fix h5 saving.

Author: Oceania2018

src/TensorFlowNET.Keras/Saving/hdf5_format.cs

@@ -179,7 +179,6 @@ public static void save_weights_to_hdf5_group(long f, List<ILayer> layers)
             Hdf5.WriteAttribute(f, "backend", "tensorflow");
             Hdf5.WriteAttribute(f, "keras_version", "2.5.0");
 
-            long g = 0, crDataGroup=0;
             foreach (var layer in layers)
             {
                 var weights = _legacy_weights(layer);
@@ -191,20 +190,20 @@ public static void save_weights_to_hdf5_group(long f, List<ILayer> layers)
                 foreach (var weight in weights)
                     weight_names.Add(weight.Name);
 
-                g = Hdf5.CreateOrOpenGroup(f, Hdf5Utils.NormalizedName(layer.Name));
+                var g = Hdf5.CreateOrOpenGroup(f, Hdf5Utils.NormalizedName(layer.Name));
                 save_attributes_to_hdf5_group(g, "weight_names", weight_names.ToArray());
                 foreach (var (name, val) in zip(weight_names, weights))
                 {
                     var tensor = val.AsTensor();
                     if (name.IndexOf("/") > 1)
                     {
-                        crDataGroup = Hdf5.CreateOrOpenGroup(g, Hdf5Utils.NormalizedName(name.Split('/')[0]));
+                        var crDataGroup = Hdf5.CreateOrOpenGroup(g, Hdf5Utils.NormalizedName(name.Split('/')[0]));
                         WriteDataset(crDataGroup, name.Split('/')[1], tensor);
                         Hdf5.CloseGroup(crDataGroup);
                     }
                     else
                     {
-                        WriteDataset(crDataGroup, name, tensor);
+                        WriteDataset(g, name, tensor);
                     }
                 }
                 Hdf5.CloseGroup(g);