Python losses.SigmoidFocalClassificationLoss方法代碼示例

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testHardExamplesProduceLossComparableToSigmoidXEntropy(self):
    prediction_tensor = tf.constant([[[_logit(0.55)],
                                      [_logit(0.52)],
                                      [_logit(0.50)],
                                      [_logit(0.48)],
                                      [_logit(0.45)]]], tf.float32)
    target_tensor = tf.constant([[[1],
                                  [1],
                                  [1],
                                  [0],
                                  [0]]], tf.float32)
    weights = tf.constant([[[1], [1], [1], [1], [1]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(gamma=2.0, alpha=None)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights), axis=2)
    sigmoid_loss = tf.reduce_sum(sigmoid_loss_op(prediction_tensor,
                                                 target_tensor,
                                                 weights=weights), axis=2)

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      order_of_ratio = np.power(10,
                                np.floor(np.log10(sigmoid_loss / focal_loss)))
      self.assertAllClose(order_of_ratio, [[1., 1., 1., 1., 1.]]) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testNonAnchorWiseOutputComparableToSigmoidXEntropy(self):
    prediction_tensor = tf.constant([[[_logit(0.55)],
                                      [_logit(0.52)],
                                      [_logit(0.50)],
                                      [_logit(0.48)],
                                      [_logit(0.45)]]], tf.float32)
    target_tensor = tf.constant([[[1],
                                  [1],
                                  [1],
                                  [0],
                                  [0]]], tf.float32)
    weights = tf.constant([[[1], [1], [1], [1], [1]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(gamma=2.0, alpha=None)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights))
    sigmoid_loss = tf.reduce_sum(sigmoid_loss_op(prediction_tensor,
                                                 target_tensor,
                                                 weights=weights))

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      order_of_ratio = np.power(10,
                                np.floor(np.log10(sigmoid_loss / focal_loss)))
      self.assertAlmostEqual(order_of_ratio, 1.) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def test_build_weighted_sigmoid_focal_classification_loss(self):
    losses_text_proto = """
      classification_loss {
        weighted_sigmoid_focal {
        }
      }
      localization_loss {
        weighted_l2 {
        }
      }
    """
    losses_proto = losses_pb2.Loss()
    text_format.Merge(losses_text_proto, losses_proto)
    classification_loss, _, _, _, _, _ = losses_builder.build(losses_proto)
    self.assertTrue(isinstance(classification_loss,
                               losses.SigmoidFocalClassificationLoss))
    self.assertAlmostEqual(classification_loss._alpha, None)
    self.assertAlmostEqual(classification_loss._gamma, 2.0) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def test_build_weighted_sigmoid_focal_loss_non_default(self):
    losses_text_proto = """
      classification_loss {
        weighted_sigmoid_focal {
          alpha: 0.25
          gamma: 3.0
        }
      }
      localization_loss {
        weighted_l2 {
        }
      }
    """
    losses_proto = losses_pb2.Loss()
    text_format.Merge(losses_text_proto, losses_proto)
    classification_loss, _, _, _, _, _ = losses_builder.build(losses_proto)
    self.assertTrue(isinstance(classification_loss,
                               losses.SigmoidFocalClassificationLoss))
    self.assertAlmostEqual(classification_loss._alpha, 0.25)
    self.assertAlmostEqual(classification_loss._gamma, 3.0) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testHardExamplesProduceLossComparableToSigmoidXEntropy(self):
    prediction_tensor = tf.constant([[[_logit(0.55)],
                                      [_logit(0.52)],
                                      [_logit(0.50)],
                                      [_logit(0.48)],
                                      [_logit(0.45)]]], tf.float32)
    target_tensor = tf.constant([[[1],
                                  [1],
                                  [1],
                                  [0],
                                  [0]]], tf.float32)
    weights = tf.constant([[1, 1, 1, 1, 1]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(gamma=2.0, alpha=None)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights), axis=2)
    sigmoid_loss = tf.reduce_sum(sigmoid_loss_op(prediction_tensor,
                                                 target_tensor,
                                                 weights=weights), axis=2)

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      order_of_ratio = np.power(10,
                                np.floor(np.log10(sigmoid_loss / focal_loss)))
      self.assertAllClose(order_of_ratio, [[1., 1., 1., 1., 1.]]) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testNonAnchorWiseOutputComparableToSigmoidXEntropy(self):
    prediction_tensor = tf.constant([[[_logit(0.55)],
                                      [_logit(0.52)],
                                      [_logit(0.50)],
                                      [_logit(0.48)],
                                      [_logit(0.45)]]], tf.float32)
    target_tensor = tf.constant([[[1],
                                  [1],
                                  [1],
                                  [0],
                                  [0]]], tf.float32)
    weights = tf.constant([[1, 1, 1, 1, 1]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(gamma=2.0, alpha=None)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights))
    sigmoid_loss = tf.reduce_sum(sigmoid_loss_op(prediction_tensor,
                                                 target_tensor,
                                                 weights=weights))

