diff --git a/learnware/market/anchor/organizer.py b/learnware/market/anchor/organizer.py
index 405060b..4c3b668 100644
--- a/learnware/market/anchor/organizer.py
+++ b/learnware/market/anchor/organizer.py
@@ -1,9 +1,8 @@
-from typing import List, Dict, Tuple, Any
+from typing import Dict
 
 from ..easy.organizer import EasyOrganizer
 from ...logger import get_module_logger
 from ...learnware import Learnware
-from ...specification import BaseStatSpecification
 
 logger = get_module_logger("anchor_organizer")
 
diff --git a/learnware/market/anchor/searcher.py b/learnware/market/anchor/searcher.py
index 34d326d..60bca9f 100644
--- a/learnware/market/anchor/searcher.py
+++ b/learnware/market/anchor/searcher.py
@@ -1,7 +1,6 @@
-from typing import List, Dict, Tuple, Any, Union
+from typing import List, Tuple, Any
 
 from .user_info import AnchoredUserInfo
-from ..base import BaseUserInfo
 from ..easy.searcher import EasySearcher
 from ...logger import get_module_logger
 from ...learnware import Learnware
diff --git a/learnware/market/base.py b/learnware/market/base.py
index 78d06e6..fce2f18 100644
--- a/learnware/market/base.py
+++ b/learnware/market/base.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import traceback
 import zipfile
 import tempfile
-from typing import Tuple, Any, List, Union, Dict, Optional
+from typing import Tuple, Any, List, Union, Optional
 from dataclasses import dataclass
 from ..learnware import Learnware, get_learnware_from_dirpath
 from ..logger import get_module_logger
@@ -45,7 +45,7 @@ class BaseUserInfo:
 
     def update_semantic_spec(self, semantic_spec: dict):
         self.semantic_spec = semantic_spec
-        
+
     def update_stat_info(self, name: str, item: Any):
         """Update stat_info by market
 
@@ -64,28 +64,35 @@ class SingleSearchItem:
     learnware: Learnware
     score: Optional[float] = None
 
+
 @dataclass
 class MultipleSearchItem:
     learnwares: List[Learnware]
     score: float
-    
+
+
 class SearchResults:
-    def __init__(self, single_results: Optional[List[SingleSearchItem]] = None, multiple_results: Optional[List[MultipleSearchItem]] = None):
+    def __init__(
+        self,
+        single_results: Optional[List[SingleSearchItem]] = None,
+        multiple_results: Optional[List[MultipleSearchItem]] = None,
+    ):
         self.update_single_results([] if single_results is None else single_results)
         self.update_multiple_results([] if multiple_results is None else multiple_results)
-        
+
     def get_single_results(self) -> List[SingleSearchItem]:
         return self.single_results
-    
+
     def get_multiple_results(self) -> List[MultipleSearchItem]:
         return self.multiple_results
-    
+
     def update_single_results(self, single_results: List[SingleSearchItem]):
         self.single_results = single_results
-    
+
     def update_multiple_results(self, multiple_results: List[MultipleSearchItem]):
         self.multiple_results = multiple_results
 
+
 class LearnwareMarket:
     """Base interface for market, it provide the interface of search/add/detele/update learnwares"""
 
@@ -179,9 +186,7 @@ class LearnwareMarket:
             zip_path=zip_path, semantic_spec=semantic_spec, check_status=check_status, **kwargs
         )
 
-    def search_learnware(
-        self, user_info: BaseUserInfo, check_status: int = None, **kwargs
-    ) -> SearchResults:
+    def search_learnware(self, user_info: BaseUserInfo, check_status: int = None, **kwargs) -> SearchResults:
         """Search learnwares based on user_info from learnwares with check_status
 
         Parameters
diff --git a/learnware/market/easy/database_ops.py b/learnware/market/easy/database_ops.py
index 7f8e87c..e27577c 100644
--- a/learnware/market/easy/database_ops.py
+++ b/learnware/market/easy/database_ops.py
@@ -1,6 +1,6 @@
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy import create_engine, text
-from sqlalchemy import Column, Integer, Text, DateTime, String
+from sqlalchemy import Column, Text, String
 import os
 import json
 import traceback
diff --git a/learnware/market/heterogeneous/organizer/hetero_map/__init__.py b/learnware/market/heterogeneous/organizer/hetero_map/__init__.py
index 2e31195..b2f39fe 100644
--- a/learnware/market/heterogeneous/organizer/hetero_map/__init__.py
+++ b/learnware/market/heterogeneous/organizer/hetero_map/__init__.py
@@ -1,15 +1,15 @@
-from typing import Callable, List, Optional, Union
+from typing import Callable, Union
 
 import numpy as np
 import pandas as pd
 import torch
 import torch.nn.functional as F
-from torch import Tensor, nn
+from torch import nn
 
 from .....utils import allocate_cuda_idx, choose_device
 from .....specification import HeteroMapTableSpecification, RKMETableSpecification
 from .feature_extractor import CLSToken, FeatureProcessor, FeatureTokenizer
-from .trainer import Trainer, TransTabCollatorForCL
+from .trainer import TransTabCollatorForCL, Trainer
 
 
 class HeteroMap(nn.Module):
@@ -127,6 +127,7 @@ class HeteroMap(nn.Module):
         self.base_temperature = base_temperature
         self.num_partition = num_partition
         self.overlap_ratio = overlap_ratio
+        self.max_process_size = 20480
         self.to(device)
 
     def to(self, device: Union[str, torch.device]):
@@ -306,6 +307,10 @@ class HeteroMap(nn.Module):
         """
         self.eval()
         output_feas_list = []
+
+        if eval_batch_size * x_test.shape[1] > self.max_process_size:
+            eval_batch_size = max(1, self.max_process_size // x_test.shape[1])
+
         for i in range(0, len(x_test), eval_batch_size):
             bs_x_test = x_test.iloc[i : i + eval_batch_size]
             with torch.no_grad():
diff --git a/learnware/market/heterogeneous/organizer/hetero_map/feature_extractor.py b/learnware/market/heterogeneous/organizer/hetero_map/feature_extractor.py
index d98bd2e..325f74e 100644
--- a/learnware/market/heterogeneous/organizer/hetero_map/feature_extractor.py
+++ b/learnware/market/heterogeneous/organizer/hetero_map/feature_extractor.py
@@ -1,6 +1,6 @@
 import math
 import os
-from typing import Callable, Dict, List, Union
+from typing import Dict, List, Union
 
 import numpy as np
 import pandas as pd