Possible bug in ocropus-rtrain

[adnanulhasan]

Possible bug in ocropus-rtrain

[tmbdev]

I'm adding a check for last_save being None. I think generally, if you get a floating point error during the first round, the learning rate is so wrong that restarting isn't very useful.

[kba]

Was that check implemented? I cannot find it in the commit history.

[Luonic]

Looks like i having same problem, Mac OS X El Capitan

# oops, got FloatingPointError overflow encountered in exp
Traceback (most recent call last):
  File "/usr/local/bin/ocropus-rtrain", line 286, in <module>
    pcs = network.trainSequence(line,cs,update=do_update,key=fname)
  File "/usr/local/lib/python2.7/site-packages/ocrolib/lstm.py", line 890, in trainSequence
    self.outputs = array(self.lstm.forward(xs))
  File "/usr/local/lib/python2.7/site-packages/ocrolib/lstm.py", line 605, in forward
    xs = net.forward(xs)
  File "/usr/local/lib/python2.7/site-packages/ocrolib/lstm.py", line 661, in forward
    outputs = [net.forward(xs) for net in self.nets]
  File "/usr/local/lib/python2.7/site-packages/ocrolib/lstm.py", line 640, in forward
    return self.net.forward(xs[::-1])[::-1]
  File "/usr/local/lib/python2.7/site-packages/ocrolib/lstm.py", line 559, in forward
    self.WIP,self.WFP,self.WOP)
  File "/usr/local/lib/python2.7/site-packages/ocrolib/lstm.py", line 428, in forward_py
    go[t] = ffunc(gox[t])
  File "/usr/local/lib/python2.7/site-packages/ocrolib/lstm.py", line 376, in funk
    return 1.0/(1.0+exp(-x))
FloatingPointError: overflow encountered in exp
Traceback (most recent call last):
  File "/usr/local/bin/ocropus-rtrain", line 290, in <module>
    network = load_lstm(last_save)
  File "/usr/local/bin/ocropus-rtrain", line 176, in load_lstm
    network = ocrolib.load_object(last_save)
  File "/usr/local/lib/python2.7/site-packages/ocrolib/common.py", line 503, in load_object
    fname = ocropus_find_file(name)
  File "/usr/local/lib/python2.7/site-packages/ocrolib/common.py", line 682, in ocropus_find_file
    if os.path.exists(name):
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/genericpath.py", line 26, in exists
    os.stat(path)
TypeError: coercing to Unicode: need string or buffer, NoneType found

[kba]

@Luonic Can you create a new issue, ideally with the data to reproduce the problem? This seems a fixable bug.