app_onnx.py

import argparse
import glob
import json
import os.path
import time
from concurrent.futures import ThreadPoolExecutor
from pathlib import Path
from sys import exit

import gradio as gr
import numpy as np
import onnxruntime as rt
import requests
import tqdm
from packaging import version

import MIDI
from midi_synthesizer import MidiSynthesizer
from midi_tokenizer import MIDITokenizer

VERSION = "v1.3.3"
MAX_SEED = np.iinfo(np.int32).max

rt.set_default_logger_severity(3)


def softmax(x, axis):
    x_max = np.amax(x, axis=axis, keepdims=True)
    exp_x_shifted = np.exp(x - x_max)
    return exp_x_shifted / np.sum(exp_x_shifted, axis=axis, keepdims=True)


def sample_top_p_k(probs, p, k, generator=None):
    if generator is None:
        generator = np.random
    probs_idx = np.argsort(-probs, axis=-1)
    probs_sort = np.take_along_axis(probs, probs_idx, -1)
    probs_sum = np.cumsum(probs_sort, axis=-1)
    mask = probs_sum - probs_sort > p
    probs_sort[mask] = 0.0
    mask = np.zeros(probs_sort.shape[-1])
    mask[:k] = 1
    probs_sort = probs_sort * mask
    probs_sort /= np.sum(probs_sort, axis=-1, keepdims=True)
    shape = probs_sort.shape
    probs_sort_flat = probs_sort.reshape(-1, shape[-1])
    probs_idx_flat = probs_idx.reshape(-1, shape[-1])
    next_token = np.stack([generator.choice(idxs, p=pvals) for pvals, idxs in zip(probs_sort_flat, probs_idx_flat)])
    next_token = next_token.reshape(*shape[:-1])
    return next_token

def apply_io_binding(model: rt.InferenceSession, inputs, outputs, batch_size, past_len, cur_len):
    io_binding = model.io_binding()
    for input_ in  model.get_inputs():
        name = input_.name
        if name.startswith("past_key_values"):
            present_name = name.replace("past_key_values", "present")
            if present_name in outputs:
                v = outputs[present_name]
            else:
                v = rt.OrtValue.ortvalue_from_shape_and_type(
                    (batch_size, input_.shape[1], past_len, input_.shape[3]),
                    element_type=np.float32,
                    device_type=device)
            inputs[name] = v
        else:
            v = inputs[name]
        io_binding.bind_ortvalue_input(name, v)

    for output in model.get_outputs():
        name = output.name
        if name.startswith("present"):
            v = rt.OrtValue.ortvalue_from_shape_and_type(
                (batch_size, output.shape[1], cur_len, output.shape[3]),
                element_type=np.float32,
                device_type=device)
            outputs[name] = v
        else:
            v = outputs[name]
        io_binding.bind_ortvalue_output(name, v)
    return io_binding

def generate(model, prompt=None, batch_size=1, max_len=512, temp=1.0, top_p=0.98, top_k=20,
             disable_patch_change=False, disable_control_change=False, disable_channels=None, generator=None):
    tokenizer = model[2]
    if disable_channels is not None:
        disable_channels = [tokenizer.parameter_ids["channel"][c] for c in disable_channels]
    else:
        disable_channels = []
    if generator is None:
        generator = np.random
    max_token_seq = tokenizer.max_token_seq
    if prompt is None:
        input_tensor = np.full((1, max_token_seq), tokenizer.pad_id, dtype=np.int64)
        input_tensor[0, 0] = tokenizer.bos_id  # bos
        input_tensor = input_tensor[None, :, :]
        input_tensor = np.repeat(input_tensor, repeats=batch_size, axis=0)
    else:
        if len(prompt.shape) == 2:
            prompt = prompt[None, :]
            prompt = np.repeat(prompt, repeats=batch_size, axis=0)
        elif prompt.shape[0] == 1:
            prompt = np.repeat(prompt, repeats=batch_size, axis=0)
        elif len(prompt.shape) != 3 or prompt.shape[0] != batch_size:
            raise ValueError(f"invalid shape for prompt, {prompt.shape}")
        prompt = prompt[..., :max_token_seq]
        if prompt.shape[-1] < max_token_seq:
            prompt = np.pad(prompt, ((0, 0), (0, 0), (0, max_token_seq - prompt.shape[-1])),
                            mode="constant", constant_values=tokenizer.pad_id)
        input_tensor = prompt
    cur_len = input_tensor.shape[1]
    bar = tqdm.tqdm(desc="generating", total=max_len - cur_len)
    model0_inputs = {}
    model0_outputs = {}
    emb_size = 1024
    for output in model[0].get_outputs():
        if output.name == "hidden":
            emb_size = output.shape[2]
    past_len = 0
    with bar:
        while cur_len < max_len:
            end = [False] * batch_size
            model0_inputs["x"] = rt.OrtValue.ortvalue_from_numpy(input_tensor[:, past_len:], device_type=device)
            model0_outputs["hidden"] = rt.OrtValue.ortvalue_from_shape_and_type(
                (batch_size, cur_len - past_len, emb_size),
                element_type=np.float32,
                device_type=device)
            io_binding = apply_io_binding(model[0], model0_inputs, model0_outputs, batch_size, past_len, cur_len)
            io_binding.synchronize_inputs()
            model[0].run_with_iobinding(io_binding)
            io_binding.synchronize_outputs()

