coremlit 0.1.0

Safe, synchronous CoreML runtime for macOS (CPU/GPU/Neural Engine) with opt-in on-device multimodal pipelines: speech (Whisper STT, forced alignment, speaker diarization, Silero VAD), AudioSet sound-event tagging, and audio/text/image embeddings (CLAP, granite, SigLIP)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236

use super::*;
use crate::audio::whisper::backend::{BackendError, InferenceBackend, ModelDims};

fn tiny_mock(tokens: &[u32]) -> MockBackend {
  let mut mock = MockBackend::new().with_dims(ModelDims::new().with_vocab(100).with_n_audio_ctx(4));
  mock.push_token_steps(tokens);
  mock
}

#[test]
fn scripted_steps_replay_in_order_and_record_positions() {
  let mock = tiny_mock(&[7, 9]);
  let features = mock.extract_features(&[0.0; 16]).unwrap();
  let encoded = mock.encode(&features).unwrap();
  let mut state = mock.new_decoder_state().unwrap();
  let mut logits = Vec::new();

  mock
    .decode_step(50258, 0, &encoded, &mut state, &mut logits)
    .unwrap();
  assert_eq!(logits.len(), 100);
  assert_eq!(logits[7], 10.0);
  mock
    .decode_step(7, 1, &encoded, &mut state, &mut logits)
    .unwrap();
  assert_eq!(logits[9], 10.0);
  assert_eq!(state.consumed_slice(), &[(50258, 0), (7, 1)]);

  // Script exhausted -> structured error, not silence.
  let err = mock
    .decode_step(9, 2, &encoded, &mut state, &mut logits)
    .unwrap_err();
  assert!(matches!(err, BackendError::ScriptExhausted(2)));
}

#[test]
fn reset_replays_script_and_counts() {
  let mock = tiny_mock(&[7]);
  let encoded = mock
    .encode(&mock.extract_features(&[0.0; 4]).unwrap())
    .unwrap();
  let mut state = mock.new_decoder_state().unwrap();
  let mut logits = Vec::new();
  mock
    .decode_step(1, 0, &encoded, &mut state, &mut logits)
    .unwrap();
  mock.reset_decoder_state(&mut state);
  mock
    .decode_step(1, 0, &encoded, &mut state, &mut logits)
    .unwrap();
  assert_eq!(logits[7], 10.0);
  let counters = mock.counters();
  assert_eq!(counters.decode_steps(), 2);
  assert_eq!(counters.resets(), 1);
  assert_eq!(counters.encode_calls(), 1);
}

#[test]
fn alignment_rows_accumulate_at_position_plus_one() {
  // Stage/commit split (whisper #41): a step alone STAGES its row and leaves
  // the `hasAlignment` gate shut (view `None`, TextDecoder.swift:764-771);
  // the following `commit_alignment_row` lands the slice at row
  // `position + 1` (TextDecoder.swift:286, :709-717) and opens the gate.
  let mut mock = MockBackend::new().with_dims(ModelDims::new().with_vocab(10).with_n_audio_ctx(3));
  mock.push_step_with_alignment(vec![0.0; 10], vec![0.5, 0.6, 0.7]);
  let encoded = mock
    .encode(&mock.extract_features(&[0.0; 4]).unwrap())
    .unwrap();
  let mut state = mock.new_decoder_state().unwrap();
  let mut logits = Vec::new();
  mock
    .decode_step(1, 0, &encoded, &mut state, &mut logits)
    .unwrap();
  assert!(
    mock.alignment_weights(&state).is_none(),
    "staging alone must not open the gate"
  );
  mock.commit_alignment_row(&mut state);
  let view = mock
    .alignment_weights(&state)
    .expect("commit opens the hasAlignment gate");
  assert_eq!(view.row(1), &[0.5, 0.6, 0.7]);
  assert_eq!(view.row(0), &[0.0, 0.0, 0.0], "row 0 is never written");
}

#[test]
fn full_token_budget_reaches_last_position_without_panicking() {
  // Regression (task-2 review, Critical): the last legal position is
  // `max_token_context - 1`, and its committed alignment row lands at row
  // `position + 1` — stepping there and committing must neither panic in
  // `decode_step`/`commit_alignment_row` nor in `alignment_weights`.
  let dims = ModelDims::new()
    .with_vocab(8)
    .with_max_token_context(4)
    .with_n_audio_ctx(3);
  let mut mock = MockBackend::new().with_dims(dims);
  for _ in 0..dims.max_token_context() - 1 {
    mock.push_step(vec![0.0; dims.vocab()]);
  }
  mock.push_step_with_alignment(vec![0.0; dims.vocab()], vec![0.5; dims.n_audio_ctx()]);
  let encoded = mock
    .encode(&mock.extract_features(&[0.0; 16]).unwrap())
    .unwrap();
  let mut state = mock.new_decoder_state().unwrap();
  let mut logits = Vec::new();
  for position in 0..dims.max_token_context() {
    mock
      .decode_step(0, position, &encoded, &mut state, &mut logits)
      .unwrap();
    mock.commit_alignment_row(&mut state);
    assert_eq!(logits.len(), dims.vocab());
  }
  let view = mock
    .alignment_weights(&state)
    .expect("the last step's committed row opened the gate");
  // Fixed-size view: `rows == max_token_context + 1` always, and the
  // headroom row is reachable without a panic.
  assert_eq!(view.rows(), dims.max_token_context() + 1);
  assert_eq!(view.row(dims.max_token_context()), &[0.5, 0.5, 0.5]);
}

