TF Detect is a part of “TensorFlow Android Camera Demo”: https://github.com/tensorflow/tensorflow/tree/master/tensorflow/examples/android
TF Detect – Demonstrates a model based on Scalable Object Detection using Deep Neural Networks (https://arxiv.org/abs/1312.2249) to localize and track people in the camera preview in real-time.
TF Detect source code: https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/android/src/org/tensorflow/demo/DetectorActivity.java