docstr: Tests the code doesn't break when there's no proposals with IoU > 0.
          
docstr_tok: ["Tests","the","code","does","n't","break","when","there","'s","no","proposals","with","IoU",">","0","."]
code: def testAbsolutelyEmptyCase(self):
      """Tests the code doesn't break when there's no proposals with IoU > 0."""
  
      gt_boxes = tf.constant(
          [(40, 90, 100, 105, self._placeholder_label)],
          dtype=tf.float32,
      )
  
      proposed_boxes = tf.constant(
          [
              (0, 0, 39, 89),
              (101, 106, 300, 450),
              (340, 199, 410, 420),
          ],
          dtype=tf.float32,
      )
  
      (proposals_label, bbox_targets) = self._run_rcnn_target(
          self._shared_model, gt_boxes, proposed_boxes
      )
      foreground_fraction = self._config.foreground_fraction
      minibatch_size = self._config.minibatch_size
  
      foreground_number = proposals_label[proposals_label >= 1].shape[0]
      background_number = proposals_label[proposals_label == 0].shape[0]
  
      self.assertGreater(foreground_number, 0)
      self.assertLessEqual(
          foreground_number,
          np.floor(foreground_fraction * minibatch_size),
      )
      self.assertLessEqual(
          background_number, minibatch_size - foreground_number
      )
  
file_path: luminoth/luminoth/models/fasterrcnn/rcnn_target_test.py
imports: import numpy
  import tensorflow
  from easydict import EasyDict
  from luminoth.models.fasterrcnn.rcnn_target import RCNNTarget
  from luminoth.utils.test.gt_boxes import generate_gt_boxes
label_desc: Use image node_id 5 for calling the RCNNTargetTest obj's underlying member method code with example usage: obj.testAbsolutelyEmptyCase() without return types