codeclm/tokenizer/Flow1dVAE/model_septoken.py

import yaml
import random
import inspect
import numpy as np
from tqdm import tqdm
import typing as tp
from abc import ABC

import torch
import torch.nn as nn
import torch.nn.functional as F
import torchaudio

from einops import repeat
from tools.torch_tools import wav_to_fbank

from diffusers.utils.torch_utils import randn_tensor
from transformers import HubertModel
from libs.rvq.descript_quantize3 import ResidualVectorQuantize

from models_gpt.models.gpt2_rope2_time_new_correct_mask_noncasual_reflow import GPT2Model
from models_gpt.models.gpt2_config import GPT2Config

from torch.cuda.amp import autocast
from our_MERT_BESTRQ.test import load_model

class HubertModelWithFinalProj(HubertModel):
    def __init__(self, config):
        super().__init__(config)

        # The final projection layer is only used for backward compatibility.
        # Following https://github.com/auspicious3000/contentvec/issues/6
        # Remove this layer is necessary to achieve the desired outcome.
        print("hidden_size:",config.hidden_size)
        print("classifier_proj_size:",config.classifier_proj_size)
        self.final_proj = nn.Linear(config.hidden_size, config.classifier_proj_size)


class SampleProcessor(torch.nn.Module):
    def project_sample(self, x: torch.Tensor):
        """Project the original sample to the 'space' where the diffusion will happen."""
        """Project back from diffusion space to the actual sample space."""
        return z

class Feature1DProcessor(SampleProcessor):
    def __init__(self, dim: int = 100, power_std = 1., \

                 num_samples: int = 100_000, cal_num_frames: int = 600):
        super().__init__()

        self.num_samples = num_samples
        self.dim = dim
        self.power_std = power_std
        self.cal_num_frames = cal_num_frames
        self.register_buffer('counts', torch.zeros(1))
        self.register_buffer('sum_x', torch.zeros(dim))
        self.register_buffer('sum_x2', torch.zeros(dim))
        self.register_buffer('sum_target_x2', torch.zeros(dim))
        self.counts: torch.Tensor
        self.sum_x: torch.Tensor
        self.sum_x2: torch.Tensor

    @property
    def mean(self):
        mean = self.sum_x / self.counts
        if(self.counts < 10):
            mean = torch.zeros_like(mean)
        return mean

    @property
    def std(self):
        std = (self.sum_x2 / self.counts - self.mean**2).clamp(min=0).sqrt()
        if(self.counts < 10):
            std = torch.ones_like(std)
        return std

    @property
    def target_std(self):
        return 1

    def project_sample(self, x: torch.Tensor):
        assert x.dim() == 3
        if self.counts.item() < self.num_samples:
            self.counts += len(x)
            self.sum_x += x[:,:,0:self.cal_num_frames].mean(dim=(2,)).sum(dim=0)
            self.sum_x2 += x[:,:,0:self.cal_num_frames].pow(2).mean(dim=(2,)).sum(dim=0)
        rescale = (self.target_std / self.std.clamp(min=1e-12)) ** self.power_std  # same output size
        x = (x - self.mean.view(1, -1, 1)) * rescale.view(1, -1, 1)
        return x

    def return_sample(self, x: torch.Tensor):
        assert x.dim() == 3
        rescale = (self.std / self.target_std) ** self.power_std
        x = x * rescale.view(1, -1, 1) + self.mean.view(1, -1, 1)
        return x

def pad_or_tunc_tolen(prior_text_encoder_hidden_states, prior_text_mask, prior_prompt_embeds, len_size=77):
    if(prior_text_encoder_hidden_states.shape[1]<len_size):
        prior_text_encoder_hidden_states = torch.cat([prior_text_encoder_hidden_states, \
            torch.zeros(prior_text_mask.shape[0], len_size-prior_text_mask.shape[1], \
            prior_text_encoder_hidden_states.shape[2], device=prior_text_mask.device, \
            dtype=prior_text_encoder_hidden_states.dtype)],1)
        prior_text_mask = torch.cat([prior_text_mask, torch.zeros(prior_text_mask.shape[0], len_size-prior_text_mask.shape[1], device=prior_text_mask.device, dtype=prior_text_mask.dtype)],1)
    else:
        prior_text_encoder_hidden_states = prior_text_encoder_hidden_states[:,0:len_size]
        prior_text_mask = prior_text_mask[:,0:len_size]
    prior_text_encoder_hidden_states = prior_text_encoder_hidden_states.permute(0,2,1).contiguous()
    return prior_text_encoder_hidden_states, prior_text_mask, prior_prompt_embeds

class BASECFM(torch.nn.Module, ABC):
    def __init__(

        self,

        estimator,

        mlp

    ):
        super().__init__()
        self.sigma_min = 1e-4

        self.estimator = estimator
        self.mlp = mlp

    @torch.inference_mode()
    def forward(self, mu, n_timesteps, temperature=1.0):
        """Forward diffusion



        Args:

            mu (torch.Tensor): output of encoder

                shape: (batch_size, n_channels, mel_timesteps, n_feats)

            n_timesteps (int): number of diffusion steps

            temperature (float, optional): temperature for scaling noise. Defaults to 1.0.



