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import torch
import torch.nn as nn

from fastpitch.loss_function import FastPitchLoss
from tacotron2.loss_function import Tacotron2Loss
from waveglow.loss_function import WaveGlowLoss


def get_loss_function(loss_function, **kw):
    if loss_function == "Tacotron2":
        loss = Tacotron2Loss()
    elif loss_function == "WaveGlow":
        loss = WaveGlowLoss(**kw)
    elif loss_function == "FastPitch":
        loss = FastPitchLoss(**kw)
    else:
        raise NotImplementedError("unknown loss function requested: {}".format(loss_function))
    return loss.cuda()