diff --git a/data_juicer/ops/mapper/extract_qa_mapper.py b/data_juicer/ops/mapper/extract_qa_mapper.py
index 0a1626011..135d8fe14 100644
--- a/data_juicer/ops/mapper/extract_qa_mapper.py
+++ b/data_juicer/ops/mapper/extract_qa_mapper.py
@@ -25,7 +25,6 @@ class ExtractQAMapper(Mapper):
     """
 
     _accelerator = 'cuda'
-    _batched_op = True
 
     def __init__(self,
                  hf_model: str = 'alibaba-pai/pai-qwen1_5-7b-doc2qa',
diff --git a/data_juicer/ops/mapper/generate_instruction_mapper.py b/data_juicer/ops/mapper/generate_instruction_mapper.py
index 1c2ecebe4..5993f0791 100644
--- a/data_juicer/ops/mapper/generate_instruction_mapper.py
+++ b/data_juicer/ops/mapper/generate_instruction_mapper.py
@@ -38,6 +38,7 @@ class GenerateInstructionMapper(Mapper):
     The number of samples generated is determined by
     the length of the empty dataset.
     """
+    _accelerator = 'cuda'
 
     def __init__(self,
                  hf_model,
diff --git a/data_juicer/ops/mapper/optimize_instruction_mapper.py b/data_juicer/ops/mapper/optimize_instruction_mapper.py
index 048c92834..b9c2a09b9 100644
--- a/data_juicer/ops/mapper/optimize_instruction_mapper.py
+++ b/data_juicer/ops/mapper/optimize_instruction_mapper.py
@@ -16,6 +16,7 @@ class OptimizeInstructionMapper(Mapper):
         alibaba-pai/Qwen2-7B-Instruct-Refine
     ]
     """
+    _accelerator = 'cuda'
 
     def __init__(self,
                  hf_model: str = 'alibaba-pai/Qwen2-7B-Instruct-Refine',