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| .. role:: hidden | |
| :class: hidden-section | |
| .. module:: fairseq.tasks | |
| .. _Tasks: | |
| Tasks | |
| ===== | |
| Tasks store dictionaries and provide helpers for loading/iterating over | |
| Datasets, initializing the Model/Criterion and calculating the loss. | |
| Tasks can be selected via the ``--task`` command-line argument. Once selected, a | |
| task may expose additional command-line arguments for further configuration. | |
| Example usage:: | |
| # setup the task (e.g., load dictionaries) | |
| task = fairseq.tasks.setup_task(args) | |
| # build model and criterion | |
| model = task.build_model(args) | |
| criterion = task.build_criterion(args) | |
| # load datasets | |
| task.load_dataset('train') | |
| task.load_dataset('valid') | |
| # iterate over mini-batches of data | |
| batch_itr = task.get_batch_iterator( | |
| task.dataset('train'), max_tokens=4096, | |
| ) | |
| for batch in batch_itr: | |
| # compute the loss | |
| loss, sample_size, logging_output = task.get_loss( | |
| model, criterion, batch, | |
| ) | |
| loss.backward() | |
| Translation | |
| ----------- | |
| .. autoclass:: fairseq.tasks.translation.TranslationTask | |
| .. _language modeling: | |
| Language Modeling | |
| ----------------- | |
| .. autoclass:: fairseq.tasks.language_modeling.LanguageModelingTask | |
| Adding new tasks | |
| ---------------- | |
| .. autofunction:: fairseq.tasks.register_task | |
| .. autoclass:: fairseq.tasks.FairseqTask | |
| :members: | |
| :undoc-members: | |