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Sana/finetune.py

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+# load packages
+
+# Use this script if the DDP scripts didn't work out for you.
+# DDP スクリプトが機能しなかった場合は、このスクリプトを使用します。
+
+import random
+import yaml
+import time
+from munch import Munch
+import numpy as np
+import torch
+from torch import nn
+import torch.nn.functional as F
+import torchaudio
+import librosa
+import click
+import shutil
+import warnings
+warnings.simplefilter('ignore')
+from torch.utils.tensorboard import SummaryWriter
+
+from meldataset import build_dataloader
+
+from Utils.ASR.models import ASRCNN
+from Utils.JDC.model import JDCNet
+from Utils.PLBERT.util import load_plbert
+
+from models import *
+from losses import *
+from utils import *
+
+from Modules.slmadv import SLMAdversarialLoss
+from Modules.diffusion.sampler import DiffusionSampler, ADPM2Sampler, KarrasSchedule
+
+from optimizers import build_optimizer
+
+from accelerate import Accelerator, DistributedDataParallelKwargs
+from accelerate.utils import tqdm, ProjectConfiguration
+
+try:
+    import wandb
+except ImportError:
+    wandb = None
+
+# from Utils.fsdp_patch import replace_fsdp_state_dict_type
+
+# replace_fsdp_state_dict_type()
+from accelerate import Accelerator
+from accelerate.utils import LoggerType
+from accelerate import DistributedDataParallelKwargs
+
+from torch.utils.tensorboard import SummaryWriter
+
+import logging
+from accelerate.logging import get_logger
+logger = get_logger(__name__, log_level="DEBUG")
+
+
+# handler.setLevel(logging.DEBUG)
+# logger.addHandler(handler)
+# simple fix for dataparallel that allows access to class attributes
+class MyDataParallel(torch.nn.DataParallel):
+    def __getattr__(self, name):
+        try:
+            return super().__getattr__(name)
+        except AttributeError:
+            return getattr(self.module, name)
+
+
+@click.command()
+@click.option('-p', '--config_path', default='Configs/config_ft.yml', type=str)
+def main(config_path):
+    config = yaml.safe_load(open(config_path))
+    
+    save_iter = 1000
+
+    log_dir = config['log_dir']
+    if not osp.exists(log_dir): os.makedirs(log_dir, exist_ok=True)
+    shutil.copy(config_path, osp.join(log_dir, osp.basename(config_path)))
+    ddp_kwargs = DistributedDataParallelKwargs(find_unused_parameters=True)
+    accelerator = Accelerator(project_dir=log_dir, split_batches=True, kwargs_handlers=[ddp_kwargs], mixed_precision='bf16')    
+    if accelerator.is_main_process:
+        writer = SummaryWriter(log_dir + "/tensorboard")
+
+    # write logs
+    file_handler = logging.FileHandler(osp.join(log_dir, 'train.log'))
+    file_handler.setLevel(logging.DEBUG)
+    file_handler.setFormatter(logging.Formatter('%(levelname)s:%(asctime)s: %(message)s'))
+    logger.logger.addHandler(file_handler)
+    
+
+    
+    batch_size = config.get('batch_size', 10)
+
+    epochs = config.get('epochs', 200)
+    save_freq = config.get('save_freq', 2)
+    log_interval = config.get('log_interval', 10)
+    saving_epoch = config.get('save_freq', 2)
+
+    data_params = config.get('data_params', None)
+    sr = config['preprocess_params'].get('sr', 24000)
+    train_path = data_params['train_data']
+    val_path = data_params['val_data']
+    root_path = data_params['root_path']
+    min_length = data_params['min_length']
+    OOD_data = data_params['OOD_data']
+
+    max_len = config.get('max_len', 200)
+    
+    loss_params = Munch(config['loss_params'])
+    diff_epoch = loss_params.diff_epoch
+    joint_epoch = loss_params.joint_epoch
+    
+    optimizer_params = Munch(config['optimizer_params'])
+    
+    train_list, val_list = get_data_path_list(train_path, val_path)
+    device = 'cuda'
+
+    train_dataloader = build_dataloader(train_list,
+                                        root_path,
+                                        OOD_data=OOD_data,
+                                        min_length=min_length,
+                                        batch_size=batch_size,
