Problem performing inference using English-Vietnamese model

[FallakAsad]

I am trying to perform inference using trained English-Vietnamese model given at NMT documentation at http://download.tensorflow.org/models/nmt/envi_model_1.zip. I am using following command to perform inference using checkpoint provided in the link.

python3 -m nmt.nmt \
    --src=en --tgt=vi \
    --vocab_prefix=nmt/iwslt15/vocab \
    --out_dir=nmt/envi_model_1/ \
    --ckpt=nmt/envi_model_1/translate.ckpt.data-00000-of-00001 \
    --inference_input_file=nmt/iwslt15/tst2012.en \
    --inference_output_file=nmt/output

But I see following error: tensorflow.python.framework.errors_impl.DataLossError: Unable to open table file nmt/envi_model_1/translate.ckpt.data-00000-of-00001: Data loss: not an sstable (bad magic number): perhaps your file is in a different file format and you need to use a different restore operator?

• The data I am using is downloaded using the script https://github.com/tensorflow/nmt/blob/master/nmt/scripts/download_iwslt15.sh (Provided in Tensorflow NMT documentation). All data files are located under nmt/iwslt15 and this folder have following list of files: train.en tst2012.en tst2013.en vocab.en train.vi tst2012.vi tst2013.vi vocab.vi
• Checkpoint is downloaded from link http://download.tensorflow.org/models/nmt/envi_model_1.zip (Provided in Tensorflow NMT documentation)
• The tensorflow version is '1.11.0-dev20180827' (Installed using "pip3 install tf-nightly")
• Python version is 3.5.2

Can you help me out why the command is not working? Am I doing something wrong?

Thanks in advance.

[FallakAsad]

I am closing this issue as there was problem with my command and that was that the --ckpt option must point to the prefix of the model instead of the checkpoint file as "--ckpt=nmt/envi_model_1/translate.ckpt" instead of "--ckpt=nmt/envi_model_1/translate.ckpt.data-00000-of-00001."