app.py

import streamlit as st
import streamlit_pianoroll
from fortepyan import MidiPiece

from datasets import load_dataset


def main():

    available_datasets = [
        "pijamia-midi-v1",
        "lakh-lmd-full",
        "giant-midi-sustain-v2",
        "maestro-sustain-v2",
    ]
    dataset_name = st.selectbox(
        label="Select dataset",
        options=available_datasets,
    )
    preview_dataset(dataset_name)


def preview_dataset(dataset_name: str):
    dataset = load_dataset(f"epr-labs/{dataset_name}", split="train[100:200]")

    st.write(f"### Dataset: {dataset_name}")

    st.write(f"""
    Number of records: {len(dataset)}
    """)
    code = f"""
    dataset = load_dataset("epr-labs/{dataset_name}", split="train")

    record = dataset[321]
    piece = MidiPiece.from_huggingface(record)

    # Playback in streamlit
    streamlit_pianoroll.from_fortepyan(piece)
    """
    st.code(code, language="python")

    record_idx = st.number_input(
        label="record id",
        min_value=0,
        max_value=len(dataset) - 1,
        value=50,
    )

    record = dataset[record_idx]
    piece = MidiPiece.from_huggingface(record)
    # TODO Improve fortepyan to make this cleaner
    piece.time_shift(-piece.df.start.min())

    streamlit_pianoroll.from_fortepyan(piece)

    st.write("#### Piece metadata")
    st.json(piece.source)


if __name__ == "__main__":
    main()