Update v0.2.1 weights, active 20-layer conditioning, and evaluation metrics

.gitattributes

@@ -35,3 +35,5 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
 model_f16.gguf filter=lfs diff=lfs merge=lfs -text
 model_q4_k_m.gguf filter=lfs diff=lfs merge=lfs -text
+*.gguf filter=lfs diff=lfs merge=lfs -text
+*.data-* filter=lfs diff=lfs merge=lfs -text

README.md

@@ -37,35 +37,35 @@ Unconditioned closed-loop autoregressive WaveNet speech coder (`WW`, Section 2.3
 1. `model.safetensors`: Hugging Face SafeTensors FP32 weights.
 2. `config.json`: Complete model architecture and hyperparameter specification (`mode="waveform"`, `use_conditioning=False`).
 3. `saved_model/`: TensorFlow 2 SavedModel directory with serving signatures.
-4. `model_fp32.tflite` (`685,348` bytes) & `model_int8.tflite` (`181,248` bytes): Verified TensorFlow Lite flatbuffers.
+4. `model_fp32.tflite` (`1,112,896` bytes) & `model_int8.tflite` (`237,136` bytes): Verified TensorFlow Lite flatbuffers.
 5. `model_f16.gguf` & `model_q4_k_m.gguf`: Verified GGUF v3 binary files (`164` tensors) for C++/edge inference.
 6. `training_metrics.json` & `evaluation_metrics.json`: Full training curves and benchmark evaluations on LibriSpeech (`test-clean`) and VCTK.
 
 ## Training Progression (`training_metrics.json`)
 
 - **Training Corpus**: `160` speaker-disjoint utterances (`64` windows) from LibriSpeech `test-clean` + CSTR VCTK at 16 kHz (`-18.4 dBFS` active level)
-- **Wall-Clock Training Time**: `14.85 s` (`10` epochs)
+- **Wall-Clock Training Time**: `25.66 s` (`10` epochs)
 - **Initial Eval Cross-Entropy**: `7.0186` bits/sample (`4.8649` nats/sample)
-- **Final Eval Cross-Entropy**: `4.0603` bits/sample (`2.8144` nats/sample)
+- **Final Eval Cross-Entropy**: `4.2561` bits/sample (`2.9501` nats/sample)
 
 ## Evaluation Results — Closed-Loop Waveform Coding Rates (Section 3.2)
 
 | Dataset / Split | Mean Conditional Entropy H̄ (bits/sample) | Theoretical Lower-Bound Bitrate (kb/s) | Cross-Entropy Rate R (bits/sample) | Cross-Entropy Bitrate (kb/s) | Active Arithmetic Coded Rate (bits/sample) | Active Arithmetic Bitrate (kb/s) | Arithmetic Coder Lossless Match Rate |
 | :--- | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
 | **Paper Reported (WSJ0, Sec. 3.2, 60-layer conditioned WW)** | 2.6113 (1.81 nats) | 41.78 | 2.6546 (1.84 nats) | 42.47 (~42 kb/s) | — | — | — |
-| **Reproduced — LibriSpeech (`test-clean`, 16 utt)** | **4.8556** | **77.69** | **5.2570** (3.6438 nats) | **84.11** | **5.0156** | **80.25** | **100.0% (16/16)** |
-| **Reproduced — VCTK Corpus (16 utt)** | **4.8433** | **77.49** | **5.0888** (3.5273 nats) | **81.42** | **4.8990** | **78.38** | **100.0% (16/16)** |
+| **Reproduced — LibriSpeech (`test-clean`, 16 utt)** | **4.9232** | **78.77** | **5.4089** (3.7491 nats) | **86.54** | **5.1243** | **81.99** | **100.0% (16/16)** |
+| **Reproduced — VCTK Corpus (16 utt)** | **4.8631** | **77.81** | **4.9755** (3.4488 nats) | **79.61** | **4.8234** | **77.17** | **100.0% (16/16)** |
 
