diff --git a/Makefile b/Makefile
index c2fbf9c..1097f65 100644
--- a/Makefile
+++ b/Makefile
@@ -33,6 +33,7 @@ clean-build: ## remove build artifacts
 	rm -fr .eggs/
 	find . -name '*.egg-info' -exec rm -fr {} +
 	find . -name '*.egg' -exec rm -f {} +
+	find . -name '*.so' -exec rm -f {} +
 
 clean-pyc: ## remove Python file artifacts
 	find . -name '*.pyc' -exec rm -f {} +
diff --git a/mlsauce.egg-info/PKG-INFO b/mlsauce.egg-info/PKG-INFO
deleted file mode 100644
index 2ed7c37..0000000
--- a/mlsauce.egg-info/PKG-INFO
+++ /dev/null
@@ -1,36 +0,0 @@
-Metadata-Version: 2.1
-Name: mlsauce
-Version: 0.15.1
-Summary: Miscellaneous Statistical/Machine Learning tools
-Maintainer: T. Moudiki
-Maintainer-email: thierry.moudiki@gmail.com
-License: BSD3 Clause Clear
-Platform: linux
-Platform: macosx
-Platform: windows
-Classifier: Development Status :: 2 - Pre-Alpha
-Classifier: Intended Audience :: Developers
-Classifier: License :: OSI Approved :: BSD License
-Classifier: Natural Language :: English
-Classifier: Programming Language :: Python :: 3
-Classifier: Programming Language :: Python :: 3.5
-Classifier: Programming Language :: Python :: 3.6
-Classifier: Programming Language :: Python :: 3.7
-Classifier: Programming Language :: Python :: 3.8
-Requires-Python: >=3.5
-License-File: LICENSE
-Requires-Dist: numpy
-Requires-Dist: Cython
-Requires-Dist: joblib
-Requires-Dist: pandas
-Requires-Dist: requests
-Requires-Dist: scikit-learn
-Requires-Dist: scipy
-Requires-Dist: tqdm
-Requires-Dist: jax
-Requires-Dist: jaxlib
-Provides-Extra: alldeps
-Requires-Dist: numpy>=1.13.0; extra == "alldeps"
-Requires-Dist: scipy>=0.19.0; extra == "alldeps"
-
-Miscellaneous Statistical/Machine Learning tools
diff --git a/mlsauce.egg-info/SOURCES.txt b/mlsauce.egg-info/SOURCES.txt
deleted file mode 100644
index 66e2723..0000000
--- a/mlsauce.egg-info/SOURCES.txt
+++ /dev/null
@@ -1,64 +0,0 @@
-LICENSE
-README.md
-setup.cfg
-setup.py
-mlsauce/__init__.py
-mlsauce/_config.py
-mlsauce/setup.py
-mlsauce.egg-info/PKG-INFO
-mlsauce.egg-info/SOURCES.txt
-mlsauce.egg-info/dependency_links.txt
-mlsauce.egg-info/not-zip-safe
-mlsauce.egg-info/requires.txt
-mlsauce.egg-info/top_level.txt
-mlsauce/adaopt/__init__.py
-mlsauce/adaopt/_adaopt.py
-mlsauce/adaopt/_adaoptc.c
-mlsauce/adaopt/fallbacksetup.py
-mlsauce/adaopt/setup.py
-mlsauce/booster/__init__.py
-mlsauce/booster/_booster_classifier.py
-mlsauce/booster/_booster_regressor.py
-mlsauce/booster/_boosterc.c
-mlsauce/booster/fallbacksetup.py
-mlsauce/booster/setup.py
-mlsauce/datasets/__init__.py
-mlsauce/datasets/dowload.py
-mlsauce/encoders/__init__.py
-mlsauce/encoders/target_encoders.py
-mlsauce/lasso/__init__.py
-mlsauce/lasso/_lasso.py
-mlsauce/lasso/_lassoc.c
-mlsauce/lasso/fallbacksetup.py
-mlsauce/lasso/setup.py
-mlsauce/nonconformist/__init__.py
-mlsauce/nonconformist/acp.py
-mlsauce/nonconformist/base.py
-mlsauce/nonconformist/cp.py
-mlsauce/nonconformist/evaluation.py
-mlsauce/nonconformist/icp.py
-mlsauce/nonconformist/nc.py
-mlsauce/nonconformist/util.py
-mlsauce/predictioninterval/__init__.py
-mlsauce/predictioninterval/predictioninterval.py
-mlsauce/ridge/__init__.py
-mlsauce/ridge/_ridge.py
-mlsauce/ridge/_ridgec.c
-mlsauce/ridge/fallbacksetup.py
-mlsauce/ridge/setup.py
-mlsauce/stump/__init__.py
-mlsauce/stump/_stump_classifier.py
-mlsauce/stump/_stumpc.c
-mlsauce/stump/fallbacksetup.py
-mlsauce/stump/setup.py
-mlsauce/tests/__init__.py
-mlsauce/tests/test_adaopt.py
-mlsauce/utils/__init__.py
-mlsauce/utils/get_beta.py
-mlsauce/utils/progress_bar.py
-mlsauce/utils/memoryuse/__init__.py
-mlsauce/utils/memoryuse/mem_usage.py
-mlsauce/utils/misc/__init__.py
-mlsauce/utils/misc/misc.py
-mlsauce/utils/sampling/__init__.py
-mlsauce/utils/sampling/rowsubsampling.py
\ No newline at end of file
diff --git a/mlsauce.egg-info/dependency_links.txt b/mlsauce.egg-info/dependency_links.txt
deleted file mode 100644
index 8b13789..0000000
--- a/mlsauce.egg-info/dependency_links.txt
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/mlsauce.egg-info/not-zip-safe b/mlsauce.egg-info/not-zip-safe
deleted file mode 100644
index 8b13789..0000000
--- a/mlsauce.egg-info/not-zip-safe
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/mlsauce.egg-info/requires.txt b/mlsauce.egg-info/requires.txt
deleted file mode 100644
index b3f1862..0000000
--- a/mlsauce.egg-info/requires.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-numpy
-Cython
-joblib
-pandas
-requests
-scikit-learn
-scipy
-tqdm
-jax
-jaxlib
-
-[alldeps]
-numpy>=1.13.0
-scipy>=0.19.0
diff --git a/mlsauce.egg-info/top_level.txt b/mlsauce.egg-info/top_level.txt
deleted file mode 100644
index 2ccd09c..0000000
--- a/mlsauce.egg-info/top_level.txt
+++ /dev/null
@@ -1 +0,0 @@
-mlsauce
diff --git a/mlsauce/adaopt/_adaopt.py b/mlsauce/adaopt/_adaopt.py
index d113ed5..6f5b45b 100644
--- a/mlsauce/adaopt/_adaopt.py
+++ b/mlsauce/adaopt/_adaopt.py
@@ -1,3 +1,4 @@
+import os 
 import pickle
 import numpy as np
 import pandas as pd
@@ -13,15 +14,11 @@
 from ..utils import cythonize_file 
 
