040000 tree ff2af8e4ae366c03727e89533e6b20d5d2233e7d	artifact-tests
040000 tree 9b3cb25a867471134ea55851485e17db4ea1a944	graphx
040000 tree 08f56637ff812cd46c5affebd37cfee0101d40e3	mllib
040000 tree 7540717860b10a00c03f9990c953fd3d64945acd	streaming