DryAllowedLength

DryAllowedLength is the minimum consecutive-token match length before the DRY penalty starts firing. Matches up to this length pass without penalty; longer matches get the exponentially growing DRY penalty.

Quick reference


Type	`int`
Default	`2`
Range	`1` and above
Category	Phrase-level repetition penalty
Field on	`SamplerParameters.DryAllowedLength`

What it does

DRY scans recent generation for consecutive-token sequences that match earlier content. Matches strictly longer than DryAllowedLength trigger the penalty, which grows by DryBase for each token beyond the threshold:

penalty_factor = DryMultiplier × DryBase^(match_length - DryAllowedLength)

DryAllowedLength = 2 (default) — any 3+ token repeat gets penalized. Catches most phrase repeats while allowing natural short patterns.
DryAllowedLength = 3 — allows short 3-token patterns to repeat unpenalized. Safer for code / formatted output.
DryAllowedLength = 5 — only long repeats are penalized. Use when the default causes awkward word choices.
DryAllowedLength = 1 — very aggressive; any 2-token match penalized.

When to change it

Scenario	Value
Default	`2`
Code or formatted output with natural repeats	`4` – `6`
Model loops even on short phrases	`1` – `2`
Balanced creative writing	`3`

DryAllowedLength is the best knob to tune when DRY starts producing strange word choices — raise it so DRY leaves short natural patterns alone.

Example

var preset = new Qwen25Preset();
preset.SamplerParameters.DryMultiplier = 0.8f;
preset.SamplerParameters.DryAllowedLength = 4;  // allow short repeats

using var api = AsposeLLMApi.Create(preset);

Interactions

DryMultiplier — must be positive for DRY to be active.
DryBase — sets how fast penalty grows beyond this length.
DrySequenceBreakers — tokens that reset the match counter.

What’s next

DryMultiplier — enables DRY.
DryBase — growth rate past this length.
Sampler parameters hub — all sampler knobs.

DryBase DryPenaltyLastN