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mtmd: fix gemma 4 audio rms norm eps (#23815)

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* mtmd: fix gemma 4 audio rms norm eps

* Update tools/mtmd/clip.cpp

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

---------

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
This commit is contained in:
Xuan-Son Nguyen 2026-05-28 16:31:37 +02:00 • committed by GitHub
parent dd1557907a
commit d6be3158e1
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2 changed files with 9 additions and 5 deletions
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11
conversion/gemma.py
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@ -786,14 +786,15 @@ class Gemma4VisionAudioModel(MmprojModel):
super().set_gguf_parameters()
# vision params
assert self.hparams_vision is not None
self.gguf_writer.add_clip_vision_projector_type(gguf.VisionProjectorType.GEMMA4V)
self.gguf_writer.add_vision_attention_layernorm_eps(self.hparams.get("layer_norm_eps", 1e-6))
self.gguf_writer.add_vision_attention_layernorm_eps(self.hparams_vision.get("layer_norm_eps", 1e-6))
# audio params
if self.hparams_audio:
self.gguf_writer.add_clip_audio_projector_type(gguf.VisionProjectorType.GEMMA4A)
self.gguf_writer.add_audio_num_mel_bins(self.hparams_audio["feat_in"])
self.gguf_writer.add_audio_attention_layernorm_eps(1e-5)
assert self.hparams_audio is not None
self.gguf_writer.add_clip_audio_projector_type(gguf.VisionProjectorType.GEMMA4A)
self.gguf_writer.add_audio_num_mel_bins(self.hparams_audio["feat_in"])
self.gguf_writer.add_audio_attention_layernorm_eps(self.hparams_audio.get("layer_norm_eps", 1e-6))
def is_audio_tensor(self, name: str) -> bool:
return "audio_tower" in name or "embed_audio" in name

3
tools/mtmd/clip.cpp
View file

@ -1552,6 +1552,9 @@ struct clip_model_loader {
hparams.audio_n_fft = 512;
hparams.audio_window_len = 320; // 20ms frame (NOT 25ms/400)
hparams.audio_hop_len = 160;
// due to a mistake in the original conversion code, rms_norm_eps is set to a wrong value
// since all gemma4a models use 1e-6, we just hardcode it here to avoid re-conversion
hparams.eps = 1e-6f;
} break;
case PROJECTOR_TYPE_GRANITE_SPEECH:
{