问题描述
我正在尝试使用稀疏矩阵来计算silhouette_score或silhouette_samples,但出现以下错误:
ValueError:diag需要至少二维的数组
示例代码如下:
edges = [
(1,2,0.9),(1,3,0.7),4,0.1),5,0),6,(2,0.8),0.2),0.3),(3,0.25),(4,0.6),(5,(7,8,1.0)]
gg = nx.Graph()
for u,v,w in edges:
gg.add_edge(u,weight=w)
adj = nx.adjacency_matrix(gg)
adj.setdiag(0)
from sklearn.metrics import silhouette_score,silhouette_samples
print(silhouette_score(adj,metric='precomputed',labels=labels))
silhouette_samples(adj,labels=labels)
解决方法
这是一个错误。您应该报告它。 Relevant code.
X,labels = check_X_y(X,labels,accept_sparse=['csc','csr'])
# Check for non-zero diagonal entries in precomputed distance matrix
if metric == 'precomputed':
atol = np.finfo(X.dtype).eps * 100
if np.any(np.abs(np.diagonal(X)) > atol):
raise ValueError(
'The precomputed distance matrix contains non-zero '
'elements on the diagonal. Use np.fill_diagonal(X,0).'
)
尽管输入检查明确接受CSC / CSR矩阵,但如果metric为'precomputed'
,则会将X放到不适用于稀疏矩阵的numpy函数中。