You are all cordially invited to the AMLab seminar on **Thursday 21st November **at **14:00** in **C3.163**, where **Herke van Hoof **will give a talk titled **“Gradient estimation algorithms”**. There are the usual drinks and snacks!

**Abstract: **In many cases, we cannot calculate exact gradients. This is the case if we cannot evaluate how well the model was expected to have done for different parameter values, for example if the model generates a sequence of stochastic decisions. Thus, many gradient estimators have been developed, from classical techniques from reinforcement learning to modern techniques such as the relax estimator. In e.g. meta-learning second derivative estimators have also been proposed. In this talk, I will attempt to give an overview of the properties of these techniques.