Cross Validated Questions, Problems & Solutions : TransWikia.com ~ Page 39

Why does a class weight fraction improve precision compared to undersampling approach where precision drops?

I have an imbalanced data where the ratio between positive to negative samples is 1:3 (positive samples are 3 times higher than negative). For my case it is is important...

Asked on 11/12/2021

1 answer

Is it possible to implement an activation function or layer in Keras that uses two distinct sets of weights?

Is it possible to define a function or layer such that there exist two sets of weights and biases? For instance, where a normal sigmoidal activation function is 1/(1+e^-x), is...

Asked on 11/12/2021

1 answer

Expert Knowledge Acquisition and Machine learning

Having data sets regarding symptoms and diseases such that I use to observe the conditional distributions P(Disease X | Symptom A , Symptom H , Age >20 ) ...

Asked on 11/12/2021

1 answer

Improving F1 scores using models with good precision and recall

I have a highly imbalanced dataset (0.21 percent positives, rest negatives) for which I am trying to build a classifier. I tried to improve the F1 scores using hyperparameter tuning...

Asked on 11/12/2021

1 answer

Is ROCR applied to training data or testing data?

Is ROCR applied to training data or testing data? Why? Thank you,...

Asked on 11/12/2021 by fcas80

1 answer

Is the plot "White noise"?

To stabilize the time series named "walk" (it is daily data), I applied log transformation and trend is removed through differencing and plot looks stationary.Below the plot of acf...

Asked on 11/12/2021

0 answer

Multilabel Tweet Classification

I need some general advice and possible ideas. Problem statement goes like this --We are given a tweet and we have to specify associated labels for it like generalized...

Asked on 11/12/2021 by Vineet

0 answer

Propagating uncertainty through nested random forest models

Does anyone know if there are methods for propagating the prediction intervals (i.e. uncertainty) of nested surrogate models, specifically random forests? When I say nested, I mean that a second...

Asked on 11/12/2021

0 answer

Identify a contaminated distribution

I have a patchy time series of means, medians and sample sizes (n) that occasionally appears to be "contaminated" (either by bad or atypical data). For example:median<-c(605 598 600...

Asked on 11/12/2021 by Stephen Clark

1 answer

How do we generate the samples of hidden root nodes in the Bayes network (Sigmoid Belief Networks) of a generative model

Following is a Sigmoid Belief Networks where we can only observe the bottom observable layer $v.$ Usually we use Wake-Sleep to trainning the bottom-to-up Recognition Weight $r_{ji}$ and...

Asked on 11/12/2021 by user6703592

1 answer

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