = data_dict['gt_names'].astype(str)
         existed_boxes = gt_boxes
         total_valid_sampled_dict = []
         for class_name, sample_group in self.sample_groups.items():