bert_vits2/models.py

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

from bert_vits2 import commons
from bert_vits2 import modules
from bert_vits2 import attentions

from torch.nn import Conv1d, ConvTranspose1d, AvgPool1d, Conv2d
from torch.nn.utils import weight_norm, remove_weight_norm, spectral_norm
from vector_quantize_pytorch import VectorQuantize

from bert_vits2.commons import init_weights, get_padding
from bert_vits2.text import num_languages


class DurationDiscriminator(nn.Module):  # vits2
    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.dur_proj = nn.Conv1d(1, filter_channels, 1)

        self.pre_out_conv_1 = nn.Conv1d(2 * filter_channels, filter_channels, kernel_size, padding=kernel_size // 2)
        self.pre_out_norm_1 = modules.LayerNorm(filter_channels)
        self.pre_out_conv_2 = nn.Conv1d(filter_channels, filter_channels, kernel_size, padding=kernel_size // 2)
        self.pre_out_norm_2 = modules.LayerNorm(filter_channels)

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

        self.output_layer = nn.Sequential(
            nn.Linear(filter_channels, 1),
            nn.Sigmoid()
        )

    def forward_probability(self, x, x_mask, dur, g=None):
        dur = self.dur_proj(dur)
        x = torch.cat([x, dur], dim=1)
        x = self.pre_out_conv_1(x * x_mask)
        x = torch.relu(x)
        x = self.pre_out_norm_1(x)
        x = self.drop(x)
        x = self.pre_out_conv_2(x * x_mask)
        x = torch.relu(x)
        x = self.pre_out_norm_2(x)
        x = self.drop(x)
        x = x * x_mask
        x = x.transpose(1, 2)
        output_prob = self.output_layer(x)
        return output_prob

    def forward(self, x, x_mask, dur_r, dur_hat, 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)

        output_probs = []
        for dur in [dur_r, dur_hat]:
            output_prob = self.forward_probability(x, x_mask, dur, g)
            output_probs.append(output_prob)

        return output_probs


class Block(nn.Module):
    def __init__(self, in_dim, hidden_dim) -> None:
        super().__init__()
        self.norm = nn.LayerNorm(in_dim)
        self.mlp = MLP(in_dim, hidden_dim)

    def forward(self, x: torch.Tensor) -> torch.Tensor:
        x = x + self.mlp(self.norm(x))
        return x


class MLP(nn.Module):
    def __init__(self, in_dim, hidden_dim):
        super().__init__()
        self.c_fc1 = nn.Linear(in_dim, hidden_dim, bias=False)
        self.c_fc2 = nn.Linear(in_dim, hidden_dim, bias=False)
        self.c_proj = nn.Linear(hidden_dim, in_dim, bias=False)

    def forward(self, x: torch.Tensor):
        x = F.silu(self.c_fc1(x)) * self.c_fc2(x)
        x = self.c_proj(x)
        return x


class TransformerCouplingBlock(nn.Module):
    def __init__(self,
                 channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 n_flows=4,
                 gin_channels=0,
                 share_parameter=False
                 ):

        super().__init__()
        self.channels = channels
        self.hidden_channels = hidden_channels
        self.kernel_size = kernel_size
        self.n_layers = n_layers
        self.n_flows = n_flows
        self.gin_channels = gin_channels

        self.flows = nn.ModuleList()

        self.wn = attentions.FFT(hidden_channels, filter_channels, n_heads, n_layers, kernel_size, p_dropout,
                                 isflow=True, gin_channels=self.gin_channels) if share_parameter else None

        for i in range(n_flows):
            self.flows.append(
                modules.TransformerCouplingLayer(channels, hidden_channels, kernel_size, n_layers, n_heads, p_dropout,
                                                 filter_channels, mean_only=True, wn_sharing_parameter=self.wn,
                                                 gin_channels=self.gin_channels))
            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 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,
                 n_vocab,
                 out_channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 n_speakers,
                 gin_channels=0,
                 symbols=None,
                 ja_bert_dim=1024,
                 num_tones=None,
                 emotion_embedding=1,
                 zh_bert_extra=False,
                 ):
        super().__init__()
        self.n_vocab = n_vocab
        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.gin_channels = gin_channels
        self.emb = nn.Embedding(len(symbols), hidden_channels)
        nn.init.normal_(self.emb.weight, 0.0, hidden_channels ** -0.5)
        self.tone_emb = nn.Embedding(num_tones, hidden_channels)
        nn.init.normal_(self.tone_emb.weight, 0.0, hidden_channels ** -0.5)
        self.language_emb = nn.Embedding(num_languages, hidden_channels)
        nn.init.normal_(self.language_emb.weight, 0.0, hidden_channels ** -0.5)
        self.bert_proj = nn.Conv1d(1024, hidden_channels, 1)
        self.zh_bert_extra = zh_bert_extra
        if self.zh_bert_extra:
            self.bert_pre_proj = nn.Conv1d(2048, 1024, 1)
        self.ja_bert_proj = nn.Conv1d(ja_bert_dim, hidden_channels, 1)
        self.en_bert_proj = nn.Conv1d(1024, hidden_channels, 1)
        self.emotion_embedding = emotion_embedding

