MnistHDFSDataSetIterator hdfs_fetcher = new MnistHDFSDataSetIterator( batchSize, 1, txt_reader );
DataSet hdfs_recordBatch = hdfs_fetcher.next();
Matrix hdfs_input = hdfs_recordBatch.getFirst();
Matrix hdfs_labels = hdfs_recordBatch.getSecond();
//ModelTester.evaluateModel( recordBatch.getFirst(), recordBatch.getSecond(), dbn);
int[] hiddenLayerSizes = new int[] {2,2,2};