        Returns:

            sample: generated mel-spectrogram

                shape: (batch_size, n_channels, mel_timesteps, n_feats)

        """
        z = torch.randn_like(mu) * temperature
        t_span = torch.linspace(0, 1, n_timesteps + 1, device=mu.device)
        return self.solve_euler(z, t_span=t_span)

    def solve_euler(self, x, latent_mask_input,incontext_x, incontext_length, t_span, mu,attention_mask, guidance_scale):
        """

        Fixed euler solver for ODEs.

        Args:

            x (torch.Tensor): random noise

            t_span (torch.Tensor): n_timesteps interpolated

                shape: (n_timesteps + 1,)

            mu (torch.Tensor): output of encoder

                shape: (batch_size, n_channels, mel_timesteps, n_feats)

        """
        t, _, dt = t_span[0], t_span[-1], t_span[1] - t_span[0]
        noise = x.clone()

        # I am storing this because I can later plot it by putting a debugger here and saving it to a file
        # Or in future might add like a return_all_steps flag
        sol = []

        for step in tqdm(range(1, len(t_span))):
            x[:,0:incontext_length,:] = (1 - (1 - self.sigma_min) * t) * noise[:,0:incontext_length,:] + t * incontext_x[:,0:incontext_length,:]
            if(guidance_scale > 1.0):

                model_input = torch.cat([ \
                    torch.cat([latent_mask_input, latent_mask_input], 0), \
                    torch.cat([incontext_x, incontext_x], 0), \
                    torch.cat([torch.zeros_like(mu), mu], 0), \
                    torch.cat([x, x], 0), \
                    ], 2)
                timestep=t.unsqueeze(-1).repeat(2)

                dphi_dt = self.estimator(inputs_embeds=model_input, attention_mask=attention_mask,time_step=timestep).last_hidden_state
                dphi_dt_uncond, dhpi_dt_cond = dphi_dt.chunk(2,0)
                dphi_dt = dphi_dt_uncond + guidance_scale * (dhpi_dt_cond - dphi_dt_uncond)
            else:
                model_input = torch.cat([latent_mask_input, incontext_x, mu, x], 2)
                timestep=t.unsqueeze(-1)
                dphi_dt = self.estimator(inputs_embeds=model_input, attention_mask=attention_mask,time_step=timestep).last_hidden_state
            
            dphi_dt = dphi_dt[: ,:, -x.shape[2]:]
            x = x + dt * dphi_dt
            t = t + dt
            sol.append(x)
            if step < len(t_span) - 1:
                dt = t_span[step + 1] - t

        return sol[-1]

    def projection_loss(self,hidden_proj, bestrq_emb):
        bsz = hidden_proj.shape[0]

        hidden_proj_normalized = F.normalize(hidden_proj, dim=-1)
        bestrq_emb_normalized = F.normalize(bestrq_emb, dim=-1)

        proj_loss = -(hidden_proj_normalized * bestrq_emb_normalized).sum(dim=-1) 
        proj_loss = 1+proj_loss.mean()

        return proj_loss

    def compute_loss(self, x1, mu,  latent_masks,attention_mask,wav2vec_embeds, validation_mode=False):
        """Computes diffusion loss



        Args:

            x1 (torch.Tensor): Target

                shape: (batch_size, n_channels, mel_timesteps, n_feats)

            mu (torch.Tensor): output of encoder

                shape: (batch_size, n_channels, mel_timesteps, n_feats)



        Returns:

            loss: conditional flow matching loss

            y: conditional flow

                shape: (batch_size, n_channels, mel_timesteps, n_feats)