            hidden = model0_outputs["hidden"].numpy()[:, -1:]
            next_token_seq = np.zeros((batch_size, 0), dtype=np.int64)
            event_names = [""] * batch_size
            model1_inputs = {"hidden": rt.OrtValue.ortvalue_from_numpy(hidden, device_type=device)}
            model1_outputs = {}
            for i in range(max_token_seq):
                mask = np.zeros((batch_size, tokenizer.vocab_size), dtype=np.int64)
                for b in range(batch_size):
                    if end[b]:
                        mask[b, tokenizer.pad_id] = 1
                        continue
                    if i == 0:
                        mask_ids = list(tokenizer.event_ids.values()) + [tokenizer.eos_id]
                        if disable_patch_change:
                            mask_ids.remove(tokenizer.event_ids["patch_change"])
                        if disable_control_change:
                            mask_ids.remove(tokenizer.event_ids["control_change"])
                        mask[b, mask_ids] = 1
                    else:
                        param_names = tokenizer.events[event_names[b]]
                        if i > len(param_names):
                            mask[b, tokenizer.pad_id] = 1
                            continue
                        param_name = param_names[i - 1]
                        mask_ids = tokenizer.parameter_ids[param_name]
                        if param_name == "channel":
                            mask_ids = [i for i in mask_ids if i not in disable_channels]
                        mask[b, mask_ids] = 1
                mask = mask[:, None, :]
                x = next_token_seq
                if i != 0:
                    # cached
                    if i == 1:
                        hidden = np.zeros((batch_size, 0, emb_size), dtype=np.float32)
                        model1_inputs["hidden"] = rt.OrtValue.ortvalue_from_numpy(hidden, device_type=device)
                    x = x[:, -1:]
                model1_inputs["x"] = rt.OrtValue.ortvalue_from_numpy(x, device_type=device)
                model1_outputs["y"] = rt.OrtValue.ortvalue_from_shape_and_type(
                    (batch_size, 1, tokenizer.vocab_size),
                    element_type=np.float32,
                    device_type=device
                )
                io_binding = apply_io_binding(model[1], model1_inputs, model1_outputs, batch_size, i, i+1)
                io_binding.synchronize_inputs()
                model[1].run_with_iobinding(io_binding)
                io_binding.synchronize_outputs()
                logits = model1_outputs["y"].numpy()
                scores = softmax(logits / temp, -1) * mask
                samples = sample_top_p_k(scores, top_p, top_k, generator)
                if i == 0:
                    next_token_seq = samples
                    for b in range(batch_size):
                        if end[b]:
                            continue
                        eid = samples[b].item()
                        if eid == tokenizer.eos_id:
                            end[b] = True
                        else:
                            event_names[b] = tokenizer.id_events[eid]
                else:
                    next_token_seq = np.concatenate([next_token_seq, samples], axis=1)
                    if all([len(tokenizer.events[event_names[b]]) == i for b in range(batch_size) if not end[b]]):
                        break
            if next_token_seq.shape[1] < max_token_seq:
                next_token_seq = np.pad(next_token_seq,
                                        ((0, 0), (0, max_token_seq - next_token_seq.shape[-1])),
                                        mode="constant", constant_values=tokenizer.pad_id)
            next_token_seq = next_token_seq[:, None, :]
            input_tensor = np.concatenate([input_tensor, next_token_seq], axis=1)
            past_len = cur_len
            cur_len += 1
            bar.update(1)
            yield next_token_seq[:, 0]
            if all(end):
                break


