diff --git a/learnware/__init__.py b/learnware/__init__.py
index 322be04..c3f122e 100644
--- a/learnware/__init__.py
+++ b/learnware/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.2.0.3"
+__version__ = "0.2.0.4"
 
 import os
 import json
@@ -55,7 +55,7 @@ def init(verbose=True, **kwargs):
 
 if not is_torch_available(verbose=False):
     logger.warning(
-        "The ability of learnware is limited due to 'torch' is not installed! Only the core framework is available now."
+        "The learnware package's capabilities are restricted because 'torch' is not installed. Only the core framework is available now."
     )
 
 # default init package
diff --git a/learnware/market/anchor/__init__.py b/learnware/market/anchor/__init__.py
index d1b8392..2e2763c 100644
--- a/learnware/market/anchor/__init__.py
+++ b/learnware/market/anchor/__init__.py
@@ -8,6 +8,6 @@ logger = get_module_logger("market_anchor")
 
 if not is_torch_available(verbose=False):
     AnchoredSearcher = None
-    logger.warning("AnchoredSearcher is skipped because 'torch' is not installed!")
+    logger.error("AnchoredSearcher is not available because 'torch' is not installed!")
 else:
     from .searcher import AnchoredSearcher
diff --git a/learnware/market/easy/__init__.py b/learnware/market/easy/__init__.py
index 7495ee5..2605999 100644
--- a/learnware/market/easy/__init__.py
+++ b/learnware/market/easy/__init__.py
@@ -9,7 +9,7 @@ if not is_torch_available(verbose=False):
     EasySearcher = None
     EasySemanticChecker = None
     EasyStatChecker = None
-    logger.warning("EasySeacher and EasyChecker are skipped because 'torch' is not installed!")
+    logger.error("EasySeacher and EasyChecker are not available because 'torch' is not installed!")
 else:
     from .searcher import EasySearcher, EasyStatSearcher, EasyFuzzSemanticSearcher, EasyExactSemanticSearcher
     from .checker import EasySemanticChecker, EasyStatChecker
diff --git a/learnware/reuse/__init__.py b/learnware/reuse/__init__.py
index f379429..1e2d289 100644
--- a/learnware/reuse/__init__.py
+++ b/learnware/reuse/__init__.py
@@ -2,43 +2,23 @@ from .base import BaseReuser
 from .align import AlignLearnware
 
 from ..logger import get_module_logger
-from ..utils import is_torch_available, get_platform, SystemType
-from .utils import is_geatpy_available, is_lightgbm_available
+from ..utils import is_torch_available
 
 logger = get_module_logger("reuse")
 
-if not is_geatpy_available(verbose=False):
-    EnsemblePruningReuser = None
-    logger.warning("EnsemblePruningReuser is skipped due to 'geatpy' is not installed!")
-else:
-    from .ensemble_pruning import EnsemblePruningReuser
-
 if not is_torch_available(verbose=False):
     AveragingReuser = None
     FeatureAugmentReuser = None
     HeteroMapAlignLearnware = None
     FeatureAlignLearnware = None
-    logger.warning(
-        "[AveragingReuser, FeatureAugmentReuser, HeteroMapAlignLearnware, FeatureAlignLearnware] is skipped due to 'torch' is not installed!"
+    JobSelectorReuser = None
+    EnsemblePruningReuser = None
+    logger.error(
+        "[AveragingReuser, FeatureAugmentReuser, HeteroMapAlignLearnware, FeatureAlignLearnware, JobSelectorReuser, EnsemblePruningReuser] are not available due to 'torch' is not installed!"
     )
 else:
     from .averaging import AveragingReuser
     from .feature_augment import FeatureAugmentReuser
     from .hetero import HeteroMapAlignLearnware, FeatureAlignLearnware
-
-if not is_lightgbm_available(verbose=False) or not is_torch_available(verbose=False):
-    JobSelectorReuser = None
-    uninstall_packages = [
-        value
-        for flag, value in zip(
-            [
-                is_lightgbm_available(verbose=False),
-                is_torch_available(verbose=False),
-            ],
-            ["lightgbm", "torch"],
-        )
-        if flag is False
-    ]
-    logger.warning(f"JobSelectorReuser is skipped due to {uninstall_packages} is not installed!")
-else:
     from .job_selector import JobSelectorReuser
+    from .ensemble_pruning import EnsemblePruningReuser
\ No newline at end of file
diff --git a/learnware/reuse/ensemble_pruning.py b/learnware/reuse/ensemble_pruning.py
index f937dbd..49c65b5 100644
--- a/learnware/reuse/ensemble_pruning.py
+++ b/learnware/reuse/ensemble_pruning.py
@@ -1,7 +1,6 @@
 import torch
 import random
 import numpy as np
-import geatpy as ea
 from typing import List
 