#[test]
fn steps_without_alignment_rows_keep_the_has_alignment_gate_shut() {
  // The `hasAlignment` gate (TextDecoder.swift:568,711,764-771): a window
  // whose committed steps carry no alignment row yields no view at all; the
  // first committed real row flips the gate open. Recast from the old
  // "extend the view" pin — the view is fixed-size now, so presence is the
  // gate, not the row count.
  let dims = ModelDims::new().with_vocab(4).with_n_audio_ctx(2);
  let mut mock = MockBackend::new().with_dims(dims);
  mock.push_step(vec![0.0; 4]);
  mock.push_step_with_alignment(vec![0.0; 4], vec![0.7, 0.7]);
  let encoded = mock
    .encode(&mock.extract_features(&[0.0; 4]).unwrap())
    .unwrap();
  let mut state = mock.new_decoder_state().unwrap();
  let mut logits = Vec::new();
  mock
    .decode_step(0, 0, &encoded, &mut state, &mut logits)
    .unwrap();
  mock.commit_alignment_row(&mut state);
  assert!(
    mock.alignment_weights(&state).is_none(),
    "a rowless committed step keeps the gate shut"
  );
  mock
    .decode_step(0, 1, &encoded, &mut state, &mut logits)
    .unwrap();
  mock.commit_alignment_row(&mut state);
  let view = mock
    .alignment_weights(&state)
    .expect("the committed real row opened the gate");
  assert_eq!(view.rows(), dims.max_token_context() + 1);
  assert_eq!(view.row(2), &[0.7, 0.7]);
}

#[test]
fn a_committed_row_survives_reset_as_stale_data() {
  // Reset deliberately leaves the accumulator (Swift's once-allocated
  // tensor, Models.swift:312-322 / TextDecoder.swift:141), so a later,
  // shorter window reads an earlier window's committed row wherever its own
  // steps never reached (whisper #41). Continuous-script mode keeps the
  // cursor across reset so the two windows script different rows.
  let dims = ModelDims::new().with_vocab(4).with_n_audio_ctx(2);
  let mut mock = MockBackend::new().with_dims(dims).with_continuous_script();
  mock.push_step_with_alignment(vec![0.0; 4], vec![9.0, 9.0]);
  mock.push_step_with_alignment(vec![0.0; 4], vec![1.0, 1.0]);
  let encoded = mock
    .encode(&mock.extract_features(&[0.0; 4]).unwrap())
    .unwrap();
  let mut state = mock.new_decoder_state().unwrap();
  let mut logits = Vec::new();

  // Window 1 commits a row high up (row 3).
  mock
    .decode_step(0, 2, &encoded, &mut state, &mut logits)
    .unwrap();
  mock.commit_alignment_row(&mut state);
  assert_eq!(mock.alignment_weights(&state).unwrap().row(3), &[9.0, 9.0]);

  // The fallback/next-window reset shuts the gate but keeps the buffer.
  mock.reset_decoder_state(&mut state);
  assert!(
    mock.alignment_weights(&state).is_none(),
    "reset shuts the hasAlignment gate"
  );

  // Window 2 commits only row 1; it never touches row 3.
  mock
    .decode_step(0, 0, &encoded, &mut state, &mut logits)
    .unwrap();
  mock.commit_alignment_row(&mut state);
  let view = mock.alignment_weights(&state).unwrap();
  assert_eq!(view.row(1), &[1.0, 1.0], "window 2's own committed row");
  assert_eq!(
    view.row(3),
    &[9.0, 9.0],
    "window 1's row survived reset as stale data"
  );
}

#[test]
fn a_staged_but_uncommitted_row_is_dropped_by_reset() {
  // A completing step stages its row but the decode loop never commits it
  // (Swift breaks before :709-717): the row must not leak into a later
  // window. Continuous-script mode gives the later window a real committed
  // row so its view opens, exposing the dropped slot as the initial zero.
  let dims = ModelDims::new().with_vocab(4).with_n_audio_ctx(2);
  let mut mock = MockBackend::new().with_dims(dims).with_continuous_script();
  mock.push_step_with_alignment(vec![0.0; 4], vec![9.0, 9.0]);
  mock.push_step_with_alignment(vec![0.0; 4], vec![1.0, 1.0]);
  let encoded = mock
    .encode(&mock.extract_features(&[0.0; 4]).unwrap())
    .unwrap();
  let mut state = mock.new_decoder_state().unwrap();
  let mut logits = Vec::new();

  // Window 1 stages a row at position 2 (would be row 3) but never commits.
  mock
    .decode_step(0, 2, &encoded, &mut state, &mut logits)
    .unwrap();
  mock.reset_decoder_state(&mut state);

  // Window 2 commits row 1, opening the gate.
  mock
    .decode_step(0, 0, &encoded, &mut state, &mut logits)
    .unwrap();
  mock.commit_alignment_row(&mut state);
  let view = mock.alignment_weights(&state).unwrap();
  assert_eq!(view.row(1), &[1.0, 1.0]);
  assert_eq!(
    view.row(3),
    &[0.0, 0.0],
    "the staged-but-uncommitted row never landed"
  );
}