        if self.emotion_embedding == 1:
            self.emo_proj = nn.Linear(1024, 1024)
            self.emo_quantizer = VectorQuantize(
                dim=1024,
                codebook_size=10,
                decay=0.8,
                commitment_weight=1.0,
                learnable_codebook=True,
                ema_update=False,
            )
            self.emo_q_proj = nn.Linear(1024, hidden_channels)
        elif self.emotion_embedding == 2:
            self.in_feature_net = nn.Sequential(
                # input is assumed to an already normalized embedding
                nn.Linear(512, 1028, bias=False),
                nn.GELU(),
                nn.LayerNorm(1028),
                *[Block(1028, 512) for _ in range(1)],
                nn.Linear(1028, 512, bias=False),
                # normalize before passing to VQ?
                # nn.GELU(),
                # nn.LayerNorm(512),
            )
            self.emo_vq = VectorQuantize(
                dim=512,
                codebook_size=64,
                codebook_dim=32,
                commitment_weight=0.1,
                decay=0.85,
                heads=32,
                kmeans_iters=20,
                separate_codebook_per_head=True,
                stochastic_sample_codes=True,
                threshold_ema_dead_code=2,
            )
            self.out_feature_net = nn.Linear(512, hidden_channels)

        self.encoder = attentions.Encoder(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers,
            kernel_size,
            p_dropout,
            gin_channels=self.gin_channels)
        self.proj = nn.Conv1d(hidden_channels, out_channels * 2, 1)

    def forward(self, x, x_lengths, tone, language, zh_bert, ja_bert, en_bert, emo=None, sid=None, g=None):
        x = self.emb(x) + self.tone_emb(tone) + self.language_emb(language)

        if self.zh_bert_extra:
            zh_bert = self.bert_pre_proj(zh_bert)
        x += self.bert_proj(zh_bert).transpose(1, 2)
        x += self.ja_bert_proj(ja_bert).transpose(1, 2)
        x += self.en_bert_proj(en_bert).transpose(1, 2)

        x *= math.sqrt(self.hidden_channels)  # [b, t, h]
        if self.emotion_embedding == 1:
            # emo = emo.to(zh_bert_emb.device)
            if emo.size(-1) == 1024:
                emo_emb = self.emo_proj(emo.unsqueeze(1))
                emo_emb_ = []
                for i in range(emo_emb.size(0)):
                    temp_emo_emb, _, _ = self.emo_quantizer(
                        emo_emb[i].unsqueeze(0).to(emo.device)
                    )
                    emo_emb_.append(temp_emo_emb)
                emo_emb = torch.cat(emo_emb_, dim=0).to(emo_emb.device)
            else:
                emo_emb = (
                    self.emo_quantizer.get_output_from_indices(emo.to(torch.long))
                        .unsqueeze(0)
                        .to(emo.device)
                )

            x += self.emo_q_proj(emo_emb)
        elif self.emotion_embedding == 2:
            emo_emb = self.in_feature_net(emo)
            emo_emb, _, _ = self.emo_vq(emo_emb.unsqueeze(1))
            emo_emb = self.out_feature_net(emo_emb)
            x += emo_emb

        x *= math.sqrt(self.hidden_channels)  # [b, t, h]
        x = torch.transpose(x, 1, -1)  # [b, h, t]
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)

        x = self.encoder(x * x_mask, x_mask, g=g)
        stats = self.proj(x) * x_mask

        m, logs = torch.split(stats, self.out_channels, dim=1)
        return x, m, logs, x_mask


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):
        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 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, mask=None):
        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))