 from ..learnware import Learnware
@@ -54,6 +53,13 @@ class EnsemblePruningReuser(BaseReuser):
         np.ndarray
             Binary one-dimensional vector, 1 indicates that the corresponding model is selected.
         """
+        
+        
+        try:
+            import geatpy as ea
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"EnsemblePruningReuser is not available because 'geatpy' is not installed! Please install it manually (only support python_version<3.11).")
+           
         model_num = v_predict.shape[1]
 
         @ea.Problem.single
@@ -138,6 +144,12 @@ class EnsemblePruningReuser(BaseReuser):
         np.ndarray
             Binary one-dimensional vector, 1 indicates that the corresponding model is selected.
         """
+        try:
+            import geatpy as ea
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"EnsemblePruningReuser is not available because 'geatpy' is not installed! Please install it manually (only support python_version<3.11).")
+           
+
         model_num = v_predict.shape[1]
 
         def find_top_two_freq(row):
@@ -252,6 +264,11 @@ class EnsemblePruningReuser(BaseReuser):
         np.ndarray
             Binary one-dimensional vector, 1 indicates that the corresponding model is selected.
         """
+        try:
+            import geatpy as ea
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"EnsemblePruningReuser is not available because 'geatpy' is not installed! Please install it manually (only support python_version<3.11).")
+           
         model_num = v_predict.shape[1]
         v_predict[v_predict == 0.0] = -1
         v_true[v_true == 0.0] = -1
diff --git a/learnware/reuse/job_selector.py b/learnware/reuse/job_selector.py
index 91ad512..467e063 100644
--- a/learnware/reuse/job_selector.py
+++ b/learnware/reuse/job_selector.py
@@ -2,7 +2,6 @@ import torch
 import numpy as np
 
 from typing import List, Union
-from lightgbm import LGBMClassifier, early_stopping
 from sklearn.metrics import accuracy_score
 
 from .base import BaseReuser
@@ -196,7 +195,7 @@ class JobSelectorReuser(BaseReuser):
         val_x: np.ndarray,
         val_y: np.ndarray,
         num_class: int,
-    ) -> LGBMClassifier:
+    ):
         """Train a LGBMClassifier as job selector using the herding data as training instances.
 
         Parameters
@@ -221,6 +220,11 @@ class JobSelectorReuser(BaseReuser):
         LGBMClassifier
             The job selector model.
         """
+        try:
+            from lightgbm import LGBMClassifier, early_stopping
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"JobSelectorReuser is not available because 'lightgbm' is not installed! Please install it manually.")
+           
         score_best = -1
         learning_rate = [0.01]
         max_depth = [66]
diff --git a/learnware/reuse/utils.py b/learnware/reuse/utils.py
index a85135f..17430dc 100644
--- a/learnware/reuse/utils.py
+++ b/learnware/reuse/utils.py
@@ -3,29 +3,6 @@ from ..logger import get_module_logger
 
 logger = get_module_logger("reuse_utils")
 
