Frozen Mamba patch-boundary readouts do not outperform mean pooling for sentence representations on SST-2, CoLA, MRPC, STS-B, and IMDb due to anisotropy (cosine similarity ~0.9999) and representational collapse (MCC=0 on CoLA).
How contextual are contextualized word representations? Comparing the geometry of
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Lost in State Space: Probing Frozen Mamba Representations
Frozen Mamba patch-boundary readouts do not outperform mean pooling for sentence representations on SST-2, CoLA, MRPC, STS-B, and IMDb due to anisotropy (cosine similarity ~0.9999) and representational collapse (MCC=0 on CoLA).