imporved MnistModelLoader's interface

src/TensorFlowHub/MnistModelLoader.cs

@@ -15,14 +15,27 @@ namespace Tensorflow.Hub
         private const string TEST_IMAGES = "t10k-images-idx3-ubyte.gz";
         private const string TEST_LABELS = "t10k-labels-idx1-ubyte.gz";
 
-        public static async Task<Datasets<MnistDataSet>> LoadAsync(string trainDir, bool oneHot = false)
+        public static async Task<Datasets<MnistDataSet>> LoadAsync(string trainDir, bool oneHot = false, int? trainSize = null, int? validationSize = null, int? testSize = null)
         {
             var loader = new MnistModelLoader();
-            return await loader.LoadAsync(new ModelLoadSetting
+
+            var setting = new ModelLoadSetting
             {
                 TrainDir = trainDir,
-                OneHot = oneHot
-            });
+                OneHot = oneHot,
+                TrainSize = trainSize
+            };
+
+            if (trainSize.HasValue)
+                setting.TrainSize = trainSize.Value;
+
+            if (validationSize.HasValue)
+                setting.ValidationSize = validationSize.Value;
+
+            if (testSize.HasValue)
+                setting.TestSize = testSize.Value;
+
+            return await loader.LoadAsync(setting);
         }
 
         public async Task<Datasets<MnistDataSet>> LoadAsync(ModelLoadSetting setting)