sleap.nn.data.offset_regression#
Utilities for creating offset regression maps.
- sleap.nn.data.offset_regression.make_offsets(points: tensorflow.python.framework.ops.Tensor, xv: tensorflow.python.framework.ops.Tensor, yv: tensorflow.python.framework.ops.Tensor, stride: int = 1) tensorflow.python.framework.ops.Tensor [source]#
Make point offset maps on a grid.
- Parameters
points – Point locations as a
tf.Tensor
of shape(n_points, 2)
and dtypetf.float32
where each row specifies the x- and y-coordinates of the map centers. Each point will generate a different map.xv – Sampling grid vector for x-coordinates of shape
(grid_width,)
and dtype tf.float32. This can be generated bysleap.nn.data.utils.make_grid_vectors
.yv – Sampling grid vector for y-coordinates of shape
(grid_height,)
and dtype tf.float32. This can be generated bysleap.nn.data.utils.make_grid_vectors
.stride – Scaling factor for offset coordinates. The individual offset vectors will be divided by this value. Useful for adjusting for strided sampling grids so that the offsets point to the smaller grid coordinates.
- Returns
The offset maps as a
tf.Tensor
of shape(grid_height, grid_width, n_points, 2)
and dtypetf.float32
. The last axis corresponds to the x- and y-offsets at each grid point for each input point.
See also
sleap.nn.data.utils.make_grid_vectors
- sleap.nn.data.offset_regression.mask_offsets(offsets: tensorflow.python.framework.ops.Tensor, confmaps: tensorflow.python.framework.ops.Tensor, threshold: float = 0.2) tensorflow.python.framework.ops.Tensor [source]#
Mask offset maps using a confidence map threshold.
This is useful for restricting offset maps to local neighborhoods around the peaks.
- Parameters
offsets – A set of offset maps as a
tf.Tensor
of shape(grid_height, grid_width, n_points, 2)
and dtypetf.float32
. This can be generated bymake_offsets
.confmaps – Confidence maps for the same points as the offset maps as a
tf.Tensor
of shape(grid_height, grid_width, n_points)
and dtypetf.float32
. This can be generated bysleap.nn.data.confidence_maps.make_confmaps
.threshold – Minimum confidence map value below which offsets will be replaced with zeros.
- Returns
The offset maps with the same shape as the inputs but with zeros where the confidence maps are below the specified threshold.
See also: make_offsets, sleap.nn.data.confidence_maps.make_confmaps