+                                        num_workers=16,
+                                        dataset_config={},
+                                        device=device)
+
+    val_dataloader = build_dataloader(val_list,
+                                      root_path,
+                                      OOD_data=OOD_data,
+                                      min_length=min_length,
+                                      batch_size=batch_size,
+                                      validation=True,
+                                      num_workers=4,
+                                      device=device,
+                                      dataset_config={})
+    
+
+    with accelerator.main_process_first():
+        # load pretrained ASR model
+        ASR_config = config.get('ASR_config', False)
+        ASR_path = config.get('ASR_path', False)
+        text_aligner = load_ASR_models(ASR_path, ASR_config)
+
+        # load pretrained F0 model
+        F0_path = config.get('F0_path', False)
+        pitch_extractor = load_F0_models(F0_path)
+
+        # load BERT model
+        from Utils.PLBERT.util import load_plbert
+        BERT_path = config.get('PLBERT_dir', False)
+        plbert = load_plbert(BERT_path)
+
+    scheduler_params = {
+        "max_lr": float(config['optimizer_params'].get('lr', 1e-4)),
+        "pct_start": float(config['optimizer_params'].get('pct_start', 0.0)),
+        "epochs": epochs,
+        "steps_per_epoch": len(train_dataloader),
+    }
+
+
+    # build model
+    model_params = recursive_munch(config['model_params'])
+    multispeaker = model_params.multispeaker
+    model = build_model(model_params, text_aligner, pitch_extractor, plbert)
+    _ = [model[key].to(device) for key in model]
+    
+    
+    
+    scheduler_params_dict= {key: scheduler_params.copy() for key in model}
+    scheduler_params_dict['bert']['max_lr'] = optimizer_params.bert_lr * 2
+    scheduler_params_dict['decoder']['max_lr'] = optimizer_params.ft_lr * 2
+    scheduler_params_dict['style_encoder']['max_lr'] = optimizer_params.ft_lr * 2
+    
+    
+    optimizer = build_optimizer({key: model[key].parameters() for key in model},
+                                  scheduler_params_dict= {key: scheduler_params.copy() for key in model},
+                               lr=float(config['optimizer_params'].get('lr', 1e-4)))
+    
+    for k, v in optimizer.optimizers.items():
+        optimizer.optimizers[k] = accelerator.prepare(optimizer.optimizers[k])
+        optimizer.schedulers[k] = accelerator.prepare(optimizer.schedulers[k])
+
+    
+    for k in model:
+        model[k] = accelerator.prepare(model[k])
+    
+    train_dataloader, val_dataloader = accelerator.prepare(
+        train_dataloader, val_dataloader
+    )
+      
+    start_epoch = 0
+    iters = 0
+
+
+    
+    with accelerator.main_process_first():
+        if config.get('pretrained_model', '') and config.get('second_stage_load_pretrained', False):
+            model, optimizer, start_epoch, iters = load_checkpoint(
+                model,
+                optimizer,
+                config['pretrained_model'],
+                load_only_params=config.get('load_only_params', True)
+            )
+            accelerator.print('Loading the checkpoint at %s ...' % config['pretrained_model'])
+        elif config.get('first_stage_path', ''):
+            first_stage_path = osp.join(log_dir, config.get('first_stage_path', 'first_stage.pth'))
+            accelerator.print('Loading the first stage model at %s ...' % first_stage_path)
+            model, optimizer, start_epoch, iters = load_checkpoint(
+                model,
+                optimizer,
+                first_stage_path,
+                load_only_params=True,
+                ignore_modules=['bert', 'bert_encoder', 'predictor', 'predictor_encoder', 'msd', 'mpd', 'wd', 'diffusion']) # keep starting epoch for tensorboard log
+            
+        else:
+            raise ValueError('You need to specify a pretrained model or a first stage model path.')
