def tile(router, R):
# Sum the relevances received from upper layers
R = lrp_util.sum_relevances(R)
# Get the current operation, i.e. the tile operation we are currently handling
current_operation = router.get_current_operation()
# Get the input to the tiling operation and find the shape of it
input_to_current_operation = current_operation.inputs[0]
input_shape = tf.shape(input_to_current_operation)
# Get the size of the 'predictions_per_sample' dimension from R
R_shape = tf.shape(R)
predictions_per_sample = R_shape[1]
# Reshape to a list so it can be used in the concat below
predictions_per_sample = tf.reshape(predictions_per_sample, (1, ))
# Get the tensor that tells how many times the input has been duplicated for each dimension of the input
copies_per_dimension = current_operation.inputs[1]
# Get the number of dimensions of the input
rank_input = tf.size(copies_per_dimension)
# Transpose R from shape (batch_size, predictions_per_sample, ....) to shape
# (predictions_per_sample, batch_size, ...) since the predictions_per_sample dimensions is left untouched in
# the processing below
remaining_axes = tf.range(2, rank_input + 1)
perm = tf.concat([[1, 0], remaining_axes], 0)
R = tf.transpose(R, perm)
# Reshape R to shape (copies_dim_0, input_size_dim_0, ... copies_dim_(r-1), input_size_dim(r-1))
double_rank = rank_input * 2
zipped_dims = tf.reshape(tf.transpose([copies_per_dimension, input_shape]),
(double_rank, ))
zipped_dims = tf.concat([predictions_per_sample, zipped_dims], 0)
R = tf.reshape(R, zipped_dims)
# Transpose R to shape (input_size_dim_0, copies_dim_0 ... input_size_dim(r-1), copies_dim_(r-1))
perm1 = tf.range(2, double_rank + 1, 2)
perm2 = tf.range(1, double_rank + 1, 2)
zipped_perm = tf.reshape(tf.transpose([perm1, perm2]), (double_rank, ))
zipped_perm = tf.concat([[0], zipped_perm], 0)
R = tf.transpose(R, zipped_perm)
# Reduce sum for R over dimensions 'input_size_dim_0', ... 'input_size_dim(r-1)'
R_new = tf.reduce_sum(R, perm1)
# Transpose R back from shape (predictions_per_sample, batch_size ....) to shape
# (batch_size, predictions_per_sample, ...)
remaining_axes = tf.range(2, rank_input + 1)
perm = tf.concat([[1, 0], remaining_axes], 0)
R_new = tf.transpose(R_new, perm)
# Mark the tiling operation as handled
router.mark_operation_handled(current_operation)
# Forward the relevance to input to the tile operation
router.forward_relevance_to_operation(R_new, current_operation,
input_to_current_operation.op)
def sparse_reorder(router, R):
"""
Handeling softmax layers by passing the relevance along to the input
:param router: the router object to report changes to
:param R: the list of tensors containing the relevances from the upper layers
"""
# Sum the potentially multiple relevances from the upper layers
R = lrp_util.sum_relevances(R)
# Get the current operation
current_operation = router.get_current_operation()
# Report handled operations
router.mark_operation_handled(current_operation)
# Forward the calculated relevance to the input of the convolution
for input in current_operation.inputs:
router.forward_relevance_to_operation(R, current_operation, input.op)
def forward(router, R):
"""
Handeling all nonlinearities (Relu, Sigmoid, Tanh) by passing the relevance along
:param router: the router object to report changes to
:param R: the list of tensors containing the relevances from the upper layers
"""
# Sum the potentially multiple relevances from the upper layers
R = lrp_util.sum_relevances(R)
# Get the current operation
current_operation = router.get_current_operation()
# Report handled operations
router.mark_operation_handled(current_operation)
# Forward the calculated relevance to the input of the convolution
router.forward_relevance_to_operation(R, current_operation,
current_operation.inputs[0].op)
def slicing(router, R):
# Sum the relevances
R = lrp_util.sum_relevances(R)
# Get the current operation
current_operation = router.get_current_operation()
# Get the input to the slicing operation
input_to_slicing_operation = current_operation.inputs[0]
# Cut off the batch size and maybe predictions pr. sample if exists from the tensor shapes
# since we never want to pad the batch dimension
free_dimensions = 2 - (tf.rank(R) - tf.rank(input_to_slicing_operation))
def _relevant_dims(tensor):
return tensor[free_dimensions:]
# Get the shape of the input to the slicing operation
input_shape = _relevant_dims(tf.shape(input_to_slicing_operation))
# Find starting point of the slice operation
starting_point = _relevant_dims(current_operation.inputs[1])
