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Implemented LogitBias for DefaultSamplingPipeline #986

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Nov 15, 2024
Merged

Implemented LogitBias for DefaultSamplingPipeline #986

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22 changes: 22 additions & 0 deletions LLama/Sampling/DefaultSamplingPipeline.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,28 @@ protected override SafeLLamaSamplerChainHandle CreateChain(SafeLLamaContextHandl
{
var chain = SafeLLamaSamplerChainHandle.Create(LLamaSamplerChainParams.Default());

// Rent a temporary array and copy the biases into it
var biases = ArrayPool<LLamaLogitBias>.Shared.Rent(LogitBias.Count);
try
{
var index = 0;
foreach (var bias in LogitBias)
{
biases[index++] = new LLamaLogitBias
{
Token = bias.Key,
Bias = bias.Value
};
}

// Add the biases to the sampler
chain.AddLogitBias(context.ModelHandle.VocabCount, biases.AsSpan(0, LogitBias.Count));
}
finally
{
ArrayPool<LLamaLogitBias>.Shared.Return(biases);
}

if (Grammar != null)
chain.AddGrammar(context.ModelHandle, Grammar.Gbnf, Grammar.Root);

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