{
  "schema_version": "2",
  "repo": "FluidInference/pocket-tts-coreml",
  "repo_url": "https://huggingface.co/FluidInference/pocket-tts-coreml",
  "generated": "2026-04-26T05:04:10+00:00",
  "design": "Per-submodel quantization selection. The four PocketTTS submodels (cond_step, flowlm_step, flow_decoder, mimi_decoder) are independently swappable between fp16 and int8 \u2014 the int8 .mlpackage has the exact same input/output signature as the fp16 one, so a user can mix-and-match any subset (e.g. flow_decoder=fp16, the other three=int8) by loading different paths into the same PocketTTS pipeline.",
  "quantization": {
    "scheme": "CoreML weight-only int8",
    "granularity": "per-channel symmetric",
    "weight_threshold": 100000,
    "activation_precision": "fp16",
    "tool": "coremltools.optimize.coreml.linear_quantize_weights",
    "notes": "Only body weights with \u2265100K elements are quantized; small head/tail linears stay fp16. Activations are NOT quantized (W8A16 weight-only, not W8A8). Audio quality A/B was run on English 6L only \u2014 non-English not yet A/B'd."
  },
  "ab_test": {
    "language": "english",
    "layer_count": "6L",
    "prompt": "The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs.",
    "voice": "alba",
    "seed": 42,
    "metrics": [
      "Pearson r (waveform-level correlation vs fp16 baseline)",
      "Speaker similarity (256-dim embedding cosine; 0.65 = identity threshold)"
    ]
  },
  "per_submodel": {
    "cond_step": {
      "audio_quality_int8_only": {
        "speaker_sim": 0.984,
        "pearson": 0.94,
        "verdict": "safe",
        "summary": "minor drift, well within identity threshold"
      },
      "swap_independent": true
    },
    "flowlm_step": {
      "audio_quality_int8_only": {
        "speaker_sim": 0.989,
        "pearson": 0.94,
        "verdict": "safe",
        "summary": "minor drift, well within identity threshold"
      },
      "swap_independent": true
    },
    "flow_decoder": {
      "audio_quality_int8_only": {
        "speaker_sim": 0.981,
        "pearson": 0.78,
        "verdict": "risky",
        "summary": "audible drift; 8-step LSD inner loop compounds quantization error"
      },
      "swap_independent": true
    },
    "mimi_decoder": {
      "audio_quality_int8_only": {
        "speaker_sim": 0.998,
        "pearson": 1.0,
        "verdict": "transparent",
        "summary": "no audible difference vs fp16"
      },
      "swap_independent": true
    }
  },
  "selection_profiles": {
    "all_fp16_baseline": {
      "description": "Reference; everything fp16. No int8 used.",
      "size_english_mlmodelc": "\u2248601 MiB (existing fp16 ship)",
      "models": {
        "cond_step": "fp16",
        "flowlm_step": "fp16",
        "flow_decoder": "fp16",
        "mimi_decoder": "fp16"
      },
      "expected_quality": "reference"
    },
    "safe_int8": {
      "description": "Quantize only the three transparent/safe submodels. Recommended for production.",
      "models": {
        "cond_step": "int8",
        "flowlm_step": "int8",
        "flow_decoder": "fp16",
        "mimi_decoder": "int8"
      },
      "english_mlmodelc_size": "\u2248147 MiB (vs 601 MiB fp16; -75%)",
      "expected_quality": "speaker similarity \u22650.98 vs fp16"
    },
    "aggressive_int8": {
      "description": "All four int8. Max compression but flow_decoder introduces audible drift.",
      "models": {
        "cond_step": "int8",
        "flowlm_step": "int8",
        "flow_decoder": "int8",
        "mimi_decoder": "int8"
      },
      "english_mlmodelc_size": "\u2248156 MiB (vs 601 MiB fp16; -74%)",
      "expected_quality": "speaker similarity 0.940 (still above 0.65 threshold)"
    },
    "user_custom": {
      "description": "Any of the 2^4 = 16 combinations is valid. Pick per submodel based on the audio_quality_int8_only field above and your own ear / target binary size.",
      "example": {
        "cond_step": "int8",
        "flowlm_step": "fp16",
        "flow_decoder": "fp16",
        "mimi_decoder": "int8"
      }
    }
  },
  "languages": {
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      "layer_count": "6L",
      "int8_dir": "languages/english/int8",
      "manifest_txt": "languages/english/english.txt",
      "size_bytes": 328626045,
      "size_human": "313.4 MiB",
      "submodels": {
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          "fp16": {
            "path_in_repo": "cond_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/english/int8/cond_step.mlpackage",
              "size_bytes": 66955176,
              "size_human": "63.9 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/english/int8/cond_step.mlmodelc",
              "size_bytes": 66995543,
              "size_human": "63.9 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.984,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flowlm_step": {
          "fp16": {
            "path_in_repo": "flowlm_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/english/int8/flowlm_step.mlpackage",
              "size_bytes": 76498561,
              "size_human": "73.0 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/english/int8/flowlm_step.mlmodelc",
              "size_bytes": 76542686,
              "size_human": "73.0 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.989,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flow_decoder": {
          "fp16": {
            "path_in_repo": "flow_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/english/int8/flow_decoder.mlpackage",
              "size_bytes": 9923605,
              "size_human": "9.5 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/english/int8/flow_decoder.mlmodelc",
