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use fast attention

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This commit is contained in:
Michael Yang
2025-03-07 17:38:36 -08:00
parent 0e886595bf
commit 8934324b72
3 changed files with 8 additions and 14 deletions
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4
model/models/gemma3/model.go
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@@ -138,8 +138,8 @@ func (m *Model) PostTokenize(ctx ml.Context, inputs []input.Input) ([]input.Inpu
{Token: 255999}, // "<start_of_image>""
}
// <image_soft_token>
imageInputs = append(imageInputs, slices.Repeat([]input.Input{{Token: 262144}}, 256)...)
// pad inputs with placeholders for image embeddings
imageInputs = append(imageInputs, slices.Repeat([]input.Input{{Token: 0}}, 256)...)
// <end_of_image>
imageInputs = append(imageInputs, input.Input{Token: 256000})

14
model/models/gemma3/model_vision.go
View File

@@ -24,17 +24,11 @@ func (sa *VisionSelfAttention) Forward(ctx ml.Context, hiddenState ml.Tensor, op
key := sa.Key.Forward(ctx, hiddenState)
value := sa.Value.Forward(ctx, hiddenState)
query = query.Reshape(ctx, headDim, opts.numHeads, query.Dim(1), batchSize).Permute(ctx, 0, 2, 1, 3)
key = key.Reshape(ctx, headDim, opts.numHeads, key.Dim(1), batchSize).Permute(ctx, 0, 2, 1, 3)
value = value.Reshape(ctx, headDim, opts.numHeads, value.Dim(1), batchSize).Permute(ctx, 1, 2, 0, 3).Contiguous(ctx)
query = query.Reshape(ctx, headDim, opts.numHeads, query.Dim(1), batchSize)
key = key.Reshape(ctx, headDim, opts.numHeads, key.Dim(1), batchSize)
value = value.Reshape(ctx, headDim, opts.numHeads, value.Dim(1), batchSize)
scores := key.Mulmat(ctx, query)
scores = scores.Scale(ctx, 1.0/math.Sqrt(float64(headDim)))
scores = scores.Softmax(ctx)
attention := value.Mulmat(ctx, scores)
attention = attention.Reshape(ctx, headDim, attention.Dim(1), opts.numHeads, batchSize)
attention = attention.Permute(ctx, 0, 2, 1, 3).Contiguous(ctx)
attention := nn.Attention(ctx, query, key, value, 1.0/math.Sqrt(float64(headDim)), nil)
attention = attention.Reshape(ctx, opts.hiddenSize, attention.Dim(2), batchSize)
hiddenState = sa.Output.Forward(ctx, attention)