+
+
+    gl = GeneratorLoss(model.mpd, model.msd).to(device)
+    dl = DiscriminatorLoss(model.mpd, model.msd).to(device)
+    wl = WavLMLoss(model_params.slm.model, 
+                   model.wd, 
+                   sr, 
+                   model_params.slm.sr).to(device)
+    
+    wl = wl.eval()
+
+
+    sampler = DiffusionSampler(
+        model.diffusion.module.diffusion,
+        sampler=ADPM2Sampler(),
+        sigma_schedule=KarrasSchedule(sigma_min=0.0001, sigma_max=3.0, rho=9.0), # empirical parameters
+        clamp=False
+    )
+    
+
+    
+
+    # adjust BERT learning rate
+    for g in optimizer.optimizers['bert'].param_groups:
+        g['betas'] = (0.9, 0.99)
+        g['lr'] = optimizer_params.bert_lr
+        g['initial_lr'] = optimizer_params.bert_lr
+        g['min_lr'] = 0
+        g['weight_decay'] = 0.01
+        
+    # adjust acoustic module learning rate
+    for module in ["decoder", "style_encoder"]:
+        for g in optimizer.optimizers[module].param_groups:
+            g['betas'] = (0.0, 0.99)
+            g['lr'] = optimizer_params.ft_lr
+            g['initial_lr'] = optimizer_params.ft_lr
+            g['min_lr'] = 0
+            g['weight_decay'] = 1e-4
+        
+    # # load models if there is a model
+    # if load_pretrained:
+    #     model, optimizer, start_epoch, iters = load_checkpoint(model,  optimizer, config['pretrained_model'],
+    #                                 load_only_params=config.get('load_only_params', True))
+    
+    
+    try:
+        n_down = model.text_aligner.module.n_down
+    except:
+        n_down = model.text_aligner.n_down
+
+    best_loss = float('inf')  # best test loss
+    loss_train_record = list([])
+    loss_test_record = list([])
+    iters = 0
+    
+    criterion = nn.L1Loss() # F0 loss (regression)
+    torch.cuda.empty_cache()
+    
+    stft_loss = MultiResolutionSTFTLoss().to(device)
+    
+    print('BERT', optimizer.optimizers['bert'])
+    print('decoder', optimizer.optimizers['decoder'])
+
+    start_ds = False
+    
+    running_std = []
+    
+    slmadv_params = Munch(config['slmadv_params'])
+    slmadv = SLMAdversarialLoss(model, wl, sampler, 
+                                slmadv_params.min_len, 
+                                slmadv_params.max_len,
+                                batch_percentage=slmadv_params.batch_percentage,
+                                skip_update=slmadv_params.iter, 
+                                sig=slmadv_params.sig
+                               )
+    
+    
+    for epoch in range(start_epoch, epochs):
+        running_loss = 0
+        start_time = time.time()
+
+        _ = [model[key].eval() for key in model]
+        
+        model.text_aligner.train()
+        model.text_encoder.train()
+        
+        model.predictor.train()
+        model.bert_encoder.train()
+        model.bert.train()
+        model.msd.train()
+        model.mpd.train()
+
+        for i, batch in enumerate(train_dataloader):
+            waves = batch[0]
+            batch = [b.to(device) for b in batch[1:]]
+            texts, input_lengths, ref_texts, ref_lengths, mels, mel_input_length, ref_mels = batch
+            with torch.no_grad():
+                mask = length_to_mask(mel_input_length // (2 ** n_down)).to(device)
+                mel_mask = length_to_mask(mel_input_length).to(device)
+                text_mask = length_to_mask(input_lengths).to(texts.device)
+
+                # compute reference styles
+                if multispeaker and epoch >= diff_epoch:
+                    ref_ss = model.style_encoder(ref_mels)
+                    ref_sp = model.predictor_encoder(ref_mels)
+                    ref = torch.cat([ref_ss, ref_sp], dim=1)
+                
+            try:
+                ppgs, s2s_pred, s2s_attn = model.text_aligner(mels, mask, texts)
+                s2s_attn = s2s_attn.transpose(-1, -2)
+                s2s_attn = s2s_attn[..., 1:]
+                s2s_attn = s2s_attn.transpose(-1, -2)
+            except:
+                continue
+
+            mask_ST = mask_from_lens(s2s_attn, input_lengths, mel_input_length // (2 ** n_down))
+            s2s_attn_mono = maximum_path(s2s_attn, mask_ST)
+
+            # encode
+            t_en = model.text_encoder(texts, input_lengths, text_mask)
+            
+            # 50% of chance of using monotonic version
+            if bool(random.getrandbits(1)):
+                asr = (t_en @ s2s_attn)
