# Scripts usage

By default, OpenNMT's scripts can only be called from the root of OpenNMT's directory. If calling the scripts from any directory is more convenient to you, you need to extend the LUA_PATH:

export LUA_PATH="$LUA_PATH;/path/to/OpenNMT/?.lua"  ## Configuration files¶ You can pass options using a configuration file. The file has a simple key-value syntax with one option = value per line. Here is an example: $ cat generic.txt
rnn_size = 600
layers = 4
brnn = true
save_model = generic


It handles empty lines and ignores lines prefixed with #.

You can then pass this file along other options on the command line:

th train.lua -config generic.txt -data data/demo-train.t7 -gpuid 1


If an option appears both in the file and on the command line, the file takes priority.

## Boolean options¶

Boolean options can be used without argument. In this case, their presence on the command line negates their default value. For example the option -brnn enables bidirectional encoder when added to the command line.

They optionally accept an argument to make it more practical in scripts:

• 0 or false
• 1 or true

## Multiple arguments¶

Some options can take multiple arguments (<table> argument type in the option listings). You can either space-separate (value1 value2 value3) or comma-separate (value1,value2,value3) the values.