        """
        b = mu[0].shape[0]
        len_x = x1.shape[2]
        # random timestep
        if(validation_mode):
            t = torch.ones([b, 1, 1], device=mu[0].device, dtype=mu[0].dtype) * 0.5
        else:
            t = torch.rand([b, 1, 1], device=mu[0].device, dtype=mu[0].dtype)
        # sample noise p(x_0)
        z = torch.randn_like(x1)

        y = (1 - (1 - self.sigma_min) * t) * z + t * x1
        u = x1 - (1 - self.sigma_min) * z
        model_input = torch.cat([*mu,y], 2)
        t=t.squeeze(-1).squeeze(-1)
        out = self.estimator(inputs_embeds=model_input, attention_mask=attention_mask,time_step=t,output_hidden_states=True)
        hidden_layer_7 = out.hidden_states[7]
        hidden_proj = self.mlp(hidden_layer_7)      
        out = out.last_hidden_state      
        out=out[:,:,-len_x:]

        weight = (latent_masks > 1.5).unsqueeze(-1).repeat(1, 1, out.shape[-1]).float() + (latent_masks < 0.5).unsqueeze(-1).repeat(1, 1, out.shape[-1]).float() * 0.01
        loss_re = F.mse_loss(out * weight, u * weight, reduction="sum") / weight.sum()
        loss_cos = self.projection_loss(hidden_proj, wav2vec_embeds)
        loss = loss_re + loss_cos * 0.5
        return loss, loss_re, loss_cos

class PromptCondAudioDiffusion(nn.Module):
    def __init__(

        self,

        num_channels,

        unet_model_name=None,

        unet_model_config_path=None,

        snr_gamma=None,

        uncondition=True,

        out_paint=False,

    ):
        super().__init__()

        assert unet_model_name is not None or unet_model_config_path is not None, "Either UNet pretrain model name or a config file path is required"

        self.unet_model_name = unet_model_name
        self.unet_model_config_path = unet_model_config_path
        self.snr_gamma = snr_gamma
        self.uncondition = uncondition
        self.num_channels = num_channels

        # https://huggingface.co/docs/diffusers/v0.14.0/en/api/schedulers/overview
        self.normfeat = Feature1DProcessor(dim=64)

        self.sample_rate = 48000
        self.num_samples_perseg = self.sample_rate * 20 // 1000
        self.rsp48toclap = torchaudio.transforms.Resample(48000, 24000)
        self.rsq48towav2vec = torchaudio.transforms.Resample(48000, 16000)
        # self.wav2vec = Wav2Vec2BertModel.from_pretrained("facebook/w2v-bert-2.0", trust_remote_code=True)
        # self.wav2vec_processor = AutoFeatureExtractor.from_pretrained("facebook/w2v-bert-2.0", trust_remote_code=True)
        self.bestrq = load_model(
            model_dir='codeclm/tokenizer/Flow1dVAE/our_MERT_BESTRQ/mert_fairseq',
            checkpoint_dir='ckpt/encode-s12k.pt',
        )
        self.rsq48tobestrq = torchaudio.transforms.Resample(48000, 24000)
        self.rsq48tohubert = torchaudio.transforms.Resample(48000, 16000)
        for v in self.bestrq.parameters():v.requires_grad = False
        self.rvq_bestrq_emb = ResidualVectorQuantize(input_dim = 1024, n_codebooks = 1, codebook_size = 16_384, codebook_dim = 32, quantizer_dropout = 0.0, stale_tolerance=200)
        self.rvq_bestrq_bgm_emb = ResidualVectorQuantize(input_dim = 1024, n_codebooks = 1, codebook_size = 16_384, codebook_dim = 32, quantizer_dropout = 0.0, stale_tolerance=200)
        self.hubert = HubertModelWithFinalProj.from_pretrained("ckpt/models--lengyue233--content-vec-best/snapshots/c0b9ba13db21beaa4053faae94c102ebe326fd68")
        for v in self.hubert.parameters():v.requires_grad = False
        self.zero_cond_embedding1 = nn.Parameter(torch.randn(32*32,))
        # self.xvecmodel = XVECModel()
        config = GPT2Config(n_positions=1000,n_layer=16,n_head=20,n_embd=2200,n_inner=4400)
        unet = GPT2Model(config)
        mlp =  nn.Sequential(
            nn.Linear(2200, 1024), 
            nn.SiLU(),                  
            nn.Linear(1024, 1024),      
            nn.SiLU(),                 
            nn.Linear(1024, 768)  
        )
        self.set_from = "random"
        self.cfm_wrapper = BASECFM(unet, mlp)
        self.mask_emb = torch.nn.Embedding(3, 24)
        print("Transformer initialized from pretrain.")
        torch.cuda.empty_cache()

    def compute_snr(self, timesteps):
        """

        Computes SNR as per https://github.com/TiankaiHang/Min-SNR-Diffusion-Training/blob/521b624bd70c67cee4bdf49225915f5945a872e3/guided_diffusion/gaussian_diffusion.py#L847-L849

        """
        alphas_cumprod = self.noise_scheduler.alphas_cumprod
        sqrt_alphas_cumprod = alphas_cumprod**0.5
        sqrt_one_minus_alphas_cumprod = (1.0 - alphas_cumprod) ** 0.5

