modules/anti_aliasing/act.py

# Copyright (c) 2023 Amphion.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

import torch.nn as nn

from .resample import *

# This code is adopted from BigVGAN under the MIT License
# https://github.com/NVIDIA/BigVGAN

class Activation1d(nn.Module):
    def __init__(
        self,
        activation,
        up_ratio: int = 2,
        down_ratio: int = 2,
        up_kernel_size: int = 12,
        down_kernel_size: int = 12,
    ):
        super().__init__()
        self.up_ratio = up_ratio
        self.down_ratio = down_ratio
        self.act = activation
        self.upsample = UpSample1d(up_ratio, up_kernel_size)
        self.downsample = DownSample1d(down_ratio, down_kernel_size)

    # x: [B,C,T]
    def forward(self, x):
        x = self.upsample(x)
        x = self.act(x)
        x = self.downsample(x)

        return x