diff --git a/modelscope/pipelines/nlp/conversational_text_to_sql_pipeline.py b/modelscope/pipelines/nlp/conversational_text_to_sql_pipeline.py
index 399dad5a..c46e8c81 100644
--- a/modelscope/pipelines/nlp/conversational_text_to_sql_pipeline.py
+++ b/modelscope/pipelines/nlp/conversational_text_to_sql_pipeline.py
@@ -11,8 +11,8 @@ from modelscope.outputs import OutputKeys
 from modelscope.pipelines.base import Pipeline
 from modelscope.pipelines.builder import PIPELINES
 from modelscope.preprocessors import ConversationalTextToSqlPreprocessor
-from modelscope.preprocessors.star.fields.common_utils import SubPreprocessor
-from modelscope.preprocessors.star.fields.process_dataset import process_tables
+from modelscope.preprocessors.star.fields import (SubPreprocessor,
+                                                  process_tables)
 from modelscope.utils.constant import Tasks
 
 __all__ = ['ConversationalTextToSqlPipeline']
diff --git a/modelscope/pipelines/nlp/word_segmentation_pipeline.py b/modelscope/pipelines/nlp/word_segmentation_pipeline.py
index 66a5c524..9899243e 100644
--- a/modelscope/pipelines/nlp/word_segmentation_pipeline.py
+++ b/modelscope/pipelines/nlp/word_segmentation_pipeline.py
@@ -94,4 +94,4 @@ class WordSegmentationPipeline(Pipeline):
         if chunk:
             chunks.append(chunk)
         seg_result = ' '.join(chunks)
-        return {OutputKeys.OUTPUT: seg_result}
+        return {OutputKeys.OUTPUT: seg_result, OutputKeys.LABELS: []}
diff --git a/modelscope/preprocessors/nlp.py b/modelscope/preprocessors/nlp.py
index 84e7ca4d..9137b105 100644
--- a/modelscope/preprocessors/nlp.py
+++ b/modelscope/preprocessors/nlp.py
@@ -16,7 +16,7 @@ from modelscope.utils.config import Config, ConfigFields
 from modelscope.utils.constant import Fields, InputFields, ModeKeys, ModelFile
 from modelscope.utils.hub import get_model_type, parse_label_mapping
 from modelscope.utils.logger import get_logger
-from modelscope.utils.nlp.nlp_utils import import_external_nltk_data
+from modelscope.utils.nlp import import_external_nltk_data
 from modelscope.utils.type_assert import type_assert
 from .base import Preprocessor
 from .builder import PREPROCESSORS
diff --git a/modelscope/preprocessors/star/__init__.py b/modelscope/preprocessors/star/__init__.py
index 5a4bcea9..cef8f074 100644
--- a/modelscope/preprocessors/star/__init__.py
+++ b/modelscope/preprocessors/star/__init__.py
@@ -6,7 +6,8 @@ from modelscope.utils.import_utils import LazyImportModule
 if TYPE_CHECKING:
     from .conversational_text_to_sql_preprocessor import \
         ConversationalTextToSqlPreprocessor
-    from .fields import MultiWOZBPETextField, IntentBPETextField
+    from .fields import (get_label, SubPreprocessor, preprocess_dataset,
+                         process_dataset)
 
