add more token encoing types

llmfoundry/data/text_data.py

@@ -106,6 +106,7 @@ def __init__(
         self,
         tokenizer: PreTrainedTokenizerBase,
         max_seq_len: int,
+        token_encoding_type: str = 'int32',
         streams: Optional[Sequence[Stream]] = None,
         remote: Optional[str] = None,
         local: Optional[str] = None,
@@ -137,6 +138,12 @@ def __init__(
                 f'StreamingTextDataset() got an unexpected keyword argument: {kwargs}',
             )
 
+        if token_encoding_type not in ['int16', 'int32', 'int64']:
+            raise ValueError(
+                f'The token_encoding_type must be one of [\'int16\', \'int32\', \'int64\'], but got {token_encoding_type}',
+            )
+        self.token_encoding_type = token_encoding_type
+
         if local is not None and (remote is None or (local == remote)):
             if os.path.isdir(local):
                 contents = set(os.listdir(local))
@@ -198,8 +205,9 @@ def _read_binary_tokenized_sample(
         sample: Dict[str, Any],
     ) -> torch.Tensor:
         return torch.from_numpy(
-            np.frombuffer(sample['tokens'],
-                          dtype=np.int64)[:self.max_seq_len].copy(),
+            np.frombuffer(
+                sample['tokens'], dtype=getattr(np, self.token_encoding_type)
+            )[:self.max_seq_len].copy(),
         )
 
     # How to process a sample