Round 37 S3 — Guard-Clear Cosine Statistics (P2.2)
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exact_autograd   (n≤10K, guard_clear)
  mean cosine = 0.9289  min cosine = -0.0065  n_cells = 32
analytical_large_n (10K<n≤30K, guard_clear)
  mean cosine = 0.9086  min cosine = 0.5852  n_cells = 19
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