module/models.py

import copy
import math
import torch
from torch import nn
from torch.nn import functional as F

from module import commons
from module import modules
from module import attentions

from torch.nn import Conv1d, ConvTranspose1d, AvgPool1d, Conv2d
from torch.nn.utils import weight_norm, remove_weight_norm, spectral_norm
from module.commons import init_weights, get_padding
from module.mrte_model import MRTE
from module.quantize import  ResidualVectorQuantizer
from text import symbols
from torch.cuda.amp import autocast

class StochasticDurationPredictor(nn.Module):
    def __init__(self, in_channels, filter_channels, kernel_size, p_dropout, n_flows=4, gin_channels=0):
        super().__init__()
        filter_channels = in_channels  # it needs to be removed from future version.
        self.in_channels = in_channels
        self.filter_channels = filter_channels
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.n_flows = n_flows
        self.gin_channels = gin_channels

        self.log_flow = modules.Log()
        self.flows = nn.ModuleList()
        self.flows.append(modules.ElementwiseAffine(2))
        for i in range(n_flows):
            self.flows.append(modules.ConvFlow(2, filter_channels, kernel_size, n_layers=3))
            self.flows.append(modules.Flip())

        self.post_pre = nn.Conv1d(1, filter_channels, 1)
        self.post_proj = nn.Conv1d(filter_channels, filter_channels, 1)
        self.post_convs = modules.DDSConv(filter_channels, kernel_size, n_layers=3, p_dropout=p_dropout)
        self.post_flows = nn.ModuleList()
        self.post_flows.append(modules.ElementwiseAffine(2))
        for i in range(4):
            self.post_flows.append(modules.ConvFlow(2, filter_channels, kernel_size, n_layers=3))
            self.post_flows.append(modules.Flip())

        self.pre = nn.Conv1d(in_channels, filter_channels, 1)
        self.proj = nn.Conv1d(filter_channels, filter_channels, 1)
        self.convs = modules.DDSConv(filter_channels, kernel_size, n_layers=3, p_dropout=p_dropout)
        if gin_channels != 0:
            self.cond = nn.Conv1d(gin_channels, filter_channels, 1)

    def forward(self, x, x_mask, w=None, g=None, reverse=False, noise_scale=1.0):
        x = torch.detach(x)
        x = self.pre(x)
        if g is not None:
            g = torch.detach(g)
            x = x + self.cond(g)
        x = self.convs(x, x_mask)
        x = self.proj(x) * x_mask

        if not reverse:
            flows = self.flows
            assert w is not None

            logdet_tot_q = 0
            h_w = self.post_pre(w)
            h_w = self.post_convs(h_w, x_mask)
            h_w = self.post_proj(h_w) * x_mask
            e_q = torch.randn(w.size(0), 2, w.size(2)).to(device=x.device, dtype=x.dtype) * x_mask
            z_q = e_q
            for flow in self.post_flows:
                z_q, logdet_q = flow(z_q, x_mask, g=(x + h_w))
                logdet_tot_q += logdet_q
            z_u, z1 = torch.split(z_q, [1, 1], 1)
            u = torch.sigmoid(z_u) * x_mask
            z0 = (w - u) * x_mask
            logdet_tot_q += torch.sum((F.logsigmoid(z_u) + F.logsigmoid(-z_u)) * x_mask, [1, 2])
            logq = torch.sum(-0.5 * (math.log(2 * math.pi) + (e_q ** 2)) * x_mask, [1, 2]) - logdet_tot_q

            logdet_tot = 0
            z0, logdet = self.log_flow(z0, x_mask)
            logdet_tot += logdet
            z = torch.cat([z0, z1], 1)
            for flow in flows:
                z, logdet = flow(z, x_mask, g=x, reverse=reverse)
                logdet_tot = logdet_tot + logdet
            nll = torch.sum(0.5 * (math.log(2 * math.pi) + (z ** 2)) * x_mask, [1, 2]) - logdet_tot
            return nll + logq  # [b]
        else:
            flows = list(reversed(self.flows))
            flows = flows[:-2] + [flows[-1]]  # remove a useless vflow
            z = torch.randn(x.size(0), 2, x.size(2)).to(device=x.device, dtype=x.dtype) * noise_scale
            for flow in flows:
                z = flow(z, x_mask, g=x, reverse=reverse)
            z0, z1 = torch.split(z, [1, 1], 1)
            logw = z0
            return logw


