diff --git a/magic_pdf/data/dataset.py b/magic_pdf/data/dataset.py
index 0ee6e3de..b1eaa259 100644
--- a/magic_pdf/data/dataset.py
+++ b/magic_pdf/data/dataset.py
@@ -9,7 +9,6 @@ from magic_pdf.config.enums import SupportedPdfParseMethod
 from magic_pdf.data.schemas import PageInfo
 from magic_pdf.data.utils import fitz_doc_to_image
 from magic_pdf.filter import classify
-from magic_pdf.model.sub_modules.language_detection.utils import auto_detect_lang
 
 
 class PageableData(ABC):
@@ -149,6 +148,7 @@ class PymuDocDataset(Dataset):
         if lang == '':
             self._lang = None
         elif lang == 'auto':
+            from magic_pdf.model.sub_modules.language_detection.utils import auto_detect_lang
             self._lang = auto_detect_lang(bits)
             logger.info(f"lang: {lang}, detect_lang: {self._lang}")
         else:
diff --git a/magic_pdf/operators/__init__.py b/magic_pdf/operators/__init__.py
index e69de29b..3ad22c35 100644
--- a/magic_pdf/operators/__init__.py
+++ b/magic_pdf/operators/__init__.py
@@ -0,0 +1,97 @@
+from abc import ABC, abstractmethod
+from typing import Callable
+
+from magic_pdf.data.data_reader_writer import DataWriter
+from magic_pdf.data.dataset import Dataset
+from magic_pdf.operators.pipes import PipeResult
+
+__use_inside_model__ = True
+__model_mode__ = 'full'
+
+
+class InferenceResultBase(ABC):
+
+    @abstractmethod
+    def __init__(self, inference_results: list, dataset: Dataset):
+        """Initialized method.
+
+        Args:
+            inference_results (list): the inference result generated by model
+            dataset (Dataset): the dataset related with model inference result
+        """
+        pass
+
+    @abstractmethod
+    def draw_model(self, file_path: str) -> None:
+        """Draw model inference result.
+
+        Args:
+            file_path (str): the output file path
+        """
+        pass
+
+    @abstractmethod
+    def dump_model(self, writer: DataWriter, file_path: str):
+        """Dump model inference result to file.
+
+        Args:
+            writer (DataWriter): writer handle
+            file_path (str): the location of target file
+        """
+        pass
+
+    @abstractmethod
+    def get_infer_res(self):
+        """Get the inference result.
+
+        Returns:
+            list: the inference result generated by model
+        """
+        pass
+
+    @abstractmethod
+    def apply(self, proc: Callable, *args, **kwargs):
+        """Apply callable method which.
+
+        Args:
+            proc (Callable): invoke proc as follows:
+                proc(inference_result, *args, **kwargs)
+
+        Returns:
+            Any: return the result generated by proc
+        """
+        pass
+
+    def pipe_txt_mode(
+        self,
+        imageWriter: DataWriter,
+        start_page_id=0,
+        end_page_id=None,
+        debug_mode=False,
+        lang=None,
+    ) -> PipeResult:
+        """Post-proc the model inference result, Extract the text using the
+        third library, such as `pymupdf`
+
+        Args:
+            imageWriter (DataWriter): the image writer handle
+            start_page_id (int, optional): Defaults to 0. Let user select some pages He/She want to process
+            end_page_id (int, optional):  Defaults to the last page index of dataset. Let user select some pages He/She want to process
+            debug_mode (bool, optional): Defaults to False. will dump more log if enabled
+            lang (str, optional): Defaults to None.
+
+        Returns:
+            PipeResult: the result
+        """
+        pass
+
+    @abstractmethod
+    def pipe_ocr_mode(
+        self,
+        imageWriter: DataWriter,
+        start_page_id=0,
+        end_page_id=None,
+        debug_mode=False,
+        lang=None,
+    ) -> PipeResult:
+        pass
diff --git a/magic_pdf/operators/models.py b/magic_pdf/operators/models.py
index 5c044c71..34cbfe4b 100644
--- a/magic_pdf/operators/models.py
+++ b/magic_pdf/operators/models.py
@@ -11,9 +11,9 @@ from magic_pdf.libs.draw_bbox import draw_model_bbox
 from magic_pdf.libs.version import __version__
 from magic_pdf.operators.pipes import PipeResult
 from magic_pdf.pdf_parse_union_core_v2 import pdf_parse_union
+from magic_pdf.operators import InferenceResultBase
 
-
-class InferenceResult:
+class InferenceResult(InferenceResultBase):
     def __init__(self, inference_results: list, dataset: Dataset):
         """Initialized method.
 
diff --git a/next_docs/en/api/model_operators.rst b/next_docs/en/api/model_operators.rst
index c6900441..7f62632d 100644
--- a/next_docs/en/api/model_operators.rst
+++ b/next_docs/en/api/model_operators.rst
@@ -2,7 +2,7 @@
 Model Api
 ==========
 
-.. autoclass:: magic_pdf.operators.models.InferenceResult
+.. autoclass:: magic_pdf.operators.InferenceResultBase
    :members:
    :inherited-members:
    :show-inheritance: