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Shivam Mehta
394
matcha/models/components/decoder.py
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394
matcha/models/components/decoder.py
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import math
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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from conformer import ConformerBlock
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from diffusers.models.attention import BasicTransformerBlock
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from diffusers.models.embeddings import TimestepEmbedding
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from einops import pack, rearrange, repeat
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class SinusoidalPosEmb(torch.nn.Module):
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def __init__(self, dim):
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super().__init__()
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self.dim = dim
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assert self.dim % 2 == 0, "SinusoidalPosEmb requires dim to be even"
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def forward(self, x, scale=1000):
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if x.ndim < 1:
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x = x.unsqueeze(0)
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device = x.device
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half_dim = self.dim // 2
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emb = math.log(10000) / (half_dim - 1)
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emb = torch.exp(torch.arange(half_dim, device=device).float() * -emb)
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emb = scale * x.unsqueeze(1) * emb.unsqueeze(0)
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emb = torch.cat((emb.sin(), emb.cos()), dim=-1)
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return emb
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class Block1D(torch.nn.Module):
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def __init__(self, dim, dim_out, groups=8):
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super().__init__()
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self.block = torch.nn.Sequential(
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torch.nn.Conv1d(dim, dim_out, 3, padding=1),
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torch.nn.GroupNorm(groups, dim_out),
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nn.Mish(),
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)
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def forward(self, x, mask):
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output = self.block(x * mask)
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return output * mask
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class ResnetBlock1D(torch.nn.Module):
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def __init__(self, dim, dim_out, time_emb_dim, groups=8):
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super().__init__()
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self.mlp = torch.nn.Sequential(nn.Mish(), torch.nn.Linear(time_emb_dim, dim_out))
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self.block1 = Block1D(dim, dim_out, groups=groups)
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self.block2 = Block1D(dim_out, dim_out, groups=groups)
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self.res_conv = torch.nn.Conv1d(dim, dim_out, 1)
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def forward(self, x, mask, time_emb):
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h = self.block1(x, mask)
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h += self.mlp(time_emb).unsqueeze(-1)
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h = self.block2(h, mask)
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output = h + self.res_conv(x * mask)
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return output
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class Downsample1D(nn.Module):
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def __init__(self, dim):
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super().__init__()
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self.conv = torch.nn.Conv1d(dim, dim, 3, 2, 1)
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def forward(self, x):
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return self.conv(x)
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class Upsample1D(nn.Module):
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"""A 1D upsampling layer with an optional convolution.
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Parameters:
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channels (`int`):
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number of channels in the inputs and outputs.
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use_conv (`bool`, default `False`):
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option to use a convolution.
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use_conv_transpose (`bool`, default `False`):
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option to use a convolution transpose.
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out_channels (`int`, optional):
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number of output channels. Defaults to `channels`.
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"""
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def __init__(self, channels, use_conv=False, use_conv_transpose=True, out_channels=None, name="conv"):
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super().__init__()
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self.channels = channels
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self.out_channels = out_channels or channels
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self.use_conv = use_conv
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self.use_conv_transpose = use_conv_transpose
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self.name = name
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self.conv = None
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if use_conv_transpose:
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self.conv = nn.ConvTranspose1d(channels, self.out_channels, 4, 2, 1)
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elif use_conv:
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self.conv = nn.Conv1d(self.channels, self.out_channels, 3, padding=1)
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def forward(self, inputs):
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assert inputs.shape[1] == self.channels
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if self.use_conv_transpose:
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return self.conv(inputs)
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outputs = F.interpolate(inputs, scale_factor=2.0, mode="nearest")
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if self.use_conv:
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outputs = self.conv(outputs)
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return outputs
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class ConformerWrapper(ConformerBlock):
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def __init__( # pylint: disable=useless-super-delegation
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self,
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*,
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dim,
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dim_head=64,
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heads=8,
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ff_mult=4,
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conv_expansion_factor=2,
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conv_kernel_size=31,
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attn_dropout=0,
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ff_dropout=0,
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conv_dropout=0,
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conv_causal=False,
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):
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super().__init__(
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dim=dim,
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dim_head=dim_head,
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heads=heads,
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ff_mult=ff_mult,
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conv_expansion_factor=conv_expansion_factor,
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conv_kernel_size=conv_kernel_size,
