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Author SHA1 Message Date
Stephen Cox 547765a93e
mtmd: add Gemma 4 audio conformer encoder support (#21421) 
* mtmd: add Gemma 4 audio conformer encoder support

Add audio processing for Gemma 4 E2B/E4B via a USM-style Conformer.

Architecture:
- 12-layer Conformer: FFN → Self-Attention → Causal Conv1D → FFN → Norm
- Subsampling Conv Projection: 2x Conv2D(stride=2) with LayerNorm
- Full self-attention with sinusoidal RPE and sliding window mask (24)
- Logit softcapping at 50.0, ClippableLinear clamping
- Output: 1024 → 1536 → RMSNorm → multimodal embedder

Mel preprocessing (dedicated mtmd_audio_preprocessor_gemma4a):
- HTK mel scale, 128 bins, magnitude STFT, mel_floor=1e-3
- Standard periodic Hann window (320 samples), zero-padded to FFT size
- Semicausal left-padding (frame_length/2 samples)
- Frame count matched to PyTorch (unfold formula)
- No pre-emphasis, no Whisper-style normalization
- Mel cosine similarity vs PyTorch: 0.9998

Key fixes:
- Tensor loading dedup: prevent get_tensor() from creating duplicate
  entries in ctx_data. Fixed with std::set guard.
- ClippableLinear clamp_info loading moved after per-layer tensors.
- Sliding window mask (24 positions) matching PyTorch context_size.
- Skip Whisper normalization for Gemma4 mel output.

Tested on E2B and E4B with CPU and Vulkan backends.
Transcribes: "Glad to see things are going well and business is starting
to pick up" (matching ground truth).

Ref: #21325
 2026-04-12 14:15:26 +02:00
Xuan-Son Nguyen 871f1a2d2f
mtmd: add more sanity checks (#21047) 2026-03-27 11:00:52 +01:00
Tarek Dakhran ccbc84a537
mtmd: mtmd_audio_streaming_istft (#18645) 
Change is decoupled from https://github.com/ggml-org/llama.cpp/pull/18641.

[LFM2.5-Audio-1.5B](https://huggingface.co/LiquidAI/LFM2.5-Audio-1.5B)
needs streaming istft for generating output audio.

* add streaming ISTFT class (`mtmd_audio_streaming_istft`) with overlap-add for audio reconstruction
* replace global audio cache with per-instance cache, the model requires
  two independent caches, for preprocessing (audio input) and for istft
  (audio output).
* unified templated FFT/IFFT implementation supporting both forward and inverse transforms
 2026-01-06 21:00:29 +01:00
Xuan-Son Nguyen 8ea958d4d9
model : add ASR support for LFM2-Audio-1.5B (conformer) (#18106) 
* ASR with LFM2-Audio-1.5B

* Set rope_theta

* Fix comment

* Remove rope_theta setting

* Address PR feedback

* rename functions to conformer

* remove some redundant ggml_cont

* fix missing tensor

* add prefix "a." for conv tensors

* remove redundant reshape

* clean up

* add test model

---------

Co-authored-by: Tarek Dakhran <tarek@liquid.ai>
 2025-12-19 00:18:01 +01:00
Xuan-Son Nguyen 96a181a933
mtmd: refactor audio preprocessing (#17978) 
* mtmd: refactor audio preprocessing

* refactor

Co-authored-by: Tarek <tdakhran@users.noreply.github.com>

* wip

* wip (2)

* improve constructor

* fix use_natural_log

* fix padding for short input

* clean up

* remove need_chunking

---------

Co-authored-by: Tarek <tdakhran@users.noreply.github.com>
 2025-12-15 14:16:52 +01:00
Xuan-Son Nguyen 17158965ac
mtmd: explicitly forbidden inclusion of private header and libcommon (#17946) 2025-12-12 15:16:06 +01:00
Xuan-Son Nguyen 10961339b2
mtmd : move helpers to dedicated library (⚠️ breaking change) (#13866) 
* mtmd : move helpers to dedicated library

* fix server build

* rm leftover cmakelist code
 2025-05-28 22:35:22 +02:00
Xuan-Son Nguyen 797990c4bc
mtmd : add ultravox audio input (#13623) 
* convert ok, load ok

* warmup ok

* test

* still does not work?

* fix padding

* temporary give up

* fix merge conflict

* build_ultravox()

* rm test

* fix merge conflict

* add necessary mtmd APIs

* first working version (only 4s of audio)

* will this monster compile?

* fix compile

* please compile

* fPIC

* fix windows

* various fixes

* clean up audio_helpers

* fix conversion

* add some debug stuff

* long audio input ok

* adapt the api

* add --audio arg

* final touch UX

* add miniaudio to readme

* fix typo

* refactor kv metadata

* mtmd_default_marker()
 2025-05-22 20:42:48 +02:00