        # Expand the tensors.
        # Adapted from https://github.com/TiankaiHang/Min-SNR-Diffusion-Training/blob/521b624bd70c67cee4bdf49225915f5945a872e3/guided_diffusion/gaussian_diffusion.py#L1026
        sqrt_alphas_cumprod = sqrt_alphas_cumprod.to(device=timesteps.device)[timesteps].float()
        while len(sqrt_alphas_cumprod.shape) < len(timesteps.shape):
            sqrt_alphas_cumprod = sqrt_alphas_cumprod[..., None]
        alpha = sqrt_alphas_cumprod.expand(timesteps.shape)

        sqrt_one_minus_alphas_cumprod = sqrt_one_minus_alphas_cumprod.to(device=timesteps.device)[timesteps].float()
        while len(sqrt_one_minus_alphas_cumprod.shape) < len(timesteps.shape):
            sqrt_one_minus_alphas_cumprod = sqrt_one_minus_alphas_cumprod[..., None]
        sigma = sqrt_one_minus_alphas_cumprod.expand(timesteps.shape)

        # Compute SNR.
        snr = (alpha / sigma) ** 2
        return snr

    def preprocess_audio(self, input_audios, threshold=0.9):
        assert len(input_audios.shape) == 2, input_audios.shape
        norm_value = torch.ones_like(input_audios[:,0])
        max_volume = input_audios.abs().max(dim=-1)[0]
        norm_value[max_volume>threshold] = max_volume[max_volume>threshold] / threshold
        return input_audios/norm_value.unsqueeze(-1)

    def extract_wav2vec_embeds(self, input_audios,output_len):
        wav2vec_stride = 2

        wav2vec_embeds = self.hubert(self.rsq48tohubert(input_audios), output_hidden_states=True).hidden_states # 1, 4096, 1024
        wav2vec_embeds_last=wav2vec_embeds[-1]
        wav2vec_embeds_last=torch.nn.functional.interpolate(wav2vec_embeds_last.permute(0, 2, 1), size=output_len, mode='linear', align_corners=False).permute(0, 2, 1)
        return wav2vec_embeds_last

    def extract_mert_embeds(self, input_audios):
        prompt_stride = 3
        inputs = self.clap_embd_extractor.mulan.audio.processor(self.rsp48toclap(input_audios), sampling_rate=self.clap_embd_extractor.mulan.audio.sr, return_tensors="pt")
        input_values = inputs['input_values'].squeeze(0).to(input_audios.device, dtype = input_audios.dtype)
        prompt_embeds = self.clap_embd_extractor.mulan.audio.model(input_values, output_hidden_states=True).hidden_states # batch_size, Time steps, 1024 
        mert_emb= prompt_embeds[-1]
        mert_emb = torch.nn.functional.interpolate(mert_emb.permute(0, 2, 1), size=375, mode='linear', align_corners=False).permute(0, 2, 1)

        return mert_emb
    
    def extract_bestrq_embeds(self, input_audio_vocal_0,input_audio_vocal_1,layer):
        input_wav_mean = (input_audio_vocal_0 + input_audio_vocal_1) / 2.0
        input_wav_mean = self.bestrq(self.rsq48tobestrq(input_wav_mean), features_only = True)
        layer_results = input_wav_mean['layer_results']
        bestrq_emb = layer_results[layer]
        bestrq_emb = bestrq_emb.permute(0,2,1).contiguous()
        return bestrq_emb


    def extract_spk_embeds(self, input_audios):
        spk_embeds = self.xvecmodel(self.rsq48towav2vec(input_audios))
        spk_embeds = self.spk_linear(spk_embeds).reshape(spk_embeds.shape[0], 16, 1, 32)
        return spk_embeds

    def extract_lyric_feats(self, lyric):
        with torch.no_grad():
            try:
                text_encoder_hidden_states, text_mask, text_prompt_embeds = self.clap_embd_extractor(texts = lyric, return_one=False)
            except:
                text_encoder_hidden_states, text_mask, text_prompt_embeds = self.clap_embd_extractor(texts = [""] * len(lyric), return_one=False)
            text_encoder_hidden_states = text_encoder_hidden_states.to(self.device)
            text_mask = text_mask.to(self.device)
            text_encoder_hidden_states, text_mask, text_prompt_embeds = \
                pad_or_tunc_tolen(text_encoder_hidden_states, text_mask, text_prompt_embeds)
            text_encoder_hidden_states = text_encoder_hidden_states.permute(0,2,1).contiguous()
            return text_encoder_hidden_states, text_mask

