Fix: subprocess install missing deps (transformers, bitsandbytes, accelerate)

app.py

@@ -1,3 +1,20 @@
+import subprocess, sys, importlib
+
+def ensure_deps():
+    """Install missing dependencies at startup."""
+    needed = {
+        "transformers": "transformers>=4.50.0",
+        "bitsandbytes": "bitsandbytes>=0.45.0",
+        "accelerate": "accelerate>=1.5.0",
+    }
+    missing = [pkg for mod, pkg in needed.items() if importlib.util.find_spec(mod) is None]
+    if missing:
+        print(f"📦 Installiere fehlende Dependencies: {missing}")
+        subprocess.check_call([sys.executable, "-m", "pip", "install", "--no-cache-dir"] + missing)
+        print("✅ Dependencies installiert!")
+
+ensure_deps()
+
 import spaces
 import torch
 from transformers import AutoModelForCausalLM, AutoTokenizer, BitsAndBytesConfig
@@ -62,7 +79,6 @@ def chat(message, history, system_prompt, temperature):
     if not message.strip():
         return history
 
-    # Build messages array from history
     messages = []
     if system_prompt:
         messages.append({"role": "system", "content": system_prompt})
@@ -73,10 +89,7 @@ def chat(message, history, system_prompt, temperature):
             messages.append({"role": "assistant", "content": assistant_msg})
     messages.append({"role": "user", "content": message})
 
-    # Generate (this triggers @spaces.GPU)
     response = generate_response(messages, temperature, MAX_TOKENS)
-
-    # Update history
     history.append((message, response))
     return history
 
@@ -133,7 +146,6 @@ with gr.Blocks(
     - **Temperature:** 0.6 (Standard für Coding)
     """)
 
-    # Events
     submit.click(
         fn=chat,
         inputs=[msg, chatbot, system_prompt, temperature],
@@ -154,6 +166,5 @@ with gr.Blocks(
 
     clear_btn.click(fn=lambda: None, outputs=[chatbot])
 
-
 if __name__ == "__main__":
     demo.launch()