              "size_bytes": 9939641,
              "size_human": "9.5 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.981,
            "pearson": 0.78,
            "verdict": "risky",
            "summary": "audible drift; 8-step LSD inner loop compounds quantization error"
          }
        },
        "mimi_decoder": {
          "fp16": {
            "path_in_repo": "mimi_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/english/int8/mimi_decoder.mlpackage",
              "size_bytes": 10867723,
              "size_human": "10.4 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/english/int8/mimi_decoder.mlmodelc",
              "size_bytes": 10903110,
              "size_human": "10.4 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.998,
            "pearson": 1.0,
            "verdict": "transparent",
            "summary": "no audible difference vs fp16"
          }
        }
      }
    },
    "german": {
      "layer_count": "6L",
      "int8_dir": "languages/german/int8",
      "manifest_txt": "languages/german/german.txt",
      "size_bytes": 328626042,
      "size_human": "313.4 MiB",
      "submodels": {
        "cond_step": {
          "fp16": {
            "path_in_repo": "languages/german/cond_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/german/int8/cond_step.mlpackage",
              "size_bytes": 66955175,
              "size_human": "63.9 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/german/int8/cond_step.mlmodelc",
              "size_bytes": 66995541,
              "size_human": "63.9 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.984,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flowlm_step": {
          "fp16": {
            "path_in_repo": "languages/german/flowlm_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/german/int8/flowlm_step.mlpackage",
              "size_bytes": 76498561,
              "size_human": "73.0 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/german/int8/flowlm_step.mlmodelc",
              "size_bytes": 76542686,
              "size_human": "73.0 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.989,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flow_decoder": {
          "fp16": {
            "path_in_repo": "languages/german/flow_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/german/int8/flow_decoder.mlpackage",
              "size_bytes": 9923605,
              "size_human": "9.5 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/german/int8/flow_decoder.mlmodelc",
              "size_bytes": 9939641,
              "size_human": "9.5 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.981,
            "pearson": 0.78,
            "verdict": "risky",
            "summary": "audible drift; 8-step LSD inner loop compounds quantization error"
          }
        },
        "mimi_decoder": {
          "fp16": {
            "path_in_repo": "languages/german/mimi_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/german/int8/mimi_decoder.mlpackage",
              "size_bytes": 10867723,
              "size_human": "10.4 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/german/int8/mimi_decoder.mlmodelc",
              "size_bytes": 10903110,
              "size_human": "10.4 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.998,
            "pearson": 1.0,
            "verdict": "transparent",
            "summary": "no audible difference vs fp16"
          }
        }
      }
    },
    "italian": {
      "layer_count": "6L",
      "int8_dir": "languages/italian/int8",
      "manifest_txt": "languages/italian/italian.txt",
      "size_bytes": 328626042,
      "size_human": "313.4 MiB",
      "submodels": {
        "cond_step": {
          "fp16": {
            "path_in_repo": "languages/italian/cond_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/italian/int8/cond_step.mlpackage",
              "size_bytes": 66955175,
              "size_human": "63.9 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/italian/int8/cond_step.mlmodelc",
              "size_bytes": 66995541,
              "size_human": "63.9 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.984,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flowlm_step": {
          "fp16": {
            "path_in_repo": "languages/italian/flowlm_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/italian/int8/flowlm_step.mlpackage",
              "size_bytes": 76498561,
              "size_human": "73.0 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/italian/int8/flowlm_step.mlmodelc",
              "size_bytes": 76542686,
              "size_human": "73.0 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.989,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flow_decoder": {
          "fp16": {
            "path_in_repo": "languages/italian/flow_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/italian/int8/flow_decoder.mlpackage",
              "size_bytes": 9923605,
              "size_human": "9.5 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/italian/int8/flow_decoder.mlmodelc",
              "size_bytes": 9939641,
              "size_human": "9.5 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.981,
            "pearson": 0.78,
            "verdict": "risky",
            "summary": "audible drift; 8-step LSD inner loop compounds quantization error"
          }
        },
        "mimi_decoder": {
          "fp16": {
            "path_in_repo": "languages/italian/mimi_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/italian/int8/mimi_decoder.mlpackage",
              "size_bytes": 10867723,
              "size_human": "10.4 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/italian/int8/mimi_decoder.mlmodelc",