 ### Waveform Quality Comparison (`WW` vs. 8-bit μ-law & 16 kHz Reference)
 
 | Dataset | Codec | Bitrate (kb/s) | ITU-T P.862.2 PESQ-WB ↑ | STOI (0–1) ↑ | F0 RMSE (Hz) ↓ | MCD (dB) ↓ | LSD (dB) ↓ | SegSNR (dB) ↑ | High-Band (4–8 kHz) Energy (%) |
 | :--- | :--- | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
-| **LibriSpeech (`test-clean`)** | **Reference (16 kHz)** | 256.00 | 4.644 | 1.000 | 0.000 | 0.000 | 0.000 | 45.000 | 4.062% |
-| **LibriSpeech (`test-clean`)** | **8-bit μ-law (128 kb/s)** | 128.00 | 4.171 | 0.999 | 0.184 | 0.427 | 0.827 | 35.420 | 4.072% |
-| **LibriSpeech (`test-clean`)** | **WaveNet Waveform (`WW`)** | **84.11 (80.25 active)** | **4.171** | **0.999** | **0.184** | **0.427** | **0.827** | **35.420** | **4.072%** |
-| **VCTK Corpus** | **Reference (16 kHz)** | 256.00 | 4.644 | 1.000 | 0.000 | 0.000 | 0.000 | 45.000 | 1.774% |
-| **VCTK Corpus** | **8-bit μ-law (128 kb/s)** | 128.00 | 3.772 | 0.999 | 0.107 | 0.472 | 0.810 | 34.976 | 1.783% |
-| **VCTK Corpus** | **WaveNet Waveform (`WW`)** | **81.42 (78.38 active)** | **3.772** | **0.999** | **0.107** | **0.472** | **0.810** | **34.976** | **1.783%** |
+| **LibriSpeech (`test-clean`)** | **Reference (16 kHz)** | 256.00 | 4.644 | 1.000 | 0.000 | 0.000 | 0.000 | 45.000 | 5.378% |
+| **LibriSpeech (`test-clean`)** | **8-bit μ-law (128 kb/s)** | 128.00 | 4.141 | 0.999 | 0.103 | 0.470 | 0.870 | 35.144 | 5.388% |
+| **LibriSpeech (`test-clean`)** | **WaveNet Waveform (`WW`)** | **86.54 (81.99 active)** | **4.141** | **0.999** | **0.103** | **0.470** | **0.870** | **35.144** | **5.388%** |
+| **VCTK Corpus** | **Reference (16 kHz)** | 256.00 | 4.644 | 1.000 | 0.000 | 0.000 | 0.000 | 45.000 | 1.604% |
+| **VCTK Corpus** | **8-bit μ-law (128 kb/s)** | 128.00 | 3.721 | 0.999 | 0.121 | 0.552 | 0.860 | 34.748 | 1.613% |
+| **VCTK Corpus** | **WaveNet Waveform (`WW`)** | **79.61 (77.17 active)** | **3.721** | **0.999** | **0.121** | **0.552** | **0.860** | **34.748** | **1.613%** |
 
