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Results tagged with machine-learning
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user 40036
Machine learning algorithms build a model of the training data. The term "machine learning" is vaguely defined; it includes what is also called statistical learning, reinforcement learning, unsupervised learning, etc. ALWAYS ADD A MORE SPECIFIC TAG.
2
votes
Accepted
How to use multilevel and hashed categorical variables to build an anomaly detection classifier
The core of your question seems to be whether a hash of an IP address can be used as a replacement for the IP address itself or if this will not perfectly differentiate the IP addresses (due to hash c …
- 4,389
2
votes
Accepted
How to find how which inputs correlate to output in XOR way
You have $n$ binary-valued independent variables and $m$ observations in a data matrix $X$ and your dependent variable $y$ is the XOR ($\oplus$) of some subset of the independent variables. Consider a …
- 4,389
23
votes
Accepted
Why f beta score define beta like that?
Letting $\beta$ be the weight in the first definition you provide and $\tilde\beta$ the weight in the second, the two definitions are equivalent when you set $\tilde\beta = \beta^2$, so these two defi …
- 4,389
3
votes
How to compare features and classifiers which achieve perfect accuracy?
There's value in simplicity. Let's assume your logistic regression model trained on feature 7 had intercept $a$ and coefficient $b$ for feature 7. This means the model predicts 1 whenever feature 7 ex …
- 4,389
9
votes
1
answer
3k
views
Variance-covariance matrix for ridge regression with stochastic $\lambda$
In ridge regression with design matrix $X$, outcomes $y$, fixed regularization parameter $\lambda$, and errors $\epsilon\sim\mathcal{N}(0, \sigma^2I)$, the computations for the ridge regression coeffi …
- 4,389
29
votes
For linear classifiers, do larger coefficients imply more important features?
Not at all. The magnitude of the coefficients depends directly on the scales selected for the variables, which is a somewhat arbitrary modeling decision.
To see this, consider a linear regression mod …
- 4,389