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// TODO(rays) BlobToTrainingSample must remain a global function until
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// the FlexFx and FeatureDescription code can be removed and LearnBlob
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// made a member of Classify.
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const TBLOB& blob, bool nonlinear_norm, INT_FX_RESULT_STRUCT* fx_info,
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// Deprecated! Prefer tesseract::Classify::ExtractFeatures instead.