[Retracted] The Application of Successful Physical Education Teaching Mode Integrating Deep Learning in Basketball Teaching

Table 2

Feature selection methods.

Method	Concept	Instructions
Eigenfrequency	The total number of times the feature appears in the text	Take a certain value as the reference point, remove the features whose feature frequency is not higher than the reference point in the original feature set, and retain the features whose feature frequency is higher than the reference point.
Document frequency	The number of samples in which a characteristic appears	Remove features with low document frequency
Information gain	The probability of some feature in the sample	Probability calculation using text and text features
Mutual information	Reflect the existence of features and categories relationship	Set a threshold, remove the features below this threshold from the original features, and use the remaining features as the features represented by the document
Chi-square statistics	Measure how related a feature is to a category	Set a threshold, remove the features below this threshold from the original features, and use the remaining features as the features represented by the document