[types][shortfin_apps.sd] narrow InferenceExecRequest to SDXLInferenceExecRequest (#1058)

Author: bjacobgordon

shortfin/python/shortfin_apps/sd/components/service.py

@@ -21,7 +21,7 @@
 
 from .config_struct import ModelParams
 from .manager import SystemManager
-from .messages import InferenceExecRequest, InferencePhase
+from .messages import SDXLInferenceExecRequest, InferencePhase
 from .tokenizer import Tokenizer
 from .metrics import measure, log_duration_str
 
@@ -221,9 +221,9 @@ def __init__(
         self.service = service
         self.meta_fiber = meta_fiber
         self.worker_index = meta_fiber.worker_idx
-        self.exec_request: InferenceExecRequest = None
+        self.exec_request: SDXLInferenceExecRequest = None
 
-    def assign_command_buffer(self, request: InferenceExecRequest):
+    def assign_command_buffer(self, request: SDXLInferenceExecRequest):
         for cb in self.meta_fiber.command_buffers:
             if cb.sample.shape[0] == self.exec_request.batch_size:
                 self.exec_request.set_command_buffer(cb)