+            else:
+                asr = (t_en @ s2s_attn_mono)
+
+            d_gt = s2s_attn_mono.sum(axis=-1).detach()
+
+            # compute the style of the entire utterance
+            # this operation cannot be done in batch because of the avgpool layer (may need to work on masked avgpool)
+            ss = []
+            gs = []
+            for bib in range(len(mel_input_length)):
+                mel_length = int(mel_input_length[bib].item())
+                mel = mels[bib, :, :mel_input_length[bib]]
+                s = model.predictor_encoder(mel.unsqueeze(0))
+                ss.append(s)
+                s = model.style_encoder(mel.unsqueeze(0))
+                gs.append(s)
+
+            s_dur = torch.stack(ss).squeeze()  # global prosodic styles
+            gs = torch.stack(gs).squeeze() # global acoustic styles
+            s_trg = torch.cat([gs, s_dur], dim=-1).detach() # ground truth for denoiser
+
+            bert_dur = model.bert(texts, attention_mask=(~text_mask).int())
+            d_en = model.bert_encoder(bert_dur).transpose(-1, -2) 
+            
+            # denoiser training
+            if epoch >= diff_epoch:
+                num_steps = np.random.randint(3, 5)
+                
+                if model_params.diffusion.dist.estimate_sigma_data:
+                    model.diffusion.module.diffusion.sigma_data = s_trg.std(axis=-1).mean().item() # batch-wise std estimation
+                    running_std.append(model.diffusion.module.diffusion.sigma_data)
+                    
+                if multispeaker:
+                    s_preds = sampler(noise = torch.randn_like(s_trg).unsqueeze(1).to(device), 
+                          embedding=bert_dur,
+                          embedding_scale=1,
+                                   features=ref, # reference from the same speaker as the embedding
+                             embedding_mask_proba=0.1,
+                             num_steps=num_steps).squeeze(1)
+                    loss_diff = model.diffusion.module.diffusion(s_trg.unsqueeze(1), embedding=bert_dur, features=ref).mean() # EDM loss
+                    loss_sty = F.l1_loss(s_preds, s_trg.detach()) # style reconstruction loss
+                else:
+                    s_preds = sampler(noise = torch.randn_like(s_trg).unsqueeze(1).to(device), 
+                          embedding=bert_dur,
+                          embedding_scale=1,
+                             embedding_mask_proba=0.1,
+                             num_steps=num_steps).squeeze(1)                    
+                    loss_diff = model.diffusion.module.diffusion(s_trg.unsqueeze(1), embedding=bert_dur).mean() # EDM loss
+                    loss_sty = F.l1_loss(s_preds, s_trg.detach()) # style reconstruction loss
+            else:
+                loss_sty = 0
+                loss_diff = 0
+
+                
+            s_loss = 0
+            
+
+            d, p = model.predictor(d_en, s_dur, 
+                                                    input_lengths, 
+                                                    s2s_attn_mono, 
+                                                    text_mask)
+                
+            mel_len_st = int(mel_input_length.min().item() / 2 - 1)
+            mel_len = min(int(mel_input_length.min().item() / 2 - 1), max_len // 2)
+            en = []
+            gt = []
+            p_en = []
+            wav = []
+            st = []
+            
+            for bib in range(len(mel_input_length)):
+                mel_length = int(mel_input_length[bib].item() / 2)
+
+                random_start = np.random.randint(0, mel_length - mel_len)
+                en.append(asr[bib, :, random_start:random_start+mel_len])
+                p_en.append(p[bib, :, random_start:random_start+mel_len])
+                gt.append(mels[bib, :, (random_start * 2):((random_start+mel_len) * 2)])
+                
+                y = waves[bib][(random_start * 2) * 300:((random_start+mel_len) * 2) * 300]
+                wav.append(torch.from_numpy(y).to(device))
+                
+                # style reference (better to be different from the GT)
+                random_start = np.random.randint(0, mel_length - mel_len_st)
+                st.append(mels[bib, :, (random_start * 2):((random_start+mel_len_st) * 2)])
+                
+            wav = torch.stack(wav).float().detach()
+
+            en = torch.stack(en)
