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Add Multi-output GPs support in PyMC [WIP] #79

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This PR implements Multi-output GP classes with Hadamard product and Kronecker product. This is a work-in-progress (WIP) PR as I still need to try different APIs options for different kinds of input data.

TODOs:

  • Wrap MultiOutputMarginal class for Kronecker product
  • Add MultiOutputLatent class
  • Write tests and documentations for these functions and classes.

I will ask for reviewers a bit later when it is ready.

CC @bwengals @fonnesbeck

Thank you.

X = np.vstack(input_list)
X = np.hstack([X, I[:, None]])

return X, Y, I[:, None] # slicesdef build_XY(input_list,output_list=None,index=None):
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