def pool1d(x,
pool_size,
strides=1,
padding='valid',
data_format=None,
pool_mode='max'):
"""
向量序列的pool函数
"""
x = K.expand_dims(x, 1)
x = K.pool2d(x,
pool_size=(1, pool_size),
strides=(1, strides),
padding=padding,
data_format=data_format,
pool_mode=pool_mode)
return x[:, 0]
def weighted_bce_dice_loss(y_true, y_pred):
y_true = K.cast(y_true, 'float32')
y_pred = K.cast(y_pred, 'float32')
# if we want to get same size of output, kernel size must be odd number
averaged_mask = K.pool2d(y_true,
pool_size=(11, 11),
strides=(1, 1),
padding='same',
pool_mode='avg')
border = K.cast(K.greater(averaged_mask, 0.005), 'float32') * K.cast(
K.less(averaged_mask, 0.995), 'float32')
weight = K.ones_like(averaged_mask)
w0 = K.sum(weight)
weight += border * 2
w1 = K.sum(weight)
weight *= (w0 / w1)
loss = weighted_bce_loss(y_true, y_pred, weight) + \
weighted_dice_loss(y_true, y_pred, weight)
return loss
def call(self, inputs):
# Input = [X^H, X^L]
high_input, low_input = inputs if type(inputs) is list else (inputs,
None)
# High -> High conv
high_to_high = K.conv2d(high_input,
self.high_to_high_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
# High -> Low conv
high_to_low = K.pool2d(high_input, (2, 2),
strides=(2, 2),
pool_mode="avg")
high_to_low = K.conv2d(high_to_low,
self.high_to_low_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
if low_input is not None:
# Low -> High conv
low_to_high = K.conv2d(low_input,
self.low_to_high_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
low_to_high = K.repeat_elements(
low_to_high, 2, axis=1) # Nearest Neighbor Upsampling
low_to_high = K.repeat_elements(low_to_high, 2, axis=2)
# Low -> Low conv
low_to_low = K.conv2d(low_input,
self.low_to_low_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
# Cross Add
high_add = high_to_high + low_to_high
low_add = high_to_low + low_to_low
else:
high_add = high_to_high
low_add = high_to_low
return [high_add, low_add]
def call(self, inputs):
# Input=[x^H, x^L]
assert len(inputs) == 2
high_input, low_input = inputs
# High -> High conv
high_to_high = K.conv2d(high_input,
self.high_to_high_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
# High -> low conv
high_to_low = K.pool2d(high_input, (2, 2),
strides=(2, 2),
pool_mode="avg")
high_to_low = K.conv2d(high_to_low,
self.high_to_low_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
# Low -> high conv
low_to_high = K.conv2d(low_input,
self.low_to_high_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
low_to_high = K.repeat_elements(low_to_high, 2, axis=1)
low_to_high = K.repeat_elements(low_to_high, 2, axis=2)
# Low -> low conv
low_to_low = K.conv2d(low_input,
self.low_to_low_kernel,
strides=self.strides,
padding=self.padding,
data_format="channels_last")
# cross add
high_add = high_to_high + low_to_high
low_add = low_to_low + high_to_low
return [high_add, low_add]
def _get_laplacian_pyramid(self, inputs: tf.Tensor) -> List[tf.Tensor]:
""" Obtain the Laplacian Pyramid.
Parameters
----------
inputs: :class:`tf.Tensor`
The input batch of images to run through the Laplacian Pyramid
Returns
-------
list
The tensors produced from the Laplacian Pyramid
"""
pyramid = []
current = inputs
for _ in range(self._max_levels):
gauss = self._conv_gaussian(current)
diff = current - gauss
pyramid.append(diff)
current = K.pool2d(gauss, (2, 2), strides=(2, 2), padding="valid", pool_mode="avg")
pyramid.append(current)
return pyramid
def weighted_dice_loss(y_true, y_pred):
y_true = K.cast(y_true, 'float32')
y_pred = K.cast(y_pred, 'float32')
# if we want to get same size of output, kernel size must be odd number
if K.int_shape(y_pred)[1] == 128:
kernel_size = 11
elif K.int_shape(y_pred)[1] == 256:
kernel_size = 21
else:
raise ValueError('Unexpected image size')
averaged_mask = K.pool2d(y_true,
pool_size=(kernel_size, kernel_size),
strides=(1, 1),
padding='same',
pool_mode='avg')
border = K.cast(K.greater(averaged_mask, 0.005), 'float32') * K.cast(
K.less(averaged_mask, 0.995), 'float32')
weight = K.ones_like(averaged_mask)
w0 = K.sum(weight)
weight += border * 2
w1 = K.sum(weight)
weight *= (w0 / w1)
loss = 1 - weighted_dice_coeff(y_true, y_pred, weight)
return loss
def conv2d_offset_average_pool_eval(_, padding, x):
"""Perform an average pooling operation on x"""
return K.pool2d(x, (1, 1),
strides=(3, 3),
padding=padding,
pool_mode='avg')
def conv2d_offset_max_pool_eval(_, padding, x):
"""Perform a max pooling operation on x"""
return K.pool2d(x, (1, 1),
strides=(3, 3),
padding=padding,
pool_mode='max')
def _nms(heat, kernel=3):
hmax = K.pool2d(heat, (kernel, kernel), padding='same', pool_mode='max')
keep = K.cast(K.equal(hmax, heat), K.floatx())
return heat * keep