import time from pathlib import Path import numpy as np import torch import torch.nn.functional as F from torch import optim from torch.utils.data import DataLoader import vocoder.hparams as hp from vocoder.display import stream, simple_table from vocoder.distribution import discretized_mix_logistic_loss from vocoder.gen_wavernn import gen_testset from vocoder.models.fatchord_version import WaveRNN from vocoder.vocoder_dataset import VocoderDataset, collate_vocoder def train(run_id: str, syn_dir: Path, voc_dir: Path, models_dir: Path, ground_truth: bool, save_every: int, backup_every: int, force_restart: bool): # Check to make sure the hop length is correctly factorised assert np.cumprod(hp.voc_upsample_factors)[-1] == hp.hop_length # Instantiate the model print("Initializing the model...") model = WaveRNN( rnn_dims=hp.voc_rnn_dims, fc_dims=hp.voc_fc_dims, bits=hp.bits, pad=hp.voc_pad, upsample_factors=hp.voc_upsample_factors, feat_dims=hp.num_mels, compute_dims=hp.voc_compute_dims, res_out_dims=hp.voc_res_out_dims, res_blocks=hp.voc_res_blocks, hop_length=hp.hop_length, sample_rate=hp.sample_rate, mode=hp.voc_mode ) if torch.cuda.is_available(): model = model.cuda() # Initialize the optimizer optimizer = optim.Adam(model.parameters()) for p in optimizer.param_groups: p["lr"] = hp.voc_lr loss_func = F.cross_entropy if model.mode == "RAW" else discretized_mix_logistic_loss # Load the weights model_dir = models_dir / run_id model_dir.mkdir(exist_ok=True) weights_fpath = model_dir / "vocoder.pt" if force_restart or not weights_fpath.exists(): print("\nStarting the training of WaveRNN from scratch\n") model.save(weights_fpath, optimizer) else: print("\nLoading weights at %s" % weights_fpath) model.load(weights_fpath, optimizer) print("WaveRNN weights loaded from step %d" % model.step) # Initialize the dataset metadata_fpath = syn_dir.joinpath("train.txt") if ground_truth else \ voc_dir.joinpath("synthesized.txt") mel_dir = syn_dir.joinpath("mels") if ground_truth else voc_dir.joinpath("mels_gta") wav_dir = syn_dir.joinpath("audio") dataset = VocoderDataset(metadata_fpath, mel_dir, wav_dir) test_loader = DataLoader(dataset, batch_size=1, shuffle=True) # Begin the training simple_table([('Batch size', hp.voc_batch_size), ('LR', hp.voc_lr), ('Sequence Len', hp.voc_seq_len)]) for epoch in range(1, 350): data_loader = DataLoader(dataset, hp.voc_batch_size, shuffle=True, num_workers=2, collate_fn=collate_vocoder) start = time.time() running_loss = 0. for i, (x, y, m) in enumerate(data_loader, 1): if torch.cuda.is_available(): x, m, y = x.cuda(), m.cuda(), y.cuda() # Forward pass y_hat = model(x, m) if model.mode == 'RAW': y_hat = y_hat.transpose(1, 2).unsqueeze(-1) elif model.mode == 'MOL': y = y.float() y = y.unsqueeze(-1) # Backward pass loss = loss_func(y_hat, y) optimizer.zero_grad() loss.backward() optimizer.step() running_loss += loss.item() speed = i / (time.time() - start) avg_loss = running_loss / i step = model.get_step() k = step // 1000 if backup_every != 0 and step % backup_every == 0 : model.checkpoint(model_dir, optimizer) if save_every != 0 and step % save_every == 0 : model.save(weights_fpath, optimizer) msg = f"| Epoch: {epoch} ({i}/{len(data_loader)}) | " \ f"Loss: {avg_loss:.4f} | {speed:.1f} " \ f"steps/s | Step: {k}k | " stream(msg) gen_testset(model, test_loader, hp.voc_gen_at_checkpoint, hp.voc_gen_batched, hp.voc_target, hp.voc_overlap, model_dir) print("")