 else:
     _import_structure = {
diff --git a/modelscope/preprocessors/star/fields/__init__.py b/modelscope/preprocessors/star/fields/__init__.py
index 1e95a998..7049c43b 100644
--- a/modelscope/preprocessors/star/fields/__init__.py
+++ b/modelscope/preprocessors/star/fields/__init__.py
@@ -1,6 +1,30 @@
-from modelscope.preprocessors.star.fields.common_utils import SubPreprocessor
-from modelscope.preprocessors.star.fields.parse import get_label
-from modelscope.preprocessors.star.fields.preprocess_dataset import \
-    preprocess_dataset
-from modelscope.preprocessors.star.fields.process_dataset import \
-    process_dataset
+# Copyright (c) Alibaba, Inc. and its affiliates.
+from typing import TYPE_CHECKING
+
+from modelscope.utils.import_utils import LazyImportModule
+
+if TYPE_CHECKING:
+    from .common_utils import SubPreprocessor
+    from .parse import get_label
+    from .preprocess_dataset import \
+        preprocess_dataset
+    from .process_dataset import \
+        process_dataset, process_tables
+
+else:
+    _import_structure = {
+        'common_utils': ['SubPreprocessor'],
+        'parse': ['get_label'],
+        'preprocess_dataset': ['preprocess_dataset'],
+        'process_dataset': ['process_dataset', 'process_tables'],
+    }
+
+    import sys
+
+    sys.modules[__name__] = LazyImportModule(
+        __name__,
+        globals()['__file__'],
+        _import_structure,
+        module_spec=__spec__,
+        extra_objects={},
+    )
diff --git a/modelscope/utils/nlp/__init__.py b/modelscope/utils/nlp/__init__.py
index e69de29b..62c0b888 100644
--- a/modelscope/utils/nlp/__init__.py
+++ b/modelscope/utils/nlp/__init__.py
@@ -0,0 +1,22 @@
+# Copyright (c) Alibaba, Inc. and its affiliates.
+from typing import TYPE_CHECKING
+
+from modelscope.utils.import_utils import LazyImportModule
+
+if TYPE_CHECKING:
+    from .utils import import_external_nltk_data
+
+else:
+    _import_structure = {
+        'utils': ['import_external_nltk_data'],
+    }
+
+    import sys
+
+    sys.modules[__name__] = LazyImportModule(
+        __name__,
+        globals()['__file__'],
+        _import_structure,
+        module_spec=__spec__,
+        extra_objects={},
+    )
diff --git a/modelscope/utils/nlp/nlp_utils.py b/modelscope/utils/nlp/nlp_utils.py
index 64b12007..af539dda 100644
--- a/modelscope/utils/nlp/nlp_utils.py
+++ b/modelscope/utils/nlp/nlp_utils.py
@@ -42,22 +42,3 @@ def tracking_and_print_dialog_states(
         print(json.dumps(result))
 
         history_states.extend([result[OutputKeys.OUTPUT], {}])
-
-
-def import_external_nltk_data(nltk_data_dir, package_name):
-    """import external nltk_data, and extract nltk zip package.
-
-    Args:
-        nltk_data_dir (str): external nltk_data dir path, eg. /home/xx/nltk_data
-        package_name (str): nltk package name, eg. tokenizers/punkt
-    """
-    import nltk
-    nltk.data.path.append(nltk_data_dir)
-
-    filepath = osp.join(nltk_data_dir, package_name + '.zip')
-    zippath = osp.join(nltk_data_dir, package_name)
-    packagepath = osp.dirname(zippath)
-    if not osp.exists(zippath):
-        import zipfile
-        with zipfile.ZipFile(filepath) as zf:
-            zf.extractall(osp.join(packagepath))
diff --git a/modelscope/utils/nlp/utils.py b/modelscope/utils/nlp/utils.py
new file mode 100644
index 00000000..13a21480
--- /dev/null
+++ b/modelscope/utils/nlp/utils.py
@@ -0,0 +1,20 @@
+import os.path as osp
+
+
+def import_external_nltk_data(nltk_data_dir, package_name):
+    """import external nltk_data, and extract nltk zip package.
+
+    Args:
+        nltk_data_dir (str): external nltk_data dir path, eg. /home/xx/nltk_data
+        package_name (str): nltk package name, eg. tokenizers/punkt
+    """
+    import nltk
+    nltk.data.path.append(nltk_data_dir)
+
+    filepath = osp.join(nltk_data_dir, package_name + '.zip')
+    zippath = osp.join(nltk_data_dir, package_name)
+    packagepath = osp.dirname(zippath)
+    if not osp.exists(zippath):
+        import zipfile
+        with zipfile.ZipFile(filepath) as zf:
+            zf.extractall(osp.join(packagepath))
diff --git a/modelscope/utils/test_utils.py b/modelscope/utils/test_utils.py
index 8fb621d3..5109db11 100644
--- a/modelscope/utils/test_utils.py
+++ b/modelscope/utils/test_utils.py
@@ -11,7 +11,7 @@ import sys
 import tarfile
 import tempfile
 import unittest
-from typing import OrderedDict
+from collections import OrderedDict
 
 import requests
 import torch