To use Ferret:
Collect some logs using the logger. These will write to a file called ALoggerLog.txt on the device in the /data/data/com.google.research.ic.alogger directory.
Place log files (as many as you like) in the directory ferret/analyzer/logs.
Hook up an Android device with the logger installed to your desktop/laptop.
Run AppMain in the ferret-analyzer project in Eclipse (other IDEs not supported yet).
Point your browser to ferret/analyzer/webui/index.html.
Click "record" and enter an interaction sequence, then press "search."
Enjoy the results!
PLEASE NOTE: This is not an official Google product (experimental or otherwise), it is just code that happens to be owned by Google.