[英]“Matrix is not positive definite” error in scipy.cluster.vq.kmeans2
I am trying to perform kmeans clustering over 128-dimensional points (descriptors of interest points in an image). 我试图在128维点(图像中的兴趣点的描述符)上执行kmeans聚类。 When I use
scipy.cluster.vq.kmeans2
function, I sometimes get the following error: 当我使用
scipy.cluster.vq.kmeans2
函数时,我有时会收到以下错误:
File "main.py", line 21, in level_routine
current.centroids, current.labels = cluster.vq.kmeans2( current.descriptors, k)
File "/usr/lib/python2.7/dist-packages/scipy/cluster/vq.py", line 706, in kmeans2
clusters = init(data, k)
File "/usr/lib/python2.7/dist-packages/scipy/cluster/vq.py", line 593, in _krandinit
return init_rankn(data)
File "/usr/lib/python2.7/dist-packages/scipy/cluster/vq.py", line 586, in init_rankn
x = np.dot(x, np.linalg.cholesky(cov).T) + mu
File "/usr/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 603, in cholesky
return wrap(gufunc(a, signature=signature, extobj=extobj).astype(result_t))
File "/usr/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 93, in _raise_linalgerror_nonposdef
raise LinAlgError("Matrix is not positive definite")
numpy.linalg.linalg.LinAlgError: Matrix is not positive definite
I know that this has something to do with the random initialization because on the same data
and for the same k
, I sometimes do not get this error. 我知道这与随机初始化有关,因为在相同的
data
和相同的k
,我有时不会得到这个错误。
My data
is a numpy matrix with 128 columns and variable number of rows. 我的
data
是一个numpy矩阵,有128列和可变行数。 I am not constructing the co-variance matrix, and hence do not have control over the same. 我没有构建协方差矩阵,因此无法控制它。 Is there a way of getting rid of this error.
有没有办法摆脱这个错误。
尝试将minit参数更改为'points':
kmeans2(obs,k,minit='points')
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