# Find size of the slice operation
size_of_slice = _relevant_dims(current_operation.inputs[2])
# Find the number of zeros to insert after the relevances
end_zeros = input_shape - (starting_point + size_of_slice)
# For each axis, insert 'starting_point' zeros before the relevances and
# 'size_of_split'-('starting_point' + 'size_of_split') zeros after the relevances
padding = tf.transpose(tf.stack([starting_point, end_zeros]))
# Never use any padding for the first two dimensions, since these are always batch_size, predictions_per_sample
# and should stay constant all the way through the framework
batch_and_sample_padding = tf.zeros((2, 2), dtype=tf.int32)
padding = tf.concat([batch_and_sample_padding, padding], axis=0)
R_new = tf.pad(R, padding)
# Mark operations as handled
router.mark_operation_handled(current_operation)
# Forward the calculated relevances
router.forward_relevance_to_operation(R_new, current_operation, input_to_slicing_operation.op)
def handle_context(self, context):
path_ = context[CONTEXT_PATH]
# Get the relevances to move through the LSTM
R = self.router.get_relevance_for_operation(path_[0])
# Sum the potentially multiple relevances from the upper layers
R = lrp_util.sum_relevances(R)
# Get the path containing all operations in the LSTM
path = context[CONTEXT_PATH]
# Get the extra information related to the LSTM context
extra_context_information = context[EXTRA_CONTEXT_INFORMATION]
# Get the transpose operation that marks the beginning of the LSTM
transpose_operation = extra_context_information[
LSTM_BEGIN_TRANSPOSE_OPERATION]
# Get the operation that produces the input to the LSTM (i.e. the operation right before
# the transpose that marks the start of the LSTM)
input_operation = extra_context_information[LSTM_INPUT_OPERATION]
# Get the tensor that is the input to the LSTM (i.e. the input to the transpose operation
# that marks the start of the LSTM)
LSTM_input = transpose_operation.inputs[0]
# TODO use configuration to set alpha_beta or epsilon rule
# Calculate the relevances to distribute to the lower layers
lstm_config = self.get_configuration(LAYER.LSTM)
R_new = lstm(lstm_config, path, R, LSTM_input)
# TODO this call should be done in the LSTM. Not in the context handler.
# Mark all operations belonging to the LSTM as "handled"
for op in path:
self.router.mark_operation_handled(op)
# TODO this call should be done in the LSTM. Not in the context handler.
# Forward the relevances to the lower layers
self.router.forward_relevance_to_operation(R_new, transpose_operation,
input_operation)
def sparse_reshape(router, R):
# Sum the potentially multiple relevances from the upper layers
R = lrp_util.sum_relevances(R)
# Get the current operation (i.e. the sparse reshape operation we are currently taking care of)
current_operation = router.get_current_operation()
# Get the shape of the input to the sparse reshape operation
input_shape = current_operation.inputs[1]
# Split the shape of the input into 'batch_size' and everything else
batch_size, input_shape_without_batch_size = tf.split(
input_shape, [1, -1], 0)
# Get the shape of the relevances
relevances_shape = tf.shape(R)
# Find the size of the predictions_per_sample dimension
predictions_per_sample = relevances_shape[1]
# Cast 'predictions_per_sample' to int64 to be able to concatenate with the dimensions from the sparse
# tensor which are int64
predictions_per_sample = tf.cast(predictions_per_sample, tf.int64)
# Concatenate the dimensions to get the new shape of the relevances
relevances_new_shape = tf.concat(
[batch_size, [predictions_per_sample], input_shape_without_batch_size],
0)
# Reshape R to the same shape as the input to the reshaping operation
R_reshaped = tf.sparse_reshape(R, relevances_new_shape)
# Tell the router that we handled this operation
router.mark_operation_handled(current_operation)
# Forward relevance to the operation of the input to the current operation
for input in current_operation.inputs:
router.forward_relevance_to_operation(R_reshaped, current_operation,
input.op)
def shaping(router, R):
# Sum the potentially multiple relevances from the upper layers
R = lrp_util.sum_relevances(R)
# Get the current operation (i.e. the shaping operation we are currently taking care of)
current_operation = router.get_current_operation()
# Get the input to the shaping operation
input_to_current_operation = current_operation.inputs[0]
# Get the shape of the input to the shaping operation
input_shape = tf.shape(input_to_current_operation)
