1gpu-llm-small-en-it-base-v2 / report_small_v2_decoding_grid.md
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GPT2-small decoding-grid comparison: step_8600 vs step_18000 vs step_18800

Date: 2026-07-03

Scope

This note compares the completed GPU decoding-grid artifacts for:

  • step_8600
  • step_18000
  • step_18800

The comparison focuses on:

  • Italian behavior
  • loop / repetition resistance
  • cloze / factual prompts
  • free EN / IT prompts

The tuning split is the main grid-selection signal. The holdout split is a confirmation check.

Executive reading

  • Checkpoint-level verdict: step_18800 remains the benchmark / loss winner.
  • Preset-level verdict: step_18000 + anti_loop is the strongest overall decoding-grid pairing once tuning and holdout are both considered.
  • Why that split matters: the raw tuning winner is step_18800 + anti_loop, but the raw holdout winner is step_18000 + anti_loop, and the average of the two split scores favors step_18000 + anti_loop.

Score table

Checkpoint Tuning winner Tuning score Holdout winner Holdout score Tuning+holdout avg Read
step_8600 balanced 2.789 balanced 3.188 2.989 stable, but weakest overall
step_18000 creative 3.370 anti_loop 3.927 3.496 best combined grid result
step_18800 anti_loop 3.034 anti_loop 3.210 3.122 consistent, but below step_18000 on the combined read

Category notes

Italian behavior

  • step_8600 is the weakest on Italian factual prompts, but it still occasionally lands the right answer under balanced.
  • step_18000 improves English factual completion materially and keeps Italian free-form output coherent, but it still misses the Italian cloze answer in the best zero-loop setting.
  • step_18800 is the most visibly polished in style, but it regresses on the Italian cloze prompt: it keeps drifting into the wrong factual chain instead of producing Roma.

Loop / repetition

  • greedy is unusable on all three checkpoints.
  • anti_loop is the only preset that is consistently safe on repetition across the sweep.
  • step_18000 + anti_loop is the best compromise: no loops on either split and the strongest combined score.
  • step_8600 is the most repetition-sensitive checkpoint overall.

Cloze / factual prompts

  • On the English cloze prompt, step_18000 is the strongest of the three checkpoints.
  • On the Italian cloze prompt, none of the checkpoints is fully reliable, but step_18800 is the most obviously wrong because it settles into the wrong entity chain rather than a near-miss.
  • The factual prompts are the clearest place where benchmark loss and decode quality diverge: step_18800 still wins on loss, but it does not produce the best factual decoding behavior.

Free EN / IT prompts

  • All three checkpoints mostly preserve language identity on the free-form prompts.
  • The main distinction is robustness:
    • step_8600 is coherent but bland and more repetition-prone.
    • step_18000 + anti_loop is the cleanest balanced setting for free EN / IT generation.
    • step_18800 reads smoother, but its factual slips keep it from being the best overall operational choice.

Tuning / holdout mismatch

  • step_8600 is internally stable: tuning and holdout both prefer balanced.
  • step_18000 is the clearest mismatch: tuning prefers creative, holdout prefers anti_loop.
  • step_18800 is internally consistent on the best preset (anti_loop), but the checkpoint still underperforms step_18000 + anti_loop on the combined read.

Bottom line

  • Checkpoint winner: step_18800
  • Best decoding-grid pairing: step_18000 + anti_loop
  • Main tradeoff: step_18800 is the best loss checkpoint, but step_18000 + anti_loop is the safer decode choice for Italian + free-form usage in this sweep.