fix bug in pls

metbit/pls.py

@@ -36,7 +36,7 @@ def fit(self, x: np.ndarray, y: np.ndarray,
         PLS object
 
         """
-
+        from .base import nipals
         import numpy as np
         n, r = x.shape
         # preallocation

setup.py

@@ -12,13 +12,13 @@
 setup(
   name = 'metbit',      
   packages = ['metbit'], 
-  version = '5.3.5',  
+  version = '5.3.6',  
   license='MIT', 
   description = 'Metabolomics data analysis and visualization tools.',
   author = 'aeiwz',                 
   author_email = '[email protected]',   
   url = 'https://github.com/aeiwz/metbit.git',  
-  download_url = 'https://github.com/aeiwz/metbit/archive/refs/tags/V5.3.5.tar.gz',  
+  download_url = 'https://github.com/aeiwz/metbit/archive/refs/tags/V5.3.6.tar.gz',  
   keywords = ['Omics', 'Multivariate analysis', 'Visualization', 'Data Analysis', 'Metabolomics', 'Chemometrics'],
   install_requires=[            
           'scikit-learn',