Add temporary validation for seed + PP

src/vllm_tgis_adapter/grpc/grpc_server.py

@@ -186,6 +186,9 @@ def __init__(
         self.skip_special_tokens = not args.output_special_tokens
         self.default_include_stop_seqs = args.default_include_stop_seqs
 
+        # Temporary to validate parameters currently broken with PP
+        self.pipeline_parallel = args.pipeline_parallel_size > 1
+
         # Backwards compatibility for TGIS: PREFIX_STORE_PATH
         adapter_cache_path = args.adapter_cache or args.prefix_store_path
         self.adapter_store = (
@@ -504,7 +507,11 @@ async def _validate_and_convert_params(
         """Return (sampling_params, deadline)."""
         # First run TGIS validation to raise errors that match the TGIS api
         try:
-            validate_params(params, self.max_max_new_tokens)
+            validate_params(
+                params,
+                self.max_max_new_tokens,
+                pipeline_parallel=self.pipeline_parallel,
+            )
         except ValueError as tgis_validation_error:
             service_metrics.count_request_failure(FailureReasonLabel.VALIDATION)
             await context.abort(StatusCode.INVALID_ARGUMENT, str(tgis_validation_error))

src/vllm_tgis_adapter/grpc/validation.py

@@ -78,9 +78,11 @@ def validate_input(
         )
 
 
-def validate_params(  # noqa: C901
+def validate_params(  # noqa: C901 PLR0912
     params: Parameters,
     max_max_new_tokens: int,
+    *,
+    pipeline_parallel: bool = False,
 ) -> None:
     """Raise ValueError from the TGISValidationError enum if Parameters is invalid."""
     # TODO: split into checks that are covered by vllm.SamplingParams
@@ -91,6 +93,14 @@ def validate_params(  # noqa: C901
     stopping = params.stopping
     decoding = params.decoding
 
+    # Temporary validation -- this will be removed once we fix use of seed
+    # with pipeline parallel
+    if pipeline_parallel and sampling.HasField("seed") and sampling.seed:
+        raise ValueError(
+            "seed parameter is currently not supported for "
+            "pipeline parallel model deployments"
+        )
+
     # Decoding parameter checks
     if decoding.HasField("length_penalty") and not (
         1.0 <= decoding.length_penalty.decay_factor <= 10.0