-
-def is_geatpy_available(verbose=False):
-    try:
-        import geatpy
-    except ModuleNotFoundError as err:
-        if verbose is True:
-            logger.warning(
-                "ModuleNotFoundError: geatpy is not installed, please install geatpy (only support python version<3.11)!"
-            )
-        return False
-    return True
-
-
-def is_lightgbm_available(verbose=False):
-    try:
-        import lightgbm
-    except ModuleNotFoundError as err:
-        if verbose is True:
-            logger.warning("ModuleNotFoundError: lightgbm is not installed, please install lightgbm!")
-        return False
-    return True
-
-
 def fill_data_with_mean(X: np.ndarray) -> np.ndarray:
     """
     Fill missing data (NaN, Inf) in the input array with the mean of the column.
diff --git a/learnware/specification/regular/__init__.py b/learnware/specification/regular/__init__.py
index 0c8b05d..fc95950 100644
--- a/learnware/specification/regular/__init__.py
+++ b/learnware/specification/regular/__init__.py
@@ -1,6 +1,4 @@
 from .base import RegularStatSpecification
-from ...utils import is_torch_available
-
 from .text import RKMETextSpecification
 from .table import RKMETableSpecification, RKMEStatSpecification, rkme_solve_qp
 from .image import RKMEImageSpecification
diff --git a/learnware/specification/regular/image/__init__.py b/learnware/specification/regular/image/__init__.py
index 224d875..d76b56b 100644
--- a/learnware/specification/regular/image/__init__.py
+++ b/learnware/specification/regular/image/__init__.py
@@ -1,29 +1,11 @@
-from .utils import is_torch_optimizer_available, is_torchvision_available
 from ....utils import is_torch_available
 from ....logger import get_module_logger
 
 
 logger = get_module_logger("regular_image_spec")
 
-if (
-    not is_torchvision_available(verbose=False)
-    or not is_torch_optimizer_available(verbose=False)
-    or not is_torch_available(verbose=False)
-):
+if not is_torch_available(verbose=False):
     RKMEImageSpecification = None
-    uninstall_packages = [
-        value
-        for flag, value in zip(
-            [
-                is_torchvision_available(verbose=False),
-                is_torch_optimizer_available(verbose=False),
-                is_torch_available(verbose=False),
-            ],
-            ["torchvision", "torch-optimizer", "torch"],
-        )
-        if flag is False
-    ]
-
-    logger.warning(f"RKMEImageSpecification is skipped because {uninstall_packages} is not installed!")
+    logger.error(f"RKMEImageSpecification is not available because 'torch' is not installed!")
 else:
     from .rkme import RKMEImageSpecification
diff --git a/learnware/specification/regular/image/rkme.py b/learnware/specification/regular/image/rkme.py
index e65f23d..1f9a4a1 100644
--- a/learnware/specification/regular/image/rkme.py
+++ b/learnware/specification/regular/image/rkme.py
@@ -10,10 +10,8 @@ from typing import Any
 
 import numpy as np
 import torch
-import torch_optimizer
 from torch import nn
 from torch.utils.data import TensorDataset, DataLoader
-from torchvision.transforms import Resize
 from tqdm import tqdm
 
 from . import cnn_gp
@@ -126,7 +124,11 @@ class RKMEImageSpecification(RegularStatSpecification):
                         raise ValueError(f"All values in image {i} are exceptional, e.g., NaN and Inf.")
                     img_mean = torch.nanmean(img)
                     X[i] = torch.where(is_nan, img_mean, img)
-
+        try:
+            from torchvision.transforms import Resize
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"RKMEImageSpecification is not available because 'torchvision' is not installed! Please install it manually." )
+            
         if X.shape[2] != RKMEImageSpecification.IMAGE_WIDTH or X.shape[3] != RKMEImageSpecification.IMAGE_WIDTH:
             X = Resize((RKMEImageSpecification.IMAGE_WIDTH, RKMEImageSpecification.IMAGE_WIDTH), antialias=None)(X)
 
