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"""

Script provides functional interface for Mish activation function.

"""

# import pytorch
import torch
import torch.nn.functional as F


@torch.jit.script
def mish(input):
    """

    Applies the mish function element-wise:

    mish(x) = x * tanh(softplus(x)) = x * tanh(ln(1 + exp(x)))

    See additional documentation for mish class.

    """
    return input * torch.tanh(F.softplus(input))