+            p_en = torch.stack(p_en)
+            gt = torch.stack(gt).detach()
+            st = torch.stack(st).detach()
+            
+            
+            # if gt.size(-1) < 80:
+            #     continue
+            
+            s = model.style_encoder(gt)           
+            s_dur = model.predictor_encoder(gt)
+                
+            with torch.no_grad():
+                F0_real, _, F0 = model.pitch_extractor(gt.unsqueeze(1))
+                F0 = F0.reshape(F0.shape[0], F0.shape[1] * 2, F0.shape[2], 1).squeeze()
+
+                N_real = log_norm(gt.unsqueeze(1)).squeeze(1)
+                
+                y_rec_gt = wav.unsqueeze(1)
+                y_rec_gt_pred = model.decoder(en, F0_real, N_real, s)
+
+                wav = y_rec_gt
+
+            # F0_fake, N_fake = model.predictor.F0Ntrain(p_en, s_dur)
+            
+            F0_fake, N_fake = model.predictor(texts=p_en, style=s_dur, f0=True)
+
+            y_rec = model.decoder(en, F0_fake, N_fake, s)
+
+            loss_F0_rec =  (F.smooth_l1_loss(F0_real, F0_fake)) / 10
+            loss_norm_rec = F.smooth_l1_loss(N_real, N_fake)
+
+            optimizer.zero_grad()
+            d_loss = dl(wav.detach(), y_rec.detach()).mean()
+            d_loss.backward()
+            optimizer.step('msd')
+            optimizer.step('mpd')
+
+            # generator loss
+            optimizer.zero_grad()
+
+            loss_mel = stft_loss(y_rec, wav)
+            loss_gen_all = gl(wav, y_rec).mean()
+            loss_lm = wl(wav.detach().squeeze(), y_rec.squeeze()).mean()
+
+            loss_ce = 0
+            loss_dur = 0
+            for _s2s_pred, _text_input, _text_length in zip(d, (d_gt), input_lengths):
+                _s2s_pred = _s2s_pred[:_text_length, :]
+                _text_input = _text_input[:_text_length].long()
+                _s2s_trg = torch.zeros_like(_s2s_pred)
+                for p in range(_s2s_trg.shape[0]):
+                    _s2s_trg[p, :_text_input[p]] = 1
+                _dur_pred = torch.sigmoid(_s2s_pred).sum(axis=1)
+
+                loss_dur += F.l1_loss(_dur_pred[1:_text_length-1], 
+                                       _text_input[1:_text_length-1])
+                loss_ce += F.binary_cross_entropy_with_logits(_s2s_pred.flatten(), _s2s_trg.flatten())
+
+            loss_ce /= texts.size(0)
+            loss_dur /= texts.size(0)
+            
+            loss_s2s = 0
+            for _s2s_pred, _text_input, _text_length in zip(s2s_pred, texts, input_lengths):
+                loss_s2s += F.cross_entropy(_s2s_pred[:_text_length], _text_input[:_text_length])
+            loss_s2s /= texts.size(0)
+
+            loss_mono = F.l1_loss(s2s_attn, s2s_attn_mono) * 10
+
+            g_loss = loss_params.lambda_mel * loss_mel + \
+                     loss_params.lambda_F0 * loss_F0_rec + \
+                     loss_params.lambda_ce * loss_ce + \
+                     loss_params.lambda_norm * loss_norm_rec + \
+                     loss_params.lambda_dur * loss_dur + \
+                     loss_params.lambda_gen * loss_gen_all + \
+                     loss_params.lambda_slm * loss_lm + \
+                     loss_params.lambda_sty * loss_sty + \
+                     loss_params.lambda_diff * loss_diff + \
+                    loss_params.lambda_mono * loss_mono + \
+                    loss_params.lambda_s2s * loss_s2s
+            
+            running_loss += loss_mel.item()
+            g_loss.backward()
+            if torch.isnan(g_loss):
+                from IPython.core.debugger import set_trace
+                set_trace()
+
+            optimizer.step('bert_encoder')
+            optimizer.step('bert')
+            optimizer.step('predictor')
+            optimizer.step('predictor_encoder')
+            optimizer.step('style_encoder')
+            optimizer.step('decoder')
+            
+            optimizer.step('text_encoder')
+            optimizer.step('text_aligner')
+            
+            if epoch >= diff_epoch:
+                optimizer.step('diffusion')
+
+            d_loss_slm, loss_gen_lm = 0, 0
+            if epoch >= joint_epoch:
+                # randomly pick whether to use in-distribution text
+                if np.random.rand() < 0.5:
+                    use_ind = True
+                else:
+                    use_ind = False
+
+                if use_ind:
+                    ref_lengths = input_lengths
