Variational Neurons in Transformers for Language Modeling

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• Variational neurons can be integrated stably into Transformer feed-forward computation while preserving the overall Transformer backbone.method 90%
  Evidencepartial

  Variational neurons integrate stably into Transformers, preserve strong predictive performance and produce informative uncertainty signals.

  Implicationpartial

  Explicitly stated in the abstract and conclusion as a main finding, with architectural details provided.

  Verificationpartial

  partial

• Transformers with variational neurons (EVE) achieve stronger predictive quality (lower CE, lower perplexity, higher accuracy) than deterministic baselines (DET) in matched settings.result 90%
  Evidencepartial

  EVE reaches CE=4.6572, perplexity=105.34, and accuracy=0.2402, whereas DET selects epoch 3 with CE=4.7795, perplexity=119.04, and accuracy=0.2264.

  Implicationpartial

  Direct numerical comparisons are provided in the results, showing clear advantages for EVE.

  Verificationpartial

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• Variational Transformers produce non-zero epistemic uncertainty signals (mutual information, conditional variance, Monte Carlo flip rate) while deterministic baselines produce near-zero signals.result 90%
  Evidencepartial

  EVE produces non-zero sampling-based epistemic signals, whereas the deterministic baseline remains degenerate on these quantities under repeated deterministic forward evaluation.

  Implicationpartial

  Explicitly stated with quantitative results showing EVE has non-zero values and DET has near-zero values for these metrics.

  Verificationpartial

  partial

• Variational Transformers show cleaner and more sustained learning dynamics (steady validation improvement) compared to deterministic baselines which peak early and then degrade.result 85%
  Evidencepartial

  Its final-validation CE improves steadily from 4.8864 to 4.6572 across the full 5-epoch run, while DET reaches its best point at epoch 3 and then rises to 4.8626 at epoch 4 and 5.0190 at epoch 5.

  Implicationpartial

  Direct comparison of learning curves is described, showing EVE improves steadily while DET peaks early and then rises.

  Verificationpartial

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• Task quality, useful depth, and internal stability are distinct properties that can be separated in variational Transformer evaluation.result 80%
  Evidencepartial

  The experiments also show that task quality, useful depth and internal stability are distinct properties.

  Implicationpartial

  Explicitly stated as a conclusion from the experiments, though the evidence for 'distinctness' is more interpretive.

  Verificationpartial

  partial

• Variational Transformers can achieve better tail-risk profile (lower CVaR-NLL) than deterministic baselines, even when the deterministic baseline has slightly better calibration (lower ECE).result 85%
  Evidencepartial

  DET achieves the lower ECE, 0.03546 versus 0.05110, while EVE achieves the lower CVaR-NLL, 11.8202 versus 12.1441.

  Implicationpartial

  Direct comparison shows EVE has lower CVaR-NLL (11.8202 vs 12.1441) while DET has lower ECE (0.03546 vs 0.05110).

  Verificationpartial

  partial

• The internal latent regime in some variational Transformer configurations can become substantially less controlled (high µ2 values) even while maintaining strong raw language modeling quality.limitation 80%
  Evidencepartial

  v23 provides the strongest raw CE/PPL point in this setting, while its internal latent regime remains substantially less controlled.

  Implicationpartial

  Specific example (v23) shows high µ2 values (550.82 in layer 3) despite strong CE/PPL performance.

  Verificationpartial

  partial

• Variational neurons based on EVE replace deterministic feed-forward units with local variational units that sample latent activations using a reparameterization trick.technical 90%
  Evidencepartial

  For neuron i, q(ℓ,i)ϕ (z(ℓ)i |u(ℓ),h (ℓ)i ) = N(µ(ℓ)q,i,diag((σ(ℓ)q,i )2)), ... and z(ℓ)i = µ(ℓ)q,i + σ(ℓ)q,i ⊙ ϵi, ϵ i ∼ N(0,I).

  Implicationpartial

  Technical details are explicitly provided in the architecture description.

  Verificationpartial

  partial

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