Fix detection notebook issue on docker (#335)

Author: sspintel

examples/notebooks/OpenVINO_TensorFlow_object_detection_example.ipynb

@@ -193,11 +193,31 @@
     "    path = \"examples\"\n",
     "else:\n",
     "    path = \"{0}/openvino_tensorflow/examples/\".format(OVTF_DIR)\n",
-    "%cd {path}\n",
-    "!python3 -m pip install virtualenv\n",
-    "!virtualenv env\n",
-    "!source env/bin/activate && chmod +x convert_yolov4.sh && bash convert_yolov4.sh && deactivate\n",
-    "# Once the model conversion is completed; move back to outside of examples directory\n",
+    "%cd {path}"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%%bash\n",
+    "# Download and convert the model (Might take a while)\n",
+    "python3 -m pip install --force-reinstall virtualenv\n",
+    "# This path needs to be appended while running on the docker container\n",
+    "export PATH=$PATH:/home/openvino/.local/bin\n",
+    "virtualenv env\n",
+    "source env/bin/activate && chmod +x convert_yolov4.sh && bash convert_yolov4.sh && deactivate"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Once the model conversion is completed; move back outside of the examples directory\n",
     "%cd ../"
    ]
   },