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compressionkit-ppg-16x

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Release deployment artifacts from CompressionKit

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Files changed (10) hide show
  1. README.md +98 -0
  2. codebook.h +0 -0
  3. codebook.npz +3 -0
  4. config.json +56 -0
  5. decoder.h +0 -0
  6. decoder_int8.tflite +3 -0
  7. encoder.h +0 -0
  8. encoder_int8.tflite +3 -0
  9. quality_scorecard.json +598 -0
  10. sample_stimulus.npz +3 -0
README.md ADDED
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+ ---
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+ license: apache-2.0
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+ library_name: compressionkit
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+ pipeline_tag: other
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+ tags:
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+ - compressionkit
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+ - signal-compression
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+ - ppg
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+ - rvq
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+ - tflite
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+ - edge-ai
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+ ---
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+
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+ # compressionkit-ppg-16x
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+
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+ A **PPG** signal compression codec using Residual Vector Quantization (RVQ), optimized for edge and wearable devices.
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+
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+ ## Model Details
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+
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+ - **Modality:** PPG
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+ - **Sample Rate:** 64 Hz
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+ - **Compression Ratio:** 16x
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+ - **Quantization:** INT8
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+ - **RVQ Levels:** 4
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+ - **Codebook Size:** 256 entries × 16D
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+ - **Encoder Input:** `[None, 1, 320, 1]`
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+ - **Encoder Output:** `[None, 1, 20, 16]`
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+
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+ ## Quality Metrics
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+
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+ ### Time Domain
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+
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+ | Metric | Mean | Median | P90 |
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+ |--------|------|--------|-----|
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+ | PRD (%) | 12.4496 | 5.4119 | 25.0669 |
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+ | RMSE | 0.0629 | 0.0476 | 0.0905 |
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+ | Cosine Similarity | 0.9663 | 0.9986 | 0.9993 |
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+
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+ ### Spectral
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+
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+ - **Band Total Relative Error (median):** 0.0486
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+
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+ ### Bitrate
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+
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+ - **Codec CR (uniform):** 16.0x
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+ - **Codec CR (learned prior):** 16.30x
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+
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+ ## Usage
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+
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+ ### Python (compressionkit runtime)
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+
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+ ```python
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+ from compressionkit.runtime import RVQCodec
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+
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+ codec = RVQCodec.from_pretrained("Ambiq/compressionkit-ppg-16x")
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+
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+ # Encode: float32 signal → RVQ indices
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+ indices = codec.encode(signal)
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+
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+ # Decode: RVQ indices → reconstructed signal
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+ recon = codec.decode(indices)
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+ ```
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+
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+ ### Local deployment directory
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+
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+ ```python
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+ codec = RVQCodec("path/to/deploy/")
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+ ```
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+
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+ ## Files
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+
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+ | File | Description |
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+ |------|-------------|
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+ | `encoder_int8.tflite` | INT8 quantized encoder (on-device) |
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+ | `encoder.h` | C header for encoder |
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+ | `decoder_float32.tflite` | Float32 decoder (server-side evaluation) |
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+ | `decoder_int8.tflite` | INT8 decoder (optional, on-device) |
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+ | `codebook.npz` | RVQ codebook tables |
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+ | `codebook.h` | C header for codebook |
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+ | `config.json` | Deployment manifest |
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+ | `sample_stimulus.npz` | Synthetic test data |
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+ | `quality_scorecard.json` | Full evaluation metrics |
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+
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+ ## Dataset & License
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+
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+ Training data: MESA (NSRR restricted). Sample data uses synthetic physiokit waveforms only — no patient data is redistributed.
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+
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+ Model weights are released under the **APACHE-2.0** license.
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+
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+ ## Citation
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+
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+ ```bibtex
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+ @software{compressionkit,
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+ author = {Ambiq AI},
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+ title = {compressionKIT: Signal Compression for Edge AI},
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+ url = {https://github.com/AmbiqAI/compressionkit}
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+ }
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+ ```
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+ {
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+ "model_name": "ppg_rvq_64hz_16x_golden",
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+ "model_version": "1.0",
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+ "quantization": "INT8",
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+ "io_type": "int8",
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+ "header": "codebook.h",
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+ "num_levels": 4,
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+ "num_embeddings": 256,
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+ "embedding_dim": 16
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+ },
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+ "sample_data": {
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+ "npz": "sample_data.npz",
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+ "num_samples": 50,
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+ "arrays": [
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+ "inputs",
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+ "targets",
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+ "reconstructions"
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+ ]
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+ }
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+ }
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