Update coord.py#91
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the contraction function in current version may cause numerical instability in torch.pow(2*x_mag_sqrt - 1, 1/3), when 2*x_mag_sqrt - 1 < 0. According to the original paper, I revise it to ensure 2*x_mag_sqrt - 1 >= 1.
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the contraction function in current version may cause numerical instability in torch.pow(2x_mag_sqrt - 1, 1/3), when 2x_mag_sqrt - 1 < 0. According to the original paper (Eq. 14 in ZipNeRF), I revise it to ensure 2*x_mag_sqrt - 1 >= 1.