inference.py

import os
import json
import random
import argparse
import soundfile as sf
import numpy as np

import torch
from diffusers import DDPMScheduler
from pico_model import PicoDiffusion, build_pretrained_models

class dotdict(dict):
    """dot.notation access to dictionary attributes"""
    __getattr__ = dict.get
    __setattr__ = dict.__setitem__
    __delattr__ = dict.__delitem__

def parse_args():
    parser = argparse.ArgumentParser(description="Inference for text to audio generation task.")
    parser.add_argument(
        "--text", '-t', type=str, default="spraying at 0.38-1.176_3.06-3.856 and gunshot at 1.729-3.729_4.367-6.367_7.031-9.031.",
        help="Path for experiment."
    )
    parser.add_argument(
        "--exp_path", '-exp', type=str, default="/hpc_stor03/sjtu_home/zeyu.xie/workspace/controllable_audio_generation/huggingface/ckpts/pico_model",
        help="Path for experiment."
    )
    parser.add_argument(
        "--freeze_text_encoder_ckpt", type=str, default='/hpc_stor03/sjtu_home/zeyu.xie/workspace/controllable_audio_generation/huggingface/ckpts/laion_clap/630k-audioset-best.pt',
        help="Path for clap."
    )
    parser.add_argument(
        "--seed", type=int, default=0,
        help="seed.",
    )
    
    args = parser.parse_args()
    args.original_args = os.path.join(args.exp_path, "summary.jsonl")    
    args.diffusion_pt = os.path.join(args.exp_path, "diffusion.pt")
    return args

def main():
    args = parse_args() 
    train_args = dotdict(json.loads(open(args.original_args).readlines()[0]))
  
    seed = args.seed
    random.seed(seed)
    np.random.seed(seed)
    torch.manual_seed(seed)    
    if torch.cuda.is_available():
        torch.backends.cudnn.deterministic = True
        torch.backends.cudnn.benchmark = False

    # Load Models #  
    print("------Load model")
    name = "audioldm-s-full"
    vae, stft = build_pretrained_models(name)
    vae, stft = vae.cuda(), stft.cuda()
    model = PicoDiffusion(
        scheduler_name=train_args.scheduler_name, 
        unet_model_config_path=train_args.unet_model_config, 
        snr_gamma=train_args.snr_gamma,
        freeze_text_encoder_ckpt=args.freeze_text_encoder_ckpt,
        diffusion_pt=args.diffusion_pt,
    ).cuda().eval()
    scheduler = DDPMScheduler.from_pretrained(train_args.scheduler_name, subfolder="scheduler")
    
    # Generate #
    num_steps, guidance, num_samples, audio_len = 200, 3.0, 1, 16000 * 10
    output_dir = os.path.join("/hpc_stor03/sjtu_home/zeyu.xie/workspace/controllable_audio_generation/synthesized", 
        f"huggingface_demo_steps-{num_steps}_guidance-{guidance}_samples-{num_samples}")
    os.makedirs(output_dir, exist_ok=True)
    
    print("------Diffusion begin!")    
    with torch.no_grad():
        latents = model.demo_inference(args.text, scheduler, num_steps, guidance, num_samples, disable_progress=True)
        mel = vae.decode_first_stage(latents)
        wave = vae.decode_to_waveform(mel)
        sf.write(f"{output_dir}/{args.text}.wav", wave[0][:audio_len], samplerate=16000, subtype='PCM_16')
    print(f"------Write to files to {output_dir}/{args.text}.wav")

if __name__ == "__main__":
    main()