def hourglass_bulat(inputs, blocks, num_classes = 16, scope=None):
with tf.variable_scope(scope, 'resnet_v1', [inputs], reuse=reuse) as sc:
end_points_collection = sc.name + '_end_points'
with slim.arg_scope(resnet_utils.resnet_arg_scope(), outputs_collection=end_points_collection):
D0 = resnet_utils.conv2d_same(inputs, 64, 7, stride=2, scope='conv0')
D0 = bottleneck(net, 128, 64, 3)
D0 = slim.max_pool2d(net, [2, 2], stride=2, scope='pool0')
D0 = resnet_utils.stack_blocks_dense(D0, [blocks[0]])
skip0 = resnet_utils.stack_blocks_dense(D0, [blocks[1]])
D1 = slim.max_pool2d(D0, [2, 2], stride=2, scope='pool1')
D1 = resnet_utils.stack_blocks_dense(D1, [blocks[2]])
skip1 = resnet_utils.stack_blocks_dense(D1, [blocks[3]])
D2 = slim.max_pool2d(D1, [2, 2], stride=2, scope='pool2')
D2 = resnet_utils.stack_blocks_dense(D2, [blocks[4]])
skip2 = resnet_utils.stack_blocks_dense(D2, [blocks[5]])
D3 = slim.max_pool2d(D2, [2, 2], stride=2, scope='pool3')
D3 = resnet_utils.stack_blocks_dense(D3, [blocks[6]])
skip3 = resnet_utils.stack_blocks_dense(D3, [blocks[7]])
D4 = slim.max_pool2d(D3, [2, 2], stride=2, scope='pool4')
D4 = bottleneck(D4, 512, 256, 3)
D4 = slim.conv2d_transpose(D4, 512, [2,2], stride=2, scope='D4')
D4 = D4 + skip3
D5 = bottleneck(D4, 512, 256, 3)
D5 = slim.conv2d_transpose(D5, 512, [2,2], stride=2, scope='D5')
D5 = D5 + skip2
D6 = bottleneck(D5, 512, 256, 3)
D6 = slim.conv2d_transpose(D6, 512, [2,2], stride=2, scope='D6')
D6 = D6 + skip1
D7 = bottleneck(D6, 512, 256, 3)
D7 = slim.conv2d_transpose(D7, 512, [2,2], stride=2, scope='D7')
D7 = D7 + skip0
D8 = slim.conv2d(D7, 512, [1,1], stride=1, scope='D8')
D9 = slim.conv2d(D8, 256, [1,1], stride=1, scope='D9')
D10 = slim.conv2d(D9, num_classes, [1,1], stride=1, scope='logits')
D11 = slim.conv2d_transpose(D10, num_classes, [4, 4], stride=4, scope='logits_deconv')
# Convert end_points_collection into a dictionary of end_points.
end_points = slim.utils.convert_collection_to_dict(end_points_collection)
return D11, end_points
def bottleneck(inputs, depth, depth_bottleneck, stride, rate=1,
outputs_collections=None, scope=None):
"""Bottleneck residual unit variant with BN after convolutions.
This is the original residual unit proposed in [1]. See Fig. 1(a) of [2] for
its definition. Note that we use here the bottleneck variant which has an
extra bottleneck layer.
When putting together two consecutive ResNet blocks that use this unit, one
should use stride = 2 in the last unit of the first block.
Args:
inputs: A tensor of size [batch, height, width, channels].
depth: The depth of the ResNet unit output.
depth_bottleneck: The depth of the bottleneck layers.
stride: The ResNet unit's stride. Determines the amount of downsampling of
the units output compared to its input.
rate: An integer, rate for atrous convolution.
outputs_collections: Collection to add the ResNet unit output.
scope: Optional variable_scope.
Returns:
The ResNet unit's output.
"""
with tf.variable_scope(scope, 'bottleneck_v1', [inputs]) as sc:
depth_in = slim.utils.last_dimension(inputs.get_shape(), min_rank=4)
if depth == depth_in:
shortcut = resnet_utils.subsample(inputs, stride, 'shortcut')
else:
shortcut = slim.conv2d(inputs, depth, [1, 1], stride=stride,
activation_fn=None, scope='shortcut')
residual = slim.conv2d(inputs, depth_bottleneck, [1, 1], stride=1,
scope='conv1')
residual = resnet_utils.conv2d_same(residual, depth_bottleneck, 3, stride,
rate=rate, scope='conv2')
residual = slim.conv2d(residual, depth, [1, 1], stride=1,
activation_fn=None, scope='conv3')
output = tf.nn.relu(shortcut + residual)
return slim.utils.collect_named_outputs(outputs_collections,
sc.original_name_scope,
output)
def bulat_resnet_v1(inputs,
blocks,
num_classes=None,
is_training=True,
output_stride=None,
scope=None):
"""
"Blocks B1-B4 are the same as the ones in the original ResNet, and B5 was
slightly modified. We firstly removed both the fully connected layer after B5
and then the preceding average pooling layer. Then, we added a scoring
convolutional layer B6 with N outputs, one for each part. Next, to address
the extremely low output resolution, we firstly modified B5 by changing the
stride of its convolutional layers from 2px to 1px and then added (after B6)
a deconvolution layer B7 with a kernel size and stride of 4, that upsamples
the output layers to match the resolution
of the input."