class DurationPredictor(nn.Module):
    def __init__(self, in_channels, filter_channels, kernel_size, p_dropout, gin_channels=0):
        super().__init__()

        self.in_channels = in_channels
        self.filter_channels = filter_channels
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.gin_channels = gin_channels

        self.drop = nn.Dropout(p_dropout)
        self.conv_1 = nn.Conv1d(in_channels, filter_channels, kernel_size, padding=kernel_size // 2)
        self.norm_1 = modules.LayerNorm(filter_channels)
        self.conv_2 = nn.Conv1d(filter_channels, filter_channels, kernel_size, padding=kernel_size // 2)
        self.norm_2 = modules.LayerNorm(filter_channels)
        self.proj = nn.Conv1d(filter_channels, 1, 1)

        if gin_channels != 0:
            self.cond = nn.Conv1d(gin_channels, in_channels, 1)

    def forward(self, x, x_mask, g=None):
        x = torch.detach(x)
        if g is not None:
            g = torch.detach(g)
            x = x + self.cond(g)
        x = self.conv_1(x * x_mask)
        x = torch.relu(x)
        x = self.norm_1(x)
        x = self.drop(x)
        x = self.conv_2(x * x_mask)
        x = torch.relu(x)
        x = self.norm_2(x)
        x = self.drop(x)
        x = self.proj(x * x_mask)
        return x * x_mask


class TextEncoder(nn.Module):
    def __init__(self,
                 out_channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 latent_channels=192):
        super().__init__()
        self.out_channels = out_channels
        self.hidden_channels = hidden_channels
        self.filter_channels = filter_channels
        self.n_heads = n_heads
        self.n_layers = n_layers
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.latent_channels = latent_channels

        self.ssl_proj = nn.Conv1d(768, hidden_channels, 1)

        self.encoder_ssl = attentions.Encoder(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers//2,
            kernel_size,
            p_dropout)

        self.encoder_text = attentions.Encoder(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers,
            kernel_size,
            p_dropout)
        self.text_embedding = nn.Embedding(len(symbols), hidden_channels)

        self.mrte = MRTE()

        self.encoder2 = attentions.Encoder(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers//2,
            kernel_size,
            p_dropout)


        self.proj = nn.Conv1d(hidden_channels, out_channels * 2, 1)

    def forward(self, y, y_lengths, text, text_lengths, ge, test=None):
        y_mask = torch.unsqueeze(commons.sequence_mask(y_lengths, y.size(2)), 1).to(y.dtype)

        y = self.ssl_proj(y * y_mask) * y_mask
        y = self.encoder_ssl(y * y_mask, y_mask)

        text_mask = torch.unsqueeze(commons.sequence_mask(text_lengths, text.size(1)), 1).to(y.dtype)
        if test == 1 :
            text[:, :] = 0
        text = self.text_embedding(text).transpose(1, 2)
        text = self.encoder_text(text * text_mask, text_mask)
        y = self.mrte(y, y_mask, text, text_mask, ge)

        y = self.encoder2(y * y_mask, y_mask)

        stats = self.proj(y) * y_mask
        m, logs = torch.split(stats, self.out_channels, dim=1)
        return y, m, logs, y_mask

    def extract_latent(self, x):
        x = self.ssl_proj(x)
        quantized, codes, commit_loss, quantized_list = self.quantizer(x)
        return codes.transpose(0,1)
    def decode_latent(self, codes, y_mask, refer,refer_mask, ge):

        quantized = self.quantizer.decode(codes)

        y = self.vq_proj(quantized) * y_mask
        y = self.encoder_ssl(y * y_mask, y_mask)

        y = self.mrte(y, y_mask, refer, refer_mask, ge)

        y = self.encoder2(y * y_mask, y_mask)

        stats = self.proj(y) * y_mask
        m, logs = torch.split(stats, self.out_channels, dim=1)
        return y, m, logs, y_mask, quantized

class ResidualCouplingBlock(nn.Module):
    def __init__(self,
                 channels,
                 hidden_channels,
                 kernel_size,
                 dilation_rate,
                 n_layers,
                 n_flows=4,
                 gin_channels=0):
        super().__init__()
        self.channels = channels
        self.hidden_channels = hidden_channels
        self.kernel_size = kernel_size
        self.dilation_rate = dilation_rate
        self.n_layers = n_layers
        self.n_flows = n_flows
        self.gin_channels = gin_channels

