dtype last index

Author: Matt Sokoloff

labelbox/data/annotation_types/types.py

@@ -25,9 +25,9 @@ def validate(cls, val, field: ModelField):
             raise TypeError(f"Expected numpy array. Found {type(val)}")
 
         if sys.version_info.minor > 6:
-            actual_dtype = field.sub_fields[1].type_.__args__[0]
+            actual_dtype = field.sub_fields[-1].type_.__args__[0]
         else:
-            actual_dtype = field.sub_fields[1].type_.__values__[0]
+            actual_dtype = field.sub_fields[-1].type_.__values__[0]
 
         if val.dtype != actual_dtype:
             raise TypeError(