[Feature] add hasher and ImagePosition

fastdeploy/engine/request.py

@@ -42,6 +42,12 @@ class RequestType(Enum):
     PREEMPTED = 2
 
 
+@dataclass
+class ImagePosition:
+    offset: int = 0
+    length: int = 0
+
+
 @dataclass
 class Request:
     def __init__(

fastdeploy/multimodal/hasher.py

@@ -0,0 +1,35 @@
+"""
+# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+
+import hashlib
+import pickle
+
+import numpy as np
+
+from fastdeploy.utils import data_processor_logger
+
+
+class MultimodalHasher:
+
+    @classmethod
+    def hash_features(cls, obj: object) -> str:
+        if isinstance(obj, np.ndarray):
+            return hashlib.sha256((obj.tobytes())).hexdigest()
+
+        data_processor_logger.warning(
+            f"Unsupported type for hashing features: {type(obj)}" + ", use pickle for serialization"
+        )
+        return hashlib.sha256((pickle.dumps(obj))).hexdigest()