        self.flows = nn.ModuleList()
        for i in range(n_flows):
            self.flows.append(
                modules.ResidualCouplingLayer(channels, hidden_channels, kernel_size, dilation_rate, n_layers,
                                              gin_channels=gin_channels, mean_only=True))
            self.flows.append(modules.Flip())

    def forward(self, x, x_mask, g=None, reverse=False):
        if not reverse:
            for flow in self.flows:
                x, _ = flow(x, x_mask, g=g, reverse=reverse)
        else:
            for flow in reversed(self.flows):
                x = flow(x, x_mask, g=g, reverse=reverse)
        return x


class PosteriorEncoder(nn.Module):
    def __init__(self,
                 in_channels,
                 out_channels,
                 hidden_channels,
                 kernel_size,
                 dilation_rate,
                 n_layers,
                 gin_channels=0):
        super().__init__()
        self.in_channels = in_channels
        self.out_channels = out_channels
        self.hidden_channels = hidden_channels
        self.kernel_size = kernel_size
        self.dilation_rate = dilation_rate
        self.n_layers = n_layers
        self.gin_channels = gin_channels

        self.pre = nn.Conv1d(in_channels, hidden_channels, 1)
        self.enc = modules.WN(hidden_channels, kernel_size, dilation_rate, n_layers, gin_channels=gin_channels)
        self.proj = nn.Conv1d(hidden_channels, out_channels * 2, 1)

    def forward(self, x, x_lengths, g=None):
        if(g!=None):
            g = g.detach()
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)
        x = self.pre(x) * x_mask
        x = self.enc(x, x_mask, g=g)
        stats = self.proj(x) * x_mask
        m, logs = torch.split(stats, self.out_channels, dim=1)
        z = (m + torch.randn_like(m) * torch.exp(logs)) * x_mask
        return z, m, logs, x_mask


class WNEncoder(nn.Module):
    def __init__(self,
                 in_channels,
                 out_channels,
                 hidden_channels,
                 kernel_size,
                 dilation_rate,
                 n_layers,
                 gin_channels=0):
        super().__init__()
        self.in_channels = in_channels
        self.out_channels = out_channels
        self.hidden_channels = hidden_channels
        self.kernel_size = kernel_size
        self.dilation_rate = dilation_rate
        self.n_layers = n_layers
        self.gin_channels = gin_channels

        self.pre = nn.Conv1d(in_channels, hidden_channels, 1)
        self.enc = modules.WN(hidden_channels, kernel_size, dilation_rate, n_layers, gin_channels=gin_channels)
        self.proj = nn.Conv1d(hidden_channels, out_channels, 1)
        self.norm = modules.LayerNorm(out_channels)
    def forward(self, x, x_lengths, g=None):
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)
        x = self.pre(x) * x_mask
        x = self.enc(x, x_mask, g=g)
        out = self.proj(x) * x_mask
        out = self.norm(out)
        return out


class Generator(torch.nn.Module):
    def __init__(self, initial_channel, resblock, resblock_kernel_sizes, resblock_dilation_sizes, upsample_rates,
                 upsample_initial_channel, upsample_kernel_sizes, gin_channels=0):
        super(Generator, self).__init__()
        self.num_kernels = len(resblock_kernel_sizes)
        self.num_upsamples = len(upsample_rates)
        self.conv_pre = Conv1d(initial_channel, upsample_initial_channel, 7, 1, padding=3)
        resblock = modules.ResBlock1 if resblock == '1' else modules.ResBlock2

        self.ups = nn.ModuleList()
        for i, (u, k) in enumerate(zip(upsample_rates, upsample_kernel_sizes)):
            self.ups.append(weight_norm(
                ConvTranspose1d(upsample_initial_channel // (2 ** i), upsample_initial_channel // (2 ** (i + 1)),
                                k, u, padding=(k - u) // 2)))

        self.resblocks = nn.ModuleList()
        for i in range(len(self.ups)):
            ch = upsample_initial_channel // (2 ** (i + 1))
            for j, (k, d) in enumerate(zip(resblock_kernel_sizes, resblock_dilation_sizes)):
                self.resblocks.append(resblock(ch, k, d))

        self.conv_post = Conv1d(ch, 1, 7, 1, padding=3, bias=False)
        self.ups.apply(init_weights)