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

    def __init__(self,
                 n_vocab,
                 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=256,
                 gin_channels=256,
                 use_sdp=True,
                 n_flow_layer=4,
                 n_layers_trans_flow=6,
                 flow_share_parameter=False,
                 use_transformer_flow=True,
                 symbols=None,
                 ja_bert_dim=1024,
                 num_tones=None,
                 emotion_embedding=False,
                 zh_bert_extra=False,
                 **kwargs):

        super().__init__()
        self.n_vocab = n_vocab
        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.n_layers_trans_flow = n_layers_trans_flow
        self.use_spk_conditioned_encoder = kwargs.get("use_spk_conditioned_encoder", True)
        self.use_sdp = use_sdp
        self.use_noise_scaled_mas = kwargs.get("use_noise_scaled_mas", False)
        self.mas_noise_scale_initial = kwargs.get("mas_noise_scale_initial", 0.01)
        self.noise_scale_delta = kwargs.get("noise_scale_delta", 2e-6)
        self.current_mas_noise_scale = self.mas_noise_scale_initial
        if self.use_spk_conditioned_encoder and gin_channels > 0:
            self.enc_gin_channels = gin_channels
        self.emotion_embedding = emotion_embedding
        self.enc_p = TextEncoder(n_vocab,
                                 inter_channels,
                                 hidden_channels,
                                 filter_channels,
                                 n_heads,
                                 n_layers,
                                 kernel_size,
                                 p_dropout,
                                 self.n_speakers,
                                 gin_channels=self.enc_gin_channels,
                                 symbols=symbols,
                                 ja_bert_dim=ja_bert_dim,
                                 num_tones=num_tones,
                                 emotion_embedding=self.emotion_embedding,
                                 zh_bert_extra=zh_bert_extra,
                                 )
        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)
        if use_transformer_flow:
            self.flow = TransformerCouplingBlock(inter_channels, hidden_channels, filter_channels, n_heads,
                                                 n_layers_trans_flow, 5, p_dropout, n_flow_layer,
                                                 gin_channels=gin_channels, share_parameter=flow_share_parameter)
        else:
            self.flow = ResidualCouplingBlock(inter_channels, hidden_channels, 5, 1, n_flow_layer,
                                              gin_channels=gin_channels)
        self.sdp = StochasticDurationPredictor(hidden_channels, 192, 3, 0.5, 4, gin_channels=gin_channels)
        self.dp = DurationPredictor(hidden_channels, 256, 3, 0.5, gin_channels=gin_channels)

        if self.n_speakers > 0:
            self.emb_g = nn.Embedding(self.n_speakers, gin_channels)
        else:
            self.ref_enc = ReferenceEncoder(spec_channels, gin_channels)

    def infer(self, x, x_lengths, sid, tone, language, zh_bert, ja_bert, en_bert, noise_scale=.667, length_scale=1,
              noise_scale_w=0.8, max_len=None, sdp_ratio=0, y=None, emo=None):
        # x, m_p, logs_p, x_mask = self.enc_p(x, x_lengths, tone, language, bert)
        # g = self.gst(y)
        if self.n_speakers > 0:
            g = self.emb_g(sid).unsqueeze(-1)  # [b, h, 1]
        else:
            g = self.ref_enc(y.transpose(1, 2)).unsqueeze(-1)
        x, m_p, logs_p, x_mask = self.enc_p(x, x_lengths, tone, language, zh_bert, ja_bert, en_bert, emo, sid, g=g)
        logw = self.sdp(x, x_mask, g=g, reverse=True, noise_scale=noise_scale_w) * (sdp_ratio) + self.dp(x, x_mask,
                                                                                                             g=g) * (
                               1 - sdp_ratio)
        w = torch.exp(logw) * x_mask * length_scale
        w_ceil = torch.ceil(w)
        y_lengths = torch.clamp_min(torch.sum(w_ceil, [1, 2]), 1).long()
        y_mask = torch.unsqueeze(commons.sequence_mask(y_lengths, None), 1).to(x_mask.dtype)
        attn_mask = torch.unsqueeze(x_mask, 2) * torch.unsqueeze(y_mask, -1)
        attn = commons.generate_path(w_ceil, attn_mask)

        m_p = torch.matmul(attn.squeeze(1), m_p.transpose(1, 2)).transpose(1, 2)  # [b, t', t], [b, t, d] -> [b, d, t']
        logs_p = torch.matmul(attn.squeeze(1), logs_p.transpose(1, 2)).transpose(1,
                                                                                 2)  # [b, t', t], [b, t, d] -> [b, d, t']

        z_p = m_p + torch.randn_like(m_p) * torch.exp(logs_p) * noise_scale
        z = self.flow(z_p, y_mask, g=g, reverse=True)
        o = self.dec((z * y_mask)[:, :, :max_len], g=g)
        return o, attn, y_mask, (z, z_p, m_p, logs_p)