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attn_dropout=attn_dropout,
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ff_dropout=ff_dropout,
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conv_dropout=conv_dropout,
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conv_causal=conv_causal,
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)
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def forward(
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self,
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hidden_states,
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attention_mask,
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encoder_hidden_states=None,
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encoder_attention_mask=None,
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timestep=None,
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):
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return super().forward(x=hidden_states, mask=attention_mask.bool())
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class Decoder(nn.Module):
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def __init__(
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self,
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in_channels,
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out_channels,
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channels=(256, 256),
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dropout=0.05,
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attention_head_dim=64,
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n_blocks=1,
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num_mid_blocks=2,
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num_heads=4,
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act_fn="snake",
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down_block_type="transformer",
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mid_block_type="transformer",
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up_block_type="transformer",
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):
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super().__init__()
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channels = tuple(channels)
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self.in_channels = in_channels
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self.out_channels = out_channels
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self.time_embeddings = SinusoidalPosEmb(in_channels)
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time_embed_dim = channels[0] * 4
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self.time_mlp = TimestepEmbedding(
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in_channels=in_channels,
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time_embed_dim=time_embed_dim,
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act_fn="silu",
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)
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self.down_blocks = nn.ModuleList([])
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self.mid_blocks = nn.ModuleList([])
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self.up_blocks = nn.ModuleList([])
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output_channel = in_channels
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for i in range(len(channels)): # pylint: disable=consider-using-enumerate
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input_channel = output_channel
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output_channel = channels[i]
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is_last = i == len(channels) - 1
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resnet = ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
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transformer_blocks = nn.ModuleList(
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[
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self.get_block(
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down_block_type,
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output_channel,
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attention_head_dim,
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num_heads,
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dropout,
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act_fn,
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)
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for _ in range(n_blocks)
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]
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)
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downsample = (
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Downsample1D(output_channel) if not is_last else nn.Conv1d(output_channel, output_channel, 3, padding=1)
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)
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self.down_blocks.append(nn.ModuleList([resnet, transformer_blocks, downsample]))
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for i in range(num_mid_blocks):
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input_channel = channels[-1]
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out_channels = channels[-1]
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resnet = ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
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transformer_blocks = nn.ModuleList(
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[
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self.get_block(
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mid_block_type,
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output_channel,
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attention_head_dim,
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num_heads,
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dropout,
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act_fn,
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)
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for _ in range(n_blocks)
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]
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)
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self.mid_blocks.append(nn.ModuleList([resnet, transformer_blocks]))
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channels = channels[::-1] + (channels[0],)
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for i in range(len(channels) - 1):
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input_channel = channels[i]
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output_channel = channels[i + 1]
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is_last = i == len(channels) - 2
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resnet = ResnetBlock1D(
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dim=2 * input_channel,
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dim_out=output_channel,
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time_emb_dim=time_embed_dim,
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)
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transformer_blocks = nn.ModuleList(
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[
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self.get_block(
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up_block_type,
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output_channel,
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attention_head_dim,
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num_heads,
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dropout,
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act_fn,
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)
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for _ in range(n_blocks)
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]
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)
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upsample = (
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Upsample1D(output_channel, use_conv_transpose=True)
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if not is_last
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else nn.Conv1d(output_channel, output_channel, 3, padding=1)
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)
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self.up_blocks.append(nn.ModuleList([resnet, transformer_blocks, upsample]))
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self.final_block = Block1D(channels[-1], channels[-1])
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self.final_proj = nn.Conv1d(channels[-1], self.out_channels, 1)
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self.initialize_weights()
