Update app.py

app.py

@@ -10,6 +10,12 @@ except ImportError as e:
     print("🔧 Make sure you're in the gemmaembeddings conda environment")
     print("📦 Required packages: torch, sentence-transformers, chromadb")
 
+# Global variables for model and collection (initialized lazily)
+model = None
+collection = None
+device = None
+config = Config()
+
 class EmbeddingGemmaPrompts:
     """
     Optimized prompt templates for Google's EmbeddingGemma model.