[Lisa_seminaires] Tea talk Wednesday 2nd April @13:00 AA3195 by Chris Pal

Razvan Pascanu r.pascanu at gmail.com
Mer 2 Avr 08:44:55 EDT 2014


Remainder about today's tea talk.

-R


On Sat, Mar 29, 2014 at 9:34 PM, Razvan Pascanu <r.pascanu at gmail.com> wrote:

> Hi all,
>
>  This Wednesday, same place AA3195, same time 13:00, we have the following
> tea talk scheduled:
>
> Talk by : Christopher Pal
>
> Title: A New Smooth Approximation for Learning with the Zero One Loss with
> a Probabilistic Interpretation
>
> We examine a new form of smooth approximation to the zero one loss which
> can be viewed as learning using a reformulation of the classical functional
> form of logistic regression. Our approach is based on using the posterior
> mean of a novel generalized Beta-Bernoulli formulation. This leads to a
> generalized logistic function that approximates the zero one loss, but
> retains a probabilistic formulation. We show how the underlying functional
> form has a number of interesting properties. The approach is also easily
> generalized to kernel logistic regression and beyond. We present
> experiments in which we learn such models using a combination of gradient
> descent and coordinate descent using localized grid search so as to escape
> from local minima. Our experiments are indicating that that this
> formulation can improve upon the performance of canonical models such as
> classical logistic regression and support vector machines and is more
> robust to outliers. This work is with Md. Kamrul Hasan and he may present
> the second half of the talk.
>
>
> I hope to see many of you there,
> Best,
> Razvan
>
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