Extended fast feature selection for classification modeling
Bibliographic record
Abstract
The performance of a classification algorithm in data mining is greatly affected by the quality of data source. Irrelevant and redundant features of data not only increase the cost of mining process, but also degrade the quality of the result in some cases. This issue is particularly important to high-dimensional data, in that many features may either irrelevant or redundant for a selected classification target. Accordingly, feature selection becomes an essential part in data preparation. The feature selection for classification is to identify and remove irrelevant and redundant features, which do not contribute to modeling for a selected target. Among the existing feature selection methods, fast correlation-based filter and correlation-based feature selection are most commonly used approaches. The main concern of the these methods is that they may over simplify the features of a given data set by removing many useful features because of certain inherent limitation in these methods. As a result, the selected feature set may be over-simplified to be useful in practice. In this paper, we analyze the existing issue, and present an extended fast feature selection algorithm to overcome the problem. Experiments are conducted using real data from financial institutions to demonstrate the improvement in terms of quality of selected features. A result comparison between the proposed method and other three major methods is provided.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".