Glossary

Glossary

Term	Meaning in A2M
Attribute model	ONNX component that predicts velocity and refined onset/offset attributes for decoded intervals
Batch	Number of overlapping audio sections sent through the scorer together
CPU provider	ONNX Runtime execution on the processor
CUDA	NVIDIA GPU execution provider used by the managed CUDA runtime
DirectML	Windows GPU execution provider used by A2M's DirectML runtime
F1	Harmonic mean of precision and recall; balances extra and missed events
Frontend	Analysis windows and mel filter data used to turn waveform frames into model input
Hop	Sample or time step between adjacent analysis frames or sections
Inference	Running model inputs through an ONNX model to obtain outputs
Mel feature	Frequency representation grouped on a perceptually motivated scale
MIDI	Symbolic event format containing notes, timing, velocity, and controllers rather than sound
Note onset	Start time of a note
Note offset	End time of a note
ONNX Runtime	Runtime used to execute A2M's scorer and attribute ONNX models
Precision	Fraction of matched output events among all output events under a stated matching rule
Provider	ONNX Runtime backend such as CPU, CUDA, or DirectML
Recall	Fraction of reference events matched by output events under a stated matching rule
Runtime pack	Provider-specific ONNX Runtime files managed separately from the main app
Scorer	ONNX component that scores possible event intervals, skip/noise paths, and context
Section	Overlapping portion of the recording processed by the engine
Velocity	MIDI value from 1 to 127 representing note attack strength in the output
Viterbi decoding	Dynamic-programming search that selects a high-scoring sequence of event intervals