+                    ref_texts = texts
+                    
+                slm_out = slmadv(i, 
+                                 y_rec_gt, 
+                                 y_rec_gt_pred, 
+                                 waves, 
+                                 mel_input_length,
+                                 ref_texts, 
+                                 ref_lengths, use_ind, s_trg.detach(), ref if multispeaker else None)
+
+                if slm_out is not None:
+                    d_loss_slm, loss_gen_lm, y_pred = slm_out
+
+                    # SLM generator loss
+                    optimizer.zero_grad()
+                    loss_gen_lm.backward()
+
+                    # compute the gradient norm
+                    total_norm = {}
+                    for key in model.keys():
+                        total_norm[key] = 0
+                        parameters = [p for p in model[key].parameters() if p.grad is not None and p.requires_grad]
+                        for p in parameters:
+                            param_norm = p.grad.detach().data.norm(2)
+                            total_norm[key] += param_norm.item() ** 2
+                        total_norm[key] = total_norm[key] ** 0.5
+
+                    # gradient scaling
+                    if total_norm['predictor'] > slmadv_params.thresh:
+                        for key in model.keys():
+                            for p in model[key].parameters():
+                                if p.grad is not None:
+                                    p.grad *= (1 / total_norm['predictor'])
+
+                    for p in model.predictor.duration_proj.parameters():
+                        if p.grad is not None:
+                            p.grad *= slmadv_params.scale
+
+                    for p in model.predictor.lstm.parameters():
+                        if p.grad is not None:
+                            p.grad *= slmadv_params.scale
+
+                    for p in model.diffusion.parameters():
+                        if p.grad is not None:
+                            p.grad *= slmadv_params.scale
+                    
+                    optimizer.step('bert_encoder')
+                    optimizer.step('bert')
+                    optimizer.step('predictor')
+                    optimizer.step('diffusion')
+
+                    # SLM discriminator loss
+                    if d_loss_slm != 0:
+                        optimizer.zero_grad()
+                        d_loss_slm.backward(retain_graph=True)
+                        optimizer.step('wd')
+
+            iters = iters + 1
+            
+            if (i+1)%log_interval == 0 and accelerator.is_main_process:
+                log_print('Epoch [%d/%d], Step [%d/%d], Loss: %.5f, Disc Loss: %.5f, Dur Loss: %.5f, CE Loss: %.5f, Norm Loss: %.5f, F0 Loss: %.5f, LM Loss: %.5f, Gen Loss: %.5f, Sty Loss: %.5f, Diff Loss: %.5f, DiscLM Loss: %.5f, GenLM Loss: %.5f, SLoss: %.5f, S2S Loss: %.5f, Mono Loss: %.5f'
+                    %(epoch+1, epochs, i+1, len(train_list)//batch_size, running_loss / log_interval, d_loss, loss_dur, loss_ce, loss_norm_rec, loss_F0_rec, loss_lm, loss_gen_all, loss_sty, loss_diff, d_loss_slm, loss_gen_lm, s_loss, loss_s2s, loss_mono), logger)
+                
+                writer.add_scalar('train/mel_loss', running_loss / log_interval, iters)
+                writer.add_scalar('train/gen_loss', loss_gen_all, iters)
+                writer.add_scalar('train/d_loss', d_loss, iters)
+                writer.add_scalar('train/ce_loss', loss_ce, iters)
+                writer.add_scalar('train/dur_loss', loss_dur, iters)
+                writer.add_scalar('train/slm_loss', loss_lm, iters)
+                writer.add_scalar('train/norm_loss', loss_norm_rec, iters)
+                writer.add_scalar('train/F0_loss', loss_F0_rec, iters)
+                writer.add_scalar('train/sty_loss', loss_sty, iters)
+                writer.add_scalar('train/diff_loss', loss_diff, iters)
+                writer.add_scalar('train/d_loss_slm', d_loss_slm, iters)
+                writer.add_scalar('train/gen_loss_slm', loss_gen_lm, iters)
+                
+                running_loss = 0
+                
+                print('Time elasped:', time.time()-start_time)
+                
+            if (i+1)%save_iter == 0 and accelerator.is_main_process:
+
+                accelerator.print(f'Saving on step {epoch*len(train_dataloader)+i}...')
