feat: prefer model id in request

server/text_generation_server/models/flash_causal_lm.py

@@ -233,8 +233,9 @@ class FlashCausalLMBatch(Batch):
             stopping_criterias.append(stopping_criteria)
             top_n_tokens.append(r.top_n_tokens)
 
-            adapter_indices_list.append(torch.full((input_length,), r.adapter_index))
+            adapter_index = tgi_globals.ADAPTER_TO_INDEX.get(r.adapter_id, 0)
-            adapter_set.add(r.adapter_index)
+            adapter_indices_list.append(torch.full((input_length,), adapter_index))
+            adapter_set.add(adapter_index)
 
             # Paged attention
             # Remove one as the first token des not have a past
@@ -498,7 +499,10 @@ class FlashCausalLMBatch(Batch):
 
             top_n_tokens.append(self.top_n_tokens[idx])
 
-            adapter_set.add(self.requests[idx].adapter_index)
+            adapter_index = tgi_globals.ADAPTER_TO_INDEX.get(
+                self.requests[idx].adapter_id, 0
+            )
+            adapter_set.add(adapter_index)
 
             remaining_tokens = (
                 stopping_criteria.max_new_tokens - stopping_criteria.current_tokens

server/text_generation_server/models/globals.py

@@ -25,3 +25,14 @@ MODEL_ID = None
 def set_model_id(model_id: str):
     global MODEL_ID
     MODEL_ID = model_id
+
+
+# NOTE: eventually we should move this into the router and pass back the
+# index in all cases.
+global ADAPTER_TO_INDEX
+ADAPTER_TO_INDEX = None
+
+
+def set_adapter_to_index(adapter_to_index: dict):
+    global ADAPTER_TO_INDEX
+    ADAPTER_TO_INDEX = adapter_to_index

server/text_generation_server/server.py

@@ -29,7 +29,7 @@ except (ImportError, NotImplementedError):
 
 from text_generation_server.pb import generate_pb2_grpc, generate_pb2
 from text_generation_server.tracing import UDSOpenTelemetryAioServerInterceptor
-from text_generation_server.models.globals import set_model_id
+from text_generation_server.models.globals import set_model_id, set_adapter_to_index
 from text_generation_server.utils.adapter import (
     AdapterParameters,
 )
@@ -216,6 +216,7 @@ def serve(
         trust_remote_code: bool = False,
     ):
         unix_socket_template = "unix://{}-{}"
+        adapter_to_index = {}
         if sharded:
             server_urls = [
                 unix_socket_template.format(uds_path, rank)
@@ -251,6 +252,7 @@ def serve(
                         majority_sign_method=0,
                     )
                     adapter_index = index
+                    adapter_to_index[adapter_id] = adapter_index
                     model.load_adapter(
                         adapter_parameters,
                         None,  # adapter_source
@@ -263,6 +265,7 @@ def serve(
             logger.exception("Error when initializing model")
             raise
 
+        set_adapter_to_index(adapter_to_index)
         server = aio.server(
             interceptors=[
                 ExceptionInterceptor(),