Add default name for AdamOptimizer.

Author: Oceania2018

src/TensorFlowNET.Core/Train/tf.optimizers.cs

@@ -13,7 +13,7 @@ public static class train
             public static Optimizer GradientDescentOptimizer(float learning_rate) 
                 => new GradientDescentOptimizer(learning_rate);
 
-            public static Optimizer AdamOptimizer(float learning_rate, string name = null) 
+            public static Optimizer AdamOptimizer(float learning_rate, string name = "Adam") 
                 => new AdamOptimizer(learning_rate, name: name);
 
             public static Saver Saver(VariableV1[] var_list = null) => new Saver(var_list: var_list);

test/TensorFlowNET.Examples/TextProcess/CnnTextClassification.cs

@@ -22,7 +22,7 @@ public class CnnTextClassification : IExample
         public bool Enabled { get; set; } = true;
         public string Name => "CNN Text Classification";
         public int? DataLimit = null;
-        public bool IsImportingGraph { get; set; } = true;
+        public bool IsImportingGraph { get; set; } = false;
 
         private const string dataDir = "word_cnn";
         private string dataFileName = "dbpedia_csv.tar.gz";
@@ -304,7 +304,6 @@ private bool Train(Session sess, Graph graph)
         public bool Train()
         {
             var graph = IsImportingGraph ? ImportGraph() : BuildGraph();
-            // string json = JsonConvert.SerializeObject(graph, Formatting.Indented);
             return with(tf.Session(graph), sess => Train(sess, graph));
         }