    def extract_energy_bar(self, input_audios):
        if(input_audios.shape[-1] % self.num_samples_perseg > 0):
            energy_bar = input_audios[:,:-1 * (input_audios.shape[-1] % self.num_samples_perseg)].reshape(input_audios.shape[0],-1,self.num_samples_perseg)
        else:
            energy_bar = input_audios.reshape(input_audios.shape[0],-1,self.num_samples_perseg)
        energy_bar = (energy_bar.pow(2.0).mean(-1).sqrt() + 1e-6).log10() * 20 # B T
        energy_bar = (energy_bar / 2.0 + 16).clamp(0,16).int()
        energy_embedding = self.energy_embedding(energy_bar)
        energy_embedding = energy_embedding.view(energy_embedding.shape[0], energy_embedding.shape[1] // 2, 2, 32).reshape(energy_embedding.shape[0], energy_embedding.shape[1] // 2, 64).permute(0,2,1) # b 128 t
        return energy_embedding

    def forward(self, input_audios_vocal,input_audios_bgm, lyric, latents, latent_masks, validation_mode=False, \

        additional_feats = ['spk', 'lyric'], \

        train_rvq=True, train_ssl=False,layer_vocal=7,layer_bgm=7):
        if not hasattr(self,"device"):
            self.device = input_audios_vocal.device
        if not hasattr(self,"dtype"):
            self.dtype = input_audios_vocal.dtype
        device = self.device
        input_audio_vocal_0 = input_audios_vocal[:,0,:]
        input_audio_vocal_1 = input_audios_vocal[:,1,:]
        input_audio_vocal_0 = self.preprocess_audio(input_audio_vocal_0)
        input_audio_vocal_1 = self.preprocess_audio(input_audio_vocal_1)
        input_audios_vocal_wav2vec = (input_audio_vocal_0 + input_audio_vocal_1) / 2.0

        input_audio_bgm_0 = input_audios_bgm[:,0,:]
        input_audio_bgm_1 = input_audios_bgm[:,1,:]
        input_audio_bgm_0 = self.preprocess_audio(input_audio_bgm_0)
        input_audio_bgm_1 = self.preprocess_audio(input_audio_bgm_1)
        input_audios_bgm_wav2vec = (input_audio_bgm_0 + input_audio_bgm_1) / 2.0

        if(train_ssl):
            self.wav2vec.train()
            wav2vec_embeds = self.extract_wav2vec_embeds(input_audios)
            self.clap_embd_extractor.train()
            prompt_embeds = self.extract_mert_embeds(input_audios)
            if('spk' in additional_feats):
                self.xvecmodel.train()
                spk_embeds = self.extract_spk_embeds(input_audios).repeat(1,1,prompt_embeds.shape[-1]//2,1)
        else:
            with torch.no_grad():
                with autocast(enabled=False):
                    bestrq_emb = self.extract_bestrq_embeds(input_audio_vocal_0,input_audio_vocal_1,layer_vocal)
                    bestrq_emb_bgm = self.extract_bestrq_embeds(input_audio_bgm_0,input_audio_bgm_1,layer_bgm)
                    # mert_emb = self.extract_mert_embeds(input_audios_mert)
                    output_len = bestrq_emb.shape[2]
                    wav2vec_embeds = self.extract_wav2vec_embeds(input_audios_vocal_wav2vec+input_audios_bgm_wav2vec,output_len)


                bestrq_emb = bestrq_emb.detach()
                bestrq_emb_bgm = bestrq_emb_bgm.detach()

        if('lyric' in additional_feats):
            text_encoder_hidden_states, text_mask = self.extract_lyric_feats(lyric)
        else:
            text_encoder_hidden_states, text_mask = None, None


        if(train_rvq):
            quantized_bestrq_emb, _, _, commitment_loss_bestrq_emb, codebook_loss_bestrq_emb,_ = self.rvq_bestrq_emb(bestrq_emb) # b,d,t
            quantized_bestrq_emb_bgm, _, _, commitment_loss_bestrq_emb_bgm, codebook_loss_bestrq_emb_bgm,_ = self.rvq_bestrq_bgm_emb(bestrq_emb_bgm) # b,d,t
        else:
            bestrq_emb = bestrq_emb.float()
            self.rvq_bestrq_emb.eval()
            # with autocast(enabled=False):
            quantized_bestrq_emb, _, _, commitment_loss_bestrq_emb, codebook_loss_bestrq_emb,_ = self.rvq_bestrq_emb(bestrq_emb) # b,d,t
            commitment_loss_bestrq_emb = commitment_loss_bestrq_emb.detach()
            codebook_loss_bestrq_emb = codebook_loss_bestrq_emb.detach()
            quantized_bestrq_emb = quantized_bestrq_emb.detach()

        commitment_loss = commitment_loss_bestrq_emb+commitment_loss_bestrq_emb_bgm
        codebook_loss = codebook_loss_bestrq_emb+codebook_loss_bestrq_emb_bgm


        alpha=1
        quantized_bestrq_emb = quantized_bestrq_emb * alpha + bestrq_emb * (1-alpha)
        quantized_bestrq_emb_bgm = quantized_bestrq_emb_bgm * alpha + bestrq_emb_bgm * (1-alpha)