@@ -152,7 +154,12 @@ class RKMEImageSpecification(RegularStatSpecification):
         with torch.no_grad():
             x_features = self._generate_random_feature(X_train, random_models=random_models)
         self._update_beta(x_features, nonnegative_beta, random_models=random_models)
-
+        
+        try:
+            import torch_optimizer
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"RKMEImageSpecification is not available because 'torch-optimizer' is not installed! Please install it manually.")
+        
         optimizer = torch_optimizer.AdaBelief([{"params": [self.z]}], lr=step_size, eps=1e-16)
 
         for _ in tqdm(range(steps)) if verbose else range(steps):
diff --git a/learnware/specification/regular/image/utils.py b/learnware/specification/regular/image/utils.py
deleted file mode 100644
index cd60d96..0000000
--- a/learnware/specification/regular/image/utils.py
+++ /dev/null
@@ -1,23 +0,0 @@
-from ....logger import get_module_logger
-
-logger = get_module_logger("regular_image_spec_utils")
-
-
-def is_torch_optimizer_available(verbose=False):
-    try:
-        import torch_optimizer
-    except ModuleNotFoundError as err:
-        if verbose is True:
-            logger.warning("ModuleNotFoundError: torch_optimizer is not installed, please install torch_optimizer!")
-        return False
-    return True
-
-
-def is_torchvision_available(verbose=False):
-    try:
-        import torchvision
-    except ModuleNotFoundError as err:
-        if verbose is True:
-            logger.warning("ModuleNotFoundError: torchvision is not installed, please install torchvision!")
-        return False
-    return True
diff --git a/learnware/specification/regular/table/__init__.py b/learnware/specification/regular/table/__init__.py
index a380ea3..d816907 100644
--- a/learnware/specification/regular/table/__init__.py
+++ b/learnware/specification/regular/table/__init__.py
@@ -1,27 +1,14 @@
-from .utils import is_fast_pytorch_kmeans_available
-
 from ....utils import is_torch_available
 from ....logger import get_module_logger
 
 logger = get_module_logger("regular_table_spec")
 
-if not is_torch_available(verbose=False) or not is_fast_pytorch_kmeans_available(verbose=False):
+if not is_torch_available(verbose=False):
     RKMETableSpecification = None
     RKMEStatSpecification = None
     rkme_solve_qp = None
-    uninstall_packages = [
-        value
-        for flag, value in zip(
-            [
-                is_torch_available(verbose=False),
-                is_fast_pytorch_kmeans_available(verbose=False),
-            ],
-            ["torch", "fast_pytorch_kmeans"],
-        )
-        if flag is False
-    ]
-    logger.warning(
-        f"RKMETableSpecification, RKMEStatSpecification and rkme_solve_qp are skipped because {uninstall_packages} is not installed!"
+    logger.error(
+        f"RKMETableSpecification, RKMEStatSpecification and rkme_solve_qp are not available because 'torch' is not installed!"
     )
 else:
     from .rkme import RKMETableSpecification, RKMEStatSpecification, rkme_solve_qp
diff --git a/learnware/specification/regular/table/rkme.py b/learnware/specification/regular/table/rkme.py
index 68cfc1f..f335f4d 100644
--- a/learnware/specification/regular/table/rkme.py
+++ b/learnware/specification/regular/table/rkme.py
@@ -9,7 +9,6 @@ import numpy as np
 from qpsolvers import solve_qp, Problem, solve_problem
 from collections import Counter
 from typing import Any, Union
-from fast_pytorch_kmeans import KMeans
 
 from ..base import RegularStatSpecification
 from ....logger import get_module_logger
@@ -143,6 +142,12 @@ class RKMETableSpecification(RegularStatSpecification):
             X = torch.from_numpy(X)
             
