feat: initial public release v0.1.0 — MLX port of pyannote-speaker-diarization-3.1

Byte-parity with pyannote-PyTorch reference (cosine 0.763718 identical
at 6 decimals on 200 cross-window slot pairs). 2.5x faster than
pyannote-MPS on Apple Silicon native.

Extracted from gitea.tavportal.com/olivier/MLX_CONVERTOR commit 5f9eafa.

tests/unit/test_diar_audio_fbank.py

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+import numpy as np
+import mlx.core as mx
+import torch
+from torchaudio.compliance import kaldi as ta_kaldi
+from pyannote_diarization_3_1_mlx.audio import kaldi_fbank, load_waveform
+
+
+def _fixed_signal(seconds: float = 3.0, sr: int = 16000):
+    t = np.linspace(0, seconds, int(seconds * sr), endpoint=False)
+    sig = (
+        0.5 * np.sin(2 * np.pi * 220 * t)
+        + 0.3 * np.sin(2 * np.pi * 880 * t)
+    ).astype(np.float32)
+    return sig
+
+
+def test_fbank_matches_torchaudio_within_1pct():
+    sig = _fixed_signal()
+    # torchaudio reference: same params as pyannote WeSpeaker
+    sig_torch = torch.from_numpy(sig).unsqueeze(0) * (1 << 15)
+    ref = ta_kaldi.fbank(
+        sig_torch,
+        num_mel_bins=80,
+        frame_length=25,
+        frame_shift=10,
+        dither=0.0,
+        window_type="hamming",
+        use_energy=False,
+        sample_frequency=16000,
+    ).numpy()  # (T, 80)
+
+    # Our MLX implementation, with same scaling and CMN
+    sig_mx = mx.array(sig)
+    out = kaldi_fbank(
+        sig_mx,
+        num_mel_bins=80,
+        frame_length_ms=25,
+        frame_shift_ms=10,
+        dither=0.0,
+        window_type="hamming",
+        use_energy=False,
+        sample_rate=16000,
+    )
+    out_np = np.asarray(out)
+    assert out_np.shape == ref.shape
+    # max abs diff should be small (kaldi-compliant, no random init)
+    diff = np.abs(out_np - ref).max()
+    assert diff < 0.05, f"max abs diff {diff:.4f}"
+
+
+def test_load_waveform_resamples_to_16k():
+    import soundfile as sf
+    import tempfile, os
+    with tempfile.NamedTemporaryFile(suffix=".wav", delete=False) as f:
+        sf.write(f.name, _fixed_signal(seconds=1.0, sr=22050), 22050)
+        wav_mx = load_waveform(f.name)
+        os.unlink(f.name)
+    assert wav_mx.shape[-1] == 16000  # 1 second @ 16k after resample
+    assert wav_mx.dtype == mx.float32

tests/unit/test_diar_bilstm.py

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+import mlx.core as mx
+from pyannote_diarization_3_1_mlx._bilstm import BiLSTM4
+
+
+def test_bilstm_output_shape():
+    # input (B, T, hidden_in) — pyannote feeds 60-channel sincnet output
+    # transposed to (B, T, 60). hidden=128, bidirectional → 256 out.
+    net = BiLSTM4(input_size=60, hidden_size=128)
+    x = mx.zeros((1, 589, 60))
+    out = net(x)
+    assert out.shape == (1, 589, 256), f"got {out.shape}"

tests/unit/test_diar_clustering.py

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+import numpy as np
+from pyannote_diarization_3_1_mlx.clustering import cluster_embeddings
+
+
+def test_two_well_separated_clusters():
+    rng = np.random.default_rng(42)
+    a = rng.normal(loc=[1.0, 0.0, 0.0] + [0.0]*253, scale=0.01, size=(10, 256))
+    b = rng.normal(loc=[0.0, 1.0, 0.0] + [0.0]*253, scale=0.01, size=(10, 256))
+    emb = np.vstack([a, b]).astype(np.float32)
+    labels = cluster_embeddings(emb, num_speakers=2)
+    assert len(set(labels[:10])) == 1
+    assert len(set(labels[10:])) == 1
+    assert labels[0] != labels[10]
+
+
+def test_threshold_based():
+    rng = np.random.default_rng(0)
+    emb = rng.normal(size=(30, 256)).astype(np.float32)
+    labels = cluster_embeddings(emb, num_speakers=None,
+                                min_speakers=1, max_speakers=10)
+    assert 1 <= len(set(labels)) <= 10

