Resolve the comment.

src/TensorFlowNET.Keras/Engine/DataAdapters/TensorLikeDataAdapter.cs

@@ -21,7 +21,7 @@ namespace Tensorflow.Keras.Engine.DataAdapters
         {
             this.args = args;
             _process_tensorlike();
-            num_samples = (int)args.X[0].shape[0];
+            num_samples = (int)args.X.shape[0];
             var batch_size = args.BatchSize == -1 ? 32 : args.BatchSize;
             _batch_size = batch_size;
             _size = Convert.ToInt32(Math.Ceiling(num_samples / (batch_size + 0.0f)));