Opennmt-py: RuntimeError: Length of all samples has to be greater than 0 in validation set

[lizamiller]

Loading dataset from dataset/data.train.0.pt, number of examples: 93871
the process fails once i get to
[2019-03-05 12:34:01,506 INFO] Loading dataset from dataset/data.valid.0.pt, number of examples: 20000
and this is the error i get

Traceback (most recent call last):
File "train.py", line 109, in
main(opt)
File "train.py", line 39, in main
single_main(opt, 0)
File "/usr/local/lib/python3.5/dist-packages/OpenNMT2-py/OpenNMT-py/onmt/train_single.py", line 116, in main
valid_steps=opt.valid_steps)
File "/usr/local/lib/python3.5/dist-packages/OpenNMT2-py/OpenNMT-py/onmt/trainer.py", line 224, in train
valid_iter, moving_average=self.moving_average)
File "/usr/local/lib/python3.5/dist-packages/OpenNMT2-py/OpenNMT-py/onmt/trainer.py", line 274, in validate
outputs, attns = valid_model(src, tgt, src_lengths)
File "/usr/local/lib/python3.5/dist-packages/torch/nn/modules/module.py", line 489, in __call__
result = self.forward(input, *kwargs)
File "/usr/local/lib/python3.5/dist-packages/OpenNMT2-py/OpenNMT-py/onmt/models/model.py", line 42, in forward
enc_state, memory_bank, lengths = self.encoder(src, lengths)
File "/usr/local/lib/python3.5/dist-packages/torch/nn/modules/module.py", line 489, in __call__
result = self.forward(input, *kwargs)
File "/usr/local/lib/python3.5/dist-packages/OpenNMT2-py/OpenNMT-py/onmt/encoders/rnn_encoder.py", line 74, in forward
packed_emb = pack(emb, lengths_list)
File "/usr/local/lib/python3.5/dist-packages/torch/nn/utils/rnn.py", line 148, in pack_padded_sequence
return PackedSequence(torch._C._VariableFunctions._pack_padded_sequence(input, lengths, batch_first))
RuntimeError: Length of all samples has to be greater than 0, but found an element in 'lengths' that is <= 0

should i define somewhere validation size? as it is much smaller than the regular size

[lizamiller]

I am using the last OpenNMT-py (git clomed today)
the process fails once it gets to validation
any way to define validation size without running into the error
thanks

[vince62s]

you must have an empty line in the valid set.

[lizamiller]

I didn't find an empty line but i had /p that must have caused the error.
Thanks