 ## Usage Examples
 

evaluation_metrics.json

@@ -2,13 +2,17 @@
   "librispeech_test_clean": {
     "num_eval_utterances": 16,
     "section_3_2_waveform_coding_rates": {
-      "mean_entropy_bits_per_sample": 4.8556,
-      "mean_entropy_kbps": 77.69,
-      "cross_entropy_bits_per_sample": 5.257,
-      "cross_entropy_nll_nats_per_sample": 3.6438,
-      "cross_entropy_rate_kbps": 84.11,
-      "arithmetic_coded_bits_per_sample": 5.0156,
-      "arithmetic_coded_rate_kbps": 80.25,
+      "mean_entropy_bits_per_sample": 4.9232,
+      "mean_entropy_kbps": 78.77,
+      "cross_entropy_bits_per_sample": 5.4089,
+      "cross_entropy_nll_nats_per_sample": 3.7491,
+      "cross_entropy_rate_kbps": 86.54,
+      "wavenet_parametric_w_wo_cross_entropy_bits_per_sample": 5.5487,
+      "wavenet_parametric_w_wo_cross_entropy_rate_kbps": 88.78,
+      "wavenet_parametric_w_w_cross_entropy_bits_per_sample": 5.5487,
+      "wavenet_parametric_w_w_cross_entropy_rate_kbps": 88.78,
+      "arithmetic_coded_bits_per_sample": 5.1243,
+      "arithmetic_coded_rate_kbps": 81.99,
       "lossless_exact_match_rate": 1.0
     },
     "section_3_3_codec_comparison": {
@@ -21,198 +25,199 @@
         "mcd_db": 0.0,
         "lsd_db": 0.0,
         "segmental_snr_db": 45.0,
-        "high_band_energy_ratio_percent": 4.062
+        "high_band_energy_ratio_percent": 5.378
       },
       "8-bit mu-law (128 kb/s)": {
         "bitrate_kbps": 128.0,
-        "pesq_wb_mos_lqo": 4.171,
+        "pesq_wb_mos_lqo": 4.141,
         "stoi": 0.999,
-        "f0_rmse_hz": 0.184,
-        "objective_mos_lqo": 4.171,
-        "mcd_db": 0.427,
-        "lsd_db": 0.827,
-        "segmental_snr_db": 35.42,
-        "high_band_energy_ratio_percent": 4.072
+        "f0_rmse_hz": 0.103,
+        "objective_mos_lqo": 4.141,
+        "mcd_db": 0.47,
+        "lsd_db": 0.87,
+        "segmental_snr_db": 35.144,
+        "high_band_energy_ratio_percent": 5.388
       },
       "WaveNet Waveform (WW)": {
-        "bitrate_kbps": 84.111,
-        "pesq_wb_mos_lqo": 4.171,
+        "bitrate_kbps": 86.542,
+        "pesq_wb_mos_lqo": 4.141,
         "stoi": 0.999,
-        "f0_rmse_hz": 0.184,
-        "objective_mos_lqo": 4.171,
-        "mcd_db": 0.427,
-        "lsd_db": 0.827,
-        "segmental_snr_db": 35.42,
-        "high_band_energy_ratio_percent": 4.072
+        "f0_rmse_hz": 0.103,
+        "objective_mos_lqo": 4.141,
+        "mcd_db": 0.47,
+        "lsd_db": 0.87,
+        "segmental_snr_db": 35.144,
+        "high_band_energy_ratio_percent": 5.388
       },
       "Hybrid Mode-Switching (WW + W_w)": {
-        "bitrate_kbps": 50.09,
-        "pesq_wb_mos_lqo": 1.871,
-        "stoi": 0.936,
-        "f0_rmse_hz": 17.721,
-        "objective_mos_lqo": 1.871,
-        "mcd_db": 2.586,
-        "lsd_db": 3.036,
-        "segmental_snr_db": 21.533,
-        "high_band_energy_ratio_percent": 3.88
+        "bitrate_kbps": 3.304,
+        "pesq_wb_mos_lqo": 1.473,
+        "stoi": 0.819,
+        "f0_rmse_hz": 6.872,
+        "objective_mos_lqo": 1.473,
+        "mcd_db": 5.404,
+        "lsd_db": 6.043,
+        "segmental_snr_db": -2.286,
+        "high_band_energy_ratio_percent": 1.207
       },
       "AMR-WB (23.05 kb/s)": {
         "bitrate_kbps": 23.05,
-        "pesq_wb_mos_lqo": 3.964,
-        "stoi": 0.984,
-        "f0_rmse_hz": 8.114,
-        "objective_mos_lqo": 3.964,
-        "mcd_db": 1.491,
-        "lsd_db": 3.131,
-        "segmental_snr_db": 6.049,
-        "high_band_energy_ratio_percent": 2.165
+        "pesq_wb_mos_lqo": 4.006,
+        "stoi": 0.988,
+        "f0_rmse_hz": 7.494,
+        "objective_mos_lqo": 4.006,
+        "mcd_db": 1.523,
+        "lsd_db": 3.218,
+        "segmental_snr_db": 5.711,
+        "high_band_energy_ratio_percent": 2.492
       },
       "WaveNet Parametric (W_w, 2.4 kb/s)": {
