convert: slice gate_up weight

convert/convert_gptoss.go

@@ -108,17 +108,26 @@ func (m *gptossModel) Tensors(ts []Tensor) []*ggml.Tensor {
 
 	for name, mxfp4 := range mxfp4s {
 		dims := mxfp4.blocks.Shape()
-
+		if strings.Contains(name, "ffn_down_exps") {
-		if !strings.HasSuffix(name, ".weight") {
+			out = append(out, &ggml.Tensor{
-			name += ".weight"
+				Name:     name + ".weight",
+				Kind:     uint32(ggml.TensorTypeMXFP4),
+				Shape:    []uint64{dims[0], dims[1], dims[2] * dims[3] * 2},
+				WriterTo: mxfp4,
+			})
+		} else if strings.Contains(name, "ffn_gate_up_exps") {
+			out = append(out, &ggml.Tensor{
+				Name:     strings.Replace(name, "gate_up", "gate", 1) + ".weight",
+				Kind:     uint32(ggml.TensorTypeMXFP4),
+				Shape:    []uint64{dims[0], dims[1] / 2, dims[2] * dims[3] * 2},
+				WriterTo: mxfp4.slice(1, 0, int(dims[1]), 2),
+			}, &ggml.Tensor{
+				Name:     strings.Replace(name, "gate_up", "up", 1) + ".weight",
+				Kind:     uint32(ggml.TensorTypeMXFP4),
+				Shape:    []uint64{dims[0], dims[1] / 2, dims[2] * dims[3] * 2},
+				WriterTo: mxfp4.slice(1, 1, int(dims[1]), 2),
+			})
 		}
-
-		out = append(out, &ggml.Tensor{
-			Name:     name,
-			Kind:     uint32(ggml.TensorTypeMXFP4),
-			Shape:    []uint64{dims[0], dims[1], dims[2] * dims[3] * 2},
-			WriterTo: mxfp4,
-		})
 	}
 
 	return out
@@ -169,9 +178,21 @@ func (m *gptossModel) Replacements() []string {
 }
 
 type mxfp4 struct {
+	slices []tensor.Slice
+
 	blocks, scales Tensor
 }
 
+func (m *mxfp4) slice(dim, start, end, step int) *mxfp4 {
+	slice := slices.Repeat([]tensor.Slice{nil}, len(m.blocks.Shape()))
+	slice[dim] = tensor.S(start, end, step)
+	return &mxfp4{
+		slices: slice,
+		blocks: m.blocks,
+		scales: m.scales,
+	}
+}
+
 func (m *mxfp4) WriteTo(w io.Writer) (int64, error) {
 	var b bytes.Buffer
 	if _, err := m.blocks.WriteTo(&b); err != nil {
@@ -215,6 +236,13 @@ func (m *mxfp4) WriteTo(w io.Writer) (int64, error) {
 		return 0, err
 	}
 
+	if len(m.slices) > 0 {
+		out, err = out.Slice(m.slices...)
+		if err != nil {
+			return 0, err
+		}
+	}
+
 	out = tensor.Materialize(out)
 
 	if err := out.Reshape(out.Shape().TotalSize()); err != nil {