def create_msg(name, data):
    return {"name": name, "data": data}


def send_msgs(msgs):
    return json.dumps(msgs)


def run(model_name, tab, mid_seq, continuation_state, continuation_select, instruments, drum_kit, bpm, time_sig,
        key_sig, mid, midi_events, reduce_cc_st, remap_track_channel, add_default_instr, remove_empty_channels,
        seed, seed_rand, gen_events, temp, top_p, top_k, allow_cc):
    global current_model, model_base, model_token, tokenizer
    if current_model != model_name:
        gr.Info("Loading model...")
        model_info = models_info[model_name]
        model_config = model_info[0]
        model_base_path, model_base_url = model_info[1]
        model_token_path, model_token_url = model_info[2]
        try:
            download_if_not_exit(model_base_url, model_base_path)
            download_if_not_exit(model_token_url, model_token_path)
        except Exception as e:
            print(e)
            raise gr.Error("Failed to download files.")
        try:
            model_base = rt.InferenceSession(model_base_path, providers=providers)
            model_token = rt.InferenceSession(model_token_path, providers=providers)
            tokenizer = get_tokenizer(model_config)
            current_model = model_name
            gr.Info("Model loaded")
        except Exception as e:
            print(e)
            raise gr.Error("Failed to load models, maybe you need to delete them and re-download it.")

    bpm = int(bpm)
    if time_sig == "auto":
        time_sig = None
        time_sig_nn = 4
        time_sig_dd = 2
    else:
        time_sig_nn, time_sig_dd = time_sig.split('/')
        time_sig_nn = int(time_sig_nn)
        time_sig_dd = {2: 1, 4: 2, 8: 3}[int(time_sig_dd)]
    if key_sig == 0:
        key_sig = None
        key_sig_sf = 0
        key_sig_mi = 0
    else:
        key_sig = (key_sig - 1)
        key_sig_sf = key_sig // 2 - 7
        key_sig_mi = key_sig % 2
    gen_events = int(gen_events)
    max_len = gen_events
    if seed_rand:
        seed = np.random.randint(0, MAX_SEED)
    generator = np.random.RandomState(seed)
    disable_patch_change = False
    disable_channels = None
    if tab == 0:
        i = 0
        mid = [[tokenizer.bos_id] + [tokenizer.pad_id] * (tokenizer.max_token_seq - 1)]
        if tokenizer.version == "v2":
            if time_sig is not None:
                mid.append(tokenizer.event2tokens(["time_signature", 0, 0, 0, time_sig_nn - 1, time_sig_dd - 1]))
            if key_sig is not None:
                mid.append(tokenizer.event2tokens(["key_signature", 0, 0, 0, key_sig_sf + 7, key_sig_mi]))
        if bpm != 0:
            mid.append(tokenizer.event2tokens(["set_tempo", 0, 0, 0, bpm]))
        patches = {}
        if instruments is None:
            instruments = []
        for instr in instruments:
            patches[i] = patch2number[instr]
            i = (i + 1) if i != 8 else 10
        if drum_kit != "None":
            patches[9] = drum_kits2number[drum_kit]
        for i, (c, p) in enumerate(patches.items()):
            mid.append(tokenizer.event2tokens(["patch_change", 0, 0, i + 1, c, p]))
        mid = np.asarray([mid] * OUTPUT_BATCH_SIZE, dtype=np.int64)
        mid_seq = mid.tolist()
        if len(instruments) > 0:
            disable_patch_change = True
            disable_channels = [i for i in range(16) if i not in patches]
    elif tab == 1 and mid is not None:
        eps = 4 if reduce_cc_st else 0
        mid = tokenizer.tokenize(MIDI.midi2score(mid), cc_eps=eps, tempo_eps=eps,
                                 remap_track_channel=remap_track_channel,
                                 add_default_instr=add_default_instr,
                                 remove_empty_channels=remove_empty_channels)
        mid = mid[:int(midi_events)]
        mid = np.asarray([mid] * OUTPUT_BATCH_SIZE, dtype=np.int64)
        mid_seq = mid.tolist()
    elif tab == 2 and mid_seq is not None:
        mid = np.asarray(mid_seq, dtype=np.int64)
        if continuation_select > 0:
            continuation_state.append(mid_seq)
            mid = np.repeat(mid[continuation_select - 1:continuation_select], repeats=OUTPUT_BATCH_SIZE, axis=0)
            mid_seq = mid.tolist()
        else:
            continuation_state.append(mid.shape[1])
    else:
        continuation_state = [0]
        mid = [[tokenizer.bos_id] + [tokenizer.pad_id] * (tokenizer.max_token_seq - 1)]
        mid = np.asarray([mid] * OUTPUT_BATCH_SIZE, dtype=np.int64)
        mid_seq = mid.tolist()