        

        scenario = np.random.choice(['start_seg', 'other_seg'])
        if(scenario == 'other_seg'):
            for binx in range(input_audios_vocal.shape[0]):
                # latent_masks[binx,0:64] = 1
                latent_masks[binx,0:random.randint(64,128)] = 1
        quantized_bestrq_emb = quantized_bestrq_emb.permute(0,2,1).contiguous()
        quantized_bestrq_emb_bgm = quantized_bestrq_emb_bgm.permute(0,2,1).contiguous()
        quantized_bestrq_emb = (latent_masks > 0.5).unsqueeze(-1) * quantized_bestrq_emb \
            + (latent_masks < 0.5).unsqueeze(-1) * self.zero_cond_embedding1.reshape(1,1,1024)
        quantized_bestrq_emb_bgm = (latent_masks > 0.5).unsqueeze(-1) * quantized_bestrq_emb_bgm \
            + (latent_masks < 0.5).unsqueeze(-1) * self.zero_cond_embedding1.reshape(1,1,1024)


        

        if self.uncondition:
            mask_indices = [k for k in range(quantized_bestrq_emb.shape[0]) if random.random() < 0.1]
            if len(mask_indices) > 0:
                quantized_bestrq_emb[mask_indices] = 0
                quantized_bestrq_emb_bgm[mask_indices] = 0
        latents = latents.permute(0,2,1).contiguous()
        latents = self.normfeat.project_sample(latents)
        latents = latents.permute(0,2,1).contiguous()
        incontext_latents = latents * ((latent_masks > 0.5) * (latent_masks < 1.5)).unsqueeze(-1).float()
        attention_mask=(latent_masks > 0.5)
        B, L = attention_mask.size()
        attention_mask = attention_mask.view(B, 1, L)
        attention_mask = attention_mask * attention_mask.transpose(-1, -2)
        attention_mask = attention_mask.unsqueeze(1)
        latent_mask_input = self.mask_emb(latent_masks)
        loss,loss_re, loss_cos = self.cfm_wrapper.compute_loss(latents, [latent_mask_input,incontext_latents, quantized_bestrq_emb,quantized_bestrq_emb_bgm],  latent_masks,attention_mask,wav2vec_embeds, validation_mode=validation_mode)
        return loss,loss_re, loss_cos, commitment_loss.mean(), codebook_loss.mean()

    def init_device_dtype(self, device, dtype):
        self.device = device
        self.dtype = dtype

    @torch.no_grad()
    def fetch_codes(self, input_audios_vocal,input_audios_bgm, additional_feats,layer_vocal=7,layer_bgm=7):
        input_audio_vocal_0 = input_audios_vocal[[0],:]
        input_audio_vocal_1 = input_audios_vocal[[1],:]
        input_audio_vocal_0 = self.preprocess_audio(input_audio_vocal_0)
        input_audio_vocal_1 = self.preprocess_audio(input_audio_vocal_1)
        input_audios_vocal_wav2vec = (input_audio_vocal_0 + input_audio_vocal_1) / 2.0

        input_audio_bgm_0 = input_audios_bgm[[0],:]
        input_audio_bgm_1 = input_audios_bgm[[1],:]
        input_audio_bgm_0 = self.preprocess_audio(input_audio_bgm_0)
        input_audio_bgm_1 = self.preprocess_audio(input_audio_bgm_1)
        input_audios_bgm_wav2vec = (input_audio_bgm_0 + input_audio_bgm_1) / 2.0

        self.bestrq.eval()

        # bestrq_middle,bestrq_last = self.extract_bestrq_embeds(input_audios)
        # bestrq_middle = bestrq_middle.detach()
        # bestrq_last = bestrq_last.detach()
        bestrq_emb = self.extract_bestrq_embeds(input_audio_vocal_0,input_audio_vocal_1,layer_vocal)
        bestrq_emb = bestrq_emb.detach()

        bestrq_emb_bgm = self.extract_bestrq_embeds(input_audio_bgm_0,input_audio_bgm_1,layer_bgm)
        bestrq_emb_bgm = bestrq_emb_bgm.detach()



        self.rvq_bestrq_emb.eval()
        quantized_bestrq_emb, codes_bestrq_emb, *_ = self.rvq_bestrq_emb(bestrq_emb) # b,d,t
        
        self.rvq_bestrq_bgm_emb.eval()
        quantized_bestrq_emb_bgm, codes_bestrq_emb_bgm, *_ = self.rvq_bestrq_bgm_emb(bestrq_emb_bgm) # b,d,t


        if('spk' in additional_feats):
            self.xvecmodel.eval()
            spk_embeds = self.extract_spk_embeds(input_audios)
        else:
            spk_embeds = None

