Improved token count

src/dynaword/process_dataset.py

@@ -17,14 +17,13 @@ logger = logging.getLogger(__name__)
 def _tokenize_function(
     examples: dict[str, Any], tokenizer: AutoTokenizer
 ) -> dict[str, Any]:
-    token_count = [
-        len(tokens)
-        for tokens in tokenizer(examples[ColumnNames.text.value], padding=False)[  # type: ignore
-            "input_ids"
-        ]
-    ]
-    examples[ColumnNames.token_count.value] = token_count
-    return examples
+    encodings = tokenizer(
+        examples["text"],
+        padding=False,
+        truncation=False,
+        return_length=True,  # much faster, avoids storing all IDs
+    )  # type: ignore
+    return {"token_count": encodings["length"]}
 
 
 def add_token_count(