Utilize CVXPY to Difference of Concave procedure

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I try to implement the Difference of Concave procedure to solve the nonconvex Shannon rate formula, but when using CVXPY, it always result in ill-posed status, what is wrong? Can someone indicate me? I am new to convex optimization. Thanks a lot.

This forum is for CVX, which runs under MATLAB, nor CVXPY

https://www.cvxpy.org/faq/index.html#where-can-i-get-help-with-cvxpy

Thank you very much.