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# Feature Extractor

Feature Extractor负责为音频或视觉模型准备输入特征。这包括从序列中提取特征，例如，对音频文件进行预处理以生成Log-Mel频谱特征，以及从图像中提取特征，例如，裁剪图像文件，同时还包括填充、归一化和转换为NumPy、PyTorch和TensorFlow张量。


## FeatureExtractionMixin

[[autodoc]] feature_extraction_utils.FeatureExtractionMixin
    - from_pretrained
    - save_pretrained

## SequenceFeatureExtractor

[[autodoc]] SequenceFeatureExtractor
    - pad

## BatchFeature

[[autodoc]] BatchFeature

## ImageFeatureExtractionMixin

[[autodoc]] image_utils.ImageFeatureExtractionMixin