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convert : fix Granite Switch block_count for MultiSwitch checkpoints #30621

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Merged
CISC merged 2 commits into from
Oct 15, 2026
Merged

convert : fix Granite Switch block_count for MultiSwitch checkpoints #30621

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convert : fix Granite Switch block_count for MultiSwitch checkpoints
planetf1 Oct 15, 2026
0c771ac
Update granite.py
planetf1 Oct 15, 2026
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17 changes: 15 additions & 2 deletions conversion/granite.py
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Original file line number Diff line number Diff line change
Expand Up @@ -239,8 +239,21 @@ class GraniteSwitchModel(GraniteMoeModel):

def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# the weightless switch reserves one cache slot: one fewer block than num_hidden_layers
self.block_count = self.block_count - 1
# The weightless switch layer(s) are counted in num_hidden_layers but carry no tensors.
# The count is not fixed, nor is it present in hparams, so we derive it here based on tensor block names.
layer_ids = {
int(m.group(1))
for name in self.model_tensors
if (m := re.match(r"(?:model\.)?layers\.(\d+)\.", name))
}
if not layer_ids:
raise ValueError("graniteswitch: no 'model.layers.N' tensors found in checkpoint")
n_weight_layers = max(layer_ids) + 1
logger.info(
"gguf: (graniteswitch) num_hidden_layers %s counts %d weightless switch layer(s); using %d blocks",
self.hparams["num_hidden_layers"], self.block_count - n_weight_layers, n_weight_layers,
)
self.block_count = n_weight_layers
self.tensor_map = gguf.get_tensor_name_map(self.model_arch, self.block_count)

self._n_adapters = int(self.hparams["num_adapters"])
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