        # return [codes_prompt, codes_wav2vec], [prompt_embeds, wav2vec_embeds], spk_embeds
        # return [codes_prompt_7, codes_prompt_13, codes_prompt_20, codes_wav2vec_half, codes_wav2vec_last], [prompt_embeds_7, prompt_embeds_13, prompt_embeds_20, wav2vec_embeds_half, wav2vec_embeds_last], spk_embeds
        # return [codes_bestrq_middle, codes_bestrq_last], [bestrq_middle, bestrq_last], spk_embeds
        return [codes_bestrq_emb,codes_bestrq_emb_bgm], [bestrq_emb,bestrq_emb_bgm], spk_embeds
        # return [codes_prompt_13, codes_wav2vec_last], [prompt_embeds_13, wav2vec_embeds_last], spk_embeds
    
    @torch.no_grad()
    def fetch_codes_batch(self, input_audios_vocal, input_audios_bgm, additional_feats,layer_vocal=7,layer_bgm=7):
        input_audio_vocal_0 = input_audios_vocal[:,0,:]
        input_audio_vocal_1 = input_audios_vocal[:,1,:]
        input_audio_vocal_0 = self.preprocess_audio(input_audio_vocal_0)
        input_audio_vocal_1 = self.preprocess_audio(input_audio_vocal_1)
        input_audios_vocal_wav2vec = (input_audio_vocal_0 + input_audio_vocal_1) / 2.0

        input_audio_bgm_0 = input_audios_bgm[:,0,:]
        input_audio_bgm_1 = input_audios_bgm[:,1,:]
        input_audio_bgm_0 = self.preprocess_audio(input_audio_bgm_0)
        input_audio_bgm_1 = self.preprocess_audio(input_audio_bgm_1)
        input_audios_bgm_wav2vec = (input_audio_bgm_0 + input_audio_bgm_1) / 2.0

        self.bestrq.eval()

        # bestrq_middle,bestrq_last = self.extract_bestrq_embeds(input_audios)
        # bestrq_middle = bestrq_middle.detach()
        # bestrq_last = bestrq_last.detach()
        bestrq_emb = self.extract_bestrq_embeds(input_audio_vocal_0,input_audio_vocal_1,layer_vocal)
        bestrq_emb = bestrq_emb.detach()

        bestrq_emb_bgm = self.extract_bestrq_embeds(input_audio_bgm_0,input_audio_bgm_1,layer_bgm)
        bestrq_emb_bgm = bestrq_emb_bgm.detach()



        self.rvq_bestrq_emb.eval()
        quantized_bestrq_emb, codes_bestrq_emb, *_ = self.rvq_bestrq_emb(bestrq_emb) # b,d,t
        
        self.rvq_bestrq_bgm_emb.eval()
        quantized_bestrq_emb_bgm, codes_bestrq_emb_bgm, *_ = self.rvq_bestrq_bgm_emb(bestrq_emb_bgm) # b,d,t


        if('spk' in additional_feats):
            self.xvecmodel.eval()
            spk_embeds = self.extract_spk_embeds(input_audios)
        else:
            spk_embeds = None

        # return [codes_prompt, codes_wav2vec], [prompt_embeds, wav2vec_embeds], spk_embeds
        # return [codes_prompt_7, codes_prompt_13, codes_prompt_20, codes_wav2vec_half, codes_wav2vec_last], [prompt_embeds_7, prompt_embeds_13, prompt_embeds_20, wav2vec_embeds_half, wav2vec_embeds_last], spk_embeds
        # return [codes_bestrq_middle, codes_bestrq_last], [bestrq_middle, bestrq_last], spk_embeds
        return [codes_bestrq_emb,codes_bestrq_emb_bgm], [bestrq_emb,bestrq_emb_bgm], spk_embeds
        # return [codes_prompt_13, codes_wav2vec_last], [prompt_embeds_13, wav2vec_embeds_last], spk_embeds


