Revert fix for ChromaDB ValueError

app.py

@@ -82,7 +82,6 @@ def run_workflow(input, history, compute_mode, thread_id, session_hash):
         if compute_mode == "local":
             gr.Info(
                 f"Please wait for the local model to load",
-                duration=15,
                 title=f"Model loading...",
             )
         # Get the chat model and build the graph

requirements.txt

@@ -29,3 +29,5 @@ spaces==0.37.1
 #boto3==1.39.14
 # Others
 python-dotenv
+# For snapshot_download
+huggingface-hub==0.33.2

retriever.py

@@ -174,9 +174,10 @@ def BuildRetrieverDense(compute_mode: str, top_k=6):
         # Get top k documents
         search_kwargs={"k": top_k},
     )
-    # Fix for ValueError('Could not connect to tenant default_tenant. Are you sure it exists?')
-    # https://github.com/langchain-ai/langchain/issues/26884
-    chromadb.api.client.SharedSystemClient.clear_system_cache()
+    ## Fix for ValueError('Could not connect to tenant default_tenant. Are you sure it exists?')
+    ## ... but it breaks retrieval on ZeroGPU
+    ## https://github.com/langchain-ai/langchain/issues/26884
+    # chromadb.api.client.SharedSystemClient.clear_system_cache()
     return retriever