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Convert batches to float on GPU (inherited from PR 255) - #259
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PTDetector._process_batch_group() converted each batch to float32 and divided by 255 on the CPU, then copied it to the GPU. On CUDA devices, the uint8 tensor is now copied first: 4x fewer bytes, and a pass over every pixel moves off the CPU. The division uses a 0-dim tensor on the device rather than a Python float, because CUDA computes x / scalar as x * (1 / scalar), which differs from the CPU result in the last bit for 126 of the 256 pixel values; dividing by a device tensor gives exactly the CPU's float32 values. Other devices keep the existing code path. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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