         X = X.to(self._device)
+        
+        try:
+            from fast_pytorch_kmeans import KMeans
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"RKMETableSpecification is not available because 'fast_pytorch_kmeans' is not installed! Please install it manually." )
+
         kmeans = KMeans(n_clusters=K, mode='euclidean', max_iter=100, verbose=0)
         kmeans.fit(X)
         self.z = kmeans.centroids.double()
diff --git a/learnware/specification/regular/table/utils.py b/learnware/specification/regular/table/utils.py
deleted file mode 100644
index 3243b72..0000000
--- a/learnware/specification/regular/table/utils.py
+++ /dev/null
@@ -1,15 +0,0 @@
-from ....logger import get_module_logger
-
-logger = get_module_logger("regular_table_spec_utils")
-
-
-def is_fast_pytorch_kmeans_available(verbose=False):
-    try:
-        import fast_pytorch_kmeans
-    except ModuleNotFoundError as err:
-        if verbose is True:
-            logger.warning(
-                "ModuleNotFoundError: fast_pytorch_kmeans is not installed, please install fast_pytorch_kmeans!"
-            )
-        return False
-    return True
diff --git a/learnware/specification/regular/text/__init__.py b/learnware/specification/regular/text/__init__.py
index eda4208..23f1a91 100644
--- a/learnware/specification/regular/text/__init__.py
+++ b/learnware/specification/regular/text/__init__.py
@@ -1,29 +1,10 @@
-from .utils import is_sentence_transformers_available
-from ..table.utils import is_fast_pytorch_kmeans_available
-
 from ....utils import is_torch_available
 from ....logger import get_module_logger
 
 logger = get_module_logger("regular_text_spec")
 
-if (
-    not is_sentence_transformers_available(verbose=False)
-    or not is_torch_available(verbose=False)
-    or not is_fast_pytorch_kmeans_available(verbose=False)
-):
+if not is_torch_available(verbose=False):
     RKMETextSpecification = None
-    uninstall_packages = [
-        value
-        for flag, value in zip(
-            [
-                is_sentence_transformers_available(verbose=False),
-                is_torch_available(verbose=False),
-                is_fast_pytorch_kmeans_available(verbose=False),
-            ],
-            ["sentence_transformers", "torch", "fast_pytorch_kmeans"],
-        )
-        if flag is False
-    ]
-    logger.warning(f"RKMETextSpecification is skipped because {uninstall_packages} is not installed!")
+    logger.error(f"RKMETextSpecification is not available because 'torch' is not installed!")
 else:
     from .rkme import RKMETextSpecification
diff --git a/learnware/specification/regular/text/rkme.py b/learnware/specification/regular/text/rkme.py
index aa7d72e..0396d24 100644
--- a/learnware/specification/regular/text/rkme.py
+++ b/learnware/specification/regular/text/rkme.py
@@ -1,7 +1,6 @@
 import os
 import langdetect
 import numpy as np
-from sentence_transformers import SentenceTransformer
 
 from ..table import RKMETableSpecification
 from ....logger import get_module_logger
@@ -87,6 +86,12 @@ class RKMETextSpecification(RKMETableSpecification):
             return np.array(miniLM_learnware.predict(X))
 
         logger.info("Load the necessary feature extractor for RKMETextSpecification.")
+        
+        try:
+            from sentence_transformers import SentenceTransformer
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(f"RKMETextSpecification is not available because 'sentence_transformers' is not installed! Please install it manually.")
+           
         if os.path.exists(zip_path):
             X = _get_from_client(zip_path, X)
         else:
diff --git a/learnware/specification/regular/text/utils.py b/learnware/specification/regular/text/utils.py
deleted file mode 100644
index d4568a5..0000000
--- a/learnware/specification/regular/text/utils.py
+++ /dev/null
@@ -1,15 +0,0 @@
-from ....logger import get_module_logger
-
-logger = get_module_logger("regular_text_spec_utils")
-
-
-def is_sentence_transformers_available(verbose=False):
-    try:
-        import sentence_transformers
-    except ModuleNotFoundError as err:
-        if verbose is True:
-            logger.warning(
-                "ModuleNotFoundError: sentence_transformers is not installed, please install sentence_transformers!"
-            )
-        return False
-    return True
diff --git a/learnware/specification/system/__init__.py b/learnware/specification/system/__init__.py
index 82fbe3f..45be6cc 100644
--- a/learnware/specification/system/__init__.py
+++ b/learnware/specification/system/__init__.py
@@ -6,6 +6,6 @@ logger = get_module_logger("system_spec")
 
 if not is_torch_available(verbose=False):
     HeteroMapTableSpecification = None
-    logger.warning("HeteroMapTableSpecification is skipped because torch is not installed!")
+    logger.error("HeteroMapTableSpecification is not available because 'torch' is not installed!")
 else:
     from .hetero_table import HeteroMapTableSpecification