tests/unit/test_diar_config.py

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+from pyannote_diarization_3_1_mlx._config import (
+    SEG_DURATION, SEG_HOP, SEG_FRAMES, SEG_CLASSES,
+    MAX_SPEAKERS_PER_CHUNK, MAX_SPEAKERS_PER_FRAME,
+    EMB_BATCH_SIZE, EMB_EXCLUDE_OVERLAP,
+    CLUSTER_METHOD, CLUSTER_THRESHOLD, CLUSTER_MIN_SIZE,
+    SEG_HF_REPO, SEG_HF_REV, EMB_HF_REPO, EMB_HF_REV,
+)
+
+
+def test_pyannote_3_1_locked_hyperparameters():
+    assert SEG_DURATION == 10.0
+    assert SEG_HOP == 1.0
+    assert SEG_FRAMES == 589
+    assert SEG_CLASSES == 7
+    assert MAX_SPEAKERS_PER_CHUNK == 3
+    assert MAX_SPEAKERS_PER_FRAME == 2
+    assert EMB_BATCH_SIZE == 32
+    assert EMB_EXCLUDE_OVERLAP is True
+    assert CLUSTER_METHOD == "centroid"
+    assert CLUSTER_THRESHOLD == 0.7045654963945799
+    assert CLUSTER_MIN_SIZE == 12
+
+
+def test_locked_hf_revisions():
+    assert SEG_HF_REPO == "mlx-community/pyannote-segmentation-3.0-mlx"
+    assert SEG_HF_REV == "5189a69b35c5f7e48082a978f3476bac81590874"
+    assert EMB_HF_REPO == "mlx-community/wespeaker-voxceleb-resnet34-LM"
+    assert EMB_HF_REV == "97fc9343d2cfd0ae4d1c1d8c299e0046aa502e31"

tests/unit/test_diar_embedding_shape.py

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+import mlx.core as mx
+from pyannote_diarization_3_1_mlx.embedding import EmbeddingModel
+from pyannote_diarization_3_1_mlx._config import EMB_DIM
+
+
+def test_embedding_output_shape():
+    m = EmbeddingModel()
+    fb = mx.zeros((2, 200, 80))  # (B, T, mel)
+    weights = mx.ones((2, 200))
+    emb = m(fb, weights)
+    assert emb.shape == (2, EMB_DIM), f"got {emb.shape}"

tests/unit/test_diar_pipeline_smoke.py

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+"""Smoke test for MlxDiarizationPipeline orchestrator.
+
+Mocks all sub-components so no HF downloads or real inference is needed.
+30 s of silence → powerset returns all zeros → no active speaker slots → empty annotation.
+"""
+import numpy as np
+import mlx.core as mx
+from unittest.mock import MagicMock
+from pyannote_diarization_3_1_mlx.pipeline import MlxDiarizationPipeline
+
+
+def test_pipeline_smoke_on_30s_zeros(mocker):
+    p = MlxDiarizationPipeline.__new__(MlxDiarizationPipeline)
+    p._segmentation = MagicMock()
+    p._embedding = MagicMock()
+    # mock seg → all class 0 (silence) → no slots → empty annotation
+    p._segmentation.return_value = mx.zeros((1, 589, 7))
+    p._powerset = MagicMock()
+    p._powerset.to_multilabel.return_value = mx.zeros((589, 3))
+    p._embedding.return_value = mx.ones((1, 256))
+    # 30 s of silence
+    audio = np.zeros(30 * 16000, dtype=np.float32)
+    annotation = p({"waveform": mx.array(audio)[None, :], "sample_rate": 16000})
+    # silence → no turns
+    assert len(list(annotation.itertracks())) == 0