    if mid is not None:
        max_len += mid.shape[1]

    init_msgs = [create_msg("progress", [0, gen_events])]
    if not (tab == 2 and continuation_select == 0):
        for i in range(OUTPUT_BATCH_SIZE):
            events = [tokenizer.tokens2event(tokens) for tokens in mid_seq[i]]
            init_msgs += [create_msg("visualizer_clear", [i, tokenizer.version]),
                          create_msg("visualizer_append", [i, events])]
    yield mid_seq, continuation_state, seed, send_msgs(init_msgs)
    model = (model_base, model_token, tokenizer)
    midi_generator = generate(model, mid, batch_size=OUTPUT_BATCH_SIZE, max_len=max_len, temp=temp,
                              top_p=top_p, top_k=top_k, disable_patch_change=disable_patch_change,
                              disable_control_change=not allow_cc, disable_channels=disable_channels,
                              generator=generator)
    events = [list() for i in range(OUTPUT_BATCH_SIZE)]
    t = time.time()
    for i, token_seqs in enumerate(midi_generator):
        token_seqs = token_seqs.tolist()
        for j in range(OUTPUT_BATCH_SIZE):
            token_seq = token_seqs[j]
            mid_seq[j].append(token_seq)
            events[j].append(tokenizer.tokens2event(token_seq))
        if time.time() - t > 0.2:
            msgs = [create_msg("progress", [i + 1, gen_events])]
            for j in range(OUTPUT_BATCH_SIZE):
                msgs += [create_msg("visualizer_append", [j, events[j]])]
                events[j] = list()
            yield mid_seq, continuation_state, seed, send_msgs(msgs)
            t = time.time()
    yield mid_seq, continuation_state, seed, send_msgs([])


def finish_run(mid_seq):
    if mid_seq is None:
        outputs = [None] * OUTPUT_BATCH_SIZE
        return *outputs, []
    outputs = []
    end_msgs = [create_msg("progress", [0, 0])]
    if not os.path.exists("outputs"):
        os.mkdir("outputs")
    for i in range(OUTPUT_BATCH_SIZE):
        events = [tokenizer.tokens2event(tokens) for tokens in mid_seq[i]]
        mid = tokenizer.detokenize(mid_seq[i])
        with open(f"outputs/output{i + 1}.mid", 'wb') as f:
            f.write(MIDI.score2midi(mid))
        outputs.append(f"outputs/output{i + 1}.mid")
        end_msgs += [create_msg("visualizer_clear", [i, tokenizer.version]),
                     create_msg("visualizer_append", [i, events]),
                     create_msg("visualizer_end", i)]
    return *outputs, send_msgs(end_msgs)


def synthesis_task(mid):
    return synthesizer.synthesis(MIDI.score2opus(mid))

def render_audio(mid_seq, should_render_audio):
    if (not should_render_audio) or mid_seq is None:
        outputs = [None] * OUTPUT_BATCH_SIZE
        return tuple(outputs)
    outputs = []
    if not os.path.exists("outputs"):
        os.mkdir("outputs")
    audio_futures = []
    for i in range(OUTPUT_BATCH_SIZE):
        mid = tokenizer.detokenize(mid_seq[i])
        audio_future = thread_pool.submit(synthesis_task, mid)
        audio_futures.append(audio_future)
    for future in audio_futures:
        outputs.append((44100, future.result()))
    if OUTPUT_BATCH_SIZE == 1:
        return outputs[0]
    return tuple(outputs)