 try:
-    from . import _adaoptc as adaoptc
-except ModuleNotFoundError:
-    try: 
-        cythonize_file("./_adaoptc.pyx")        
-        import _adaoptc
-    except ModuleNotFoundError: 
-        subprocess.run(['python3', './fallbacksetup.py', 'build_ext', '--inplace'])    
-        import _adaoptc
-
+    from . import _adaoptc as adaoptc        
+except ImportError:
+    import pyximport; pyximport.install()
+    import _adaoptc    
+        
 
 class AdaOpt(BaseEstimator, ClassifierMixin):
     """AdaOpt classifier.
diff --git a/mlsauce/booster/_booster_classifier.py b/mlsauce/booster/_booster_classifier.py
index e526181..3fdc712 100644
--- a/mlsauce/booster/_booster_classifier.py
+++ b/mlsauce/booster/_booster_classifier.py
@@ -12,12 +12,8 @@
 try:
     from . import _boosterc as boosterc
 except ModuleNotFoundError:
-    try: 
-        cythonize_file("./_boosterc.pyx")        
-        import _boosterc
-    except ModuleNotFoundError: 
-        subprocess.run(['python3', './fallbacksetup.py', 'build_ext', '--inplace'])    
-        import _boosterc
+    import pyximport; pyximport.install()
+    import _boosterc
 
 
 class LSBoostClassifier(BaseEstimator, ClassifierMixin):
diff --git a/mlsauce/booster/_booster_regressor.py b/mlsauce/booster/_booster_regressor.py
index 91a023a..328b9e2 100644
--- a/mlsauce/booster/_booster_regressor.py
+++ b/mlsauce/booster/_booster_regressor.py
@@ -12,12 +12,8 @@
 try:
     from . import _boosterc as boosterc
 except ModuleNotFoundError:
-    try: 
-        cythonize_file("./_boosterc.pyx")        
-        import _boosterc
-    except ModuleNotFoundError: 
-        subprocess.run(['python3', './fallbacksetup.py', 'build_ext', '--inplace'])    
-        import _boosterc
+    import pyximport; pyximport.install()
+    import _boosterc
 