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# nn.init.normal_(self.final_proj.weight)
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@staticmethod
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def get_block(block_type, dim, attention_head_dim, num_heads, dropout, act_fn):
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if block_type == "conformer":
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block = ConformerWrapper(
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dim=dim,
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dim_head=attention_head_dim,
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heads=num_heads,
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ff_mult=1,
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conv_expansion_factor=2,
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ff_dropout=dropout,
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attn_dropout=dropout,
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conv_dropout=dropout,
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conv_kernel_size=31,
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)
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elif block_type == "transformer":
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block = BasicTransformerBlock(
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dim=dim,
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num_attention_heads=num_heads,
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attention_head_dim=attention_head_dim,
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dropout=dropout,
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activation_fn=act_fn,
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)
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else:
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raise ValueError(f"Unknown block type {block_type}")
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return block
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def initialize_weights(self):
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for m in self.modules():
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if isinstance(m, nn.Conv1d):
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nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
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if m.bias is not None:
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nn.init.constant_(m.bias, 0)
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elif isinstance(m, nn.GroupNorm):
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nn.init.constant_(m.weight, 1)
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nn.init.constant_(m.bias, 0)
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elif isinstance(m, nn.Linear):
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nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
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if m.bias is not None:
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nn.init.constant_(m.bias, 0)
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def forward(self, x, mask, mu, t, spks=None, cond=None):
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"""Forward pass of the UNet1DConditional model.
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Args:
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x (torch.Tensor): shape (batch_size, in_channels, time)
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mask (_type_): shape (batch_size, 1, time)
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t (_type_): shape (batch_size)
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spks (_type_, optional): shape: (batch_size, condition_channels). Defaults to None.
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cond (_type_, optional): placeholder for future use. Defaults to None.
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Raises:
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ValueError: _description_
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ValueError: _description_
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Returns:
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_type_: _description_
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"""
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t = self.time_embeddings(t)
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t = self.time_mlp(t)
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x = pack([x, mu], "b * t")[0]
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if spks is not None:
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spks = repeat(spks, "b c -> b c t", t=x.shape[-1])
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x = pack([x, spks], "b * t")[0]
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hiddens = []
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masks = [mask]
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for resnet, transformer_blocks, downsample in self.down_blocks:
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mask_down = masks[-1]
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x = resnet(x, mask_down, t)
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x = rearrange(x, "b c t -> b t c")
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mask_down = rearrange(mask_down, "b 1 t -> b t")
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for transformer_block in transformer_blocks:
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x = transformer_block(
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hidden_states=x,
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attention_mask=mask_down,
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timestep=t,
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)
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x = rearrange(x, "b t c -> b c t")
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mask_down = rearrange(mask_down, "b t -> b 1 t")
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hiddens.append(x) # Save hidden states for skip connections
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x = downsample(x * mask_down)
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masks.append(mask_down[:, :, ::2])
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masks = masks[:-1]
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mask_mid = masks[-1]
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for resnet, transformer_blocks in self.mid_blocks:
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x = resnet(x, mask_mid, t)
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x = rearrange(x, "b c t -> b t c")
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mask_mid = rearrange(mask_mid, "b 1 t -> b t")
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for transformer_block in transformer_blocks:
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x = transformer_block(
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hidden_states=x,
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attention_mask=mask_mid,
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timestep=t,
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)
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x = rearrange(x, "b t c -> b c t")
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mask_mid = rearrange(mask_mid, "b t -> b 1 t")
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for resnet, transformer_blocks, upsample in self.up_blocks:
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mask_up = masks.pop()
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x = resnet(pack([x, hiddens.pop()], "b * t")[0], mask_up, t)
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x = rearrange(x, "b c t -> b t c")
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mask_up = rearrange(mask_up, "b 1 t -> b t")
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for transformer_block in transformer_blocks:
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x = transformer_block(
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hidden_states=x,
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attention_mask=mask_up,
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timestep=t,
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)
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x = rearrange(x, "b t c -> b c t")
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mask_up = rearrange(mask_up, "b t -> b 1 t")
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x = upsample(x * mask_up)
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x = self.final_block(x, mask_up)
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output = self.final_proj(x * mask_up)
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return output * mask
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