Allow loading predictions in different formats

src/batdetect2/api_v2.py

@@ -304,8 +304,20 @@ class BatDetect2API:
     def load_predictions(
         self,
         path: data.PathLike,
-    ) -> list[ClipDetections]:
-        return self.formatter.load(path)
+        format: str | None = None,
+        config: OutputFormatConfig | None = None,
+    ) -> list[object]:
+        formatter = self.formatter
+
+        if format is not None or config is not None:
+            format = format or config.name  # type: ignore
+            formatter = get_output_formatter(
+                name=format,
+                targets=self.targets,
+                config=config,
+            )
+
+        return formatter.load(path)
 
     @classmethod
     def from_config(

tests/test_api_v2/test_api_v2.py

@@ -0,0 +1,115 @@
+from pathlib import Path
+
+import numpy as np
+import pytest
+import torch
+from soundevent.geometry import compute_bounds
+
+from batdetect2.api_v2 import BatDetect2API
+from batdetect2.config import BatDetect2Config
+
+
+@pytest.fixture
+def api_v2() -> BatDetect2API:
+    """User story: users can create a ready-to-use API from config."""
+
+    config = BatDetect2Config()
+    config.inference.loader.batch_size = 2
+    return BatDetect2API.from_config(config)
+
+
+def test_process_file_returns_recording_level_predictions(
+    api_v2: BatDetect2API,
+    example_audio_files: list[Path],
+) -> None:
+    """User story: process a file and get detections in recording time."""
+
+    prediction = api_v2.process_file(example_audio_files[0])
+
+    assert prediction.clip.recording.path == example_audio_files[0]
+    assert prediction.clip.start_time == 0
+    assert prediction.clip.end_time == prediction.clip.recording.duration
+
+    for detection in prediction.detections:
+        start, low, end, high = compute_bounds(detection.geometry)
+        assert 0 <= start <= end <= prediction.clip.recording.duration
+        assert prediction.clip.recording.samplerate > 2 * low
+        assert prediction.clip.recording.samplerate > 2 * high
+        assert detection.class_scores.shape[0] == len(
+            api_v2.targets.class_names
+        )
+
+
+def test_process_files_is_batch_size_invariant(
+    api_v2: BatDetect2API,
+    example_audio_files: list[Path],
+) -> None:
+    """User story: changing batch size should not change predictions."""
+
+    preds_batch_1 = api_v2.process_files(example_audio_files, batch_size=1)
+    preds_batch_3 = api_v2.process_files(example_audio_files, batch_size=3)
+
+    assert len(preds_batch_1) == len(preds_batch_3)
+
+    by_key_1 = {
+        (
+            str(pred.clip.recording.path),
+            pred.clip.start_time,
+            pred.clip.end_time,
+        ): pred
+        for pred in preds_batch_1
+    }
+    by_key_3 = {
+        (
+            str(pred.clip.recording.path),
+            pred.clip.start_time,
+            pred.clip.end_time,
+        ): pred
+        for pred in preds_batch_3
+    }
+
+    assert set(by_key_1) == set(by_key_3)
+
+    for key in by_key_1:
+        pred_1 = by_key_1[key]
+        pred_3 = by_key_3[key]
+        assert pred_1.clip.start_time == pred_3.clip.start_time
+        assert pred_1.clip.end_time == pred_3.clip.end_time
+        assert len(pred_1.detections) == len(pred_3.detections)
+
+
+def test_process_audio_matches_process_spectrogram(
+    api_v2: BatDetect2API,
+    example_audio_files: list[Path],
+) -> None:
+    """User story: users can call either audio or spectrogram entrypoint."""
+
+    audio = api_v2.load_audio(example_audio_files[0])
+    from_audio = api_v2.process_audio(audio)
+
+    spec = api_v2.generate_spectrogram(audio)
+    from_spec = api_v2.process_spectrogram(spec)
+
+    assert len(from_audio) == len(from_spec)
+
+    for det_audio, det_spec in zip(from_audio, from_spec, strict=True):
+        bounds_audio = np.array(compute_bounds(det_audio.geometry))
+        bounds_spec = np.array(compute_bounds(det_spec.geometry))
+        np.testing.assert_allclose(bounds_audio, bounds_spec, atol=1e-6)
+        assert np.isclose(det_audio.detection_score, det_spec.detection_score)
+        np.testing.assert_allclose(
+            det_audio.class_scores,
+            det_spec.class_scores,
+            atol=1e-6,
+        )
+
+
+def test_process_spectrogram_rejects_batched_input(
+    api_v2: BatDetect2API,
+) -> None:
+    """User story: invalid batched input gives a clear error."""
+
+    spec = torch.zeros((2, 1, 128, 64), dtype=torch.float32)
+
+    with pytest.raises(ValueError, match="Batched spectrograms not supported"):
+        api_v2.process_spectrogram(spec)

