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Computes the normalized pixel coordinates for the specified image size.

The x-coordinates will range from -1 to 1 left to right. The y-coordinates will range from -1 to 1 top to bottom. The extrema +-1 will fall onto the exterior pixel boundaries, while the coordinates will be evaluated at pixel centers. So, image of width 4 will have normalized pixel x-coordinates at [-0.75 -0.25 0.25 0.75], while image of width 3 will have them at [-0.667 0 0.667].

image_width int specifying desired output image width in pixels.
image_height int specifying desired output image height in pixels.

Two float32 tensors with shape [image_height, image_width] containing x- and y- coordinates, respecively, for each image pixel.