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Hi,
in the Jupyter-Notebook "DMC_Capacity.ipynb" from the lecture CC_GBC, i get the folowing hint:

This use of ``*`` has resulted in matrix multiplication.
Using ``*`` for matrix multiplication has been deprecated since CVXPY 1.1.
    Use ``*`` for matrix-scalar and vector-scalar multiplication.
    Use ``@`` for matrix-matrix and matrix-vector multiplication.
    Use ``multiply`` for elementwise multiplication.

I think this commes from the following line of code:
objective = cp.Maximize(np.sum(Ptilde,axis=0)*px + cp.sum(cp.entr(P*px))/np.log(2.0))

and needs to be changed to:
objective = cp.Maximize(np.sum(Ptilde,axis=0)@px + cp.sum(cp.entr(P@px))/np.log(2.0))

Best regards
Johny Volz