        if gin_channels != 0:
            self.cond = nn.Conv1d(gin_channels, upsample_initial_channel, 1)

    def forward(self, x, g=None):
        x = self.conv_pre(x)
        if g is not None:
            x = x + self.cond(g)

        for i in range(self.num_upsamples):
            x = F.leaky_relu(x, modules.LRELU_SLOPE)
            x = self.ups[i](x)
            xs = None
            for j in range(self.num_kernels):
                if xs is None:
                    xs = self.resblocks[i * self.num_kernels + j](x)
                else:
                    xs += self.resblocks[i * self.num_kernels + j](x)
            x = xs / self.num_kernels
        x = F.leaky_relu(x)
        x = self.conv_post(x)
        x = torch.tanh(x)

        return x

    def remove_weight_norm(self):
        print('Removing weight norm...')
        for l in self.ups:
            remove_weight_norm(l)
        for l in self.resblocks:
            l.remove_weight_norm()


class DiscriminatorP(torch.nn.Module):
    def __init__(self, period, kernel_size=5, stride=3, use_spectral_norm=False):
        super(DiscriminatorP, self).__init__()
        self.period = period
        self.use_spectral_norm = use_spectral_norm
        norm_f = weight_norm if use_spectral_norm == False else spectral_norm
        self.convs = nn.ModuleList([
            norm_f(Conv2d(1, 32, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(32, 128, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(128, 512, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(512, 1024, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(1024, 1024, (kernel_size, 1), 1, padding=(get_padding(kernel_size, 1), 0))),
        ])
        self.conv_post = norm_f(Conv2d(1024, 1, (3, 1), 1, padding=(1, 0)))

    def forward(self, x):
        fmap = []

        # 1d to 2d
        b, c, t = x.shape
        if t % self.period != 0:  # pad first
            n_pad = self.period - (t % self.period)
            x = F.pad(x, (0, n_pad), "reflect")
            t = t + n_pad
        x = x.view(b, c, t // self.period, self.period)

        for l in self.convs:
            x = l(x)
            x = F.leaky_relu(x, modules.LRELU_SLOPE)
            fmap.append(x)
        x = self.conv_post(x)
        fmap.append(x)
        x = torch.flatten(x, 1, -1)

        return x, fmap


class DiscriminatorS(torch.nn.Module):
    def __init__(self, use_spectral_norm=False):
        super(DiscriminatorS, self).__init__()
        norm_f = weight_norm if use_spectral_norm == False else spectral_norm
        self.convs = nn.ModuleList([
            norm_f(Conv1d(1, 16, 15, 1, padding=7)),
            norm_f(Conv1d(16, 64, 41, 4, groups=4, padding=20)),
            norm_f(Conv1d(64, 256, 41, 4, groups=16, padding=20)),
            norm_f(Conv1d(256, 1024, 41, 4, groups=64, padding=20)),
            norm_f(Conv1d(1024, 1024, 41, 4, groups=256, padding=20)),
            norm_f(Conv1d(1024, 1024, 5, 1, padding=2)),
        ])
        self.conv_post = norm_f(Conv1d(1024, 1, 3, 1, padding=1))

    def forward(self, x):
        fmap = []

        for l in self.convs:
            x = l(x)
            x = F.leaky_relu(x, modules.LRELU_SLOPE)
            fmap.append(x)
        x = self.conv_post(x)
        fmap.append(x)
        x = torch.flatten(x, 1, -1)

        return x, fmap


class MultiPeriodDiscriminator(torch.nn.Module):
    def __init__(self, use_spectral_norm=False):
        super(MultiPeriodDiscriminator, self).__init__()
        periods = [2, 3, 5, 7, 11]

        discs = [DiscriminatorS(use_spectral_norm=use_spectral_norm)]
        discs = discs + [DiscriminatorP(i, use_spectral_norm=use_spectral_norm) for i in periods]
        self.discriminators = nn.ModuleList(discs)

    def forward(self, y, y_hat):
        y_d_rs = []
        y_d_gs = []
        fmap_rs = []
        fmap_gs = []
        for i, d in enumerate(self.discriminators):
            y_d_r, fmap_r = d(y)
            y_d_g, fmap_g = d(y_hat)
            y_d_rs.append(y_d_r)
            y_d_gs.append(y_d_g)
            fmap_rs.append(fmap_r)
            fmap_gs.append(fmap_g)

