def cosh(x: Array, /) -> Array:
"""
Array API compatible wrapper for :py:func:`np.cosh <numpy.cosh>`.
See its docstring for more information.
"""
if x.dtype not in _floating_dtypes:
raise TypeError("Only floating-point dtypes are allowed in cosh")
return Array._new(np.cosh(x._array))
def backward(self):
vector, out = self.get_ctx('vector', 'out')
if out.grad is not None:
vector_grad = xp.multiply(xp.cosh(vector.data)**(-2), out.grad)
vector.accumulate_grad(vector_grad)
def dtanh(z):
# print("Tanh derivative: " + str(z))
return cp.power(cp.cosh(z), 2)
def sech__(z):
return 1.0/cp.cosh(z)
def dGohc(self, uc, vc, beta):
return vc/cp.cosh(uc)**2
def cosh(x):
return cp.cosh(x)