# Split the shape of the input into 'batch_size' and everything else
batch_size, input_shape_without_batch_size = tf.split(
input_shape, [1, -1], 0)
# Get the shape of the relevances
relevances_shape = tf.shape(R)
# Find the size of the predictions_per_sample dimension
predictions_per_sample = relevances_shape[1]
# Concatenate the dimensions to get the new shape of the relevances
relevances_new_shape = tf.concat(
[batch_size, [predictions_per_sample], input_shape_without_batch_size],
0)
# Reshape R to the same shape as the input to the reshaping operation that created the tensor
# but leave the two first dimensions untouched since they are batch_size, predictions_per_sample
# which stay constant all the way through the framework
R_reshaped = tf.reshape(R, relevances_new_shape)
# Tell the router that we handled this operation
router.mark_operation_handled(current_operation)
# Forward relevance to the operation of the input to the current operation
router.forward_relevance_to_operation(R_reshaped, current_operation,
input_to_current_operation.op)
def _lrp_routing(self):
# Create context handler switch which is used to forward the responsibility of the
# different types of contexts to the appropriate handlers
context_switch = ContextHandlerSwitch(self)
# Handle each context separately by routing the context through the context switch
for idx, current_context in enumerate(self.contexts):
self.final_context = len(self.contexts) == idx + 1
context_switch.handle_context(current_context)
# Sum the potentially multiple relevances calculated for the input
final_input_relevances = lrp_util.sum_relevances(
self.relevances[self._input.op._id])
# If the starting point relevances were shape (batch_size, classes), remove the extra
# predictions_per_sample dimension that was added to the starting point relevances
if not self.starting_point_relevances_had_predictions_per_sample_dimension:
# Check if the relevances are sparse, in which case we need to use tf's sparse reshape operation
# to remove the extra dimension
if isinstance(final_input_relevances, tf.SparseTensor):
# Get the shape of the final relevances
final_input_relevances_shape = tf.shape(final_input_relevances)
# Extract the batch_size dimension
batch_size = tf.slice(final_input_relevances_shape, [0], [1])
# Extract all the dimensions after the predictions_per_sample dimension
sample_dimensions = tf.slice(final_input_relevances_shape, [2],
[-1])
# Create the new shape of the relevances, i.e. the shape where the predictions_per_sample
# has been removed
final_input_relevances_new_shape = tf.concat(
[batch_size, sample_dimensions], 0)
# Remove the predictions_per_sample dimension
final_input_relevances = tf.sparse_reshape(
final_input_relevances, final_input_relevances_new_shape)
# If the relevances are not sparse, i.e. they are dense, we can just squeeze the extra dimension
else:
final_input_relevances = tf.squeeze(final_input_relevances, 1)
return final_input_relevances
def concatenate(router, R):
# Sum the potentially multiple relevances from the upper layers
# Shape: (batch_size, ...)
R = lrp_util.sum_relevances(R)
# Get the current concatenate operation
current_operation = router.get_current_operation()
# Find axis that the concatenation was over
axis = current_operation.inputs[-1]
# Split relevances in same order. Start by initializing empty arrays to hold respectively the sizes that the
# relevances shall be split in and the receivers of the relevances
split_sizes = []
input_operations = []
# Run through the inputs to the current operation except the last (the last input is the "axis" input)
for inp in current_operation.inputs[:-1]:
# Add the operation to the array
input_operations.append(inp.op)
# Find the shape of the operation
shape = tf.shape(inp)
# Find and add the size of the input in the "axis" dimension
split_sizes.append(shape[axis])
# Adjust the axis to split over, since we in the lrp router have one extra dimension for
# predictions_per_sample
axis += 1
# Split the relevances over the "axis" dimension according to the found split sizes
R_splitted = tf.split(R, split_sizes, axis)
# Tell the router that we handled the concatenate operation
router.mark_operation_handled(current_operation)
# Forward relevance to the operation of the input to the concatenate operation
for input_index, relevance in enumerate(R_splitted):
router.forward_relevance_to_operation(relevance, current_operation,
input_operations[input_index])
def convolutional(router, R):
"""
Convolutional lrp
:param router: the router object to report changes to
