fix compile error

src/TensorFlowNET.Core/Graphs/Graph.cs

@@ -145,7 +145,7 @@ namespace Tensorflow
             _create_op_helper(op, true);
 
             Console.Write($"create_op: {op_type} '{node_def.Name}'");
-            Console.Write($", inputs: {(inputs.Count == 0 ? "empty" : String.Join(",", inputs.Select(x => x.name)))}");
+            Console.Write($", inputs: {(inputs.Length == 0 ? "empty" : String.Join(",", inputs.Select(x => x.name)))}");
             Console.Write($", outputs: {(op.outputs.Length == 0 ? "empty" : String.Join(",", op.outputs.Select(x => x.name)))}");
             Console.WriteLine();