fix(ml): batch axis not being added for recognition model (#12588)

* fix has_batch_axis

* fix typing

machine-learning/app/models/facial_recognition/recognition.py

@@ -13,7 +13,6 @@
 from app.models.base import InferenceModel
 from app.models.transforms import decode_cv2
 from app.schemas import FaceDetectionOutput, FacialRecognitionOutput, ModelFormat, ModelSession, ModelTask, ModelType
-from app.sessions import has_batch_axis
 
 
 class FaceRecognizer(InferenceModel):
@@ -27,7 +26,7 @@ def __init__(self, model_name: str, min_score: float = 0.7, **model_kwargs: Any)
 
     def _load(self) -> ModelSession:
         session = self._make_session(self.model_path)
-        if self.batch and not has_batch_axis(session):
+        if self.batch and str(session.get_inputs()[0].shape[0]) != "batch":
             self._add_batch_axis(self.model_path)
             session = self._make_session(self.model_path)
         self.model = ArcFaceONNX(

machine-learning/app/sessions/__init__.py

@@ -1,5 +0,0 @@
-from app.schemas import ModelSession
-
-
-def has_batch_axis(session: ModelSession) -> bool:
-    return not isinstance(session.get_inputs()[0].shape[0], int) or session.get_inputs()[0].shape[0] < 0