Trilinear interpolation on a 3D regular grid.

grid_3d A tensor with shape [A1, ..., An, H, W, D, C] where H, W, D are height, width, depth of the grid and C is the number of channels.
sampling_points A tensor with shape [A1, ..., An, M, 3] where M is the number of sampling points. Sampling points outside the grid are projected in the grid borders.
name A name for this op that defaults to "trilinear_interpolate".

A tensor of shape [A1, ..., An, M, C]