Don't allow appending different data types

model_server/base/accessors.py

@@ -181,6 +181,8 @@ class GenericImageDataAccessor(ABC):
         }
 
     def append_channels(self, acc):
+        if self.dtype != acc.dtype:
+            raise DataTypeError(f'Cannot append data of type {acc.dtype} to an accessor with type {self.dtype}')
         return self._derived_accessor(
             np.concatenate(
                 (self.data, acc.data),
@@ -570,6 +572,9 @@ class FileNotFoundError(Error):
 class DataShapeError(Error):
     pass
 
+class DataTypeError(Error):
+    pass
+
 class FileWriteError(Error):
     pass