you need to get below files first.
- model: https://github.com/google/mediapipe/blob/master/mediapipe/models/face_detection_front.tflite
- flatc: https://github.com/tensorflow/tensorflow/blob/v1.14.0/tensorflow/lite/tools/visualize.py#L38
- shema: https://github.com/tensorflow/tensorflow/blob/v1.14.0/tensorflow/lite/tools/visualize.py#L37