DeepChem

You can now install DeepChem with 

import os

os.environ["TF_USE_LEGACY_KERAS"] = "True"

!pip install deepchem

import deepchem

Note that DeepChem includes RDKit, so you don't need to install RDKit separately.

And define your model like this:

model = dc.models.GraphConvModel(len(delaney_tasks), batch_size = batch_size, mode = 'regression', batch_normalize = False)

The code I copy has changed significantly, so it is better just to write the final code into your notebook.