fix idkc

Author: xhan97

ikpykit/cluster/_idkc.py

@@ -238,6 +238,7 @@ def _initialize_cluster(self, X):
         else:
             init_center = self.init_center
         for i in range(self.k):
+            self.clusters_[i].set_center(init_center[i])
             self.clusters_[i].add_points(init_center[i], X[init_center[i]])
         self.data_index = np.delete(self.data_index, init_center)
         return self

ikpykit/cluster/_kcluster.py

@@ -9,6 +9,7 @@
 """
 
 from collections.abc import Iterable
+from numbers import Integral
 
 import numpy as np
 from scipy import sparse as sp
@@ -27,18 +28,14 @@ def set_center(self, center):
 
     def add_points(self, ids, X):
         self.increment_kernel_mean_(X)
-        if isinstance(ids, np.integer):
-            if self.center is None:
-                self.center = ids
+        if isinstance(ids, Integral):
             self.points_.append(ids)
         elif isinstance(ids, Iterable):
-            if self.center is None:
-                raise ValueError("Cluster is not initialized.")
             self.points_.extend(ids)
 
     def delete_points(self, points, X):
         self.reduce_kernel_mean_(X)
-        if isinstance(points, np.integer):
+        if isinstance(points, Integral):
             try:
                 self.points_.remove(points)
             except: