fixed testing notebook

Author: alex-yang-upenn

vitis_accelerator_test/9_Vitis_Accel.ipynb

@@ -381,7 +381,7 @@
    "source": [
     "from hls4ml.backends.vitis_accelerator.vitis_accelerator_backend import VitisAcceleratorBackend\n",
     "\n",
-    "VitisAcceleratorBackend._numpy_to_dat(hls_model.config.backend, hls_model, x_test) # Manually copy tb_input_features.dat after executing this"
+    "VitisAcceleratorBackend.numpy_to_dat(hls_model.config.backend, hls_model, x_test) # Manually copy tb_input_features.dat after executing this"
    ]
   },
   {
@@ -390,7 +390,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "y_hls_hw = VitisAcceleratorBackend._dat_to_numpy(hls_model.config.backend, hls_model) # Manually copy hw_results.dat before executing this"
+    "y_hls_hw = VitisAcceleratorBackend.dat_to_numpy(hls_model.config.backend, hls_model) # Manually copy hw_results.dat before executing this"
    ]
   },
   {