        return y_d_rs, y_d_gs, fmap_rs, fmap_gs

class ReferenceEncoder(nn.Module):
    '''
    inputs --- [N, Ty/r, n_mels*r]  mels
    outputs --- [N, ref_enc_gru_size]
    '''

    def __init__(self, spec_channels, gin_channels=0):

        super().__init__()
        self.spec_channels = spec_channels
        ref_enc_filters = [32, 32, 64, 64, 128, 128]
        K = len(ref_enc_filters)
        filters = [1] + ref_enc_filters
        convs = [weight_norm(nn.Conv2d(in_channels=filters[i],
                                       out_channels=filters[i + 1],
                                       kernel_size=(3, 3),
                                       stride=(2, 2),
                                       padding=(1, 1))) for i in range(K)]
        self.convs = nn.ModuleList(convs)
        # self.wns = nn.ModuleList([weight_norm(num_features=ref_enc_filters[i]) for i in range(K)])

        out_channels = self.calculate_channels(spec_channels, 3, 2, 1, K)
        self.gru = nn.GRU(input_size=ref_enc_filters[-1] * out_channels,
                          hidden_size=256 // 2,
                          batch_first=True)
        self.proj = nn.Linear(128, gin_channels)

    def forward(self, inputs):
        N = inputs.size(0)
        out = inputs.view(N, 1, -1, self.spec_channels)  # [N, 1, Ty, n_freqs]
        for conv in self.convs:
            out = conv(out)
            # out = wn(out)
            out = F.relu(out)  # [N, 128, Ty//2^K, n_mels//2^K]

        out = out.transpose(1, 2)  # [N, Ty//2^K, 128, n_mels//2^K]
        T = out.size(1)
        N = out.size(0)
        out = out.contiguous().view(N, T, -1)  # [N, Ty//2^K, 128*n_mels//2^K]

        self.gru.flatten_parameters()
        memory, out = self.gru(out)  # out --- [1, N, 128]

        return self.proj(out.squeeze(0)).unsqueeze(-1)

    def calculate_channels(self, L, kernel_size, stride, pad, n_convs):
        for i in range(n_convs):
            L = (L - kernel_size + 2 * pad) // stride + 1
        return L


class Quantizer_module(torch.nn.Module):
    def __init__(self, n_e, e_dim):
        super(Quantizer_module, self).__init__()
        self.embedding = nn.Embedding(n_e, e_dim)
        self.embedding.weight.data.uniform_(-1.0 / n_e, 1.0 / n_e)

    def forward(self, x):
        d = torch.sum(x ** 2, 1, keepdim=True) + torch.sum(self.embedding.weight ** 2, 1) - 2 * torch.matmul(x, self.embedding.weight.T)
        min_indicies = torch.argmin(d, 1)
        z_q = self.embedding(min_indicies)
        return z_q, min_indicies

class Quantizer(torch.nn.Module):
    def __init__(self, embed_dim=512, n_code_groups=4, n_codes=160):
        super(Quantizer, self).__init__()
        assert embed_dim % n_code_groups == 0
        self.quantizer_modules = nn.ModuleList([
            Quantizer_module(n_codes, embed_dim // n_code_groups) for _ in range(n_code_groups)
        ])
        self.n_code_groups = n_code_groups
        self.embed_dim = embed_dim

    def forward(self, xin):
        #B, C, T
        B, C, T = xin.shape
        xin = xin.transpose(1, 2)
        x = xin.reshape(-1, self.embed_dim)
        x = torch.split(x, self.embed_dim // self.n_code_groups, dim=-1)
        min_indicies = []
        z_q = []
        for _x, m in zip(x, self.quantizer_modules):
            _z_q, _min_indicies = m(_x)
            z_q.append(_z_q)
            min_indicies.append(_min_indicies) #B * T,
        z_q = torch.cat(z_q, -1).reshape(xin.shape)
        loss = 0.25 * torch.mean((z_q.detach() - xin) ** 2) + torch.mean((z_q - xin.detach()) ** 2)
        z_q = xin + (z_q - xin).detach()
        z_q = z_q.transpose(1, 2)
        codes = torch.stack(min_indicies, -1).reshape(B, T, self.n_code_groups)
        return z_q, loss, codes.transpose(1, 2)

