Drop two no-op cpu() calls in the k-means cuda path - #2835
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Noticed this in the cuda branch of _cluster_weights_2d. Tensor.cpu() is not in place, so both calls build a copy and drop it while the originals stay on the device, and the assignment ten lines up shows the form that was meant. If freeing device memory before the return was the point, layerwise_compressor does it with del plus empty_cache, so you may want that here instead.