refactor: change default block_size in block size > max position embeddings (#26069)

* refactor: change default block_size when not initialize

* reformat: add the min of block size

examples/flax/language-modeling/run_clm_flax.py

@@ -574,9 +574,9 @@ def main():
         if block_size > config.max_position_embeddings:
             logger.warning(
                 f"The tokenizer picked seems to have a very large `model_max_length` ({tokenizer.model_max_length}). "
-                "Picking 1024 instead. You can change that default value by passing --block_size xxx."
+                f"Using block_size={min(1024, config.max_position_embeddings)} instead. You can change that default value by passing --block_size xxx."
             )
-            block_size = 1024
+            block_size = min(1024, config.max_position_embeddings)
     else:
         if data_args.block_size > tokenizer.model_max_length:
             logger.warning(