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 For tflite models, use the [web-based visualization tool](https://lutzroeder.github.io/netron/) to
 inspect the file. The tool supports drag and drop or file GUI.
 
+## Test data
+
+Test data for sample model inputs are in the "test_data" directory. Currently, only test data for the Human Presence Sensor model are included.
+
+### hps_0-6.jpg
+
+Test image files for Human Presence Sensor model, from ChromeOS codebase.
+
 ## Model executables
 
 For each model, the corresponding model executable under `iree_exec` can be
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