import tensorflow as tf

          'conv17', conv16, filters=512, size=1, stride=1, bn=self.BN, act='lrelu')
      conv18 = self._conv_layer(
          'conv18', conv17, filters=1024, size=3, stride=1, bn=self.BN, act='lrelu')

    with tf.variable_scope('detector') as scope:
      conv19 = self._conv_layer(
          'conv19', conv18, filters=1024, size=3, stride=1, bn=self.BN, act='lrelu')
      conv20 = self._conv_layer(
