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Ran Manor
Attends Ben-Gurion University of the Negev
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Ran Manor

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The Choose Your Own Premium Android Giveaway - Win a Galaxy S6 Edge, an LG G4, or the Huawei P8 - The Choice is Yours to Make!
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Hi,
I'm looking for a public benchmark data set to test algorithms for entities' relations extractions. 
The only thing I found is this:
http://www.itl.nist.gov/iad/mig/tests/ace/2008/
But I couldn't find where I can download it.
Does anyone know another data set which can be downloaded for free?
Thanks.
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Ran Manor

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tl;dr - how to force network learn "low-level" features?

I'm working on a convolutional neural network on some biological data. The data has some variance between subjects, so up until now I trained a network per subject.
Now I want to try a network on multiple subjects, assuming that the network will learn some common features between the subjects and so the extra data will improve my classification performance.
Unfortunately, that doesn't happen.
The performance I get from multiple subjects is very low.
My net is deep, 3 convolutional layer, 2 fully connected layers.
Is there any trick to force the net to learn low level features better?
Thanks.
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Siavash Sakhavi's profile photoRan Manor's profile photoPaco Zamora Martínez's profile photo
21 comments
 
+Ran Manor thinking about the ability of the network to learn fft transformation, I have the intuition a layer with sin activation function would be necessary imho. I feel that logistic, relu, tanh, etc cannot learn fft filters. But I never tried this idea ;-)
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Ran Manor

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*The function of stride in convolutional neural networks"

I often see in implementations of CNNs that there is a small amount of stride in the convolution layer and in the pooling layer. 
I understand that the stride helps to reduce the dimension and it skips nearby samples which are usually highly correlated.
My question is, why is there stride in both the convolution and the pooling? why not just in one of them?
Can someone give me a better intuition behind it?

Thank you.
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Ran Manor's profile photoAlexandre Dalyac's profile photo
6 comments
 
pleasure :) 
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Ran Manor

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ח"כ, סגן ראש עירייה ועובד בכיר בעירייה מסבירים למה פוליטיקאים חייבים לשרת קבוצות אינטרס
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Ran Manor

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I'm trying a supervised neural network on data that has two unbalanced classes, class 0 is 90% of the data and class 1 is 10%. I replicate the smaller class for training so the gradients won't go only to one direction. It works relatively fine and the network performance is almost balanced. I'm training using standard gradient descent with a fixed learning rate and my network has sigmoid units. 
I've noticed that if I start using momentum or rectified linear units (separately) then the network performance starts to skew towards class 0 (the bigger class).
This is a weird effect and I don't have a good idea on how to explain it.
Any ideas?
Thanks.
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Hou Yunqing's profile photoPeter Speckmayer's profile photoJohn Taylor's profile photoPaco Zamora Martínez's profile photo
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We have been also working with umballanced binary tasks. One possibility to improve results is to change the loss function by one which takes into account precision/recall, as the F1-score or similar loss functions. Approximations of the gradient for this kind of measures is possible, and it leads to better F1 performance in test set. In case you are interested, here are the slides of our work.

http://www.slideshare.net/franciscozamoraceu/iwann2013
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Ran Manor

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Ran Manor

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Welcome to the Sunday Giveaway, the place where we giveaway a new Android phone or tablet each and every Sunday. A big congratulations to last week’s winner of the LG G4 giveaway: Reinaldo from the United States of America. This week we are giving away a Samsung Galaxy S6! The Samsung Galaxy S6 has landed, bringing with it a much needed injection of premium materials. Trading in its typical plastic design language, the latest Galaxy ...
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Ran Manor

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Should be interesting!
 
Geoff Hinton is doing a reddit AMA on Monday:

http://redd.it/2lmo0l
I design learning algorithms for neural networks. My aim is to discover a learning procedure that is efficient at finding complex structure in...
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Ran Manor

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Easy Notifications is a new notification app with the missing toggles for a...
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PhD Student
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drums, guitar and machine learning.
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PhD student with interest in machine learning and deep learning.
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  • Ben-Gurion University of the Negev
    Electrical & Computer Engineering, 2006 - present
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