lstm.py RuntimeWarning: overflow encountered

[rnsrk]

While using ocropus.rpred, the error /usr/local/lib/python2.7/dist-packages/ocrolib/lstm.py:383: RuntimeWarning: overflow encountered in exp return 1.0/(1.0+exp(-x)) appears.

Current Behavior

Errors appears while error computing process described in #243
The lines are recognised and saved as expected, but randomly the error above occurs, looks like:

INFO: training/zedler_0013_01002c.bin.png:9. Bernardinus gidius Recchi, An. 1711.
INFO: training/zedler_0013_01002e.bin.png:Aquapendente (Hieronjmus Fabricius ab) siehe
INFO: training/zedler_0013_010030.bin.png:Aquapendente (Micolaut ab) ein Jtaliäner, aus
/usr/local/lib/python2.7/dist-packages/ocrolib/lstm.py:383: RuntimeWarning: overflow encountered in exp
return 1.0/(1.0+exp(-x))
INFO: training/zedler_0013_010031.bin.png:dem Orden S. Augustini, schrieb de Raptiso: a Pec-
INFO: training/zedler_0013_010032.bin.png:e o trigiu ali: de Pr tenti : de s, infero,
/usr/local/lib/python2.7/dist-packages/ocrolib/lstm.py:383: RuntimeWarning: overflow encountered in exp
return 1.0/(1.0+exp(-x))
INFO: training/zedler_0013_010035.bin.png:pie auh Conciones siue Serones. Hemdreich.
INFO: training/zedler_0013_010034.bin.png:mgratitudine: de Festis Sasktorum: Kuadragesiuale
INFO: training/zedler_0013_010033.bin.png:prg atorio: de Merc atura: de ortilegss: de vitamncka
INFO: training/zedler_0013_010036.bin.png:Aquapu lco, Lat. Portus aquæ pulchræ, eine

Your Environment

• Python version: Python 2.7.13

• Git revision of ocropy:
  downloaded 01.01.2017
• Operating System and version:
  Ubuntu 17.04 x64

[zuphilip]

We have seen similar errors before and I think #201 will fix this. You can test these changes locally.

[rnsrk]

66c6007 worked fine, no runtime warnings anymore

[kba]

Fix was merged in #201