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Answers for “为什么在机器学习中需要数据归一化?”

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Understand why

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In machine learning, normalization is used to scale different features to the same scale, preventing features with larger numerical values from dominating model training and thus avoiding inconsistency. If features differ greatly in magnitude, the algorithm may become biased.

Conditions: Suitable for datasets where features differ greatly in units or magnitude

Meet the concept

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The primary goal of normalization is to bring all the features of a dataset to a similar scale, typically between 0 and 1. This helps in comparing different features on a uniform basis and prevents features with larger numerical values from dominating the model training process.

Conditions: Used when dataset features have varying values.; Goal is to bring features to a similar scale.

Find a method

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To standardize a dataset using the Z-score formula, first compute the mean (μ\mu) and standard deviation (σ\sigma) of the dataset. Then, for each original data value XX, apply the formula X′=X−μσX' = \frac{X - \mu}{\sigma} to convert it into a standardized score.

Conditions: Requires knowing the mean and standard deviation of the dataset