+                state = {
+                    'net':  {key: model[key].state_dict() for key in model}, 
+                    'optimizer': optimizer.state_dict(),
+                    'iters': iters,
+                    'epoch': epoch,
+                }
+                save_path = osp.join(log_dir, f'Sana_Finetune__{epoch*len(train_dataloader)+i}.pth')
+                torch.save(state, save_path)                  
+                                
+            
+        loss_test = 0
+        loss_align = 0
+        loss_f = 0
+        _ = [model[key].eval() for key in model]
+
+        with torch.no_grad():
+            iters_test = 0
+            for batch_idx, batch in enumerate(val_dataloader):
+                optimizer.zero_grad()
+
+                try:
+                    waves = batch[0]
+                    batch = [b.to(device) for b in batch[1:]]
+                    texts, input_lengths, ref_texts, ref_lengths, mels, mel_input_length, ref_mels = batch
+                    with torch.no_grad():
+                        mask = length_to_mask(mel_input_length // (2 ** n_down)).to('cuda')
+                        text_mask = length_to_mask(input_lengths).to(texts.device)
+
+                        _, _, s2s_attn = model.text_aligner(mels, mask, texts)
+                        s2s_attn = s2s_attn.transpose(-1, -2)
+                        s2s_attn = s2s_attn[..., 1:]
+                        s2s_attn = s2s_attn.transpose(-1, -2)
+
+                        mask_ST = mask_from_lens(s2s_attn, input_lengths, mel_input_length // (2 ** n_down))
+                        s2s_attn_mono = maximum_path(s2s_attn, mask_ST)
+
+                        # encode
+                        t_en = model.text_encoder(texts, input_lengths, text_mask)
+                        asr = (t_en @ s2s_attn_mono)
+
+                        d_gt = s2s_attn_mono.sum(axis=-1).detach()
+
+                    ss = []
+                    gs = []
+
+                    for bib in range(len(mel_input_length)):
+                        mel_length = int(mel_input_length[bib].item())
+                        mel = mels[bib, :, :mel_input_length[bib]]
+                        s = model.predictor_encoder(mel.unsqueeze(0))
+                        ss.append(s)
+                        s = model.style_encoder(mel.unsqueeze(0))
+                        gs.append(s)
+
+                    s = torch.stack(ss).squeeze()
+                    gs = torch.stack(gs).squeeze()
+                    s_trg = torch.cat([s, gs], dim=-1).detach()
+
+                    bert_dur = model.bert(texts, attention_mask=(~text_mask).int())
+                    d_en = model.bert_encoder(bert_dur).transpose(-1, -2) 
+                    d, p = model.predictor(d_en, s, 
+                                                        input_lengths, 
+                                                        s2s_attn_mono, 
+                                                        text_mask)
+                    # get clips
+                    # mel_len = int(mel_input_length.min().item() / 2 - 1)
+                    
+                    mel_input_length_all = accelerator.gather(mel_input_length) # for balanced load
+                    mel_len = min([int(mel_input_length_all.min().item() / 2 - 1), max_len // 2])
+                    
+                    mel_len_st = int(mel_input_length.min().item() / 2 - 1)
+                    en = []
+                    gt = []
+
+                    p_en = []
+                    wav = []
+                    
+                    for bib in range(len(mel_input_length)):
+                        mel_length = int(mel_input_length[bib].item() / 2)
+
+                        random_start = np.random.randint(0, mel_length - mel_len)
+                        en.append(asr[bib, :, random_start:random_start+mel_len])
+                        p_en.append(p[bib, :, random_start:random_start+mel_len])
+
+                        gt.append(mels[bib, :, (random_start * 2):((random_start+mel_len) * 2)])
+                        y = waves[bib][(random_start * 2) * 300:((random_start+mel_len) * 2) * 300]