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      order_of_ratio = np.power(10,
                                np.floor(np.log10(sigmoid_loss / focal_loss)))
      self.assertAlmostEqual(order_of_ratio, 1.) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def test_build_weighted_sigmoid_focal_classification_loss(self):
    losses_text_proto = """
      classification_loss {
        weighted_sigmoid_focal {
        }
      }
      localization_loss {
        weighted_l2 {
        }
      }
    """
    losses_proto = losses_pb2.Loss()
    text_format.Merge(losses_text_proto, losses_proto)
    classification_loss, _, _, _, _ = losses_builder.build(losses_proto)
    self.assertTrue(isinstance(classification_loss,
                               losses.SigmoidFocalClassificationLoss))
    self.assertAlmostEqual(classification_loss._alpha, None)
    self.assertAlmostEqual(classification_loss._gamma, 2.0) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testEasyExamplesProduceSmallLossComparedToSigmoidXEntropy(self):
    prediction_tensor = tf.constant([[[_logit(0.97)],
                                      [_logit(0.91)],
                                      [_logit(0.73)],
                                      [_logit(0.27)],
                                      [_logit(0.09)],
                                      [_logit(0.03)]]], tf.float32)
    target_tensor = tf.constant([[[1],
                                  [1],
                                  [1],
                                  [0],
                                  [0],
                                  [0]]], tf.float32)
    weights = tf.constant([[[1], [1], [1], [1], [1], [1]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(gamma=2.0, alpha=None)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights), axis=2)
    sigmoid_loss = tf.reduce_sum(sigmoid_loss_op(prediction_tensor,
                                                 target_tensor,
                                                 weights=weights), axis=2)

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      order_of_ratio = np.power(10,
                                np.floor(np.log10(sigmoid_loss / focal_loss)))
      self.assertAllClose(order_of_ratio, [[1000, 100, 10, 10, 100, 1000]]) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testIgnoreNegativeExampleLossViaAlphaMultiplier(self):
    prediction_tensor = tf.constant([[[_logit(0.55)],
                                      [_logit(0.52)],
                                      [_logit(0.50)],
                                      [_logit(0.48)],
                                      [_logit(0.45)]]], tf.float32)
    target_tensor = tf.constant([[[1],
                                  [1],
                                  [1],
                                  [0],
                                  [0]]], tf.float32)
    weights = tf.constant([[[1], [1], [1], [1], [1]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(gamma=2.0, alpha=1.0)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights), axis=2)
    sigmoid_loss = tf.reduce_sum(sigmoid_loss_op(prediction_tensor,
                                                 target_tensor,
                                                 weights=weights), axis=2)

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      self.assertAllClose(focal_loss[0][3:], [0., 0.])
      order_of_ratio = np.power(10,
                                np.floor(np.log10(sigmoid_loss[0][:3] /
                                                  focal_loss[0][:3])))
      self.assertAllClose(order_of_ratio, [1., 1., 1.]) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testIgnorePositiveExampleLossViaAlphaMultiplier(self):
    prediction_tensor = tf.constant([[[_logit(0.55)],
                                      [_logit(0.52)],
                                      [_logit(0.50)],
                                      [_logit(0.48)],
                                      [_logit(0.45)]]], tf.float32)
    target_tensor = tf.constant([[[1],
                                  [1],
                                  [1],
                                  [0],
                                  [0]]], tf.float32)
    weights = tf.constant([[[1], [1], [1], [1], [1]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(gamma=2.0, alpha=0.0)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights), axis=2)
    sigmoid_loss = tf.reduce_sum(sigmoid_loss_op(prediction_tensor,
                                                 target_tensor,
                                                 weights=weights), axis=2)

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      self.assertAllClose(focal_loss[0][:3], [0., 0., 0.])
      order_of_ratio = np.power(10,
                                np.floor(np.log10(sigmoid_loss[0][3:] /
                                                  focal_loss[0][3:])))
      self.assertAllClose(order_of_ratio, [1., 1.]) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testSameAsSigmoidXEntropyWithNoAlphaAndZeroGamma(self):
    prediction_tensor = tf.constant([[[-100, 100, -100],
                                      [100, -100, -100],
                                      [100, 0, -100],
                                      [-100, -100, 100]],
                                     [[-100, 0, 100],
                                      [-100, 100, -100],
                                      [100, 100, 100],
                                      [0, 0, -1]]], tf.float32)
    target_tensor = tf.constant([[[0, 1, 0],
                                  [1, 0, 0],
                                  [1, 0, 0],
                                  [0, 0, 1]],
                                 [[0, 0, 1],
                                  [0, 1, 0],
                                  [1, 1, 1],
                                  [1, 0, 0]]], tf.float32)
    weights = tf.constant([[[1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1]],
                           [[1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1],
                            [0, 0, 0]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(alpha=None, gamma=0.0)
    sigmoid_loss_op = losses.WeightedSigmoidClassificationLoss()
    focal_loss = focal_loss_op(prediction_tensor, target_tensor,
                               weights=weights)
    sigmoid_loss = sigmoid_loss_op(prediction_tensor, target_tensor,
                                   weights=weights)