def undo_continuation(mid_seq, continuation_state):
    if mid_seq is None or len(continuation_state) < 2:
        return mid_seq, continuation_state, send_msgs([])
    if isinstance(continuation_state[-1], list):
        mid_seq = continuation_state[-1]
    else:
        mid_seq = [ms[:continuation_state[-1]] for ms in mid_seq]
    continuation_state = continuation_state[:-1]
    end_msgs = [create_msg("progress", [0, 0])]
    for i in range(OUTPUT_BATCH_SIZE):
        events = [tokenizer.tokens2event(tokens) for tokens in mid_seq[i]]
        end_msgs += [create_msg("visualizer_clear", [i, tokenizer.version]),
                     create_msg("visualizer_append", [i, events]),
                     create_msg("visualizer_end", i)]
    return mid_seq, continuation_state, send_msgs(end_msgs)


def download(url, output_file):
    response = requests.get(url, stream=True)
    file_size = int(response.headers.get("Content-Length", 0))
    with tqdm.tqdm(total=file_size, unit="B", unit_scale=True, unit_divisor=1024,
                   desc=f"Downloading {output_file}") as pbar:
        with open(output_file, "wb") as f:
            for chunk in response.iter_content(chunk_size=1024):
                if chunk:
                    f.write(chunk)
                    pbar.update(len(chunk))


def download_if_not_exit(url, output_file):
    if os.path.exists(output_file):
        return
    try:
        Path(output_file).parent.mkdir(parents=True, exist_ok=True)
        download(url, output_file)
    except Exception as e:
        print(f"Failed to download {output_file} from {url}")
        raise e


def load_javascript(dir="javascript"):
    scripts_list = glob.glob(f"{dir}/*.js")
    javascript = ""
    for path in scripts_list:
        with open(path, "r", encoding="utf8") as jsfile:
            js_content = jsfile.read()
            js_content = js_content.replace("const MIDI_OUTPUT_BATCH_SIZE=4;",
                                            f"const MIDI_OUTPUT_BATCH_SIZE={OUTPUT_BATCH_SIZE};")
            javascript += f"\n<!-- {path} --><script>{js_content}</script>"
    template_response_ori = gr.routes.templates.TemplateResponse

    def template_response(*args, **kwargs):
        res = template_response_ori(*args, **kwargs)
        res.body = res.body.replace(
            b'</head>', f'{javascript}</head>'.encode("utf8"))
        res.init_headers()
        return res

    gr.routes.templates.TemplateResponse = template_response

def get_tokenizer(config_name):
    tv, size = config_name.split("-")
    tv = tv[1:]
    if tv[-1] == "o":
        o = True
        tv = tv[:-1]
    else:
        o = False
    if tv not in ["v1", "v2"]:
        raise ValueError(f"Unknown tokenizer version {tv}")
    tokenizer = MIDITokenizer(tv)
    tokenizer.set_optimise_midi(o)
    return tokenizer


def check_update(current_ver):
    v1 = version.parse(current_ver)
    url = f"https://api.github.com/repos/SkyTNT/midi-model/releases/latest"
    try:
        response = requests.get(url, timeout=2)
        if response.status_code == 200:
            latest_release = response.json()
            v2 = version.parse(latest_release['tag_name'])
            if v2 > v1:
                print(f"A new version (v{v2}) is available! You are currently using v{v1}."
                      f" Please update to the latest version for new features and improvements."
                      f" https://github.com/SkyTNT/midi-model/releases")
    except Exception:
        print("Failed to Check update")

number2drum_kits = {-1: "None", 0: "Standard", 8: "Room", 16: "Power", 24: "Electric", 25: "TR-808", 32: "Jazz",
                    40: "Blush", 48: "Orchestra"}
patch2number = {v: k for k, v in MIDI.Number2patch.items()}
drum_kits2number = {v: k for k, v in number2drum_kits.items()}
key_signatures = ['C♭', 'A♭m', 'G♭', 'E♭m', 'D♭', 'B♭m', 'A♭', 'Fm', 'E♭', 'Cm', 'B♭', 'Gm', 'F', 'Dm',
                  'C', 'Am', 'G', 'Em', 'D', 'Bm', 'A', 'F♯m', 'E', 'C♯m', 'B', 'G♯m', 'F♯', 'D♯m', 'C♯', 'A♯m']

