from chainer import cuda
from chainer import function
from chainer import utils
from chainer.utils import type_check
class Cosh(function.Function):
@property
def label(self):
return 'cosh'
def check_type_forward(self, in_types):
type_check.expect(
in_types.size() == 1,
in_types[0].dtype.kind == 'f',
)
def forward(self, x):
xp = cuda.get_array_module(*x)
return utils.force_array(xp.cosh(x[0])),
def backward(self, x, gy):
xp = cuda.get_array_module(*x)
gx = utils.force_array(xp.sinh(x[0]))
gx *= gy[0]
return gx,
[docs]def cosh(x):
"""Elementwise hyperbolic cosine function.
.. math::
y_i = \\cosh x_i.
Args:
x (~chainer.Variable): Input variable.
Returns:
~chainer.Variable: Output variable.
"""
return Cosh()(x)
class Sinh(function.Function):
@property
def label(self):
return 'sinh'
def check_type_forward(self, in_types):
type_check.expect(
in_types.size() == 1,
in_types[0].dtype.kind == 'f',
)
def forward(self, x):
xp = cuda.get_array_module(*x)
return utils.force_array(xp.sinh(x[0])),
def backward(self, x, gy):
xp = cuda.get_array_module(*x)
gx = utils.force_array(xp.cosh(x[0]))
gx *= gy[0]
return gx,
[docs]def sinh(x):
"""Elementwise hyperbolic sine function.
.. math::
y_i = \\sinh x_i.
Args:
x (~chainer.Variable): Input variable.
Returns:
~chainer.Variable: Output variable.
"""
return Sinh()(x)