    @torch.no_grad()
    def inference_codes(self, codes, spk_embeds, true_latents, latent_length, additional_feats,incontext_length=127, 

                  guidance_scale=2, num_steps=20,

                  disable_progress=True, scenario='start_seg'):
        classifier_free_guidance = guidance_scale > 1.0
        device = self.device
        dtype = self.dtype
        # codes_bestrq_middle, codes_bestrq_last = codes
        codes_bestrq_emb,codes_bestrq_emb_bgm = codes


        batch_size = codes_bestrq_emb.shape[0]


        quantized_bestrq_emb,_,_=self.rvq_bestrq_emb.from_codes(codes_bestrq_emb)
        quantized_bestrq_emb_bgm,_,_=self.rvq_bestrq_bgm_emb.from_codes(codes_bestrq_emb_bgm)
        quantized_bestrq_emb = quantized_bestrq_emb.permute(0,2,1).contiguous()
        quantized_bestrq_emb_bgm = quantized_bestrq_emb_bgm.permute(0,2,1).contiguous()
        if('spk' in additional_feats):
            spk_embeds = spk_embeds.repeat(1,1,quantized_bestrq_emb.shape[-2],1).detach()

        num_frames = quantized_bestrq_emb.shape[1]

        num_channels_latents = self.num_channels
        shape = (batch_size,  num_frames, 64)
        latents = randn_tensor(shape, generator=None, device=device, dtype=dtype)



        latent_masks = torch.zeros(latents.shape[0], latents.shape[1], dtype=torch.int64, device=latents.device)
        latent_masks[:,0:latent_length] = 2
        if(scenario=='other_seg'):
            latent_masks[:,0:incontext_length] = 1

        

        quantized_bestrq_emb = (latent_masks > 0.5).unsqueeze(-1) * quantized_bestrq_emb \
            + (latent_masks < 0.5).unsqueeze(-1) * self.zero_cond_embedding1.reshape(1,1,1024)
        quantized_bestrq_emb_bgm = (latent_masks > 0.5).unsqueeze(-1) * quantized_bestrq_emb_bgm \
            + (latent_masks < 0.5).unsqueeze(-1) * self.zero_cond_embedding1.reshape(1,1,1024)
        true_latents = true_latents.permute(0,2,1).contiguous()
        true_latents = self.normfeat.project_sample(true_latents)
        true_latents = true_latents.permute(0,2,1).contiguous()
        incontext_latents = true_latents * ((latent_masks > 0.5) * (latent_masks < 1.5)).unsqueeze(-1).float()
        incontext_length = ((latent_masks > 0.5) * (latent_masks < 1.5)).sum(-1)[0]


        attention_mask=(latent_masks > 0.5)
        B, L = attention_mask.size()
        attention_mask = attention_mask.view(B, 1, L)
        attention_mask = attention_mask * attention_mask.transpose(-1, -2)
        attention_mask = attention_mask.unsqueeze(1)
        latent_mask_input = self.mask_emb(latent_masks)

        if('spk' in additional_feats):
            # additional_model_input = torch.cat([quantized_bestrq_middle, quantized_bestrq_last, spk_embeds],1)
            additional_model_input = torch.cat([quantized_bestrq_emb,quantized_bestrq_emb_bgm, spk_embeds],2)
        else:
            # additional_model_input = torch.cat([quantized_bestrq_middle, quantized_bestrq_last],1)
            additional_model_input = torch.cat([quantized_bestrq_emb,quantized_bestrq_emb_bgm],2)

        temperature = 1.0
        t_span = torch.linspace(0, 1, num_steps + 1, device=quantized_bestrq_emb.device)
        latents = self.cfm_wrapper.solve_euler(latents * temperature, latent_mask_input,incontext_latents, incontext_length, t_span, additional_model_input,attention_mask,  guidance_scale)

        latents[:,0:incontext_length,:] = incontext_latents[:,0:incontext_length,:]
        latents = latents.permute(0,2,1).contiguous()
        latents = self.normfeat.return_sample(latents)
        # latents = latents.permute(0,2,1).contiguous()
        return latents

    @torch.no_grad()
    def inference(self, input_audios_vocal,input_audios_bgm, lyric, true_latents, latent_length, additional_feats, guidance_scale=2, num_steps=20,

                  disable_progress=True,layer_vocal=7,layer_bgm=3,scenario='start_seg'):
        codes, embeds, spk_embeds = self.fetch_codes(input_audios_vocal,input_audios_bgm, additional_feats,layer_vocal,layer_bgm)

        latents = self.inference_codes(codes, spk_embeds, true_latents, latent_length, additional_feats, \
            guidance_scale=guidance_scale, num_steps=num_steps, \
            disable_progress=disable_progress,scenario=scenario)
        return latents

    def prepare_latents(self, batch_size, num_frames, num_channels_latents, dtype, device):
        divisor = 4
        shape = (batch_size, num_channels_latents, num_frames, 32)
        if(num_frames%divisor>0):
            num_frames = round(num_frames/float(divisor))*divisor
            shape = (batch_size, num_channels_latents, num_frames, 32)
        latents = randn_tensor(shape, generator=None, device=device, dtype=dtype)
        return latents