Merge pull request fizyr#997 from martinzlocha/patch-1

Check validity of the config to avoid silent errors.

keras_retinanet/utils/config.py

@@ -22,7 +22,18 @@
 
 def read_config_file(config_path):
     config = configparser.ConfigParser()
-    config.read(config_path)
+
+    with open(config_path, 'r') as file:
+        config.read_file(file)
+
+    assert 'anchor_parameters' in config, \
+        "Malformed config file. Verify that it contains the anchor_parameters section."
+
+    config_keys = set(config['anchor_parameters'])
+    default_keys = set(AnchorParameters.default.__dict__.keys())
+
+    assert config_keys <= default_keys, \
+        "Malformed config file. These keys are not valid: {}".format(config_keys - default_keys)
 
     return config