Bootstrap Streamlit when launched via python

app.py

@@ -1,13 +1,6 @@
 import io
 import os
 import tempfile
-import joblib
-import numpy as np
-import pandas as pd
-import streamlit as st
-import librosa
-import librosa.display
-import matplotlib.pyplot as plt
 from pathlib import Path
 
 BASE_DIR = Path(__file__).resolve().parent
@@ -19,6 +12,36 @@ for cache_dir in (NUMBA_CACHE_DIR, MPL_CACHE_DIR):
 os.environ.setdefault("NUMBA_CACHE_DIR", str(NUMBA_CACHE_DIR))
 os.environ.setdefault("MPLCONFIGDIR", str(MPL_CACHE_DIR))
 
+import joblib
+import numpy as np
+import pandas as pd
+import streamlit as st
+
+if not st.runtime.exists():
+    # Hugging Face Spaces sometimes executes `python app.py`; bootstrap Streamlit manually.
+    from streamlit.web import cli as stcli
+
+    import sys
+
+    port = os.environ.get("PORT", "7860")
+    address = os.environ.get("HOST", "0.0.0.0")
+    sys.argv = [
+        "streamlit",
+        "run",
+        __file__,
+        "--server.port",
+        port,
+        "--server.address",
+        address,
+        "--server.headless",
+        "true",
+    ]
+    sys.exit(stcli.main())
+
+import librosa
+import librosa.display
+import matplotlib.pyplot as plt
+
 from features import extract_features
 from devices import describe_label