Segmentation fault (core dumped)

Describe the bug

Test SPTag wrapper on python 2.7, ubuntu 18.04
TRY x is FLOAT data. Got error Segmentation fault (core dumped)

import SPTAG
import numpy as np

n = 100
k = 3
r = 3

def testBuild(algo, distmethod, x, out):
    i = SPTAG.AnnIndex(algo, 'Float', x.shape[1])
    i.SetBuildParam("NumberOfThreads", '4')
    i.SetBuildParam("DistCalcMethod", distmethod)
    ret = i.Build(x.tobytes(), x.shape[0])
    i.Save(out)

def testSearch(index, q, k):
    j = SPTAG.AnnIndex.Load(index)
    for t in range(q.shape[0]):
        result = j.Search(q[t].tobytes(), k)
        print(result[0])  # ids
        print(result[1])  # distances

def Test(algo, distmethod):
    x = np.ones((n, 10), dtype=np.float32) * np.reshape(np.random.uniform(low=0.5, high=13.3, size=(n,)), (n,1))

    print('x.shape: ', str(x.shape))
    print(x[1,])

    print("Build.............................")
    testBuild(algo, distmethod, x, 'testindices')
    testSearch('testindices', q, k)

if __name__ == '__main__':
    Test('BKT', 'L2')
    # Test('KDT', 'L2')

Log console:

('x.shape: ', '(100, 10)')
[ 0.60697413 0.60697413 0.60697413 0.60697413 0.60697413 0.60697413
0.60697413 0.60697413 0.60697413 0.60697413]
Build.............................
Setting NumberOfThreads with value 4
Setting DistCalcMethod with value L2
Save Data To testindices/vectors.bin
Save Data (0, 1) Finish!
Save BKT to testindices/tree.bin
Segmentation fault (core dumped)