force unbuffered stdout, skip model download if present

app.py

@@ -1,3 +1,6 @@
+import sys
+sys.stdout.reconfigure(line_buffering=True)
+
 import torch
 import os
 # import spaces  # uncomment when running on ZeroGPU
@@ -12,9 +15,14 @@ from anyaccomp.inference_utils import Sing2SongInferencePipeline
 repo_id = "amphion/anyaccomp"
 base_dir = os.path.dirname(os.path.abspath(__file__))
 
-print(f"Downloading model files from {repo_id}...")
-model_dir = snapshot_download(repo_id=repo_id, local_dir=base_dir)
-print(f"Model files downloaded to: {model_dir}")
+checkpoint_marker = os.path.join(base_dir, "pretrained", "flow_matching")
+if not os.path.exists(checkpoint_marker):
+    print(f"Downloading model files from {repo_id}...", flush=True)
+    model_dir = snapshot_download(repo_id=repo_id, local_dir=base_dir)
+    print(f"Model files downloaded to: {model_dir}", flush=True)
+else:
+    model_dir = base_dir
+    print(f"Model files already present, skipping download.", flush=True)
 
 CFG_PATH = os.path.join(base_dir, "config/flow_matching.json")
 VOCODER_CFG_PATH = os.path.join(base_dir, "config/vocoder.json")