data sample:

curves = 
    [[[ 163.73873901  163.79016113  195.15170288]
      [ 163.75410461  163.74798584  195.00090027]
      [ 163.82121277  163.3908844   193.4805603 ]
      ...
      [ 136.28196716  134.58721924    5.28508425]
      [ 136.14976501  134.63981628    5.04161263]
      [ 135.96887207  134.7321167     4.71693945]],
     ...
     [[ 163.73873901  163.79016113  195.15170288]
      [ 163.75410461  163.74798584  195.00090027]
      [ 163.82121277  163.3908844   193.4805603 ]
      ...
      [ 129.41056824  143.86738586  101.12477112]
      [ 129.30464172  143.82444763  100.86767578]
      [ 128.98980713  143.91737366  100.56091309]]]

The beginning of these curves overlap, and the points behind them are different.
It’s like a tree, all the curves go from the root to all the branches.

When I do this:

for curve in curves:
    x = curve[:, 0]
    y = curve[:, 1]
    z = curve[:, 2]
    tck, u = splprep([x,y,z], s=0) # scipy.interpolate.splprep
    unew = np.linspace(0, 1, 100)
    out = splev(unew, tck)
    ax.plot(out[0], out[1], out[2], label=f'B-spline Curve {idx+1}')

Result:
splprep return ValueError: Invalid inputs.

I know this is an error that occurs when the splprep function encounters points where the inputs are repeated (it’s ok to run splprep with a different curve alone), but the number of curves is unknown and I need ‘for’ to control the number of executions.
how to fix it? ty!