    with self.test_session() as sess:
      sigmoid_loss, focal_loss = sess.run([sigmoid_loss, focal_loss])
      self.assertAllClose(sigmoid_loss, focal_loss) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testExpectedLossWithAlphaOneAndZeroGamma(self):
    # All zeros correspond to 0.5 probability.
    prediction_tensor = tf.constant([[[0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0]],
                                     [[0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0]]], tf.float32)
    target_tensor = tf.constant([[[0, 1, 0],
                                  [1, 0, 0],
                                  [1, 0, 0],
                                  [0, 0, 1]],
                                 [[0, 0, 1],
                                  [0, 1, 0],
                                  [1, 0, 0],
                                  [1, 0, 0]]], tf.float32)
    weights = tf.constant([[[1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1]],
                           [[1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(alpha=1.0, gamma=0.0)

    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights))
    with self.test_session() as sess:
      focal_loss = sess.run(focal_loss)
      self.assertAllClose(
          (-math.log(.5) *  # x-entropy per class per anchor
           1.0 *            # alpha
           8),              # positives from 8 anchors
          focal_loss) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def testExpectedLossWithAlpha75AndZeroGamma(self):
    # All zeros correspond to 0.5 probability.
    prediction_tensor = tf.constant([[[0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0]],
                                     [[0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0],
                                      [0, 0, 0]]], tf.float32)
    target_tensor = tf.constant([[[0, 1, 0],
                                  [1, 0, 0],
                                  [1, 0, 0],
                                  [0, 0, 1]],
                                 [[0, 0, 1],
                                  [0, 1, 0],
                                  [1, 0, 0],
                                  [1, 0, 0]]], tf.float32)
    weights = tf.constant([[[1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1]],
                           [[1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1],
                            [1, 1, 1]]], tf.float32)
    focal_loss_op = losses.SigmoidFocalClassificationLoss(alpha=0.75, gamma=0.0)

    focal_loss = tf.reduce_sum(focal_loss_op(prediction_tensor, target_tensor,
                                             weights=weights))
    with self.test_session() as sess:
      focal_loss = sess.run(focal_loss)
      self.assertAllClose(
          (-math.log(.5) *  # x-entropy per class per anchor.
           ((0.75 *         # alpha for positives.
             8) +           # positives from 8 anchors.
            (0.25 *         # alpha for negatives.
             8 * 2))),      # negatives from 8 anchors for two classes.
          focal_loss) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def build_faster_rcnn_classification_loss(loss_config):
  """Builds a classification loss for Faster RCNN based on the loss config.

  Args:
    loss_config: A losses_pb2.ClassificationLoss object.

  Returns:
    Loss based on the config.

  Raises:
    ValueError: On invalid loss_config.
  """
  if not isinstance(loss_config, losses_pb2.ClassificationLoss):
    raise ValueError('loss_config not of type losses_pb2.ClassificationLoss.')

  loss_type = loss_config.WhichOneof('classification_loss')

  if loss_type == 'weighted_sigmoid':
    return losses.WeightedSigmoidClassificationLoss()
  if loss_type == 'weighted_softmax':
    config = loss_config.weighted_softmax
    return losses.WeightedSoftmaxClassificationLoss(
        logit_scale=config.logit_scale)
  if loss_type == 'weighted_logits_softmax':
    config = loss_config.weighted_logits_softmax
    return losses.WeightedSoftmaxClassificationAgainstLogitsLoss(
        logit_scale=config.logit_scale)
  if loss_type == 'weighted_sigmoid_focal':
    config = loss_config.weighted_sigmoid_focal
    alpha = None
    if config.HasField('alpha'):
      alpha = config.alpha
    return losses.SigmoidFocalClassificationLoss(
        gamma=config.gamma,
        alpha=alpha)

  # By default, Faster RCNN second stage classifier uses Softmax loss
  # with anchor-wise outputs.
  config = loss_config.weighted_softmax
  return losses.WeightedSoftmaxClassificationLoss(
      logit_scale=config.logit_scale) 

# 需要導入模塊: from object_detection.core import losses [as 別名]
# 或者: from object_detection.core.losses import SigmoidFocalClassificationLoss [as 別名]
def test_build_sigmoid_focal_loss(self):
    losses_text_proto = """
      weighted_sigmoid_focal {
      }
    """
    losses_proto = losses_pb2.ClassificationLoss()
    text_format.Merge(losses_text_proto, losses_proto)
    classification_loss = losses_builder.build_faster_rcnn_classification_loss(
        losses_proto)
    self.assertTrue(
        isinstance(classification_loss,
                   losses.SigmoidFocalClassificationLoss))