tensor([ 10.,  10.,  10.,  10.])
      >>> torch.lerp(start, end, 0.5)
      tensor([ 5.5000,  6.0000,  6.5000,  7.0000])
      >>> torch.lerp(start, end, torch.full_like(start, 0.5))
      tensor([ 5.5000,  6.0000,  6.5000,  7.0000])