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Add Virchow-SPECTRA encoder - #19
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PaulScotti
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October 24, 2026 16:48
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Adds Virchow-SPECTRA from MedARC and Sophont as
virchow_spectra.Loads the complete merged weights with the model card's preprocessing. Classification uses 2,560-dimensional concatenated CLS and mean-pooled patch features; segmentation uses 1,280-dimensional patch features, excluding the CLS token.
Evaluate with the standard THUNDER workflow:
Validated the released checkpoint offline in FP32 with timm 1.0.20: preprocessing, pooled and dense embeddings, and nonzero input gradients.