Grid_sample docs vs usage

In [SOLVED]Torch.grid_sample? - #2 by ptrblck the grid parameter of grid_sample appears to have the y, x order because grid = torch.stack((meshy, meshx), 2). But in the documentation, it says "the size-2 vector grid[n, h, w] specifies input pixel locations x and y". So is the grid order y, x or x, y? In other words, does grid[..., 0] sample along the height or the width of the image?