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--share", action="store_true", default=False, help="share gradio app")
    parser.add_argument("--port", type=int, default=-1, help="gradio server port")
    parser.add_argument("--batch", type=int, default=8, help="batch size")
    parser.add_argument("--max-gen", type=int, default=4096, help="max")
    parser.add_argument("--soundfont-path", type=str, default="soundfont.sf2", help="soundfont")
    parser.add_argument("--model-config", type=str, default="tv2o-medium", help="model config name")
    parser.add_argument("--model-base-path", type=str,
                        default="models/default/model_base.onnx", help="model path")
    parser.add_argument("--model-token-path", type=str,
                        default="models/default/model_token.onnx", help="model path")
    parser.add_argument("--soundfont-url", type=str,
                        default="https://huggingface.co/skytnt/midi-model/resolve/main/soundfont.sf2",
                        help="download soundfont to soundfont-path if file not exist")
    parser.add_argument("--model-base-url", type=str,
                        default="https://huggingface.co/skytnt/midi-model-tv2o-medium/resolve/main/onnx/model_base.onnx",
                        help="download model-base to model-base-path if file not exist")
    parser.add_argument("--model-token-url", type=str,
                        default="https://huggingface.co/skytnt/midi-model-tv2o-medium/resolve/main/onnx/model_token.onnx",
                        help="download model-token to model-token-path if file not exist")
    opt = parser.parse_args()
    check_update(VERSION)
    OUTPUT_BATCH_SIZE = opt.batch
    models_info = {
        "generic pretrain model (tv2o-medium) by skytnt (default)": [
            opt.model_config,
            [opt.model_base_path, opt.model_base_url],
            [opt.model_token_path, opt.model_token_url]
        ],
        "generic pretrain model (tv2o-medium) by skytnt with jpop lora": [
            "tv2o-medium",
            ["models/tv2om_skytnt_jpop_lora/model_base.onnx",
             "https://huggingface.co/skytnt/midi-model-tv2om-jpop-lora/resolve/main/onnx/model_base.onnx"],
            ["models/tv2om_skytnt_jpop_lora/model_token.onnx",
             "https://huggingface.co/skytnt/midi-model-tv2om-jpop-lora/resolve/main/onnx/model_token.onnx"]
        ],
        "generic pretrain model (tv2o-medium) by skytnt with touhou lora": [
            "tv2o-medium",
            ["models/tv2om_skytnt_touhou_lora/model_base.onnx",
             "https://huggingface.co/skytnt/midi-model-tv2om-touhou-lora/resolve/main/onnx/model_base.onnx"],
            ["models/tv2om_skytnt_touhou_lora/model_token.onnx",
             "https://huggingface.co/skytnt/midi-model-tv2om-touhou-lora/resolve/main/onnx/model_token.onnx"]
        ],
        "generic pretrain model (tv2o-large) by asigalov61": [
            "tv2o-large",
            ["models/tv2ol_asigalov61/model_base.onnx",
             "https://huggingface.co/asigalov61/Music-Llama/resolve/main/onnx/model_base.onnx"],
            ["models/tv2ol_asigalov61/model_token.onnx",
             "https://huggingface.co/asigalov61/Music-Llama/resolve/main/onnx/model_token.onnx"]
        ],
        "generic pretrain model (tv2o-medium) by asigalov61": [
            "tv2o-medium",
            ["models/tv2om_asigalov61/model_base.onnx",
             "https://huggingface.co/asigalov61/Music-Llama-Medium/resolve/main/onnx/model_base.onnx"],
            ["models/tv2om_asigalov61/model_token.onnx",
             "https://huggingface.co/asigalov61/Music-Llama-Medium/resolve/main/onnx/model_token.onnx"]
        ],
        "generic pretrain model (tv1-medium) by skytnt": [
            "tv1-medium",
            ["models/tv1m_skytnt/model_base.onnx",
             "https://huggingface.co/skytnt/midi-model/resolve/main/onnx/model_base.onnx"],
            ["models/tv1m_skytnt/model_token.onnx",
             "https://huggingface.co/skytnt/midi-model/resolve/main/onnx/model_token.onnx"]
        ]
    }
    current_model = list(models_info.keys())[0]
    try:
        download_if_not_exit(opt.soundfont_url, opt.soundfont_path)
        download_if_not_exit(opt.model_base_url, opt.model_base_path)
        download_if_not_exit(opt.model_token_url, opt.model_token_path)
    except Exception as e:
        print(e)
        input("Failed to download files.\nPress any key to continue...")
        exit(-1)
    soundfont_path = opt.soundfont_path
    synthesizer = MidiSynthesizer(soundfont_path)
    thread_pool = ThreadPoolExecutor(max_workers=OUTPUT_BATCH_SIZE)
    tokenizer = get_tokenizer(opt.model_config)
    providers = ['CUDAExecutionProvider', 'CPUExecutionProvider']
    device = "cuda"
    try:
        model_base = rt.InferenceSession(opt.model_base_path, providers=providers)
        model_token = rt.InferenceSession(opt.model_token_path, providers=providers)
    except Exception as e:
        print(e)
        input("Failed to load models, maybe you need to delete them and re-download it.\nPress any key to continue...")
        exit(-1)

