data_collator.rst

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Data Collator
-----------------------------------------------------------------------------------------------------------------------

Data collators are objects that will form a batch by using a list of dataset elements as input. These elements are of
the same type as the elements of :obj:`train_dataset` or :obj:`eval_dataset`.

To be able to build batches, data collators may apply some processing (like padding). Some of them (like
:class:`~transformers.DataCollatorForLanguageModeling`) also apply some random data augmentation (like random masking)
on the formed batch.

Examples of use can be found in the :doc:`example scripts <../examples>` or :doc:`example notebooks <../notebooks>`.


Default data collator
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autofunction:: transformers.data.data_collator.default_data_collator


DefaultDataCollator
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autoclass:: transformers.data.data_collator.DefaultDataCollator
    :members:


DataCollatorWithPadding
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autoclass:: transformers.data.data_collator.DataCollatorWithPadding
    :members:


DataCollatorForTokenClassification
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autoclass:: transformers.data.data_collator.DataCollatorForTokenClassification
    :members:


DataCollatorForSeq2Seq
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autoclass:: transformers.data.data_collator.DataCollatorForSeq2Seq
    :members:


DataCollatorForLanguageModeling
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autoclass:: transformers.data.data_collator.DataCollatorForLanguageModeling
    :members: numpy_mask_tokens, tf_mask_tokens, torch_mask_tokens


DataCollatorForWholeWordMask
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autoclass:: transformers.data.data_collator.DataCollatorForWholeWordMask
    :members: numpy_mask_tokens, tf_mask_tokens, torch_mask_tokens


DataCollatorForPermutationLanguageModeling
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. autoclass:: transformers.data.data_collator.DataCollatorForPermutationLanguageModeling
    :members: numpy_mask_tokens, tf_mask_tokens, torch_mask_tokens