+                        wav.append(torch.from_numpy(y).to(device))
+
+                    wav = torch.stack(wav).float().detach()
+
+                    en = torch.stack(en)
+                    p_en = torch.stack(p_en)
+                    gt = torch.stack(gt).detach()
+                    s = model.predictor_encoder(gt)
+
+                    F0_fake, N_fake = model.predictor(texts=p_en, style=s_dur, f0=True)
+
+                    loss_dur = 0
+                    for _s2s_pred, _text_input, _text_length in zip(d, (d_gt), input_lengths):
+                        _s2s_pred = _s2s_pred[:_text_length, :]
+                        _text_input = _text_input[:_text_length].long()
+                        _s2s_trg = torch.zeros_like(_s2s_pred)
+                        for bib in range(_s2s_trg.shape[0]):
+                            _s2s_trg[bib, :_text_input[bib]] = 1
+                        _dur_pred = torch.sigmoid(_s2s_pred).sum(axis=1)
+                        loss_dur += F.l1_loss(_dur_pred[1:_text_length-1], 
+                                               _text_input[1:_text_length-1])
+
+                    loss_dur /= texts.size(0)
+
+                    s = model.style_encoder(gt)
+
+                    try:
+                        y_rec = model.decoder(en, F0_fake, N_fake, s)
+                    except Exception as e:
+                        accelerator.print(str(e))
+                        accelerator.print(F0_real.size())
+                        accelerator.print(F0_real.squeeze(0).size())
+                        
+                    try:
+                        
+                        loss_mel = stft_loss(y_rec.squeeze(), wav.detach())
+
+                        F0_real, _, F0 = model.pitch_extractor(gt.unsqueeze(1)) 
+
+                        loss_F0 = F.l1_loss(F0_real, F0_fake) / 10
+                    
+                    except Exception as e:
+                        accelerator.print(str(e))
+                        accelerator.print(F0_real.size())
+                        accelerator.print(F0_real.squeeze(0).size())
+                        
+
+                    loss_test += accelerator.gather(loss_mel).mean()
+                    loss_align += accelerator.gather(loss_dur).mean()
+                    loss_f += accelerator.gather(loss_F0).mean()
+
+                    iters_test += 1
+                except Exception as e:
+                    accelerator.print(e)
+                    accelerator.print('ooh something wrong!')
+                    iters_test +=1
+                    continue
+        if accelerator.is_main_process:
+            print('Epochs:', epoch + 1)
+            log_print('Validation loss: %.3f, Dur loss: %.3f, F0 loss: %.3f' % (loss_test / iters_test, loss_align / iters_test, loss_f / iters_test) + '\n\n\n', logger)
+            print('\n\n\n')
+            writer.add_scalar('eval/mel_loss', loss_test / iters_test, epoch + 1)
+            writer.add_scalar('eval/dur_loss', loss_test / iters_test, epoch + 1)
+            writer.add_scalar('eval/F0_loss', loss_f / iters_test, epoch + 1)
+        
+        
+        if (epoch + 1) % save_freq == 0 :
+            if (loss_test / iters_test) < best_loss:
+                best_loss = loss_test / iters_test
+            print('Saving..')
+            state = {
+                'net':  {key: model[key].state_dict() for key in model}, 
+                'optimizer': optimizer.state_dict(),
+                'iters': iters,
+                'val_loss': loss_test / iters_test,
+                'epoch': epoch,
+            }
+            save_path = osp.join(log_dir, 'epoch_2nd_%05d.pth' % epoch)
+            torch.save(state, save_path)
+
+            # if estimate sigma, save the estimated simga
+            if model_params.diffusion.dist.estimate_sigma_data:
+                config['model_params']['diffusion']['dist']['sigma_data'] = float(np.mean(running_std))
+
+                with open(osp.join(log_dir, osp.basename(config_path)), 'w') as outfile:
+                    yaml.dump(config, outfile, default_flow_style=True)
+
+                            
+if __name__=="__main__":
+    main()