remove un-used imports

Author: liuzijing2014

src/transformers/models/llama4/modeling_llama4.py

@@ -23,7 +23,6 @@
 from dataclasses import dataclass
 from typing import Callable, List, Optional, Tuple, Union
 
-import os
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
@@ -48,7 +47,6 @@
 from ...utils import (
     add_start_docstrings,
     add_start_docstrings_to_model_forward,
-    is_torchdynamo_compiling,
     logging,
     replace_return_docstrings,
 )