Estimated intrinsic dimensionality via the TWO-NN estimator.
A value much lower than dimensions suggests the embedding space is
under-utilised for this corpus.
Fraction of embeddings whose L2-norm z-score exceeds 2.5. Non-zero values may indicate degenerate or truncated inputs.
Mean cosine similarity between randomly sampled pairs of embeddings. Should be close to 0 for a well-spread embedding space.