:param R: the list of tensors containing the relevances from the upper layers
"""
# Sum the potentially multiple relevances from the upper layers
# Shape of R: (batch_size, predictions_per_sample, out_height, out_width, out_depth)
R = lrp_util.sum_relevances(R)
# Start by assuming the activation tensor is the output
# of a convolution (i.e. not an addition with a bias)
# Shape of current_tensor and convolution_tensor: (batch_size, out_height, out_width, out_depth)
current_operation = router.get_current_operation()
current_tensor = convolution_tensor = current_operation.outputs[0]
# Remember that there was no bias
with_bias = False
bias_tensor = None
# If the top operation is an addition (i.e. the above assumption
# does not hold), move through the graph to find the output of the nearest convolution
if current_operation.type in ['BiasAdd', 'Add']:
# Shape of convolution_tensor: (batch_size, out_height, out_width, out_depth)
convolution_tensor = lrp_util.find_first_tensor_from_type(
current_tensor, 'Conv2D')
bias_tensor = lrp_util.get_input_bias_from_add(current_tensor)
with_bias = True
# Find the inputs to the convolution
(conv_input, filters) = convolution_tensor.op.inputs
# Find the padding and strides that were used in the convolution
padding = convolution_tensor.op.get_attr("padding").decode("UTF-8")
strides = convolution_tensor.op.get_attr("strides")
# Extract dimensions of the filters
filter_sh = filters.get_shape().as_list()
filter_height = filter_sh[0]
filter_width = filter_sh[1]
# Get shape of the input
input_shape = tf.shape(conv_input)
batch_size = input_shape[0]
input_height = input_shape[1]
input_width = input_shape[2]
input_channels = input_shape[3]
# Get the shape of the output of the convolution
convolution_tensor_shape = tf.shape(convolution_tensor)
output_height = convolution_tensor_shape[1]
output_width = convolution_tensor_shape[2]
output_channels = convolution_tensor_shape[3]
# Extract every patch of the input (i.e. portion of the input that a filter looks at a
# time), to get a tensor of shape
# (batch_size, out_height, out_width, filter_height*filter_width*input_channels)
image_patches = tf.extract_image_patches(
conv_input, [1, filter_height, filter_width, 1], strides, [1, 1, 1, 1],
padding)
# Reshape patches to suit linear
# shape: (batch_size * out_height * out_width, filter_height * filter_width * input_channels)
linear_input = tf.reshape(image_patches,
(batch_size * output_height * output_width,
filter_height * filter_width * input_channels))
# Reshape finters to suit linear
linear_filters = tf.reshape(filters, (-1, output_channels))
# Transpose relevances to suit linear
# Shape goes from (batch_size, predictions_per_sample, out_height, out_width, out_channels)
# to: (batch_size, out_height, out_width, predictions_per_sample, out_channels)
R_shape = tf.shape(R)
# Find the number of predictions per sample from R
predictions_per_sample = R_shape[1]
# Make transpose order (0, 2, .. , 1, last_dim)
# This in necessary because for conv1d the output might have been expanded which
# makes the output size partially unknown
transpose_order = tf.concat(
[[0],
tf.range(2,
tf.size(R_shape) - 1), [1], [tf.size(R_shape) - 1]], 0)
# Do the actual transpose
linear_R = tf.transpose(R, transpose_order)
# Reshape linear_R to have three dimensions
linear_R = tf.reshape(linear_R, (batch_size * output_height * output_width,
predictions_per_sample, output_channels))
# Fetch configuration for linear_lrp
config = router.get_configuration(LAYER.CONVOLUTIONAL)
if config.type == RULE.ZB:
# Reshape to convolution shape
low = tf.reshape(config.low,
[1, input_height, input_width, input_channels])
high = tf.reshape(config.high,
[1, input_height, input_width, input_channels])
# Tile to batch size
# Shapes: (batch_size, input_height, input_width, input_channels)
low = tf.tile(low, [batch_size, 1, 1, 1])
high = tf.tile(high, [batch_size, 1, 1, 1])
# Extract image patches
# Shapes: (batch_size, output_height, output_width, filter_height * filter_width * input_channels)
low = tf.extract_image_patches(low,
[1, filter_height, filter_width, 1],
strides, [1, 1, 1, 1], padding)
high = tf.extract_image_patches(high,
[1, filter_height, filter_width, 1],
strides, [1, 1, 1, 1], padding)
# Reshape image patches for linear layer
config.low = tf.reshape(
low, (batch_size * output_height * output_width,
filter_height * filter_width * input_channels, 1))
config.high = tf.reshape(
high, (batch_size * output_height * output_width,