              "size_bytes": 10903110,
              "size_human": "10.4 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.998,
            "pearson": 1.0,
            "verdict": "transparent",
            "summary": "no audible difference vs fp16"
          }
        }
      }
    },
    "portuguese": {
      "layer_count": "6L",
      "int8_dir": "languages/portuguese/int8",
      "manifest_txt": "languages/portuguese/portuguese.txt",
      "size_bytes": 328626042,
      "size_human": "313.4 MiB",
      "submodels": {
        "cond_step": {
          "fp16": {
            "path_in_repo": "languages/portuguese/cond_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/cond_step.mlpackage",
              "size_bytes": 66955175,
              "size_human": "63.9 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/cond_step.mlmodelc",
              "size_bytes": 66995541,
              "size_human": "63.9 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.984,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flowlm_step": {
          "fp16": {
            "path_in_repo": "languages/portuguese/flowlm_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/flowlm_step.mlpackage",
              "size_bytes": 76498561,
              "size_human": "73.0 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/flowlm_step.mlmodelc",
              "size_bytes": 76542686,
              "size_human": "73.0 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.989,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flow_decoder": {
          "fp16": {
            "path_in_repo": "languages/portuguese/flow_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/flow_decoder.mlpackage",
              "size_bytes": 9923605,
              "size_human": "9.5 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/flow_decoder.mlmodelc",
              "size_bytes": 9939641,
              "size_human": "9.5 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.981,
            "pearson": 0.78,
            "verdict": "risky",
            "summary": "audible drift; 8-step LSD inner loop compounds quantization error"
          }
        },
        "mimi_decoder": {
          "fp16": {
            "path_in_repo": "languages/portuguese/mimi_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/mimi_decoder.mlpackage",
              "size_bytes": 10867723,
              "size_human": "10.4 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/portuguese/int8/mimi_decoder.mlmodelc",
              "size_bytes": 10903110,
              "size_human": "10.4 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.998,
            "pearson": 1.0,
            "verdict": "transparent",
            "summary": "no audible difference vs fp16"
          }
        }
      }
    },
    "spanish": {
      "layer_count": "6L",
      "int8_dir": "languages/spanish/int8",
      "manifest_txt": "languages/spanish/spanish.txt",
      "size_bytes": 328626043,
      "size_human": "313.4 MiB",
      "submodels": {
        "cond_step": {
          "fp16": {
            "path_in_repo": "languages/spanish/cond_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/cond_step.mlpackage",
              "size_bytes": 66955175,
              "size_human": "63.9 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/cond_step.mlmodelc",
              "size_bytes": 66995541,
              "size_human": "63.9 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.984,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flowlm_step": {
          "fp16": {
            "path_in_repo": "languages/spanish/flowlm_step.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/flowlm_step.mlpackage",
              "size_bytes": 76498561,
              "size_human": "73.0 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/flowlm_step.mlmodelc",
              "size_bytes": 76542686,
              "size_human": "73.0 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.989,
            "pearson": 0.94,
            "verdict": "safe",
            "summary": "minor drift, well within identity threshold"
          }
        },
        "flow_decoder": {
          "fp16": {
            "path_in_repo": "languages/spanish/flow_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/flow_decoder.mlpackage",
              "size_bytes": 9923605,
              "size_human": "9.5 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/flow_decoder.mlmodelc",
              "size_bytes": 9939641,
              "size_human": "9.5 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.981,
            "pearson": 0.78,
            "verdict": "risky",
            "summary": "audible drift; 8-step LSD inner loop compounds quantization error"
          }
        },
        "mimi_decoder": {
          "fp16": {
            "path_in_repo": "languages/spanish/mimi_decoder.mlmodelc",
            "format": "mlmodelc",
            "note": "shipped separately; not part of this int8 upload"
          },
          "int8": {
            "mlpackage": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/mimi_decoder.mlpackage",
              "size_bytes": 10867723,
              "size_human": "10.4 MiB"
            },
            "mlmodelc": {
              "present": true,
              "path_in_repo": "languages/spanish/int8/mimi_decoder.mlmodelc",
              "size_bytes": 10903111,
              "size_human": "10.4 MiB"
            }
          },
          "audio_quality": {
            "speaker_sim": 0.998,
            "pearson": 1.0,
            "verdict": "transparent",
            "summary": "no audible difference vs fp16"
          }
        }
      }
    },
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