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finetune README improved
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Scripts for fine-tuning transformer models using some small in-domain data.
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* NOTE: this only works for SentencePiece models
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* NOTE: this only works for bilingual SentencePiece models
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## Requirements
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* marian-nmt
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* SentencePiece
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* Moses pre-processing scripts
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* OpusTools-perl (for extracting text from TMX)
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## Basic use:
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Make a fine-tune data set from newstest data (as part of the eval data in this package), for example for English-German:
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```
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make SRC=en TRG=de news-tune-data
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make SRC=en TRG=de all
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```
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Fine-tune with data from a given TMX file (in the direction of sorted language IDs taken from the TMX file):
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```
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make TMXFILE=file.tmx tmx-tune
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```
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Fine-tune with data from a given TMX file in reverse direction:
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```
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make TMXFILE=file.tmx REVERSE=1 tmx-tune
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```
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## Output
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The fine-tuned models are in subdirectories of the language pair and model name, for example
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```
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en-de/news/model
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```
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Test scores using the baseline and the fine-tuned models are in
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```
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en-de/news/test/*.eval
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```
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## Step-wise procedure
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The whole procedure consists of several steps that can be done in isolation:
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```
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# make data .............. pre-process train/dev data
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# make tune .............. fine-tune model
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# make translate ......... translate test set with fine-tuned model
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# make translate-baseline translate test set with baseline model
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# make eval .............. evaluate test set translation (fine-tuned)
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# make eval-baseline ..... evaluate test set translation (baseline)
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# make compare ........... put together source, reference translation and system output
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# make compare-baseline .. same as compare but with baseline translation
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```
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## TODO
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* download base models from ObjectStorage
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* make it work with multilingual models (need to adjust preprocess-scripts for those models)
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