The AI/ML Applications on Gadi - Astronomy course takes recently published results from the Hydrogen Epoch of Reionizaton Array collaboration as a demonstration and uses Tensorflow/Keras to build a simple emulator for the 21cm FAST simulation. We also show how to write a simple Bayesian framework using EMCEE to perform inference with the emulator. At the end, you will take home 2 Jupyter notebooks which can be easily adapted for your own science projects.