ImportError: cannot import name 'PetroskiSuchModel'

the following configuration is deepchem=2.4.0 rc ,tensorfow :2.3.0 python :3.6.5,rkdit:2020.09.1.0,why ?

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The PetroskiSuchModel wasn’t well supported or implemented so we made a call to move it into contrib ( We’d be open to adding it back in but we’d need someone to take on the project of cleaning it up and documenting it. If you’re interested in helping, please let us know!

Thank you for your reply.Now I am studying the deepchem,if I know it clearly,I can try it.