def tanh():
one_rd = crlibm.log_rd(crlibm.exp_rd(1))
def tanh_rd(x):
if x < 0:
return -tanh_ru(-x)
if x == fpu.infinity:
return 1.0
s, c = crlibm.sinh_rd(x), crlibm.cosh_ru(x)
if fpu.infinity in (s, c):
return one_rd
return fpu.down(lambda: s / c)
def tanh_ru(x):
if x < 0:
return -tanh_rd(-x)
if x == fpu.infinity:
return 1.0
s, c = crlibm.sinh_ru(x), crlibm.cosh_rd(x)
if fpu.infinity in (s, c):
return 1.0
return fpu.up(lambda: s / c)
@monotonic(rd=tanh_rd, ru=tanh_ru)
def tanh(c):
"Hyberbolic tangent."
return tanh
def tanh():
one_rd = crlibm.log_rd(crlibm.exp_rd(1))
def tanh_rd(x):
if x < 0:
return -tanh_ru(-x)
if x == fpu.infinity:
return 1.0
s, c = crlibm.sinh_rd(x), crlibm.cosh_ru(x)
if fpu.infinity in (s, c):
return one_rd
return fpu.down(lambda: s/c)
def tanh_ru(x):
if x < 0:
return -tanh_rd(-x)
if x == fpu.infinity:
return 1.0
s, c = crlibm.sinh_ru(x), crlibm.cosh_rd(x)
if fpu.infinity in (s, c):
return 1.0
return fpu.up(lambda: s/c)
@monotonic(rd=tanh_rd, ru=tanh_ru)
def tanh(c):
"Hyberbolic tangent."
return tanh