    def embed(self, x):
        #idx: N, 4, T
        x=x.transpose(1, 2)
        x = torch.split(x, 1, 2)
        ret = []
        for q, embed in zip(x, self.quantizer_modules):
            q = embed.embedding(q.squeeze(-1))
            ret.append(q)
        ret = torch.cat(ret, -1)
        return ret.transpose(1, 2) #N, C, T


class CodePredictor(nn.Module):
    def __init__(self,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 n_q=8,
                 dims=1024,
                 ssl_dim=768
                 ):
        super().__init__()
        self.hidden_channels = hidden_channels
        self.filter_channels = filter_channels
        self.n_heads = n_heads
        self.n_layers = n_layers
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout

        self.vq_proj = nn.Conv1d(ssl_dim, hidden_channels, 1)
        self.ref_enc = modules.MelStyleEncoder(ssl_dim, style_vector_dim=hidden_channels)

        self.encoder = attentions.Encoder(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers,
            kernel_size,
            p_dropout)

        self.out_proj = nn.Conv1d(hidden_channels, (n_q-1) * dims, 1)
        self.n_q = n_q
        self.dims = dims
    def forward(self, x, x_mask, refer, codes, infer=False):
        x = x.detach()
        x = self.vq_proj(x * x_mask) * x_mask
        g = self.ref_enc(refer, x_mask)
        x = x + g
        x = self.encoder(x * x_mask, x_mask)
        x = self.out_proj(x * x_mask) * x_mask
        logits = x.reshape(x.shape[0], self.n_q - 1, self.dims, x.shape[-1]).transpose(2, 3)
        target = codes[1:].transpose(0, 1)
        if not infer:
            logits = logits.reshape(-1, self.dims)
            target = target.reshape(-1)
            loss = torch.nn.functional.cross_entropy(logits, target)
            return loss
        else:
            _, top10_preds = torch.topk(logits, 10, dim=-1)
            correct_top10 = torch.any(top10_preds == target.unsqueeze(-1), dim=-1)
            top3_acc = 100 * torch.mean(correct_top10.float()).detach().cpu().item()

            print('Top-10 Accuracy:', top3_acc, "%")

            pred_codes = torch.argmax(logits, dim=-1)
            acc = 100 * torch.mean((pred_codes == target).float()).detach().cpu().item()
            print('Top-1 Accuracy:', acc, "%")

            return pred_codes.transpose(0, 1)



class SynthesizerTrn(nn.Module):
    """
  Synthesizer for Training
  """

    def __init__(self,
                 spec_channels,
                 segment_size,
                 inter_channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 resblock,
                 resblock_kernel_sizes,
                 resblock_dilation_sizes,
                 upsample_rates,
                 upsample_initial_channel,
                 upsample_kernel_sizes,
                 n_speakers=0,
                 gin_channels=0,
                 use_sdp=True,
                 semantic_frame_rate=None,
                 freeze_quantizer=None,
                 **kwargs):

        super().__init__()
        self.spec_channels = spec_channels
        self.inter_channels = inter_channels
        self.hidden_channels = hidden_channels
        self.filter_channels = filter_channels
        self.n_heads = n_heads
        self.n_layers = n_layers
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.resblock = resblock
        self.resblock_kernel_sizes = resblock_kernel_sizes
        self.resblock_dilation_sizes = resblock_dilation_sizes
        self.upsample_rates = upsample_rates
        self.upsample_initial_channel = upsample_initial_channel
        self.upsample_kernel_sizes = upsample_kernel_sizes
        self.segment_size = segment_size
        self.n_speakers = n_speakers
        self.gin_channels = gin_channels

        self.use_sdp = use_sdp
        self.enc_p = TextEncoder(
                                 inter_channels,
                                 hidden_channels,
                                 filter_channels,
                                 n_heads,
                                 n_layers,
                                 kernel_size,
                                 p_dropout)
        self.dec = Generator(inter_channels, resblock, resblock_kernel_sizes, resblock_dilation_sizes, upsample_rates,
                             upsample_initial_channel, upsample_kernel_sizes, gin_channels=gin_channels)
        self.enc_q = PosteriorEncoder(spec_channels, inter_channels, hidden_channels, 5, 1, 16,
                                      gin_channels=gin_channels)
        self.flow = ResidualCouplingBlock(inter_channels, hidden_channels, 5, 1, 4, gin_channels=gin_channels)

        self.ref_enc = modules.MelStyleEncoder(spec_channels, style_vector_dim=gin_channels)