    load_javascript()
    app = gr.Blocks()
    with app:
        gr.Markdown("<h1 style='text-align: center; margin-bottom: 1rem'>Midi Composer</h1>")
        gr.Markdown("![Visitors](https://api.visitorbadge.io/api/visitors?path=skytnt.midi-composer&style=flat)\n\n"
                    "Midi event transformer for music generation\n\n"
                    "Demo for [SkyTNT/midi-model](https://github.com/SkyTNT/midi-model)\n\n"
                    "[Open In Colab]"
                    "(https://colab.research.google.com/github/SkyTNT/midi-model/blob/main/demo.ipynb)"
                    " for faster running and longer generation\n\n"
                    "**Update v1.3**: MIDITokenizerV2 and new MidiVisualizer\n\n"
                    "The current **best** model: generic pretrain model (tv2o-medium) by skytnt"
                    )
        js_msg = gr.Textbox(elem_id="msg_receiver", visible=False)
        js_msg.change(None, [js_msg], [], js="""
        (msg_json) =>{
            let msgs = JSON.parse(msg_json);
            executeCallbacks(msgReceiveCallbacks, msgs);
            return [];
        }
        """)
        input_model = gr.Dropdown(label="select model", choices=list(models_info.keys()),
                                  type="value", value=list(models_info.keys())[0])
        tab_select = gr.State(value=0)
        with gr.Tabs():
            with gr.TabItem("custom prompt") as tab1:
                input_instruments = gr.Dropdown(label="🪗instruments (auto if empty)", choices=list(patch2number.keys()),
                                                multiselect=True, max_choices=15, type="value")
                input_drum_kit = gr.Dropdown(label="🥁drum kit", choices=list(drum_kits2number.keys()), type="value",
                                             value="None")
                input_bpm = gr.Slider(label="BPM (beats per minute, auto if 0)", minimum=0, maximum=255,
                                              step=1,
                                              value=0)
                input_time_sig = gr.Radio(label="time signature (only for tv2 models)",
                                             value="auto",
                                             choices=["auto", "4/4", "2/4", "3/4", "6/4", "7/4",
                                                      "2/2", "3/2", "4/2", "3/8", "5/8", "6/8", "7/8", "9/8", "12/8"]
                                             )
                input_key_sig = gr.Radio(label="key signature (only for tv2 models)",
                                            value="auto",
                                            choices=["auto"] + key_signatures,
                                            type="index"
                                            )
                example1 = gr.Examples([
                    [[], "None"],
                    [["Acoustic Grand"], "None"],
                    [['Acoustic Grand', 'SynthStrings 2', 'SynthStrings 1', 'Pizzicato Strings',
                      'Pad 2 (warm)', 'Tremolo Strings', 'String Ensemble 1'], "Orchestra"],
                    [['Trumpet', 'Oboe', 'Trombone', 'String Ensemble 1', 'Clarinet',
                      'French Horn', 'Pad 4 (choir)', 'Bassoon', 'Flute'], "None"],
                    [['Flute', 'French Horn', 'Clarinet', 'String Ensemble 2', 'English Horn', 'Bassoon',
                      'Oboe', 'Pizzicato Strings'], "Orchestra"],
                    [['Electric Piano 2', 'Lead 5 (charang)', 'Electric Bass(pick)', 'Lead 2 (sawtooth)',
                      'Pad 1 (new age)', 'Orchestra Hit', 'Cello', 'Electric Guitar(clean)'], "Standard"],
                    [["Electric Guitar(clean)", "Electric Guitar(muted)", "Overdriven Guitar", "Distortion Guitar",
                      "Electric Bass(finger)"], "Standard"]
                ], [input_instruments, input_drum_kit])
            with gr.TabItem("midi prompt") as tab2:
                input_midi = gr.File(label="input midi", file_types=[".midi", ".mid"], type="binary")
                input_midi_events = gr.Slider(label="use first n midi events as prompt", minimum=1, maximum=512,
                                              step=1,
                                              value=128)
                input_reduce_cc_st = gr.Checkbox(label="reduce control_change and set_tempo events", value=True)
                input_remap_track_channel = gr.Checkbox(
                    label="remap tracks and channels so each track has only one channel and in order", value=True)
                input_add_default_instr = gr.Checkbox(
                    label="add a default instrument to channels that don't have an instrument", value=True)
                input_remove_empty_channels = gr.Checkbox(label="remove channels without notes", value=False)
            with gr.TabItem("last output prompt") as tab3:
                gr.Markdown("Continue generating on the last output.")
                input_continuation_select = gr.Radio(label="select output to continue generating", value="all",
                                                     choices=["all"] + [f"output{i + 1}" for i in
                                                                        range(OUTPUT_BATCH_SIZE)],
                                                     type="index"
                                                     )
                undo_btn = gr.Button("undo the last continuation")

