I use openNMT-py with colab .
I trained model with a BPE and transformer on dataset fr2en contains 200k sentences for train, 1000 for dev and 1500 for test.
(vocab size 10000, layers 12, batch size 4096, train step 60000).
score BLEU is:
BLEU = 15.20, 41.8/20.1/10.7/5.9 (BP=1.000, ratio=1.018, hyp_len=27277, ref_len=26786).
i tried to train many times but got the same result.
Any suggestion or help.