Ejemplo n.º 1
0
    def testConv2DSameOdd(self):
        n, n2 = 5, 3

        # Input image.
        x = create_test_input(1, n, n, 1)

        # Convolution kernel.
        w = create_test_input(1, 3, 3, 1)
        w = tf.reshape(w, [3, 3, 1, 1])

        tf.get_variable('Conv/weights', initializer=w)
        tf.get_variable('Conv/biases', initializer=tf.zeros([1]))
        tf.get_variable_scope().reuse_variables()

        y1 = slim.conv2d(x, 1, [3, 3], stride=1, scope='Conv')
        y1_expected = tf.to_float([[14, 28, 43, 58, 34], [28, 48, 66, 84, 46],
                                   [43, 66, 84, 102,
                                    55], [58, 84, 102, 120, 64],
                                   [34, 46, 55, 64, 30]])
        y1_expected = tf.reshape(y1_expected, [1, n, n, 1])

        y2 = resnet_utils.subsample(y1, 2)
        y2_expected = tf.to_float([[14, 43, 34], [43, 84, 55], [34, 55, 30]])
        y2_expected = tf.reshape(y2_expected, [1, n2, n2, 1])

        y3 = resnet_utils.conv2d_same(x, 1, 3, stride=2, scope='Conv')
        y3_expected = y2_expected

        y4 = slim.conv2d(x, 1, [3, 3], stride=2, scope='Conv')
        y4_expected = y2_expected

        with self.test_session() as sess:
            sess.run(tf.global_variables_initializer())
            self.assertAllClose(y1.eval(), y1_expected.eval())
            self.assertAllClose(y2.eval(), y2_expected.eval())
            self.assertAllClose(y3.eval(), y3_expected.eval())
            self.assertAllClose(y4.eval(), y4_expected.eval())
Ejemplo n.º 2
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def resnet_v1(inputs,
              blocks,
              num_classes=None,
              is_training=True,
              global_pool=True,
              output_stride=None,
              include_root_block=True,
              spatial_squeeze=True,
              store_non_strided_activations=False,
              reuse=None,
              scope=None):
    """Generator for v1 ResNet models.

  This function generates a family of ResNet v1 models. See the resnet_v1_*()
  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. If this is set
      to None, the callers can specify slim.batch_norm's is_training parameter
      from an outer slim.arg_scope.
    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.
    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.
    store_non_strided_activations: If True, we compute non-strided (undecimated)
      activations at the last unit of each block and store them in the
      `outputs_collections` before subsampling them. This gives us access to
      higher resolution intermediate activations which are useful in some
      dense prediction problems but increases 4x the computation and memory cost
      at the last unit of each block.
    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 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_v1', [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)
                  if is_training is not None else NoOpScope()):
                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
                    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, store_non_strided_activations)
                # 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
Ejemplo n.º 3
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def bottleneck(inputs,
               depth,
               depth_bottleneck,
               stride,
               rate=1,
               outputs_collections=None,
               scope=None,
               use_bounded_activations=False):
    """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.
    use_bounded_activations: Whether or not to use bounded activations. Bounded
      activations better lend themselves to quantized inference.

  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=tf.nn.relu6 if use_bounded_activations else 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')

        if use_bounded_activations:
            # Use clip_by_value to simulate bandpass activation.
            residual = tf.clip_by_value(residual, -6.0, 6.0)
            output = tf.nn.relu6(shortcut + residual)
        else:
            output = tf.nn.relu(shortcut + residual)

        return slim.utils.collect_named_outputs(outputs_collections, sc.name,
                                                output)
Ejemplo n.º 4
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def bottleneck(inputs,
               depth,
               depth_bottleneck,
               stride,
               rate=1,
               outputs_collections=None,
               scope=None):
    """Bottleneck residual unit variant with BN before convolutions.

  This is the full preactivation residual unit variant proposed in [2]. See
  Fig. 1(b) 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_v2', [inputs]) as sc:
        depth_in = slim.utils.last_dimension(inputs.get_shape(), min_rank=4)
        preact = slim.batch_norm(inputs,
                                 activation_fn=tf.nn.relu,
                                 scope='preact')
        if depth == depth_in:
            shortcut = resnet_utils.subsample(inputs, stride, 'shortcut')
        else:
            shortcut = slim.conv2d(preact,
                                   depth, [1, 1],
                                   stride=stride,
                                   normalizer_fn=None,
                                   activation_fn=None,
                                   scope='shortcut')

        residual = slim.conv2d(preact,
                               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,
                               normalizer_fn=None,
                               activation_fn=None,
                               scope='conv3')

        output = shortcut + residual

        return slim.utils.collect_named_outputs(outputs_collections, sc.name,
                                                output)