7th informal meeting of Big Data @ LIP

Friday 6 Jul 2018, 11:30 → 12:50 Portugal

Zoom video-conference only

The meeting will start at 11h30 PT (GTM+0) time. We will use ZOOM for the vidyoconference:

https://videoconf-colibri.zoom.us/j/257850266

ZOOM works on most of the common OS, including mobile devices, and should be fairly straightforward to use.

Just connect to the above link (or use the meeting code - 257850266 - directly in the app) and follow the instructions. Further information on ZOOM can be found in: https://support.zoom.us/hc/en-us

 

Supported by project BigDataHEP, PTDC/FIS-PAR/29147/2017, PTDC/FIS-PAR/29147/2017, POCI/01-0145-FEDER-029147 (FCT, Portugal 2020, Compete 2020, Lisboa 2020, Norte 2020, UE, FEDER)

minutes

1 Introduction and general discussion

Please bring up any relevant points you might have

Speakers: Guilherme Milhano (LIP), Nuno Castro (LIP, DF/ECUM)

2 Journal Club: tuning of hyperparameters in neural networks

discussion of https://arxiv.org/abs/1803.09820

A disciplined approach to neural network hyper-parameters: Part 1 -- learning rate, batch size, momentum, and weight decay

by Leslie N. Smith

Abstract:
Although deep learning has produced dazzling successes for applications of image, speech, and video processing in the past few years, most trainings are with suboptimal hyper-parameters, requiring unnecessarily long training times. Setting the hyper-parameters remains a black art that requires years of experience to acquire. This report proposes several efficient ways to set the hyper-parameters that significantly reduce training time and improves performance. Specifically, this report shows how to examine the training validation/test loss function for subtle clues of underfitting and overfitting and suggests guidelines for moving toward the optimal balance point. Then it discusses how to increase/decrease the learning rate/momentum to speed up training. Our experiments show that it is crucial to balance every manner of regularization for each dataset and architecture. Weight decay is used as a sample regularizer to show how its optimal value is tightly coupled with the learning rates and momentums. Files to help replicate the results reported here are available.

Speaker: Giles Strong (LIP)

Binder

Repository

Docker instructions:

docker pull gilesstrong/smith_hyperparams1_demo

docker run -d -p 8888:8888 --name=smith gilesstrong/smith_hyperparams1_demo

docker exec smith jupyter notebook list