fixed params file selection from the main_config (#171)

the neural_net_api only selects the first file from the param directory in the main config, now it searches explicitly for a .params file

Co-authored-by: Jannik Holmer <HolmerJannik@gmail.com>

DeepCrazyhouse/src/domain/agent/neural_net_api.py

@@ -43,7 +43,12 @@ def __init__(self, ctx="cpu", batch_size=1, select_policy_form_planes: bool = Tr
             self.symbol_path = glob.glob(model_architecture_dir + "*")[0]
 
         if model_weights_dir == "default":
-            self.params_path = glob.glob(main_config["model_weights_dir"] + "*")[0]
+            self.params_path = None
+
+            paths = glob.glob(main_config["model_weights_dir"] + "*")
+            for path in paths:
+                if ".params" in path:
+                    self.params_path = path
         else:
             self.params_path = glob.glob(model_weights_dir + "*")[0]
         # make sure the needed files have been found