Empty reply from opennmt server -using docker containers


I could download and run the Opennmt server on ubuntu. When I run the following the curl command :
curl -v -H “Content-Type: application/json” -X POST -d ‘[{ “src” : “Hello World” }]’ http://IP_address:7784/translator/translate

I get the following response

The image downloaded from docker hub has been model using 13 epoch stages.

What am I missing here ?

Thank You,


How did you run the translation server? If using Docker, did you expose the port?


i ran the docker server using the following command:
sudo docker run -td -p 7784:7784 opennmt/opennmt



I am getting a empty response from the server again:

The container is running :

There is empty reply from server when models are requested:

I am really unable to make out as to why there is empty response from server

Please assist me to resolve this issue.

Thank You,

You are just running the Docker image not the translation server. I already posted the command line to run the server script and display its options:

docker run --entrypoint th opennmt/opennmt tools/rest_translation_server.lua -h

And here is a high level documentation of the REST:


And finally some Docker-specific considerations:

  • you should expose the port when running the image
  • you should mount any files that is required by the translation

There is all the required information here, please try to work it out.


th tools/rest_translation_server.lua -model …/Recipes/baseline-1M-enfr/exp/model-baseline-1M-enfr_epoch13_3.44.t7 -gpuid 1 -host … -port -case_feature -bpe_model …

what is th command here ?

Thank You,


I run the suggested above command which resulted in the below error:

Please assist me in resolving this error.

Thank You,


When I sent a request to the downloaded docker image using curl I get an empty response from the server. So from the link “http://opennmt.net/OpenNMT/tools/servers/” I am trying to run following commands in order to check if the curl return an response .

  1. luarocks install restserver-xavante
  2. th tools/rest_translation_server.lua -model …/Recipes/baseline-1M-enfr/exp/model-baseline-1M-enfr_epoch13_3.44.t7 -gpuid 1 -host … -port -case_feature -bpe_model …
  3. curl -v -H “Content-Type: application/json” -X POST -d ‘[{ “src” : “Hello World” }]’ http://IP_address:7784/translator/translate

I am struck in the 2nd command above Please assist with the below

I am trying to run the following command, but unable t find the value for the options:
th tools/rest_translation_server.lua -model …/Recipes/baseline-1M-enfr/exp/model-baseline-1M-enfr_epoch13_3.44.t7 -gpuid 1 -host … -port -case_feature -bpe_model

I am unable to find the model value and bpe_model value in the above command…
Could someone please assist me to find this ?

I guess I am in the correct path of running a translation server .
Please clarify if the order of commands to run the translation server is correct ?

I also assume that empty response from the translation server could be resolved by the above steps

Thank You,

Here is a full example using a pretrained model. Please run it and adapt it to your model.

Download the model:

wget https://s3.amazonaws.com/opennmt-models/wmt-ende_l2-h1024-bpe32k_release.tar.gz && tar xf wmt-ende_l2-h1024-bpe32k_release.tar.gz

Run the server:

docker run --rm -v $PWD:/data -p 7784:7784 --entrypoint th opennmt/opennmt:latest tools/rest_translation_server.lua -host -model /data/model-ende_epoch7_5.55_release.l /data/train-ende.bpe32000 -mode aggressive -segment_case -joiner_annotate

Send a request:

curl -v -H "Content-Type: application/json" -X POST -d '[{"src": "Hello World!"}]'

If you are still unable to setup a simple server, consider posting to #marketplace and pay people to assist you.