5,321
edits
Unsupervised Learning: Difference between revisions
→Optimization
| Line 31: | Line 31: | ||
</math><br> | </math><br> | ||
<math> | <math> | ||
= \sum_{j=1}^{k} \sum_{i\mid z(i)=j} 2(x^{(i)} - \mu_{j}) | = -\sum_{j=1}^{k} \sum_{i\mid z(i)=j} 2(x^{(i)} - \mu_{j}) = 0 | ||
</math><br> | </math><br> | ||
<math> | <math> | ||