tests/unit/test_diar_powerset.py

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+import numpy as np
+import mlx.core as mx
+from pyannote_diarization_3_1_mlx.powerset import Powerset, POWERSET_3_2_MAPPING
+
+
+def test_static_mapping_matches_pyannote():
+    assert POWERSET_3_2_MAPPING.shape == (7, 3)
+    expected = np.array([
+        [0, 0, 0],
+        [1, 0, 0],
+        [0, 1, 0],
+        [0, 0, 1],
+        [1, 1, 0],
+        [1, 0, 1],
+        [0, 1, 1],
+    ], dtype=np.float32)
+    np.testing.assert_array_equal(POWERSET_3_2_MAPPING, expected)
+
+
+def test_to_multilabel_hard_argmax():
+    p = Powerset()
+    # frame 0 → class 1 (S1 only), frame 1 → class 4 (S1+S2), frame 2 → class 0
+    logits = mx.array([
+        [0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+        [0.0, 0.0, 0.0, 0.0, 5.0, 0.0, 0.0],
+        [5.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+    ])
+    out = p.to_multilabel(logits)
+    out_np = np.asarray(out)
+    np.testing.assert_array_equal(out_np[0], [1, 0, 0])
+    np.testing.assert_array_equal(out_np[1], [1, 1, 0])
+    np.testing.assert_array_equal(out_np[2], [0, 0, 0])
+
+
+def test_to_multilabel_shape():
+    p = Powerset()
+    logits = mx.zeros((589, 7))
+    out = p.to_multilabel(logits)
+    assert out.shape == (589, 3)

tests/unit/test_diar_segmentation_load.py

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+"""Unit test: load SegmentationModel weights from HF mlx-community repo."""
+import pytest
+from pyannote_diarization_3_1_mlx.segmentation import SegmentationModel
+
+
+@pytest.mark.integration
+def test_segmentation_loads_from_hf():
+    m = SegmentationModel.from_hf()
+    assert m is not None

tests/unit/test_diar_segmentation_shape.py

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+import mlx.core as mx
+from pyannote_diarization_3_1_mlx.segmentation import SegmentationModel
+
+
+def test_segmentation_full_shape():
+    m = SegmentationModel()
+    x = mx.zeros((1, 1, 160000))  # 10s @ 16k mono
+    out = m(x)
+    assert out.shape == (1, 589, 7), f"got {out.shape}"

tests/unit/test_diar_sincnet.py

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+import mlx.core as mx
+from pyannote_diarization_3_1_mlx._sincnet import SincNet
+
+
+def test_sincnet_output_shape_589_frames():
+    """For pyannote 3.1, 10s @ 16kHz input → 589 frames out."""
+    net = SincNet(sample_rate=16000)
+    x = mx.zeros((1, 1, 16000 * 10))  # (B, C, T)
+    out = net(x)
+    # Expect (1, 60, 589) per upstream PyanNet.SincNet output
+    assert out.shape[-1] == 589, f"got frames={out.shape[-1]}"
+    assert out.shape[1] == 60, f"got channels={out.shape[1]}"

tests/unit/test_diar_window.py

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+from pyannote_diarization_3_1_mlx._window import sliding_windows
+import numpy as np
+
+
+def test_sliding_windows_full_coverage():
+    sr = 16000
+    audio = np.zeros(int(25 * sr), dtype=np.float32)
+    windows = list(sliding_windows(audio, sr=sr, duration_s=10.0, hop_s=1.0))
+    # Expect (25-10)/1 + 1 = 16 windows, all 10 s long
+    assert len(windows) == 16
+    for start, end, slice_ in windows:
+        assert end - start == 10.0
+        assert len(slice_) == 10 * sr
+    # boundaries
+    assert windows[0][0] == 0.0
+    assert windows[-1][1] == 25.0