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547765a93e
* 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 |
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| .. | ||
| ggml-blas | ||
| ggml-cann | ||
| ggml-cpu | ||
| ggml-cuda | ||
| ggml-hexagon | ||
| ggml-hip | ||
| ggml-metal | ||
| ggml-musa | ||
| ggml-opencl | ||
| ggml-openvino | ||
| ggml-rpc | ||
| ggml-sycl | ||
| ggml-virtgpu | ||
| ggml-vulkan | ||
| ggml-webgpu | ||
| ggml-zdnn | ||
| ggml-zendnn | ||
| CMakeLists.txt | ||
| ggml-alloc.c | ||
| ggml-backend-dl.cpp | ||
| ggml-backend-dl.h | ||
| ggml-backend-impl.h | ||
| ggml-backend-meta.cpp | ||
| ggml-backend-reg.cpp | ||
| ggml-backend.cpp | ||
| ggml-common.h | ||
| ggml-ext.h | ||
| ggml-impl.h | ||
| ggml-opt.cpp | ||
| ggml-quants.c | ||
| ggml-quants.h | ||
| ggml-threading.cpp | ||
| ggml-threading.h | ||
| ggml.c | ||
| ggml.cpp | ||
| gguf.cpp | ||