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andreasjansson/scaled_tanh.py

Created March 1, 2013 16:20
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scaled_tanh.py
def scaled_tanh(x, depth):
# scale [0, 255] to [-depth, depth]
x = x / (128.0 / depth) - depth
# apply tanh, scale now [-tanh(depth), tanh(depth)]
x = math.tanh(x)
# scale up again to [0, 255]
x = (x + math.tanh(depth)) * 128 / math.tanh(depth)
return x
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