"""
with tf.variable_scope(scope, 'resnet_v1', [inputs], reuse=None) as sc:
end_points_collection = sc.name + '_end_points'
with slim.arg_scope([slim.conv2d,
slim.conv2d_transpose,
bottleneck,
resnet_utils.stack_blocks_dense],
outputs_collections=end_points_collection):
with slim.arg_scope([slim.batch_norm], is_training=is_training):
net = inputs
net = resnet_utils.conv2d_same(net, 64, 7, stride=2, scope='conv1')
net = slim.max_pool2d(net, [3, 3], stride=2, scope='pool1')
c5 = resnet_utils.stack_blocks_dense(net, blocks, output_stride)
end_points = slim.utils.convert_collection_to_dict(end_points_collection)
logits = _construct_pyramid(c5,
end_points,
None,
num_classes,
sc.original_name_scope,
scope + '_pyramid')
end_points = slim.utils.convert_collection_to_dict(end_points_collection)
return logits, end_points
def resnet_v2(inputs,
blocks,
num_classes=None,
is_training=True,
global_pool=True,
output_stride=None,
include_root_block=True,
spatial_squeeze=True,
reuse=None,
scope=None):
"""Generator for v2 (preactivation) ResNet models.
This function generates a family of ResNet v2 models. See the resnet_v2_*()
methods for specific model instantiations, obtained by selecting different
block instantiations that produce ResNets of various depths.
Training for image classification on Imagenet is usually done with [224, 224]
inputs, resulting in [7, 7] feature maps at the output of the last ResNet
block for the ResNets defined in [1] that have nominal stride equal to 32.
However, for dense prediction tasks we advise that one uses inputs with
spatial dimensions that are multiples of 32 plus 1, e.g., [321, 321]. In
this case the feature maps at the ResNet output will have spatial shape
[(height - 1) / output_stride + 1, (width - 1) / output_stride + 1]
and corners exactly aligned with the input image corners, which greatly
facilitates alignment of the features to the image. Using as input [225, 225]
images results in [8, 8] feature maps at the output of the last ResNet block.
For dense prediction tasks, the ResNet needs to run in fully-convolutional
(FCN) mode and global_pool needs to be set to False. The ResNets in [1, 2] all
have nominal stride equal to 32 and a good choice in FCN mode is to use
output_stride=16 in order to increase the density of the computed features at
small computational and memory overhead, cf. http://arxiv.org/abs/1606.00915.
Args:
inputs: A tensor of size [batch, height_in, width_in, channels].
blocks: A list of length equal to the number of ResNet blocks. Each element
is a resnet_utils.Block object describing the units in the block.
num_classes: Number of predicted classes for classification tasks.
If 0 or None, we return the features before the logit layer.
is_training: whether batch_norm layers are in training mode.
global_pool: If True, we perform global average pooling before computing the
logits. Set to True for image classification, False for dense prediction.
output_stride: If None, then the output will be computed at the nominal
network stride. If output_stride is not None, it specifies the requested
ratio of input to output spatial resolution.
include_root_block: If True, include the initial convolution followed by
max-pooling, if False excludes it. If excluded, `inputs` should be the
results of an activation-less convolution.
spatial_squeeze: if True, logits is of shape [B, C], if false logits is
of shape [B, 1, 1, C], where B is batch_size and C is number of classes.
To use this parameter, the input images must be smaller than 300x300
pixels, in which case the output logit layer does not contain spatial
information and can be removed.
reuse: whether or not the network and its variables should be reused. To be
able to reuse 'scope' must be given.
scope: Optional variable_scope.
Returns:
net: A rank-4 tensor of size [batch, height_out, width_out, channels_out].
If global_pool is False, then height_out and width_out are reduced by a
factor of output_stride compared to the respective height_in and width_in,
else both height_out and width_out equal one. If num_classes is 0 or None,
then net is the output of the last ResNet block, potentially after global
average pooling. If num_classes is a non-zero integer, net contains the
pre-softmax activations.
end_points: A dictionary from components of the network to the corresponding
activation.
Raises:
ValueError: If the target output_stride is not valid.
"""
with tf.variable_scope(scope, 'resnet_v2', [inputs], reuse=reuse) as sc:
end_points_collection = sc.original_name_scope + '_end_points'
with slim.arg_scope(
[slim.conv2d, bottleneck, resnet_utils.stack_blocks_dense],
outputs_collections=end_points_collection):
with slim.arg_scope([slim.batch_norm], is_training=is_training):
net = inputs
if include_root_block:
if output_stride is not None:
if output_stride % 4 != 0:
raise ValueError(
'The output_stride needs to be a multiple of 4.'
)
output_stride /= 4
# We do not include batch normalization or activation functions in
# conv1 because the first ResNet unit will perform these. Cf.
# Appendix of [2].
with slim.arg_scope([slim.conv2d],
activation_fn=None,
normalizer_fn=None):
net = resnet_utils.conv2d_same(net,
64,
7,
stride=2,
scope='conv1')
net = slim.max_pool2d(net, [3, 3], stride=2, scope='pool1')
net = resnet_utils.stack_blocks_dense(net, blocks,
output_stride)
# This is needed because the pre-activation variant does not have batch
# normalization or activation functions in the residual unit output. See
# Appendix of [2].
net = slim.batch_norm(net,
activation_fn=tf.nn.relu,
scope='postnorm')
# Convert end_points_collection into a dictionary of end_points.
end_points = slim.utils.convert_collection_to_dict(
end_points_collection)
if global_pool:
# Global average pooling.
net = tf.reduce_mean(net, [1, 2],
name='pool5',
keep_dims=True)
end_points['global_pool'] = net
if num_classes:
net = slim.conv2d(net,
num_classes, [1, 1],
activation_fn=None,
normalizer_fn=None,
scope='logits')
end_points[sc.name + '/logits'] = net
if spatial_squeeze:
net = tf.squeeze(net, [1, 2], name='SpatialSqueeze')
end_points[sc.name + '/spatial_squeeze'] = net
end_points['predictions'] = slim.softmax(
net, scope='predictions')
return net, end_points