Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionLast revisionBoth sides next revision | ||
data_mining:regression [2014/07/13 03:36] – [Normalengleichungen] phreazer | data_mining:regression [2019/02/10 17:12] – [Cost function] phreazer | ||
---|---|---|---|
Line 17: | Line 17: | ||
==== Cost function ==== | ==== Cost function ==== | ||
- | + | $\displaystyle\min_{\theta_0, | |
- | $\text{minimize}_{\theta_0, | + | |
Vereinfachtes Problem: | Vereinfachtes Problem: | ||
- | $\text{minimize}_{\theta_0, | + | $\displaystyle\min_{\theta_0, |
$h_\theta(x^{(i)}) = \theta_0 +\theta_1x^{(i)}$ | $h_\theta(x^{(i)}) = \theta_0 +\theta_1x^{(i)}$ | ||
- | Cost function (Squared error cost function): | + | Cost function (Squared error cost function) |
$J(\theta_0, | $J(\theta_0, | ||
- | Goal: $\text{minimize}_{\theta_0, | + | Goal: $\displaystyle\min_{\theta_0, |
=== Functions (example with only $\theta_1$): | === Functions (example with only $\theta_1$): | ||
Line 120: | Line 119: | ||
**Gründe für Singularität: | **Gründe für Singularität: | ||
- | * Redundante | + | * Redundante |
- | * Zu viele Features (z.B. m <= n) | + | * Zu viele Features (z.B. $m <= n$) |
* Lösung: Features weglassen oder regularisieren | * Lösung: Features weglassen oder regularisieren | ||
- | |||
- | |||
- | |||
**Wann was benutzten? | **Wann was benutzten? |