Clean up imports (#5467)

python/sglang/srt/utils.py

@@ -55,7 +55,6 @@ import torch.distributed
 import torch.distributed as dist
 import triton
 import zmq
-from decord import VideoReader, cpu
 from fastapi.responses import ORJSONResponse
 from packaging import version as pkg_version
 from PIL import Image
@@ -545,6 +544,9 @@ def load_audio(audio_file: str, sr: int = 16000, mono: bool = True) -> np.ndarra
 
 
 def encode_video(video_path, frame_count_limit=None):
+    # Lazy import because decord is not available on some arm platforms.
+    from decord import VideoReader, cpu
+
     if not os.path.exists(video_path):
         logger.error(f"Video {video_path} does not exist")
         return []