<div dir="ltr"><div class="gmail_default" style="font-size:large;color:#000000"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On 10 September 2017 at 22:03, Sebastian Raschka <span dir="ltr"><<a href="mailto:se.raschka@gmail.com" target="_blank">se.raschka@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">You could normalize the outputs (e.g., via min-max scaling). However, I think the more intuitive way would be to clip the predictions. E.g., say you are predicting house prices, it probably makes no sense to have a negative prediction, so you would clip the output at some value >0$<br>
<br></blockquote><div><br><div style="font-size:large;color:rgb(0,0,0)" class="gmail_default">By clipping you mean discarding the predictors that give values below/above the threshold? <br></div><br> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
PS: -820 and -800 sounds a bit extreme if your training data is in a -5 to -9 range. Is your training data from a different population then the one you use for testing/making predictions? Or maybe it's just an extreme case of overfitting.<br>
<br></blockquote><div><br><div style="font-size:large;color:rgb(0,0,0)" class="gmail_default">It is from the same population, but the training sets I use are very small (6-32 observations), so it must be over-fitting. We had that discussion in the past here, yet in practice I get good correlations with the experimental values using MLPRegressors.</div><br> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Best,<br>
Sebastian<br>
<div><div class="h5"><br>
<br>
> On Sep 10, 2017, at 3:13 PM, Thomas Evangelidis <<a href="mailto:tevang3@gmail.com">tevang3@gmail.com</a>> wrote:<br>
><br>
> Greetings,<br>
><br>
> Is there any way to force the MLPRegressor to make predictions in the same value range as the training data? For example, if the training data range between -5 and -9, I don't want the predictions to range between -820 and -800. In fact, some times I get anti-correlated predictions, for example between 800 and 820 and I have to change the sign in order to calculate correlations with experimental values. Is there a way to control the value range explicitly or implicitly (by post-processing the predictions)?<br>
><br>
> thanks<br>
> Thomas<br>
><br>
><br>
> --<br>
> ==============================<wbr>==============================<wbr>==========<br>
> Dr Thomas Evangelidis<br>
> Post-doctoral Researcher<br>
> CEITEC - Central European Institute of Technology<br>
> Masaryk University<br>
> Kamenice 5/A35/2S049,<br>
> 62500 Brno, Czech Republic<br>
><br>
> email: <a href="mailto:tevang@pharm.uoa.gr">tevang@pharm.uoa.gr</a><br>
> <a href="mailto:tevang3@gmail.com">tevang3@gmail.com</a><br>
><br>
> website: <a href="https://sites.google.com/site/thomasevangelidishomepage/" rel="noreferrer" target="_blank">https://sites.google.com/site/<wbr>thomasevangelidishomepage/</a><br>
><br>
><br>
</div></div>> ______________________________<wbr>_________________<br>
> scikit-learn mailing list<br>
> <a href="mailto:scikit-learn@python.org">scikit-learn@python.org</a><br>
> <a href="https://mail.python.org/mailman/listinfo/scikit-learn" rel="noreferrer" target="_blank">https://mail.python.org/<wbr>mailman/listinfo/scikit-learn</a><br>
<br>
______________________________<wbr>_________________<br>
scikit-learn mailing list<br>
<a href="mailto:scikit-learn@python.org">scikit-learn@python.org</a><br>
<a href="https://mail.python.org/mailman/listinfo/scikit-learn" rel="noreferrer" target="_blank">https://mail.python.org/<wbr>mailman/listinfo/scikit-learn</a><br>
</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div>
<p style="margin-bottom:0cm" align="LEFT"><span style="color:rgb(0,0,0)"><span style="font-family:arial,helvetica,sans-serif"><font size="2">======================================================================</font></span></span></p>
<p style="margin-bottom:0cm" align="LEFT"><span style="color:rgb(0,0,0)"><span style="font-family:arial,helvetica,sans-serif"><font size="2">Dr Thomas Evangelidis</font></span></span></p>
<p style="margin-bottom:0cm" align="LEFT"><span style="color:rgb(0,0,0)"><span style="font-family:arial,helvetica,sans-serif"><font size="2">Post-doctoral Researcher<br></font></span></span></p><span style="color:rgb(0,0,0)"><span style="font-family:arial,helvetica,sans-serif"><font size="2">CEITEC - Central European Institute of Technology<br>Masaryk University<br>Kamenice 5/A35/2S049, <br>62500 Brno, Czech Republic <br></font></span></span></div><div dir="ltr"><span style="color:rgb(0,0,0)"><br></span><p style="margin-bottom:0cm" align="LEFT"><span style="color:rgb(0,0,0)"><span style="font-family:arial,helvetica,sans-serif"><font size="2">email: <a href="mailto:tevang@pharm.uoa.gr" target="_blank">tevang@pharm.uoa.gr</a></font></span></span></p>
<p style="margin-bottom:0cm" align="LEFT"><span style="color:rgb(0,0,0)"><span style="font-family:arial,helvetica,sans-serif"><font size="2"> <a href="mailto:tevang3@gmail.com" target="_blank">tevang3@gmail.com</a></font></span></span></p>
<p style="margin-bottom:0cm" align="LEFT"><span style="color:rgb(0,0,0)"><span style="font-family:arial,helvetica,sans-serif"><font size="2"><br>website:
<a href="https://sites.google.com/site/thomasevangelidishomepage/" target="_blank">https://sites.google.com/site/thomasevangelidishomepage/</a></font></span></span></p><span style="color:rgb(0,0,0)"><br></span><p style="margin-bottom:0cm" align="LEFT">
</p>
</div></div></div></div></div></div></div></div>
</div></div>