filter_height * filter_width * input_channels, 1))
# Pass the responsibility to linear_lrp
# Shape of linear_R_new:
# (batch_size * out_height * out_width, predictions_per_sample, filter_height * filter_width * input_channels)
linear_R_new = linear_with_config(linear_R,
linear_input,
linear_filters,
config,
bias=bias_tensor)
# Shape back to be able to restitch
linear_R_new = tf.reshape(
linear_R_new,
(batch_size, output_height, output_width, predictions_per_sample,
filter_height * filter_width * input_channels))
# Transpose back to be able to restitch
# New shape:
# (batch_size, predictions_per_sample, out_height, out_width, filter_height * filter_width * input_channels)
linear_R_new = tf.transpose(linear_R_new, [0, 3, 1, 2, 4])
# Gather batch_size and predictions_per_sample
# New shape:
# (batch_size * predictions_per_sample, out_height, out_width, filter_height * filter_width * input_channels)
linear_R_new = tf.reshape(
linear_R_new,
(batch_size * predictions_per_sample, output_height, output_width,
filter_height * filter_width * input_channels))
# Restitch relevances to the input size
R_new = lrp_util.patches_to_images(
linear_R_new, batch_size * predictions_per_sample, input_height,
input_width, input_channels, output_height, output_width,
filter_height, filter_width, strides[1], strides[2], padding)
# Reshape the calculated relevances from
# (batch_size * predictions_per_sample, input_height, input_width, input_channels) to new shape:
# (batch_size, predictions_per_sample, input_height, input_width, input_channels)
R_new = tf.reshape(R_new, (batch_size, predictions_per_sample,
input_height, input_width, input_channels))
# Report handled operations
router.mark_operation_handled(current_tensor.op)
router.mark_operation_handled(convolution_tensor.op)
# In case of 1D convolution we need to skip the squeeze operation in
# the path towards the input
if with_bias and current_tensor.op.inputs[0].op.type == 'Squeeze':
router.mark_operation_handled(current_tensor.op.inputs[0].op)
# Forward the calculated relevance to the input of the convolution
router.forward_relevance_to_operation(R_new, convolution_tensor.op,
conv_input.op)
def max_pooling(router, R):
"""
Max pooling lrp
:param router: the router object to report changes to
:param R: the list of tensors containing the relevances from the upper layers
"""
# Sum the potentially multiple relevances from the upper layers
# Shape of R: (batch_size, predictions_per_sample, out_height, out_width, out_depth)
R = lrp_util.sum_relevances(R)
# Get current operation from the router
current_operation = router.get_current_operation()
# Get the output from the max pool operation
# Shape of current_tensor: (batch_size, out_height, out_width, out_depth)
current_tensor = current_operation.outputs[0]
# Find the input to the max pooling
# Shape of current_tensor: (batch_size, in_height, in_width, in_depth)
max_pool_input = current_operation.inputs[0]
# Find the padding and strides that were used in the max pooling
padding = current_operation.get_attr("padding").decode("UTF-8")
strides = current_operation.get_attr("strides")
kernel_size = current_operation.get_attr("ksize")
# Get shape of the input
max_pooling_input_shape = tf.shape(max_pool_input)
batch_size = max_pooling_input_shape[0]
input_height = max_pooling_input_shape[1]
input_width = max_pooling_input_shape[2]
input_channels = max_pooling_input_shape[3]
# (batch_size, input_height, input_width, input_channels) = max_pool_input.get_shape().as_list()
# Get the shape of the output of the max pool operation
current_tensor_shape = tf.shape(current_tensor)
output_height = current_tensor_shape[1]
output_width = current_tensor_shape[2]
output_channels = current_tensor_shape[3]
# Extract information about R for later reshapes
R_shape = tf.shape(R)
predictions_per_sample = R_shape[1]
batch_size_times_predictions_per_sample = batch_size * predictions_per_sample
# (_, output_height, output_width, output_channels) = current_tensor.get_shape().as_list()
# Extract every patch of the input (i.e. portion of the input that the kernel looks at a time)
# Shape of image_patches: (batch, out_height, out_width, kernel_height*kernel_width*input_channels)
image_patches = tf.extract_image_patches(max_pool_input, kernel_size,
strides, [1, 1, 1, 1], padding)
# Reshape image patches to "small images" instead of lists
# Shape of image_patches after reshape:
# (batch_size, out_height, out_width, kernel_height, kernel_width, input_channels)
image_patches_reshaped = tf.reshape(image_patches, [
