Algorithm 1 CPPD Algorithm
1:	Initialize: θ∈ [−1, 1], στ‖K‖2 < 1, x(0), x̄(0)∈ X, y(0) ∈ Y	▹‖K‖ = σmax(K)
2:	repeat
3:	y(k+1) = proxσF(y(k) + σKx̄(k))
4:	x(k+1) = proxτG(x(k) − τKTy(k+1))
5:	x̄(k+1) = x(k+1) +θ(x(k+1) − x(k))
6:	until x(k+1), y(k+1) = x(k) y(k)	▹ stop when convergence criteria met