def test_gather_with_invalid_field_specified(self):
indices = np.array([2, 0, 1], dtype=int)
boxlist = self.boxlist
with self.assertRaises(ValueError):
np_box_list_ops.gather(boxlist, indices, 'labels')
with self.assertRaises(ValueError):
np_box_list_ops.gather(boxlist, indices, ['objectness'])
def gather(box_mask_list, indices, fields=None):
"""Gather boxes from np_box_mask_list.BoxMaskList according to indices.
By default, gather returns boxes corresponding to the input index list, as
well as all additional fields stored in the box_mask_list (indexing into the
first dimension). However one can optionally only gather from a
subset of fields.
Args:
box_mask_list: np_box_mask_list.BoxMaskList holding N boxes
indices: a 1-d numpy array of type int_
fields: (optional) list of fields to also gather from. If None (default),
all fields are gathered from. Pass an empty fields list to only gather
the box coordinates.
Returns:
subbox_mask_list: a np_box_mask_list.BoxMaskList corresponding to the subset
of the input box_mask_list specified by indices
Raises:
ValueError: if specified field is not contained in box_mask_list or if the
indices are not of type int_
"""
if fields is not None:
if 'masks' not in fields:
fields.append('masks')
return box_list_to_box_mask_list(
np_box_list_ops.gather(boxlist=box_mask_list,
indices=indices,
fields=fields))
def test_gather_with_fields_specified(self):
indices = np.array([2, 0, 1], dtype=int)
boxlist = self.boxlist
subboxlist = np_box_list_ops.gather(boxlist, indices, ['labels'])
self.assertFalse(subboxlist.has_field('scores'))
expected_boxes = np.array(
[[0.0, 0.0, 20.0, 20.0], [3.0, 4.0, 6.0, 8.0],
[14.0, 14.0, 15.0, 15.0]],
dtype=float)
self.assertAllClose(expected_boxes, subboxlist.get())
expected_labels = np.array(
[[0, 0, 0, 0, 1], [0, 0, 0, 1, 0], [0, 1, 0, 0, 0]], dtype=int)
self.assertAllClose(expected_labels, subboxlist.get_field('labels'))
def test_gather_with_invalid_multidimensional_indices(self):
indices = np.array([[0, 1], [1, 2]], dtype=int)
boxlist = self.boxlist
with self.assertRaises(ValueError):
np_box_list_ops.gather(boxlist, indices)
def test_gather_with_out_of_range_indices(self):
indices = np.array([3, 1], dtype=int)
boxlist = self.boxlist
with self.assertRaises(ValueError):
np_box_list_ops.gather(boxlist, indices)