support-fast-tokenizer (#6)

- feat: support fast tokenizer (9b5c14890f1788f110229da96fbe6f60ac25cd69)
- refactor: batch encoding (72221a70b0f9c93095e18d4b2321d00c2439c038)

tokenizer.py

@@ -1,89 +1,88 @@
 import torch
 import numpy as np
-from transformers import RobertaTokenizer, BatchEncoding
+from transformers import RobertaTokenizer, BatchEncoding, RobertaTokenizerFast
 import warnings
 
 
-class JinaTokenizer(RobertaTokenizer):
-    def __init__(self, *args, **kwargs):
-        """
-        JinaTokenizer extends the RobertaTokenizer class to include task_type_ids in
-        the batch encoding.
-        The task_type_ids are used to pass instruction information to the model.
-        A task_type should either be an integer or a sequence of integers with the same
-        length as the batch size.
-        """
-        super().__init__(*args, **kwargs)
+def get_tokenizer(parent_class):
+    class TokenizerClass(parent_class):
+        def __init__(self, *args, **kwargs):
+            """
+            This class dynamically extends a given tokenizer class from the HF
+            Transformers library (RobertaTokenizer or RobertaTokenizerFast).
+            The task_type_ids are used to pass instruction information to the model.
+            A task_type should either be an integer or a sequence of integers with the same
+            length as the batch size.
+            """
+            super().__init__(*args, **kwargs)
 
-    def __call__(self, *args, task_type=None, **kwargs):
-        batch_encoding = super().__call__(*args, **kwargs)
-        if task_type is not None:
-            batch_encoding = BatchEncoding(
-                {
-                    'task_type_ids': self._get_task_type_ids(batch_encoding, task_type),
-                    **batch_encoding,
-                },
-                tensor_type=kwargs.get('return_tensors'),
-            )
-        return batch_encoding
+        def __call__(self, *args, task_type=None, **kwargs):
+            batch_encoding = super().__call__(*args, **kwargs)
+            if task_type is not None:
+                batch_encoding = self._add_task_type_ids(batch_encoding, task_type, kwargs.get('return_tensors'))
+            return batch_encoding
 
-    def _batch_encode_plus(self, *args, task_type=None, **kwargs):
-        batch_encoding = super()._batch_encode_plus(*args, **kwargs)
-        if task_type is not None:
-            batch_encoding = BatchEncoding(
-                {
-                    'task_type_ids': self._get_task_type_ids(batch_encoding, task_type),
-                    **batch_encoding,
-                },
-                tensor_type=kwargs.get('return_tensors'),
-            )
-        return batch_encoding
+        def _batch_encode_plus(self, *args, task_type=None, **kwargs):
+            batch_encoding = super()._batch_encode_plus(*args, **kwargs)
+            if task_type is not None:
+                batch_encoding = self._add_task_type_ids(batch_encoding, task_type, kwargs.get('return_tensors'))
+            return batch_encoding
+
+        def _encode_plus(self, *args, task_type=None, **kwargs):
+            batch_encoding = super()._encode_plus(*args, **kwargs)
+            if task_type is not None:
+                batch_encoding = self._add_task_type_ids(batch_encoding, task_type, kwargs.get('return_tensors'))
+            return batch_encoding
 
-    def _encode_plus(self, *args, task_type=None, **kwargs):
-        batch_encoding = super()._encode_plus(*args, **kwargs)
-        if task_type is not None:
-            batch_encoding = BatchEncoding(
+        @classmethod
+        def _add_task_type_ids(cls, batch_encoding, task_type, tensor_type):
+            return BatchEncoding(
                 {
-                    'task_type_ids': self._get_task_type_ids(batch_encoding, task_type),
+                    'task_type_ids': cls._get_task_type_ids(batch_encoding, task_type),
                     **batch_encoding,
                 },
-                tensor_type=kwargs.get('return_tensors'),
+                tensor_type=tensor_type,
             )
-        return batch_encoding
 
-    @staticmethod
-    def _get_task_type_ids(batch_encoding: BatchEncoding, task_type):
+        @staticmethod
+        def _get_task_type_ids(batch_encoding: BatchEncoding, task_type):
 
-        def apply_task_type(m, x):
-            x = torch.tensor(x)
-            assert (
-                len(x.shape) == 0 or x.shape[0] == m.shape[0]
-            ), 'The shape of task_type does not match the size of the batch.'
-            return m * x if len(x.shape) == 0 else m * x[:, None]
+            def apply_task_type(m, x):
+                x = torch.tensor(x)
+                assert (
+                        len(x.shape) == 0 or x.shape[0] == m.shape[0]
+                ), 'The shape of task_type does not match the size of the batch.'
+                return m * x if len(x.shape) == 0 else m * x[:, None]
 
-        if isinstance(batch_encoding['input_ids'], torch.Tensor):
-            shape = batch_encoding['input_ids'].shape
-            return apply_task_type(torch.ones(shape, dtype=torch.long), task_type)
-        else:
-            try:
-                shape = torch.tensor(batch_encoding['input_ids']).shape
-            except:
-                raise ValueError(
-                    "Unable to create tensor, you should probably "
-                    "activate truncation and/or padding with "
-                    "'padding=True' 'truncation=True' to have batched "
-                    "tensors with the same length."
-                )
-            if isinstance(batch_encoding['input_ids'], list):
-                return (
-                    apply_task_type(torch.ones(shape, dtype=torch.long), task_type)
-                ).tolist()
-            elif isinstance(batch_encoding['input_ids'], np.array):
-                return (
-                    apply_task_type(torch.ones(shape, dtype=torch.long), task_type)
-                ).numpy()
-            else:
-                warnings.warn(
-                    'input_ids is not a torch tensor, numpy array, or list. Returning torch tensor'
-                )
+            if isinstance(batch_encoding['input_ids'], torch.Tensor):
+                shape = batch_encoding['input_ids'].shape
                 return apply_task_type(torch.ones(shape, dtype=torch.long), task_type)
+            else:
+                try:
+                    shape = torch.tensor(batch_encoding['input_ids']).shape
+                except:
+                    raise ValueError(
+                        "Unable to create tensor, you should probably "
+                        "activate truncation and/or padding with "
+                        "'padding=True' 'truncation=True' to have batched "
+                        "tensors with the same length."
+                    )
+                if isinstance(batch_encoding['input_ids'], list):
+                    return (
+                        apply_task_type(torch.ones(shape, dtype=torch.long), task_type)
+                    ).tolist()
+                elif isinstance(batch_encoding['input_ids'], np.array):
+                    return (
+                        apply_task_type(torch.ones(shape, dtype=torch.long), task_type)
+                    ).numpy()
+                else:
+                    warnings.warn(
+                        'input_ids is not a torch tensor, numpy array, or list. Returning torch tensor'
+                    )
+                    return apply_task_type(torch.ones(shape, dtype=torch.long), task_type)
+
+    return TokenizerClass
+
+
+JinaTokenizer = get_tokenizer(RobertaTokenizer)
+JinaTokenizerFast = get_tokenizer(RobertaTokenizerFast)