batch_size, output_height, output_width, kernel_size[1],
kernel_size[2], input_channels
])
def _winner_takes_all():
image_patches_transposed = tf.transpose(image_patches_reshaped,
[0, 1, 2, 5, 3, 4])
image_patches_rt = tf.reshape(
image_patches_transposed,
(batch_size, output_height, output_width, input_channels, -1))
image_patches_argmax = tf.argmax(image_patches_rt, axis=-1)
# Shape (batch_size, out_height, out_width, input_channels, kernel_height * kernel_width)
image_patches_one_hot = tf.one_hot(image_patches_argmax,
kernel_size[1] * kernel_size[2])
one_hot_transposed = tf.transpose(image_patches_one_hot,
[0, 1, 2, 4, 3])
one_hot_reshaped = tf.reshape(
one_hot_transposed,
(batch_size, output_height, output_width, kernel_size[1],
kernel_size[2], input_channels))
return one_hot_reshaped
def _winners_take_all():
# Find the largest elements in each patch and set all other entries to zero (to find z_ijk+'s)
# Shape of max_elems: (batch_size, out_height, out_width, 1, 1, input_channels)
max_elems = tf.reshape(
current_tensor,
(batch_size, output_height, output_width, 1, 1, input_channels))
# Select maximum in each patch and set all others to zero
# Shape of zs: (batch_size, out_height, out_width, kernel_height, kernel_width, input_channels)
return tf.where(tf.equal(image_patches_reshaped, max_elems),
tf.ones_like(image_patches_reshaped),
tf.zeros_like(image_patches_reshaped))
def _distribute_relevances():
# Do nothing. This will distribute the relevance according to preactivations
return image_patches_reshaped
config = router.get_configuration(LAYER.MAX_POOLING)
if config.type == RULE.WINNERS_TAKE_ALL:
zs = _winners_take_all()
elif config.type == RULE.WINNER_TAKES_ALL:
zs = _winner_takes_all()
else:
zs = _distribute_relevances()
# Count how many zijs had the maximum value for each patch
denominator = tf.reduce_sum(zs, axis=[3, 4], keep_dims=True)
denominator = tf.where(tf.equal(denominator, 0), tf.ones_like(denominator),
denominator)
# Find the contribution of each feature in the input to the activations,
# i.e. the ratio between the z_ijk's and the z_jk's
# Shape of fractions: (batch_size, out_height, out_width, kernel_height, kernel_width, input_channels)
fractions = zs / denominator
# Add the predictions_per_sample dimension to be able to broadcast fractions over the different
# predictions for the same sample
# Shape after expand_dims:
# (batch_size, predictions_per_sample=1, out_height, out_width, kernel_height, kernel_width, input_channels)
fractions = tf.expand_dims(fractions, 1)
# Put the relevance for each patch in the dimension that corresponds to the "input_channel" dimension
# of the fractions
# Shape of R after reshape: (batch_size, predictions_per_sample, out_height, out_width, 1, 1, out_channels)
R_distributed = tf.reshape(R, [
batch_size, predictions_per_sample, output_height, output_width, 1, 1,
output_channels
])
# Distribute the relevance onto athe fractions
# Shape of new relevances: (batch_size, predictions_per_sample, out_height, out_width, kernel_height, kernel_width, input_channels)
relevances = fractions * R_distributed
# Put the batch size and predictions_per_sample on the same dimension to be able to use the patches_to_images tool.
# Also rearrange patches back to lists from the "small images".
# Shape of relevances after reshape:
# (batch_size * predictions_per_sample, out_height, out_width, kernel_height * kernel_width * input_channels)
relevances = tf.reshape(
relevances,
(batch_size_times_predictions_per_sample, output_height, output_width,
kernel_size[1] * kernel_size[2] * input_channels))
# Reconstruct the shape of the input, thereby summing the relevances for each individual feature
R_new = lrp_util.patches_to_images(
relevances, batch_size_times_predictions_per_sample, input_height,
input_width, input_channels, output_height, output_width,
kernel_size[1], kernel_size[2], strides[1], strides[2], padding)
# Reshape the relevances back to having batch_size and predictions_per_sample as the first two dimensions
# (batch_size, predictions_per_sample, input_height, input_width, input_channels) rather than
# (batch_size * predictions_per_sample, input_height, input_width, input_channels)
R_new = tf.reshape(R_new, (batch_size, predictions_per_sample,
input_height, input_width, input_channels))
# Report handled operations
router.mark_operation_handled(current_operation)
# Forward the calculated relevance to the input of the convolution
router.forward_relevance_to_operation(R_new, current_operation,
max_pool_input.op)
