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[imago.git] / imago_pack / k_means.py

diff --git a/imago_pack/k_means.py b/imago_pack/k_means.py
index 0019597..c5ddba5 100644 (file)
--- a/imago_pack/k_means.py
+++ b/imago_pack/k_means.py
@@ -1,8 +1,9 @@
-"""K-means module"""
+"""K-means module."""
 
 import random
 
 def cluster(k, d, data, i_centers=None):
+    """Find *k* clusters on *d* dimensional *data*."""
     borders = [(min(p[0][i] for p in data), max(p[0][i] for p in data))
                for i in range(d) ]
     if i_centers:
@@ -39,5 +40,5 @@ def centroid(cluster):
     return [sum(c[0][i] for c in cluster) / l for i in range(d)]
 
 def delta(c1, c2):
-    return sum( (sum(abs(cc1 - cc2) for (cc1, cc2) in zip (ccc1, ccc2)) if ccc2
+    return sum((sum(abs(cc1 - cc2) for (cc1, cc2) in zip (ccc1, ccc2)) if ccc2
                else 0.) for (ccc1, ccc2) in zip(c1, c2))