Transposed convolution layer (sometimes called Deconvolution).
Inherits From: Conv3D
, Layer
, Module
tf.keras.layers.Conv3DTranspose(
filters,
kernel_size,
strides=(1, 1, 1),
padding='valid',
output_padding=None,
data_format=None,
dilation_rate=(1, 1, 1),
activation=None,
use_bias=True,
kernel_initializer='glorot_uniform',
bias_initializer='zeros',
kernel_regularizer=None,
bias_regularizer=None,
activity_regularizer=None,
kernel_constraint=None,
bias_constraint=None,
**kwargs
)
The need for transposed convolutions generally arises
from the desire to use a transformation going in the opposite direction
of a normal convolution, i.e., from something that has the shape of the
output of some convolution to something that has the shape of its input
while maintaining a connectivity pattern that is compatible with
said convolution.
When using this layer as the first layer in a model,
provide the keyword argument input_shape
(tuple of integers or None
, does not include the sample axis),
e.g. input_shape=(128, 128, 128, 3)
for a 128x128x128 volume with 3
channels if data_format="channels_last"
.
Args |
filters
|
Integer, the dimensionality of the output space
(i.e. the number of output filters in the convolution).
|
kernel_size
|
An integer or tuple/list of 3 integers, specifying the
depth, height and width of the 3D convolution window.
Can be a single integer to specify the same value for
all spatial dimensions.
|
strides
|
An integer or tuple/list of 3 integers,
specifying the strides of the convolution along the depth, height
and width.
Can be a single integer to specify the same value for
all spatial dimensions.
Specifying any stride value != 1 is incompatible with specifying
any dilation_rate value != 1.
|
padding
|
one of "valid" or "same" (case-insensitive).
"valid" means no padding. "same" results in padding with zeros
evenly to the left/right or up/down of the input such that output has
the same height/width dimension as the input.
|
output_padding
|
An integer or tuple/list of 3 integers,
specifying the amount of padding along the depth, height, and
width.
Can be a single integer to specify the same value for all
spatial dimensions.
The amount of output padding along a given dimension must be
lower than the stride along that same dimension.
If set to None (default), the output shape is inferred.
|
data_format
|
A string,
one of channels_last (default) or channels_first .
The ordering of the dimensions in the inputs.
channels_last corresponds to inputs with shape
(batch_size, depth, height, width, channels) while channels_first
corresponds to inputs with shape
(batch_size, channels, depth, height, width) .
When unspecified, uses image_data_format value found in your Keras
config file at ~/.keras/keras.json (if exists) else 'channels_last'.
Defaults to 'channels_last'.
|
dilation_rate
|
an integer or tuple/list of 3 integers, specifying
the dilation rate to use for dilated convolution.
Can be a single integer to specify the same value for
all spatial dimensions.
Currently, specifying any dilation_rate value != 1 is
incompatible with specifying any stride value != 1.
|
activation
|
Activation function to use.
If you don't specify anything, no activation is applied
(see keras.activations ).
|
use_bias
|
Boolean, whether the layer uses a bias vector.
|
kernel_initializer
|
Initializer for the kernel weights matrix
(see keras.initializers ). Defaults to 'glorot_uniform'.
|
bias_initializer
|
Initializer for the bias vector
(see keras.initializers ). Defaults to 'zeros'.
|
kernel_regularizer
|
Regularizer function applied to
the kernel weights matrix
(see keras.regularizers ).
|
bias_regularizer
|
Regularizer function applied to the bias vector
(see keras.regularizers ).
|
activity_regularizer
|
Regularizer function applied to
the output of the layer (its "activation")
(see keras.regularizers ).
|
kernel_constraint
|
Constraint function applied to the kernel matrix
(see keras.constraints ).
|
bias_constraint
|
Constraint function applied to the bias vector
(see keras.constraints ).
|
|
5D tensor with shape:
(batch_size, channels, depth, rows, cols) if
data_format='channels_first'
or 5D tensor with shape:
(batch_size, depth, rows, cols, channels) if
data_format='channels_last'.
|
Output shape |
5D tensor with shape:
(batch_size, filters, new_depth, new_rows, new_cols) if
data_format='channels_first'
or 5D tensor with shape:
(batch_size, new_depth, new_rows, new_cols, filters) if
data_format='channels_last'.
depth and rows and cols values might have changed due to padding.
If output_padding is specified::
new_depth = ((depth - 1) * strides[0] + kernel_size[0] - 2 * padding[0] +
output_padding[0])
new_rows = ((rows - 1) * strides[1] + kernel_size[1] - 2 * padding[1] +
output_padding[1])
new_cols = ((cols - 1) * strides[2] + kernel_size[2] - 2 * padding[2] +
output_padding[2])
|
Returns |
A tensor of rank 5 representing
activation(conv3dtranspose(inputs, kernel) + bias) .
|
Raises |
ValueError
|
if padding is "causal".
|
ValueError
|
when both strides > 1 and dilation_rate > 1.
|
Methods
convolution_op
View source
convolution_op(
inputs, kernel
)