diff --git a/GPT_SoVITS/s2_train.py b/GPT_SoVITS/s2_train.py
index 333e6a05..2f0a76e7 100644
--- a/GPT_SoVITS/s2_train.py
+++ b/GPT_SoVITS/s2_train.py
@@ -55,6 +55,10 @@ def main():
         n_gpus = torch.cuda.device_count()
     else:
         n_gpus = 1
+    if n_gpus <= 1:
+        run(0, n_gpus, hps)
+        return
+
     os.environ["MASTER_ADDR"] = "localhost"
     os.environ["MASTER_PORT"] = str(randint(20000, 55555))
 
@@ -69,6 +73,22 @@ def main():
 
 
 def run(rank, n_gpus, hps):
+    use_ddp = n_gpus > 1
+    if use_ddp:
+        dist.init_process_group(
+            backend="gloo" if os.name == "nt" or not torch.cuda.is_available() else "nccl",
+            init_method="env://?use_libuv=False",
+            world_size=n_gpus,
+            rank=rank,
+        )
+    try:
+        _run(rank, n_gpus, hps, use_ddp)
+    finally:
+        if use_ddp and dist.is_initialized():
+            dist.destroy_process_group()
+
+
+def _run(rank, n_gpus, hps, use_ddp):
     global global_step
     if rank == 0:
         logger = utils.get_logger(hps.data.exp_dir)
@@ -76,13 +96,6 @@ def run(rank, n_gpus, hps):
         # utils.check_git_hash(hps.s2_ckpt_dir)
         writer = SummaryWriter(log_dir=hps.s2_ckpt_dir)
         writer_eval = SummaryWriter(log_dir=os.path.join(hps.s2_ckpt_dir, "eval"))
-
-    dist.init_process_group(
-        backend="gloo" if os.name == "nt" or not torch.cuda.is_available() else "nccl",
-        init_method="env://?use_libuv=False",
-        world_size=n_gpus,
-        rank=rank,
-    )
     torch.manual_seed(hps.train.seed)
     if torch.cuda.is_available():
         torch.cuda.set_device(rank)
@@ -196,10 +209,10 @@ def run(rank, n_gpus, hps):
         betas=hps.train.betas,
         eps=hps.train.eps,
     )
-    if torch.cuda.is_available():
+    if torch.cuda.is_available() and use_ddp:
         net_g = DDP(net_g, device_ids=[rank], find_unused_parameters=True)
         net_d = DDP(net_d, device_ids=[rank], find_unused_parameters=True)
-    else:
+    elif not torch.cuda.is_available():
         net_g = net_g.to(device)
         net_d = net_d.to(device)
 
@@ -238,7 +251,7 @@ def run(rank, n_gpus, hps):
                     torch.load(hps.train.pretrained_s2G, map_location="cpu", weights_only=False)["weight"],
                     strict=False,
                 )
-                if torch.cuda.is_available()
+                if hasattr(net_g, "module")
                 else net_g.load_state_dict(
                     torch.load(hps.train.pretrained_s2G, map_location="cpu", weights_only=False)["weight"],
                     strict=False,
@@ -256,7 +269,7 @@ def run(rank, n_gpus, hps):
                 net_d.module.load_state_dict(
                     torch.load(hps.train.pretrained_s2D, map_location="cpu", weights_only=False)["weight"], strict=False
                 )
-                if torch.cuda.is_available()
+                if hasattr(net_d, "module")
                 else net_d.load_state_dict(
                     torch.load(hps.train.pretrained_s2D, map_location="cpu", weights_only=False)["weight"],
                 ),
diff --git a/requirements.txt b/requirements.txt
index 00344838..d6593349 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,10 @@
---no-binary=opencc
 numpy<2.0
 scipy
 tensorboard
 librosa==0.10.2
 numba
 pytorch-lightning>=2.4
-gradio<5
+gradio==4.44.1
 ffmpeg-python
 onnxruntime; platform_machine == "aarch64" or platform_machine == "arm64"
 onnxruntime-gpu; platform_machine == "x86_64" or platform_machine == "AMD64"
@@ -34,7 +33,8 @@ g2pk2
 ko_pron
 opencc
 python_mecab_ko; sys_platform != 'win32'
-fastapi[standard]>=0.115.2
+fastapi[standard]==0.124.0
+starlette==0.49.3
 x_transformers
 torchmetrics<=1.5
 pydantic<=2.10.6