 class LSBoostRegressor(BaseEstimator, RegressorMixin):
     """LSBoost regressor.
diff --git a/mlsauce/booster/fallbacksetup.py b/mlsauce/booster/fallbacksetup.py
index 5bcdc84..e3e5c8c 100644
--- a/mlsauce/booster/fallbacksetup.py
+++ b/mlsauce/booster/fallbacksetup.py
@@ -4,5 +4,5 @@
 
 dir_path = os.path.dirname(os.path.realpath(__file__))
 
-setup(ext_modules=cythonize(os.path.join(dir_path, "_stumpc.pyx"), 
+setup(ext_modules=cythonize(os.path.join(dir_path, "_boosterc.pyx"), 
                             compiler_directives={'language_level' : "3"}))
\ No newline at end of file
diff --git a/mlsauce/lasso/_lasso.py b/mlsauce/lasso/_lasso.py
index 35da544..766de27 100644
--- a/mlsauce/lasso/_lasso.py
+++ b/mlsauce/lasso/_lasso.py
@@ -17,12 +17,8 @@
 try:
     from . import _lassoc as mo
 except ModuleNotFoundError:
-    try: 
-        cythonize_file("./_lassoc.pyx")        
-        import _lassoc
-    except ModuleNotFoundError: 
-        subprocess.run(['python3', './fallbacksetup.py', 'build_ext', '--inplace'])    
-        import _lassoc
+    import pyximport; pyximport.install()
+    import _lassoc
 
 
 class LassoRegressor(BaseEstimator, RegressorMixin):
diff --git a/mlsauce/ridge/_ridge.py b/mlsauce/ridge/_ridge.py
index 8238a42..cc6eaa8 100644
--- a/mlsauce/ridge/_ridge.py
+++ b/mlsauce/ridge/_ridge.py
@@ -16,12 +16,8 @@
 try:
     from . import _ridgec as mo
 except ModuleNotFoundError:
-    try: 
-        cythonize_file("./_ridgec.pyx")        
-        import _ridgec
-    except ModuleNotFoundError: 
-        subprocess.run(['python3', './fallbacksetup.py', 'build_ext', '--inplace'])    
-        import _ridgec
+    import pyximport; pyximport.install()
+    import _ridgec
 
 
 class RidgeRegressor(BaseEstimator, RegressorMixin):
diff --git a/mlsauce/stump/_stump_classifier.py b/mlsauce/stump/_stump_classifier.py
index 77bec40..6850ba5 100644
--- a/mlsauce/stump/_stump_classifier.py
+++ b/mlsauce/stump/_stump_classifier.py
@@ -7,12 +7,8 @@
 try:
     from . import _stumpc as stumpc
 except ModuleNotFoundError:
-    try: 
-        cythonize_file("./_stumpc.pyx")        
-        import _stumpc
-    except ModuleNotFoundError: 
-        subprocess.run(['python3', './fallbacksetup.py', 'build_ext', '--inplace'])    
-        import _stumpc
+    import pyximport; pyximport.install()
+    import _stumpc
 
 
 class StumpClassifier(BaseEstimator, ClassifierMixin):
diff --git a/setup.py b/setup.py
index e3c1a19..3418e71 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@
 MAINTAINER_EMAIL = 'thierry.moudiki@gmail.com'
 LICENSE = 'BSD3 Clause Clear'
 
-__version__ = '0.15.3'
+__version__ = '0.15.4'
 
 VERSION = __version__
 
@@ -200,4 +200,18 @@ def setup_package():
     setup(**metadata)
 
 if __name__ == "__main__":
-    setup_package()
\ No newline at end of file
+
+    # /!\ do not change the order of execution of the following commands 
+
+    setup_package()
+    
+    dir_path = os.path.dirname(os.path.realpath(__file__))
+    folders = ['adaopt', 'booster', 'lasso', 'ridge', 'stump']
+
+    for folder in folders: 
+
+        filename = os.path.join(dir_path, "mlsauce", folder, 'fallbacksetup.py')
+        
+        print(f"\n\n Running command: {filename} \n\n")
+
+        subprocess.run(['python3', filename, 'build_ext', '--inplace'])        
\ No newline at end of file