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proper nnlib.dssim

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iperov 2019-02-20 19:03:49 +04:00
parent cd4e5b9ba6
commit d66829aae4
1 changed files with 28 additions and 39 deletions
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67
nnlib/nnlib.py
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@ -268,60 +268,49 @@ NLayerDiscriminator = nnlib.NLayerDiscriminator
return func
nnlib.style_loss = style_loss
def dssim(k1=0.01, k2=0.03, max_value=1.0):
# port of tf.image.ssim to pure keras in order to work on plaidML backend.
def func(y_true, y_pred):
ch = K.int_shape(y_pred)[-1]
def softmax(x, axis=-1): #from K numpy backend
y = np.exp(x - np.max(x, axis, keepdims=True))
return y / np.sum(y, axis, keepdims=True)
def gauss_kernel(size, sigma):
coords = np.arange(0,size, dtype=K.floatx() )
ch = K.shape(y_pred)[-1]
def _fspecial_gauss(size, sigma):
#Function to mimic the 'fspecial' gaussian MATLAB function.
coords = np.arange(0, size, dtype=K.floatx())
coords -= (size - 1 ) / 2.0
g = coords**2
g *= ( -0.5 / (sigma**2) )
g = np.reshape (g, (1,-1)) + np.reshape(g, (-1,1) )
g = np.reshape (g, (1,-1))
g = softmax(g)
g = np.reshape (g, (size, size, 1, 1))
g = np.tile (g, (1,1,ch,1))
return K.constant(g, dtype=K.floatx() )
kernel = gauss_kernel(11,1.5)
g = K.constant ( np.reshape (g, (1,-1)) )
g = K.softmax(g)
g = K.reshape (g, (size, size, 1, 1))
g = K.tile (g, (1,1,ch,1))
return g
kernel = _fspecial_gauss(11,1.5)
def reducer(x):
shape = K.shape(x)
x = K.reshape(x, (-1, shape[-3] , shape[-2], shape[-1]) )
y = K.depthwise_conv2d(x, kernel, strides=(1, 1), padding='valid')
y_shape = K.shape(y)
return K.reshape(y, (shape[0], y_shape[1], y_shape[2], y_shape[3] ) )
return K.depthwise_conv2d(x, kernel, strides=(1, 1), padding='valid')
def _ssim_helper(x, y, reducer, compensation=1.0):
c1 = (k1 * max_value) ** 2
c2 = (k2 * max_value) ** 2
mean0 = reducer(x)
mean1 = reducer(y)
num0 = mean0 * mean1 * 2.0
den0 = K.square(mean0) + K.square(mean1)
luminance = (num0 + c1) / (den0 + c1)
num1 = reducer(x * y) * 2.0
den1 = reducer(K.square(x) + K.square(y))
c2 *= compensation
cs = (num1 - num0 + c2) / (den1 - den0 + c2)
return luminance, cs
c1 = (k1 * max_value) ** 2
c2 = (k2 * max_value) ** 2
mean0 = reducer(y_true)
mean1 = reducer(y_pred)
num0 = mean0 * mean1 * 2.0
den0 = K.square(mean0) + K.square(mean1)
luminance = (num0 + c1) / (den0 + c1)
num1 = reducer(y_true * y_pred) * 2.0
den1 = reducer(K.square(y_true) + K.square(y_pred))
c2 *= 1.0 #compensation factor
cs = (num1 - num0 + c2) / (den1 - den0 + c2)
luminance, cs = _ssim_helper(y_true, y_pred, reducer)
ssim_val = K.mean(luminance * cs, axis=(-3, -2) )
return K.mean( (1.0 - ssim_val ) / 2.0 )
return func
nnlib.dssim = dssim
class PixelShuffler(keras.layers.Layer):