        tab1.select(lambda: 0, None, tab_select, queue=False)
        tab2.select(lambda: 1, None, tab_select, queue=False)
        tab3.select(lambda: 2, None, tab_select, queue=False)
        input_seed = gr.Slider(label="seed", minimum=0, maximum=2 ** 31 - 1,
                               step=1, value=0)
        input_seed_rand = gr.Checkbox(label="random seed", value=True)
        input_gen_events = gr.Slider(label="generate max n midi events", minimum=1, maximum=opt.max_gen,
                                     step=1, value=opt.max_gen // 2)
        with gr.Accordion("options", open=False):
            input_temp = gr.Slider(label="temperature", minimum=0.1, maximum=1.2, step=0.01, value=1)
            input_top_p = gr.Slider(label="top p", minimum=0.1, maximum=1, step=0.01, value=0.94)
            input_top_k = gr.Slider(label="top k", minimum=1, maximum=128, step=1, value=20)
            input_allow_cc = gr.Checkbox(label="allow midi cc event", value=True)
            input_render_audio = gr.Checkbox(label="render audio after generation", value=True)
            example3 = gr.Examples([[1, 0.94, 128], [1, 0.98, 20], [1, 0.98, 12]],
                                   [input_temp, input_top_p, input_top_k])
        run_btn = gr.Button("generate", variant="primary")
        stop_btn = gr.Button("stop and output")
        output_midi_seq = gr.State()
        output_continuation_state = gr.State([0])
        midi_outputs = []
        audio_outputs = []
        with gr.Tabs(elem_id="output_tabs"):
            for i in range(OUTPUT_BATCH_SIZE):
                with gr.TabItem(f"output {i + 1}") as tab1:
                    output_midi_visualizer = gr.HTML(elem_id=f"midi_visualizer_container_{i}")
                    output_audio = gr.Audio(label="output audio", format="mp3", elem_id=f"midi_audio_{i}")
                    output_midi = gr.File(label="output midi", file_types=[".mid"])
                    midi_outputs.append(output_midi)
                    audio_outputs.append(output_audio)
        run_event = run_btn.click(run, [input_model, tab_select, output_midi_seq, output_continuation_state,
                                        input_continuation_select, input_instruments, input_drum_kit, input_bpm,
                                        input_time_sig, input_key_sig, input_midi, input_midi_events,
                                        input_reduce_cc_st, input_remap_track_channel, input_add_default_instr,
                                        input_remove_empty_channels, input_seed, input_seed_rand, input_gen_events,
                                        input_temp, input_top_p, input_top_k, input_allow_cc],
                                  [output_midi_seq, output_continuation_state, input_seed, js_msg],
                                  concurrency_limit=3, queue=True)
        finish_run_event = run_event.then(fn=finish_run,
                                          inputs=[output_midi_seq],
                                          outputs=midi_outputs + [js_msg],
                                          queue=False)
        finish_run_event.then(fn=render_audio,
                              inputs=[output_midi_seq, input_render_audio],
                              outputs=audio_outputs,
                              queue=False)
        stop_btn.click(None, [], [], cancels=run_event, queue=False)
        undo_btn.click(undo_continuation, [output_midi_seq, output_continuation_state],
                            [output_midi_seq, output_continuation_state, js_msg], queue=False)
    try:
        port = opt.port
        if port == -1:
            port = None
        app.launch(server_port=port, share=opt.share, inbrowser=True)
    except Exception as e:
        print(e)
        input("Failed to launch webui.\nPress any key to continue...")
        exit(-1)
    finally:
        thread_pool.shutdown()