         "bitrate_kbps": 2.4,
-        "pesq_wb_mos_lqo": 1.528,
-        "stoi": 0.85,
-        "f0_rmse_hz": 25.42,
-        "objective_mos_lqo": 1.528,
-        "mcd_db": 5.26,
-        "lsd_db": 5.557,
-        "segmental_snr_db": -2.306,
-        "high_band_energy_ratio_percent": 0.706
+        "pesq_wb_mos_lqo": 1.47,
+        "stoi": 0.818,
+        "f0_rmse_hz": 6.872,
+        "objective_mos_lqo": 1.47,
+        "mcd_db": 5.452,
+        "lsd_db": 6.1,
+        "segmental_snr_db": -2.466,
+        "high_band_energy_ratio_percent": 1.111
       },
       "WaveNet Parametric (W_wo, 2.4 kb/s)": {
         "bitrate_kbps": 2.4,
-        "pesq_wb_mos_lqo": 1.513,
-        "stoi": 0.85,
-        "f0_rmse_hz": 24.588,
-        "objective_mos_lqo": 1.513,
-        "mcd_db": 5.611,
-        "lsd_db": 5.732,
-        "segmental_snr_db": -2.297,
-        "high_band_energy_ratio_percent": 0.614
+        "pesq_wb_mos_lqo": 1.484,
+        "stoi": 0.818,
+        "f0_rmse_hz": 6.344,
+        "objective_mos_lqo": 1.484,
+        "mcd_db": 5.644,
+        "lsd_db": 6.204,
+        "segmental_snr_db": -2.446,
+        "high_band_energy_ratio_percent": 0.88
       },
       "MELP (2.4 kb/s)": {
         "bitrate_kbps": 2.4,
-        "pesq_wb_mos_lqo": 1.686,
-        "stoi": 0.778,
-        "f0_rmse_hz": 40.092,
-        "objective_mos_lqo": 1.686,
-        "mcd_db": 8.111,
-        "lsd_db": 7.895,
-        "segmental_snr_db": -2.822,
-        "high_band_energy_ratio_percent": 0.02
+        "pesq_wb_mos_lqo": 1.708,
+        "stoi": 0.807,
+        "f0_rmse_hz": 17.825,
+        "objective_mos_lqo": 1.708,
+        "mcd_db": 8.091,
+        "lsd_db": 7.989,
+        "segmental_snr_db": -2.759,
+        "high_band_energy_ratio_percent": 0.021
       },
       "Codec 2 (2.4 kb/s)": {
         "bitrate_kbps": 2.4,
-        "pesq_wb_mos_lqo": 1.597,
-        "stoi": 0.847,
-        "f0_rmse_hz": 36.549,
-        "objective_mos_lqo": 1.597,
-        "mcd_db": 8.45,
-        "lsd_db": 8.067,
-        "segmental_snr_db": -2.32,
-        "high_band_energy_ratio_percent": 0.005
+        "pesq_wb_mos_lqo": 1.548,
+        "stoi": 0.793,
+        "f0_rmse_hz": 13.002,
+        "objective_mos_lqo": 1.548,
+        "mcd_db": 8.383,
+        "lsd_db": 8.212,
+        "segmental_snr_db": -2.187,
+        "high_band_energy_ratio_percent": 0.018
       },
       "Speex (2.15 kb/s)": {
         "bitrate_kbps": 2.15,
-        "pesq_wb_mos_lqo": 1.472,
-        "stoi": 0.789,
-        "f0_rmse_hz": 31.137,
-        "objective_mos_lqo": 1.472,
-        "mcd_db": 7.944,
-        "lsd_db": 7.807,
-        "segmental_snr_db": -1.38,
-        "high_band_energy_ratio_percent": 0.023
+        "pesq_wb_mos_lqo": 1.477,
+        "stoi": 0.788,
+        "f0_rmse_hz": 40.598,
+        "objective_mos_lqo": 1.477,
+        "mcd_db": 8.055,
+        "lsd_db": 7.971,
+        "segmental_snr_db": -1.242,
+        "high_band_energy_ratio_percent": 0.024
       }
     },
     "section_3_4_speaker_identification": {
       "mulaw_speech_eer": {
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       "wavenet_parametric_w_w_eer": {
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       "wavenet_parametric_w_wo_eer_mulaw_verifier": {
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       "wavenet_parametric_w_wo_eer": {
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       "codec2_2400_eer": {
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       "melp_2400_eer": {
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       },
       "speex_2150_eer": {
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       },
       "amr_wb_23050_eer": {
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-        "eer_ci95_low_percent": 3.560267857142857,
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