---------------------------------------------------------------------------- To convert Maxent 1.0 models to a new format: java opennlp.maxent.io.OldFormatGISModelReader old_model_prefix new_model_name The new model name is case sensitive, so if you put something like "mymodel.bin.gz" it will save it as a gzipped binary file, whereas "mymodel.txt" will save it as a plain text file that you can inspect more easily (but of course take more disk space). An an example, I needed to convert the Maxent 1.0 model for part of speech tagging to a new single file format. The model was broken into two pieces, EnglishPOS.mei.gz and EnglishPOS.mep.gz. I wanted to create a new file that was gzipped and binary, so this was the form of the command: java opennlp.maxent.io.OldFormatGISModelReader EnglishPOS EnglishPOS.bin.gz ---------------------------------------------------------------------------- To convert between different formats of the new style: java opennlp.maxent.io.SuffixSensitiveGISModelReader old_model_name new_model_name For example, to convert a model called "model.bin.gz" (which is thus saved in gzipped binary format) to one in (unzipped) text format: java opennlp.maxent.io.SuffixSensitiveGISModelReader model.bin.gz model.txt This particular example would of course be useful when you want to create models which take up less space (.bin.gz), but then need to inspect a few of them as plain text files.