tests/test_api_v2/test_outputs_io.py

@@ -0,0 +1,123 @@
+from pathlib import Path
+from typing import cast
+
+import numpy as np
+import pytest
+
+from batdetect2.api_v2 import BatDetect2API
+from batdetect2.config import BatDetect2Config
+from batdetect2.outputs import build_output_formatter
+from batdetect2.outputs.formats import (
+    BatDetect2OutputConfig,
+    SoundEventOutputConfig,
+)
+from batdetect2.postprocess.types import ClipDetections
+
+
+@pytest.fixture
+def api_v2() -> BatDetect2API:
+    """User story: API object manages prediction IO formats."""
+
+    return BatDetect2API.from_config(BatDetect2Config())
+
+
+@pytest.fixture
+def file_prediction(api_v2: BatDetect2API, example_audio_files: list[Path]):
+    """User story: users save/load predictions produced by API inference."""
+
+    return api_v2.process_file(example_audio_files[0])
+
+
+def test_save_and_load_predictions_roundtrip_default_raw(
+    api_v2: BatDetect2API,
+    file_prediction,
+    tmp_path: Path,
+) -> None:
+    output_dir = tmp_path / "raw_preds"
+    api_v2.save_predictions([file_prediction], path=output_dir)
+    loaded = cast(list[ClipDetections], api_v2.load_predictions(output_dir))
+
+    assert len(loaded) == 1
+    loaded_prediction = loaded[0]
+    assert loaded_prediction.clip == file_prediction.clip
+    assert len(loaded_prediction.detections) == len(file_prediction.detections)
+
+    for loaded_det, det in zip(
+        loaded_prediction.detections,
+        file_prediction.detections,
+        strict=True,
+    ):
+        assert loaded_det.geometry == det.geometry
+        assert np.isclose(loaded_det.detection_score, det.detection_score)
+        np.testing.assert_allclose(
+            loaded_det.class_scores,
+            det.class_scores,
+            atol=1e-6,
+        )
+
+
+def test_save_predictions_with_batdetect2_override(
+    api_v2: BatDetect2API,
+    file_prediction,
+    tmp_path: Path,
+) -> None:
+    output_dir = tmp_path / "batdetect2_preds"
+    api_v2.save_predictions(
+        [file_prediction],
+        path=output_dir,
+        format="batdetect2",
+    )
+
+    formatter = build_output_formatter(
+        targets=api_v2.targets,
+        config=BatDetect2OutputConfig(),
+    )
+    loaded = formatter.load(output_dir)
+
+    assert len(loaded) == 1
+    assert "annotation" in loaded[0]
+    assert len(loaded[0]["annotation"]) == len(file_prediction.detections)
+
+
+def test_load_predictions_with_format_override(
+    api_v2: BatDetect2API,
+    file_prediction,
+    tmp_path: Path,
+) -> None:
+    output_dir = tmp_path / "batdetect2_preds_load"
+    api_v2.save_predictions(
+        [file_prediction],
+        path=output_dir,
+        format="batdetect2",
+    )
+
+    loaded = api_v2.load_predictions(output_dir, format="batdetect2")
+
+    assert len(loaded) == 1
+    loaded_item = loaded[0]
+    assert isinstance(loaded_item, dict)
+    assert "annotation" in loaded_item
+
+
+def test_save_predictions_with_soundevent_override(
+    api_v2: BatDetect2API,
+    file_prediction,
+    tmp_path: Path,
+) -> None:
+    output_path = tmp_path / "soundevent_preds"
+    api_v2.save_predictions(
+        [file_prediction],
+        path=output_path,
+        format="soundevent",
+    )
+
+    formatter = build_output_formatter(
+        targets=api_v2.targets,
+        config=SoundEventOutputConfig(),
+    )
+    load_path = output_path.with_suffix(".json")
+    loaded = formatter.load(load_path)
+
+    assert load_path.exists()
+    assert len(loaded) == 1
+    assert len(loaded[0].sound_events) == len(file_prediction.detections)

tests/test_inference/test_clips.py

@@ -0,0 +1,25 @@
+from soundevent import data
+
+from batdetect2.inference.clips import get_recording_clips
+
+
+def test_get_recording_clips_uses_requested_duration(create_recording) -> None:
+    recording = create_recording(duration=2.0, samplerate=256_000)
+
+    clips = get_recording_clips(
+        recording,
+        duration=0.5,
+        overlap=0.0,
+        discard_empty=False,
+    )
+
+    assert len(clips) == 4
+    assert all(isinstance(clip, data.Clip) for clip in clips)
+    assert clips[0].start_time == 0.0
+    assert clips[0].end_time == 0.5
+    assert clips[1].start_time == 0.5
+    assert clips[1].end_time == 1.0
+    assert clips[2].start_time == 1.0
+    assert clips[2].end_time == 1.5
+    assert clips[3].start_time == 1.5
+    assert clips[3].end_time == 2.0