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"created_utc": "2026-08-27T04:52:43Z",
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"human_listening_correction": {
"initial_unblinded_finding": "The standalone NVFP4 output sounded bland, monotone, robotic, flat, and insufficiently like the reference; explicit tags did not repair perceived expressiveness.",
"bf16_control_finding": "The pinned BF16 base shared the broad expressiveness and speaker-likeness weakness versus VoxCPM2, so flat delivery alone is not NVFP4-specific damage.",
"blind_gate_status": "single_listener_single_reference_english_clone_identity_pass",
"blind_gate_response": "20260827T082148Z-5e83e8bb",
"speaker_likeness": "all four BF16 and all four NVFP4 samples scored 5/5",
"preferences": {
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"tie": 1
},
"mean_reference_style": {
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"limitation": "This does not qualify cloning across other speakers, languages, or recording conditions."
},
"scope_and_limitations": [
"English automated signal, spectral, ASR, speaker-embedding, and held-out long-termination gates passed.",
"A four-pair blind test with one listener and one consented English reference found no precision-specific speaker-identity loss versus BF16.",
"S2-Pro BF16 and this V1 derivative both sounded flatter and less expressive than VoxCPM2 in the evaluated reference comparison; V1 does not claim to fix that inherited limitation.",
"The objective speaker embedding saturated and did not predict human preference, so new voices still require listening evaluation.",
"This policy is not qualified for other languages; use MXFP8 or BF16 when multilingual coverage matters.",
"The runtime requires NVIDIA Blackwell SM120, CUDA 13.0, and the bundled/pinned software path.",
"Loaded allocation is 5.350 GiB, but held-out long-form peak reached 7.561 GiB.",
"The ordinary single-speaker API is not true low-latency semantic/audio streaming."
],
"packaged_utc": "2026-08-27T08:41:54Z",
"release": {
"version": "1.0",
"channel": "v1",
"xpo3_release": false,
"scope": "English-only research and non-commercial release",
"repository_name": "ajh-code/Fish-Audio-S2-Pro-NVFP4-Balanced",
"self_contained_weights": true,
"display_name": "V1 · Fish Audio S2-Pro · NVFP4 Balanced",
"profile": "balanced"
},
"conversion_implementation_files": {
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"license": {
"name": "Fish Audio Research License",
"commercial_use": "requires a separate written license from Fish Audio",
"notice_file": "Notice",
"built_with_fish_audio": true
}
}