        ssl_dim = 768
        assert semantic_frame_rate in ['25hz', "50hz"]
        self.semantic_frame_rate = semantic_frame_rate
        if semantic_frame_rate == '25hz':
            self.ssl_proj = nn.Conv1d(ssl_dim, ssl_dim, 2, stride=2)
        else:
            self.ssl_proj = nn.Conv1d(ssl_dim, ssl_dim, 1, stride=1)

        self.quantizer = ResidualVectorQuantizer(
            dimension=ssl_dim,
            n_q=1,
            bins=1024
        )
        if freeze_quantizer:
            self.ssl_proj.requires_grad_(False)
            self.quantizer.requires_grad_(False)
            # self.enc_p.text_embedding.requires_grad_(False)
            # self.enc_p.encoder_text.requires_grad_(False)
            # self.enc_p.mrte.requires_grad_(False)

    def forward(self, ssl, y, y_lengths, text, text_lengths):
        y_mask = torch.unsqueeze(commons.sequence_mask(y_lengths, y.size(2)), 1).to(y.dtype)
        ge = self.ref_enc(y * y_mask, y_mask)

        with autocast(enabled=False):
            ssl = self.ssl_proj(ssl)
            quantized, codes, commit_loss, quantized_list = self.quantizer(ssl, layers=[0])

        if self.semantic_frame_rate == '25hz':
            quantized = F.interpolate(quantized, size=int(quantized.shape[-1] * 2), mode="nearest")

        x, m_p, logs_p, y_mask = self.enc_p(quantized, y_lengths, text, text_lengths, ge)
        z, m_q, logs_q, y_mask = self.enc_q(y, y_lengths, g=ge)
        z_p = self.flow(z, y_mask, g=ge)

        z_slice, ids_slice = commons.rand_slice_segments(z, y_lengths, self.segment_size)
        o = self.dec(z_slice, g=ge)
        return o, commit_loss, ids_slice, y_mask, y_mask, (z, z_p, m_p, logs_p, m_q, logs_q), quantized

    def infer(self, ssl, y, y_lengths, text, text_lengths, test=None, noise_scale=0.5):
        y_mask = torch.unsqueeze(commons.sequence_mask(y_lengths, y.size(2)), 1).to(y.dtype)
        ge = self.ref_enc(y * y_mask, y_mask)

        ssl =  self.ssl_proj(ssl)
        quantized, codes, commit_loss, _ = self.quantizer(ssl, layers=[0])
        if self.semantic_frame_rate == '25hz':
            quantized = F.interpolate(quantized, size=int(quantized.shape[-1] * 2), mode="nearest")

        x, m_p, logs_p, y_mask = self.enc_p(quantized, y_lengths, text, text_lengths, ge, test=test)
        z_p = m_p + torch.randn_like(m_p) * torch.exp(logs_p) * noise_scale

        z = self.flow(z_p, y_mask, g=ge, reverse=True)

        o = self.dec((z * y_mask)[:, :, :], g=ge)
        return o,y_mask, (z, z_p, m_p, logs_p)


    @torch.no_grad()
    def decode(self, codes,text, refer, noise_scale=0.5):
        refer_lengths = torch.LongTensor([refer.size(2)]).to(refer.device)
        refer_mask = torch.unsqueeze(commons.sequence_mask(refer_lengths, refer.size(2)), 1).to(refer.dtype)
        ge = self.ref_enc(refer * refer_mask, refer_mask)

        y_lengths = torch.LongTensor([codes.size(2)*2]).to(codes.device)
        text_lengths = torch.LongTensor([text.size(-1)]).to(text.device)

        quantized = self.quantizer.decode(codes)
        if self.semantic_frame_rate == '25hz':
            quantized = F.interpolate(quantized, size=int(quantized.shape[-1] * 2), mode="nearest")

        x, m_p, logs_p, y_mask = self.enc_p(quantized, y_lengths, text, text_lengths, ge)
        z_p = m_p + torch.randn_like(m_p) * torch.exp(logs_p) * noise_scale

        z = self.flow(z_p, y_mask, g=ge, reverse=True)

        o = self.dec((z * y_mask)[:, :, :], g=ge)
        return o

    def extract_latent(self, x):
        ssl =  self.ssl_proj(x)
        quantized, codes, commit_loss, quantized_list = self.quantizer(ssl)
        return codes.transpose(0,1)