Appendix

This appendix contains the supplementary material for the main text. In Appendix B, we provide details of the derivation of the implicit gradients in Eqs. We first establish here this result. This negative result illustrates the need for alternative estimators. In Appendix A.2.3, we analyze the behavior of Lemma 1 Alternatively, we can follow the approach described in Section 4.2 to estimate both From Eq. (10), we follow the same derivation as Eq.