Feature extraction from raw data.
User guide. See the Feature extraction section for further details.
Transforms lists of feature-value mappings to vectors.
Implements feature hashing, aka the hashing trick.
From images#Utilities to extract features from images.
Extracts patches from a collection of images.
Reshape a 2D image into a collection of patches.
Graph of the pixel-to-pixel connections.
Graph of the pixel-to-pixel gradient connections.
image.reconstruct_from_patches_2d
Reconstruct the image from all of its patches.
From text#Utilities to build feature vectors from text documents.
Convert a collection of text documents to a matrix of token counts.
Convert a collection of text documents to a matrix of token occurrences.
Transform a count matrix to a normalized tf or tf-idf representation.
Convert a collection of raw documents to a matrix of TF-IDF features.
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